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HP 8591C Скачать руководство пользователя страница 50

Channel Measurements

Making Channel Measurements

If GATING YES NO is set to YES, upon executing the carrier-to-noise or
CSO measurements, the analyzer automatically searches for a quiet line (a
line with no video modulation) starting at the default line.

N O T E

The default quiet line number for carrier-to-noise and CSO is 12, and both fields. The default line

number for the in-channel frequency response test is 19, and both fields. For differential gain,
differential phase, and

delay inequality, the default test signal line number is 18, and the

field is odd.

If the analyzer Ends a quiet line, and if PAUSE YES NO is set to NO, the
analyzer will automatically execute the measurement without requiring
the channel’s video modulation to be turned off (non-interfering). If

PAUSE YES NO is set to YES, the analyzer will pause upon Ending a quiet

line. At this point, if a quiet line is displayed, press CONTINUE to execute
the measurement. If a quiet line was not found, you must search for it
using the

(step up) and

(step down) keys.

If GATING YES NO is set to NO, upon executing the carrier-to-noise
or CSO measurements, you will be prompted to turn off modulation to
execute the measurement in an interfering manner.

7.

analyzers with Option 107:

Press PAUSE YES NO to select between

pausing (YES) before executing a gated (non-interfering) or video
measurement, or, upon Ending a quiet line or test signal, execute the
measurement immediately (NO).

This function applies to carrier-to-noise and CSO when performing

these measurements in a gated (non-interfering) manner. This function
also applies to the video measurements: differential gain, differential
phase, and

delay inequality. When executing the video

measurements, the analyzer automatically searches for the appropriate test
signal. Refer to each test’s description to see how each test operates.

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Содержание 8591C

Страница 1: ...ackard company brand name The brand name has now been changed to Agilent Technologies The two products are functionally identical only our name has changed The document still includes references to Hewlett Packard products some of which have been transitioned to Agilent Technologies Advanced Test Equipment Rentals www atecorp com 800 404 ATEC 2832 Established 1981 ...

Страница 2: ...I User s Guide HP 8591C Cable TV Analyzer Cable TV Measurements ...

Страница 3: ...ticular purpose Hewlett Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material Regulatory Information The regulatory information is in the calibration guide for your analyzer acopyright 1996 Hewlett Packard Company All Rights Reserved Reproduction adaptation or translation without prio...

Страница 4: ...rating the equipment Rights in the software are offered only on the condition that the Customer agrees to all terms and conditions of the License Agreement Opening the media envelope or operating the equipment indicates your acceptance of these terms and conditions If you do not agree to the License Agreement you may return the unopened package for a full refund 111 ...

Страница 5: ...hich is available from Hewlett Packard for some software l Customer agrees that no warranty free installation or free training is provided by Hewlett Packard for any copies or adaptations made by Customer l All copies and adaptations of the software must bear the copyright notices s contained in or on the original Ownership l Customer agrees that they do not have any title or ownership of the soft...

Страница 6: ...red by Hewlett Packard Sublicensing and Distribution l Customer may not sublicense the software or distribute copies or adaptations of the software to the public in physical media or by telecommunication without the prior written consent of Hewlett Packard Termination l Hewlett Packard may terminate this software license for failure to comply with any of these terms provided Hewlett Packard has re...

Страница 7: ...is recorded to be free from defects in materials and workmanship under normal use for a period of 1 year from the date of purchase In the event any media prove to be defective during the warranty period Customer s remedy shall be to return the media to Hewlett Packard for replacement Should Hewlett Packard be unable to replace the media within a reasonable amount of time Customer s alternate remed...

Страница 8: ...liable for any direct indirect special incidental or consequential damages including lost profit whether based on warranty contract tort or any other legal theory Warranty Service Warranty service may be obtained from the nearest Hewlett Packard sales office or other location indicated in the owner s manual or service booklet vii ...

Страница 9: ... not correctly performed or adhered to could result in damage to or destruction of the instrument Do not proceed beyond a caution sign until the indicated conditions are fully understood and met WARNING The warning sign denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning sign until ...

Страница 10: ...interruption of the protective grounding conductor inside or outside the instrument or disconnection of the protective earth terminal can result in personal injury CAUTION Before the analyzer is switched on make sure its primary power circuitry has been adapted to the voltage of the ac power source Failure to set the ac power input to the correct voltage could cause damage to the instrument when t...

Страница 11: ...ation of an analog display l Peak zoom l Title execute remote commands and edit DLPs with a PC keyboard l Adjacent channel power occupied BW and channel power l Multiple markers and marker table l Peak table l AM TOI and N dB bandwidth l AM measurements with FFT menu l Gate driver Option 105 or 107 required 2 The HP 85721A with supported analyzer is a cable TV analyzer With the Option 107 added th...

Страница 12: ...or all measurements on a selected channel or range of channels After setting up these test plans system measurement mode is used to execute a test plan immediately or schedule the tests to be performed at a later tune Measurement results can be stored to a RAM card sent to the screen for viewing or dumped to a printer 3 The HP 85721A with supported analyzer is a TV receiver Option 107 required You...

Страница 13: ...ovided l Chapter 4 contains information about what to do if you have a problem l Chapter 5 contains menu maps and descriptions of softkey functions in the channel measurement mode l Chapter 6 contains menu maps and descriptions of softkey functions in the system measurement mode l Chapter 7 contains menu maps and descriptions of softkey functions in the Setup menu l Chapter 8 provides descriptions...

Страница 14: ...oftkey a key whose label is determined by the instrument s firmware A boxed word written in this typeface with the words ON and OFF can turn a function on or off The underlined function is shown in parenthesis A boxed word written in this typeface with the words AUTO and MAN can either be auto coupled or have its value manually changed The underlined function is shown in parenthesis Text printed i...

Страница 15: ... firmware that was released on September 23 1993 or later to use the HP 85721A personality To determine the firmware date for your analyzer l Turn on the analyzer l Read the firmware date that is displayed the firmware date is displayed on the analyzer s display when the analyzer is first turned on The date is displayed in a day month year format For example if rev 930923 is displayed the release ...

Страница 16: ...Connect the signal to the analyzer Step 3 Make the measurements Method l Tune by center frequency and frequency span Method 2 Tune by start and stop frequencies Step 4 Access the spectrum analyzer mode Step 5 Access the TV receiver mode optional 3 System Measurements What You ll Find in This Chapter Making System Measurements Step 1 Configure the test system Step 2 Connect the signal to the analyz...

Страница 17: ...4 If You Have a Problem Error Messages ALREADYENTERED CAUTION RecalledTest Plan Corrupted SelectedTest PlanCleared CAUTION STOPTIME ALREADYPASSED CAUTION STOPTIME LESS THAN STARTTIME SET STOP TIMEANDTRYAGAIN CHECK CARD IN SLOT SAVE OFF ILLEGAL COMMAND INVALID SYMTAB ENTRY SYMTAB OVERFLOW INVALID FILENO ROOM MUSTBE FIRST NO CARD FOUND NO TEST PLAN SELECTED OUTOFRANGE PLEASE SELECT A CHANNEL PRINTER...

Страница 18: ...Description 5 12 DO FRQ RESP TST Description 5 14 GATE ON OFF Description 5 17 LISTEN ON OFF Description 5 19 RECALL FRM INT Description 5 20 SAVE TRB TO INT Description 5 21 TAKE REF TRACE Description 5 23 VIEW CO CHNL Description 5 27 6 System Measurements Menu Map and Softkey Descriptions What You ll Find in This Chapter 6 2 System Measurements Menu Map 6 3 System Measurements Softkey Function ...

Страница 19: ...ption 6 23 PLAN 2 Description 6 24 PLAN 3 Description 6 25 PLAN 4 Description 6 25 PLAN 5 Description 6 25 Prev Menu Description 6 26 PREV PAGE Description 6 26 PRINT REPORT Description 6 26 Recall Data Description 6 27 RECALL FRM CRD Description 6 27 RECALL FRM INT Description 6 28 Recall TstPlan Description 6 29 SAVE TO INT MEM Description 6 29 SAVE TO MEM CRD Description 6 30 Save TstPlan Descr...

Страница 20: ...scription Analyzer Input Description CHANNEL SELECT Description Channel Tuning Description CSO FREQ OFFSET and CM FREQ OFFSET Description EXT AMP GAIN Description EXT AMP NZ FIG Description EXT AMP YES NO Description EXT PAD YES NO Description HRC Description IRC Description Monitor TV Description PICTURE ON OFF Description PIX SND ON OFF Description Setup Description SOUND ON OFF Description STD ...

Страница 21: ...epth of Modulation Test Description Digital Channel Power Measurement Description Color Test Descriptions Chroma Luma Delay Inequality 8 5 8 7 8 16 8 18 8 24 8 28 8 30 Differential Gain Differential Phase 8 33 In Channel Frequency Response Test Description 8 40 FM Deviation Test Description 8 43 Cross Modulation Test Description 8 44 System Frequency Response Test Description 8 45 View Ingress Tes...

Страница 22: ...I Glossary Index Contents 7 ...

Страница 23: ...tion 2 24 2 17 CSO Measurement 2 29 2 18 CTB Measurement 2 29 2 19 Cross Modulation Measurement 2 30 2 20 Depth of Video Modulation Measurement 2 32 2 21 TV Line Number 2 33 2 22 Depth of Video Modulation More Information 2 34 2 23 FCC Composite Test Signal 2 37 2 24 NTC 7 Composite Test Signal 2 38 2 25 Differential Gain Differential Phase Measurement 2 40 2 26 Differential Gain Differential Phas...

Страница 24: ...Page 1 3 16 Tests Results Screen Page 2 3 16 Tests Results Screen Page 3 3 17 Timed System Measurements 3 21 Enter by Channel 3 24 Enter by Range First Channel Number 3 27 Enter by Range Last Channel Number 3 27 View Current Test Plan 3 32 Catalog Analyzer Internal Memory 3 33 ARAMCard Channel Measurements Main Menu 1 of 3 3 37 5 4 Channel Measurements Main Menu 2 of 3 5 5 Channel Measurements Mai...

Страница 25: ...odulation On 8 7 HUM Video Modulation OFF 8 8 HUM More Information 8 9 Measuring the Depth of Modulation 8 10 Tuned Digital Channel Display 8 11 Results of Digital Channel Power Test 8 12 FCC Composite Test Signal 8 13 NTC 7 Composite Test Signal 8 14 Chrominance to Luminance Delay 8 15 Differential Gain Differential Phase 8 16 In Channel Frequency Response 8 17 Multi Burst Response 8 18 Cross Mod...

Страница 26: ...tion Contained in a Printout 6 12 6 3 Information Contained in a Printout 6 15 8 l Auto Resolution Bandwidth RBW and Video Bandwidth VBW selection 8 31 8 2 Comparison of CLDI Measurement Values 8 36 9 l FCC Numerical Designation of Television Channels Section 73 603 9 10 9 2 Channel IdentiEcation Plan EIA Interim Standard No 6 CP and FCC Part 76 612 9 13 9 3 FM Broadcast Channels 9 19 9 4 T Channe...

Страница 27: ...Contents ...

Страница 28: ...I 1 Getting Started ...

Страница 29: ...nd in This to perform cable TV measurements using the HP 85721A Cable TV Chapter Measurements and System Monitor Personality This chapter contains the following sections l supported spectrum analyzer requirements l setup for cable TV measurements l deleting the HP 85721A personality from the analyzer l 2 ...

Страница 30: ...irements for Running the HP 85721A Personality l HP 9591C analyzer and HP 9590 E Series spectrum analyzers are supported with firmware dated 930923 or later 0 Option 004 Precision Frequency Reference l Option 043 R 232 or Option 021 HP 191 Interface required for printer output and programming l Option 301 TV Sync TriggerlFAOC or Options 101 and 1021 l Option 107 TV receiver required for video and ...

Страница 31: ...ing out the results The steps are as follows l Load the HP 85721A personality into analyzer memory if necessary l Perform the self calibration routines 0 Install a printer l Connect cable for non interfering measurements l Start channel or system mode of operation N O T E The HP 85721A personality is pre loaded into the HP 8591C analyzer l 4 ...

Страница 32: ...oad the HP 8572 1A personality into analyzer memory I Plug the analyzer into an ac power supply Press Cm If CABLE TV ANALYZER and TV RECEIVER are displayed skip to Step 2 Perform the self calibration routines I locate the arrow printed on the card label l 5 ...

Страница 33: ......

Страница 34: ...ng is complete press Cm CODE LOADER Follow the on screen instructions to complete the loading process If upgrading first erase the DLP memory See the section Deleting the Personality located in this chapter REF 48 8 dBmV AT 10 dB SA St S C F CORI HP859X 512 15 17 52 18 JBN 31 1 9 9 5 435 07 19 35 FEE 08 1995 LOAD FILE D E L E T E FILE S E L E C T PREFIX E x i t CatalPg Previous Menu CENTEK YWW IVH...

Страница 35: ...zer to meat its specifications and characteristics the self calibration routines should be performed periodically or whenever the ambient temperature changes Sea the operating manual for the analyzer to determine how often the self calibration routines should be oarformed Attach the calibration cable from the CAL OUT connector to the INPUT connector with the appropriate adapters PY29A l 8 ...

Страница 36: ...utine has bean performed recently press CAL FREQ instead of CAL FREQ AMPTD The analyzer s frequency and amplitude self calibration routine take about 1 5 or 9 minutes to complete respectively If an error massage is displayed refer to the Installation and Verification Manual for the analyzer PY2lOA I Press CAL STORE PY21 1A l 9 ...

Страница 37: ...n K 232 interface Option 043 Connect the analyzer to the printer using an HP IS cable Turn the printer on 213 Press 1 PRINT CONFIG PRINTER ADDRESS Enter address that your printer is sat to usually at II using the data keys than press Cm Sea the printer s documentation for more information about the selection of the printer s address Than skip the following two steps and continua with the next step...

Страница 38: ...3242G RS 232 cable Turn the printer on PLOTTERS ARE NOT SUPPORTED BY THE HP 85721A PERSONALITY I 0 4 Press CONFIG MORE 1 of 3 BAUD RATE enter a baud rata with the data keys than press ENTER to set the baud rate of the analyzer The baud rate of the analyzer must match the baud rate of the printerA N O T E If you are using an HP 22250 ITS 232 Thinkjet printer refer to Printing and Plotting chapter o...

Страница 39: ...alled in your analyzer Option 107 is required for video and non interfering measurements and TV receiver mode of operation Otherwise proceed to the next step I Attach one right angle BNC adapter to the TV TRIG OUTPUT ITTLJ connector and another right angle BNC adapter to the GATE TRIGGER INPUT ITTLI Connect a short BNC cable between the two adapters l 1 2 ...

Страница 40: ...procedure is not required when the HP 8591C analyzer is purchased with Option 107 because the cable is pre installed l When performing non interfering measurements the external coupler must also be connected See Chapter 2 Step 2 Connect the signal to the analyzer 1 1 3 ...

Страница 41: ...ents on groups of channels Note that when the analyzer is in channel mode CHNL is displayed in the upper right corner of the analyzer display SYSTEM is displayed in the upper right corner of the analyzer display when in system mode The softkeys accessed by pressing Setup allow you to customize the HP 857214 personality to your equipment and system Chapters 2 and 3 contain information on how to use...

Страница 42: ...utlined below remove the HP 85721A personality tests and functions added to the analyzer by the ROM measurements card 1 Press PRESETI Wait for the preset routine to finish 2 Press CONFIG More 1 of 3 3 Press Dispose User Mem ERASE DLP MEM ERASE DLP MEM 4 Press ZFi 1 15 ...

Страница 43: ...I Getting Started ...

Страница 44: ...I 2 Channel Measurements ...

Страница 45: ...activate Press Carrier Level and Frequency CARRIER LVt FRQ Carrier to Noise CARRIER NOISE Chromalluma Delay Inequality CLDI Composite Second Order Composite Triple Beat CSO CTB Cross Modulation CROSSNOD Depth of Video Modulation DEPTH MOD Differential Gain Differential Phase DIF GAIN DIF PHAZ Digital Channel Power DIGITAL CH POWER FM Deviation FM DEV Hum HUM In Channel Frequency Response IN CHNL F...

Страница 46: ... the steps that are necessary to make channel measurements The steps are as follows 1 Configure the test system 2 Connect the signal to the analyzer 3 Make the measurements 4 Access the spectrum analyzer mode 5 Access the TV receiver mode optional 2 3 ...

Страница 47: ... access the Setup menu again and change it 1 If the Setup softkey is displayed press it now Otherwise press LMODE CABLE TV ANALYZER Setup 2 Press Channel Tuning then press STD AIR HRC IRC T until the desired format is underlined The tune configuration menu allows you to select channel format l STD Standard Cable l AIR Broadcast Channel l HRC HRC Cable l IRC IRC Cable l T Upstream Channels USR CH 0...

Страница 48: ...plitude loss l Connect the matching pad to the spectrum analyzer input l Press Analyzer Input EXT PAD YES NO to underline YES l Press Prev Menu to return to the Setup menu If you are using a spectrum analyzer with 50 fl input impedance but are not using an external matching pad de block the analyzer will compensate for most of the impedance mismatch but amplitude measurements can have up to 3 0 2 ...

Страница 49: ...the noise Egure value of the external ampliEer The default value is 7 dB for the HP 85905A preampliEer l Press Prev Menu to return to the Setup menu The TOTL PWR B INPUT function measures the total RF power into the analyzer Use this function to externally adjust the total power into the analyzer or preampliEer for optimization of measurement dynamic range 16 32 15 OEC 86 1993 EF 37 5 dBmV enm AT ...

Страница 50: ...upon Ending a quiet line At this point if a quiet line is displayed press CONTINUE to execute the measurement If a quiet line was not found you must search for it using the m step up and iJJ step down keys If GATING YES NO is set to NO upon executing the carrier to noise or CSO measurements you will be prompted to turn off modulation to execute the measurement in an interfering manner 7 Fbr analyz...

Страница 51: ...mV AT 10 dB PEAK LOG 10 dB Elm Channel Tuning hnaIyZW Input AA SB SC FC CORR Prev Menu ENTER 57 888 tlHz SPAN 6 888 NHz RES BW 30 kHz JBW 38 kHz SUP 20 0 msec RT Figure 2 3 Tests Configuration Menu 8 Connect the cable TV signal as shown in Step 2 Connect the signal to the analyzer n 2 8 ...

Страница 52: ...bottom of the screen Total power at the input mixer can be reduced by increasing input attenuation Press C 1 ATTEN and make the adjustment The analyzer retains a manually selected attenuation until you either select a new value or reset the analyzer power on default conditions For all tests provided by the HP 85721A personality the analyzer automatically selects the attenuator setting to meet the ...

Страница 53: ...he front panel However on HP 8590 E Series spectrum analyzers with Option 107 the TV IN connector is located on the rear panel Figure 2 4 Connecting the Cable to the Input Connector Figure 2 5 Connections for HP 8591C analyzer with pt77 3 Option 107 Hints You can return to the channel measurements softkeys by pressing CMODE MODE_ 2 1 0 ...

Страница 54: ... are lost in the CABLE TV ANALYZER mode press MODE to reenter the CABLE TV ANALYZER mode then enter a channel number 4 If you want to set the analyzer to the power on default conditions after using the cable TV functions you can either cycle the power or press j j 5 After exiting any test you can step up or down to an adjacent numbered channel by pressing m step upl or J step down 6 Appropriate ve...

Страница 55: ...out resolution of 100 Hz or 10 Hz 100 Hz is the default setting as 10 Hz significantly slows down the measurement See Figure 2 8 4 Press SCRAMBLD YES NO YES when measuring sync suppressed scrambled channels The analyzer performs a max hold 5 Press NEXT CHANNEL to measure the next channel 6 If you want to store the results to a RAM card insert a formatted RAM card into the analyzer s card insertion...

Страница 56: ...i A ii SCRfiflBLO YES Q FRED ON OFF CENTER 57 888 flHz SPAN 6 888 MHZ WRES BW See kHz UBW 3 NHz LSWP se 8 mZet RT Figure 2 6 Carrier level Measurement 16 35 22 DE CHRNNEL R E F 3 4 6 dBmT c 86 1993 CNTR 55 2688 MHz MflIN MENU CENTER 57 880 MHz SPAN 6 088 MHz YRES BW 380 kHz WUBW 3 MHz SWP 75 8 nsec RT Figure 2 7 Carrier Frequency Measurement 100 Hz Resolution 2 1 3 ...

Страница 57: ...EL LOG j t j SCRAMBLD YES No FREQ 1 j j i j 1 m OFF CENTER 57 088 MHz SPAN 6 888 MHz WRES BW 300 kHz WVBW 3 MHz SWP 75 8 msec RT Figure 2 8 10 Hz Resolution Hints For best results the carrier to noise ratio in 4 MHz BW of the system should be 40 dB or greater and the measured signal level should be 30 dB or greater above the displayed noise during the test 2 14 ...

Страница 58: ...dulation c Using the knob move the marker to the desired position in the indicated FCC MEASUREMENT RANGE see Figure 2 9 Note that the test compares the noise level at the analyzer input to that of the analyzer itself If these levels are within 3 dB of each other the analyzer will display the message See MORE INFO next to the measurement result See Figure 2 10 If the difference is less than 2 2 dB ...

Страница 59: ... NO a Press GATE ON OFF in the CARRIER NOISE menu to perform a gated non interfering measurement b The analyzer will search for a quiet line and depending on the setting of PAUSE it will either pause or automatically continue if it finds a quiet line If it does not End a quiet line it will display VIDEO SYNC NOT RECOGNIZED At this point you can remedy the reason or if a quiet line was not found be...

Страница 60: ...UE to complete the measurement and display the test results on the screen See Figure 2 12 e The default center marker setting is 2 25 MHz above the visual carrier The default integration range of 85 then places the outer integration range markers are then placed to measure the entire FCC measurement range excepting the carrier itself The center marker can be moved using the front panel knob 2 17 ...

Страница 61: ...HANNEL m STO MKR 225 582 MHz REF 4 3 dBmV AT 10 dB 39 72 dBmV G T P O S LOG ti FCC MEhSUREtlENT RANGE 4 MHz WA SB SC FS OUTER M A R K E R S D E F I N E hClU L N O SE I NTEGRATION RANGE CORR KNOB CONTROLS CENTER OF RANGE C N ii MHz dBc START 221 752 NHz STOP 227 752 llHz YRES BW 30 kHz YUBW 3 MHz XSWP 6 96 set mm GATE ON OFF CIUERAGE I OFF NORE INFO MAIN MENU Figure 2 12 Carrier to Noise Modulation...

Страница 62: ... sure the channel modulation is turned back on then press MAIN MENU again 7 Pressing MORE INFO displays the carrier to noise calculation See Figure 2 13 Pressing RE ENTER TEST restarts the test from the beginning Pressing TTL PWR Q INPUT calculates the total input power making input level adjustments more convenient Pressing MAIN MENU exits the test 14 88 54 JAN 25 1995 CHANNEL STO REF 4 3 dBmV AT...

Страница 63: ...ou to measure the CSOKTH without having to turn the modulation back on then off again for analyzers without Option 1071 or to reselect a quiet line lfor analyzers with Option 107 3 Carrier to Noise Measurement Accuracy is degraded as the cable TV system noise approaches the analyzer noise This is reflected in the magnitude of the Analyzer Noise Correction Value 4 When in the carrier to noise measu...

Страница 64: ...r used in conjunction with a filter will provide the best coverage of signal range for optimizing the total power at the input I 1 Optimizing the Total Power at the Input If the analyzer correction value dictates that it is necessary to optimize the analyzer noise floor for a particular configuration press the following keys mq CABLE TV ANALYZER Setup Analyzer Input TOTL PWR P INPUT For carrier to...

Страница 65: ...tarts at the default line number line 18 If a test signal is not found the search routine will stop at the first NTC 7 or FCC composite test signal it finds while counting down from line 22 to line 10 Figure 2 14 shows the FCC composite test signal Figure 2 15 shows the NTC 7 composite test signal 6 MKR 3 9 2 0 0 psec REF 1 4 2 6 mV AT 10 dB 8 4 2 4 2 mV _ kLkL I TV L I N E LIN AUTO SIG SEARCH CON...

Страница 66: ...uma delay inequality measurements cannot be performed without a test signal line containing a 12 5T pulse Non standard test signal timing will affect results The analyzer s internal frequency calibration routine should be run at the temperature testing is to be performed 3 If the desired test signal is not displayed press SELECT LINE then enter a line number or press AUTO SIG SEARCH to execute the...

Страница 67: ...lt of the measurement is displayed on the analyzer display An offset of 170 ns is added to the result so that it will agree with tests done using a demodulator with 170 ns of delay Modulators should be set for 170 ns precorrection FCC requires measurements relative to this precorrection The FCC tolerance is 170 ns 7 Press MORE INFO to display chrominance to luminance response information See Figur...

Страница 68: ...nsert a formatted RAM card into the analyzer s card insertion slot press ISAVE display card then press MODE KTjFj to return to channel measurement mode Refer to Chapter 3 for the procedure on formatting a RAM card 9 If you want to print the results press Icopv lo Press MAIN MENU to exit the test 2 25 ...

Страница 69: ...er position and measure the beat in a zero span sweep 3 Perform the following steps if your analyzer has Option 107 installed and you want to perform a gated non interfering measurement CSO only with modulation turned on Note that you will only have gotten to this point if GATING is set to NO a Press GATE ON OFF in the CSOKTB menu to perform a gated non interfering measurement b The analyzer will ...

Страница 70: ...llow measuring beats other than at standard CSOICTB offsets Press ZOOM f MEASURE to zoom in on the current marker position and measure the beat in a zero span sweep The results of the measurement are displayed at the bottom of the analyzer display 5 Press More 6 Press ATTEN STEP DN or ATTEN STEP UP to switch the attenuator to check for analyzer generated beats when not using a bandpass filter Swit...

Страница 71: ...calculates the total input power making input level adjustments more convenient Pressing MAIN MENU exits the test g Press Prev Menu 10 If you want to store the results to a RAM card insert a formatted RAM card into the analyzer s card insertion slot press SAVE display card then press iZK KjK to return to channel measurement mode Refer to Chapter 3 for the procedure on formatting a RAM card 11 If y...

Страница 72: ...8 01 NOU 23 1993 tEF _ SNtg H STO MKR 54 888 MHz AT 10 dB 33 83 dBnV Figure 2 17 CSO Measurement 2 21 13 NOW 23 1993 V CHANNEL m STO MKR 49 268 MHz ENTER 50 768 MHZ RES BW 36 kHz SPflN 6 880 NH YUBW 3 HHz SUP 6 98 ICC RT Figure 2 l 8 CTB Measurement 2 2 9 ...

Страница 73: ...MODEI to return to channel measurement mode Refer to Chapter 3 for the procedure on formatting a RAM card 3 If you want to print the results press Icopv 4 Press MAIN MENU to exit the test 16 56 38 Oft 86 1993 7 CHi oNNEL m STO MKR I 4 388 kHz m l CENTER 433 259 MHz SPAN 8 Hz YRES BW 1BB kHz YUBW 1BB kHz YSWP 28 0 nsec MHIN MENU RT Figure 2 19 Cross Modulation Measurement Hints For best results the...

Страница 74: ...ult is updated every 10 analyzer sweeps approximately every 3 seconds and continues until STOP MEAS or MAIN MENU is pressed See Figure 2 20 NOTE I Large amounts of hum and low frequency disturbances may affect the measurement result If so use TV line NOTE This test must have a white level present during the vertical interval because program video may not always have white level available 2 31 ...

Страница 75: ...W 1 0 MHz XVBW 1 MHZ S P A N 0 H Z SWP 3 0 0 msec TV I N E STOP MEAS MORE INFO MAIN MENU Figure 2 20 Depth of Video Modulation Measurement 3 For spectrum analyzers with TV Sync Option 102 and Fast Time Domain Sweeps Option lOl the test can also be performed on an individual TV line a Press TV LINE X Line 17 appears as default line number NOTE Options 102 and 101 are standard with the HP 8591C anal...

Страница 76: ...p and down arrow keys a and 7J J to increment and decrement respectively the current line number by one Video average can be used to smooth a signal by pressing the following keys TRACE MORE 1 of 3 VID AVG ON OFF ON is underlined c To return to the cable TV menu turn video average off OFF is underlined press Detector PK SP NG until SP is underlined then press MODE MODE d To view multiple horizonta...

Страница 77: ...results ideal value and other measurement considerations See Figure 2 22 Press RETURN when finished 14 46 48 N O V 2 3 1 9 9 3 4 M K R 7 3 0 0 0 msec R E F 8 3 8 6 mV AT 10 dE 1 0 2 3 0 mV SMPL L I N DEPTH OF MODULATION TEST T h e c u r r e n t t e s t resu t 1588 0 T h e Ideal v a l u e 1s 8 7 5 NOTE This t e s t requ res t h a t a white r e f e r e n c e be p r e s e n t I a t least o n e horizo...

Страница 78: ...DL DELTA ON OFF The delta display line is then positioned at the minimum white level Then the depth of modulation is displayed in the active function area For further information about the delta display line refer to the DL DELTA function description in Chapter 5 When finished turn Analog ON OFF OFF Press the mode key twice cm InnoDE_ to return to the cable TV menu NOTE You cannot re start the dep...

Страница 79: ... the carrier to noise ratio of the system should be 40 dHc or greater lin a 4 MHz noise bandwidth 2 For this measurement to work correctly the Vertical Interval Test Signals NITSI must include a white signal level In addition you may need to turn off channel scrambling 2 36 ...

Страница 80: ...FCC composite test signal it finds while counting down from line 22 to line 10 Figure 2 23 shows the FCC composite test signal Figure 2 24 shows the NTC 7 composite signal Differential 1 Select a channel then press Main 1 of 3 Main 2 of 3 gain differential phase DIF GAIN DIF PHAZ test 14 2 2 5 9 N O 2 3 993 MKR 3 9 2 0 0 Jsec REF 142 6 m AT 10 dB 8 4 2 4 2 mV SELECT L I N E AUTO SIG SEARCH J LJ CO...

Страница 81: ... SPAN 0 HZ RSWP 8 0 psec SELECT L I N E F I E L D ODD EE AUTO SIG SEARCH Select T e s t Slg CONTINUE Figure 2 24 NTC 7 Composite Test Signal N O T E These measurements cannot be performed without a test signal containing a modulated staircase The 5 step riser start and stop timing can affect measurement results if the timing is different from the defined standard 2 38 ...

Страница 82: ...selection a Press FCC COMPOSIT to select the FCC composite test signal or NTC 7 COMPOSIT to select the NTC 7 composite test signal To assist in test signal identiEcation a small schematic diagram of the test signal is displayed at the top of the screen b Press 5th PKT YES NO to determine whether the 5th riser of the staircase is included in the measurement The default is NO NO is underlined and th...

Страница 83: ...m mode differential phase test uses the current setting of this switch when the test plan was created Which test was used is reported on the results table d Press Prev menu 6 Press ClF AVERAGES enter the desired number of averages then press ENTER The default is 50 averages The higher the number of averages the more consistent results when measuring low level signals This value is always returned ...

Страница 84: ... card 9 If you want to print the results press IcoPv 10 Press MORE INFO to display the averaged results of the individual packets This will be useful for relative measurements See Figure 2 26 15 29 12 NAR 86 1995 t CNRNNEL m STO PEF 26 46 SV AT 10 dB DIFFERENTIAL GAIN m l VB SC TC CORR 1 REF i 2 3 4 I START 183 808 FlHz STOP 183 888 IlHz XRES BW 388 kHz YUBW 3 HHz YSNP 28 psec MORE INFO MRIN MENU ...

Страница 85: ...el edges must be within the display limits for accurate results The default RBW and VBW assumes the channel bandwidth occupies at least 75 of the selected span 16 35 27 SEP 12 1996 LiG mm SYSTEM FRQ RSP MllFl 8 of 8 ICENTER 314 68 NHz SPAN 8 88 MHz 1 RES 8W 1BG kHz U8W 38 kHz SWP 28 8 msec RT k DIGITAL CH POWER IN CHNL FRQ RSP DIF GRIN DIF PHfiZ CLDI Figure 2 27 Tuned Digital Channel Display When ...

Страница 86: ...Y FRQ in the Tune Config menu the visual carrier frequency will be used as the center frequency in the channel power measurement If you try to manually set the center frequency to a value other than the visual carrier it will be reset to the value of the visual carrier when running the test The markers are automatically placed at the estimated left and right edges of the selected channel The total...

Страница 87: ... final result The input range is from 1 to 999 and the default is 10 If averaging is off the total power is recalculated and displayed automatically at the end of each sweep With averaging on the result is displayed after the number of specified sweeps have been reached All results are displayed in current measurement units 16 41 38 SEP 12 1996 CHPoNNEL m STD REF 29 3 dBmV AT 10 dB SRPL NKR 317 58...

Страница 88: ...l Measurements Making Channel Measurements N O T E The analyzer has been configured for maximum accuracy Adjustment of VBW or RBW may degrade the measurement performance Press MAIN MENU to exit the test 2 45 ...

Страница 89: ...peak to peak extreme found during the measurement time 2 If desired change the number of cycles per measurement by pressing CYCLES MSMT The default is 25 cycles per measurement 3 If you want to store the results to a RAM card insert a formatted RAM card into the analyzer s card insertion slot press SAVE display card then press MODE MODE_ to return to channel measurement mode Refer to Chapter 3 for...

Страница 90: ...ts 5 35 42 NOV 2 3 1 9 9 3 MKR A 7 5 0 0 0 pet REF 1 5 dBmV A T 1 0 dB 6 0 0 5 0 kHZ FMV LOG 10 dB I I I I I I I I C E N T E R 7 1 7 3 9 MHz SPAN 0 H Z AES BW 1 0 0 kHz XVEW 100 kHz SWP 2 0 0 msec CYCLES MSMT MAIN MENU Figure 2 29 FM Deviation 2 47 ...

Страница 91: ...y Pressing MORE INFO results in the analyzer performing a single sweep of 800 ms and performs a Fast Fourier Transform FFT on it to separate power line related components See Figure 2 31 60 Hz 120 Hz 180 Hz and 240 Hz are displayed This is intended to be used as a troubleshooting aid A relatively high 60 Hz level implies inadequate grounding or stray power utility neutral currents A relatively hig...

Страница 92: ...AT 10 dB 996 x EAK IN UA SE C F C MORE CORR INFO M A I N MENU ENTER 6 7 2 3 5 MHz S P A N 0 H Z RES BW 1 0 MHz VBW 1 MHz SWP 3 0 0 msec Figure 2 30 Hum Measurement 18 84 33 LIEC 13 1 9 9 3 mm NRIN MENU C E N T E R 6 7 2 4 8 RHz S P A N E H z Y R E S BW 1 B MHz YUBW 1 M H z Y S W P 868 m ec RT Figure 2 31 Hum More Information 2 49 ...

Страница 93: ...l It cannot give meaningful results when a channel uses sync suppression scrambling unless the measurement is made at the subscriber terminal output of a descrambler Measuring hum with video modulation present requires that all sync tips have the same general level in order to measure their variation When the hum test is performed on channels with sync suppression scrambling it gives completely me...

Страница 94: ...ESP calculates the frequency response using the positions of the 2 markers C Pressing RESTART MAX HOLD resets Trace A Hints a Press the m HOLD1 key to clear the active area to make markers more visible if placed there b Try using line sync when the sweep signal is sweeping at a rate near the vertical sync rate Press TRIG LINE 3 If Option 107 is installed press VITS TEST to select a vertical interv...

Страница 95: ...elect the displayed test signal The selections are GCR Ghost Cancellation Reference MULTI BURST FCC multi burst NTC 7 CMBNTN NTC 7 combination multi burst or SIN X X sine x x Refer to Figure 2 32 Figure 2 33 Figure 2 34 and Figure 2 35 4 Press CONTINUE to execute the measurement The peak and valley in the measurement range will be found and used to calculate the result See Figure 2 36 and Figure 2...

Страница 96: ...TV SIN X X CENTER 69 000 MHZ RES BW 300 kHz SPAN 0 nz BW 3 MHZ SWP 80 psec Figure 2 32 Ghost Cancellation Reference GCR N O T E The function that views test signals is intended for signal identification only Significant signal distortion and high frequency roll off does not affect the actual measurement I I 2 53 ...

Страница 97: ...C TC CORR CENTER 69 000 MHZ XRES BW 300 ktiz PreV Menu SPAN 0 HZ B BW 3 MHZ SWP 80 psec Figure 2 33 FCC Multi Burst Test Signal 15 00 37 ND CHANNEL 4 23 1993 ST01 REF 4 GCR TY LIN MULTI BVRST SIN X X WA SB SC TC CORR CENTER 69 000 MHz RES BW 300 ktiz Pre Menu SPAN 0 HZ VBW 3 MHZ XSWP 80 pet Figure 2 34 NTC 7 Combination Multi Burst Test Signal 2 54 ...

Страница 98: ...CORR Pre Menu CENTER 69 000 MHz SPAN 0 HZ XRES BW 300 kHz i BW 3 MHZ SWP 80 psec Figure 2 35 Sine XIX Test Signal is 07 06 NOV 1993 5 4 23 CtiANNEL STDI REF 4 PEAK LOG 10 dB MKR 70 965 MHZ MARKER 1 MARKER 2 WA SB SC FC CORR CENTER 69 000 MHz RES BW 300 kHZ MAX HOLD ON OFF MAIN MENU SPAN 6 000 MHZ BW 3 MHZ SWP 6 90 set Figure 2 36 Results with GCR or line Sweep Test Signal 2 55 ...

Страница 99: ... 6 000 MHz XRES BW 300 kHz XVBW 3 MHz SWP 6 90 set Figure 2 37 Results with FCC Multi Burst Test Signal 15 05 55 NOV 4 23 1993 CHANNEL 4 STO REF 2 GTPOS LOG 4 dB MKR 70 860 MHZ MARKER 1 MARKER 2 WA SE SC FS MORE CORR INFO MKq 2 15 7 MAIN FR 0 RE P i 0 7 d8 M B MENU CENTER 69 000 MHz SPAN 6 000 MHz RES EW 300 kHz VBW 3 MHz SWP 6 90 set Figure 2 38 More Information Multi Burst 2 56 ...

Страница 100: ...If you want to use a reference trace that was previously stored in the analyzer s internal memory and you know the trace register number of the reference trace press RECALL FRM INT See Chapter 5 for more information about using RECALL FRM INT 5 If you want to create a reference trace press CONTINUE TAKE REF TRACE See Chapter 5 for more information about using TAKE REF TRACE 6 After the reference t...

Страница 101: ...se Measurement 8 Press CONTS SWEEP for continuous sweep or to restart the sweep g Press CENTER FREQ to specify the center frequency This is not normally needed but is useful to fine adjust the measurement data relative to the reference data to minimize ripple 10 Press MARKER ON to turn the marker on ll Use MARKER A to determine the difference in frequency and amplitude relative to the first marker...

Страница 102: ...dend then compared to a flatness measurement made somewhere out in the system 1 Take a reference trace at point A as previously described for example at the headend or first trunk ampliEer 2 Go to point B and make a measurement The result is the difference between points A and B 3 Use the FAST SWEEP function for real tune amplifier adjustments 4 Use the SLOW SWEEP for the most accurate results whe...

Страница 103: ... S P A N 6 0 0 8 IlHz Y R E S BW 1 0 0 kHr WVBW 1 kHz SWP 1 8 0 llscc ml VIEW CO CHNL L I S T E N AT MKR 108 kHz R E S BW 3 0 kHz R E S 3W MhIN MENU RT Figure 2 40 View Ingress 3 During the test you can change the default 100 kHz resolution bandwidth RBW For example you might select 30 kHz RES BW to improve resolution of signals close to the visual carrier Return to 100 kHz RBW by selecting 100 kH...

Страница 104: ...M A I N MENU C E N T E R 6 7 2 3 6 7 5 NHz S P A N 5B BB kHz R E S SW i B kHz YUBW 10 Hz SWP 1 5 8 5cc Figure 2 41 View Co Channel Measurement N O T E Because of the minimum hold function used in this measurement the delta marker display is approximately 3 dB lower than the actual signal level For example if the marker displays 50 dBc the actual signal level is closer to 47 dBc 2 61 ...

Страница 105: ...um analyzer operating mode while in the cable TV analyzer operating mode select a front panel hard key for examole f EEEJ EGFiEF then make adjustments and measurements as needed Then press EEF DIODE to return to the cable TV analyzer operating mode When the analyzer is in the spectrum analyzer operating mode CHNL is no longer displayed in the upper right corner of the analyzer display 2 62 ...

Страница 106: ...sity knobs for the desired volume level and picture intensity To exit TV picture and sound press any of the following WINDOWS m CAUXCTRL ml or any softkey Additionally the TV picture and sound can be accessed from within the channel measurements mode by pressing WINDOWS loN_ Channels can then be selected with the numeric keypad then pressing ENTER You can also use the knob or arrow keys for channe...

Страница 107: ...I Channel Measurements Making Channel Measurements ...

Страница 108: ...3 System Measurements ...

Страница 109: ...a RAM card l formatting a RAM card l deleting all the Iiles from a RAM card l deleting individual Eles from a RAM card The following tests can be performed in SYSTEM MEAS mode 0 visual aural carrier levels 0 visual aural carrier frequencies l depth of modulation humt l csot 0 carrier to noise ratio l DG DP CLDIt l in channel frequency responset l FM deviation If a test fails in the SYSTEM MEAS mod...

Страница 110: ...in Option 107 based tests Advertisement insertion equipment may cause these signals to be deleted during their active time Once all test plans have been created and saved to internal memory or RAM card the measurement process is a simple six step operation I ConEgure the test system 2 Connect the signal to the analyzer 3 Enter the location code 4 Enter the temperature 5 Recall a test plan from int...

Страница 111: ...lyzer retains the information even when power is turned off until you access the Setup menu again and change it l If the Setup softkey is displayed press it now Otherwise press MODE CABLE TV ANALYZER Setup 2 Press Channel Tuning then press STD AIR HRC IRC T until the desired format is underlined The tune conEguration menu allows you to select channel format l STD Standard Cable l AIR Broadcast Cha...

Страница 112: ...e external pad causes approximately 5 8 dB of amplitude loss The external pad function EXT PAD YES NO can be used to compensate for this amplitude loss l Connect the matching pad to the spectrum analyzer input l Press Analyzer Input EXT PAD YES NO to underline YES l Press Prev Menu to return to the Setup menu If you are using a spectrum analyzer with 50 Q input impedance but are not using an exter...

Страница 113: ...s Analyzer Input EXT AMP YES NO to underline YES l Press EXT AMP GAIN then enter the gain value of the external amplifier The default value is 20 dB for the HP 85905A preampliEer l Press EXT AMP NZ FIG then enter the noise figure value of the external amplifier The default value is 7 dB for the HP 85905A preamplifier l Press Prev Menu to return to the Setup menu The TOTL PWR Q INPUT function measu...

Страница 114: ... of the measurement data If you want to change the offset for CTB and CSO relative to the channel selected with SYS BTS TST CHNL press CTB FREQ OFFSET enter the frequency offset for measuring CTB from the carrier then press CENTER Similarly press CSO FREQ OFFSET enter the frequency offset for measuring CSO from the carrier then press ENTER Entering an offset as negative will allow measurements bel...

Страница 115: ... power is displayed at the bottom of the screen Total power at the input mixer can be reduced by increasing input attenuation Press 1 ATTEN and make the adjustment The analyzer retains a manually selected attenuation until you either select a new value or reset the analyzer power on default conditions For all tests provided by the HP 85721A personality the analyzer automatically selects the attenu...

Страница 116: ... front panel However on HP 8590 E Series spectrum analyzers with Option 107 the TV IN connector is located on the rear panel Figure 3 3 Connecting the Cable to the Input Connector Figure 3 4 Connections for HP 8591 C analyzer with Option 107 RF Measurements Hints You can return to the system measurements softkeys by pressing C 1 cm 3 9 ...

Страница 117: ... the lower right corner of the analyzer s front panel next to the ENTER key 4 Press ENTER when the location code has been entered ENTER LOCATION allows you to enter a location code The location code is only for your convenience it is meant to help you keep track of where the data originated The location code you enter will be stored and printed with the data E N T E R Location C o d e u s i n g t ...

Страница 118: ...e has been entered ENTER TEMP allows you to enter the ambient temperature without the Celsius or Fahrenheit units This function is only for your convenience it is not necessary to enter the temperature when making a measurement The temperature you enter will be stored and printed with the data The analyzer does not measure the temperature you must provide the temperature reading 5 49 56 NOV 23 1 9...

Страница 119: ...number under which the test plan was saved then press DONE For example if the test plan was saved under test plan 1 press PLAN 1 You can recall a test plan that was previously saved in analyzer memory Recalling a test plan will overwrite the current test plan If you do not want the current test plan overwritten save the current test plan before recalling a test plan See 3 Save the current test pla...

Страница 120: ...M I N T R E C A L L FRll INT R e c a l l t e s t p l a n from i n t e r n a l m e m o r y RECRLL R E C A L L F R N CR0 Recall test plan from M e m o r y Card FRM CRD M e n u Prev R e t u r n t o P r e v i o u s ilenu Prev Menu RT Figure 3 7 Recall from Internal Analyzer Memory 3 13 ...

Страница 121: ...tem CSO will be measured using the offset specified by the CSO FREQ OFFSET softkey located in the Setup menu The default value is 4 75 MHz above the test channel s visual carrier Alternatively set the SYS BTS TST CHNL to the highest channel in the system If there are no signals just above the top channel set the CSO FREQ OFFSET to 7 25 MHz These settings will measure the CTB and 1 25 MHz CSO beats...

Страница 122: ...rmatting a RAM Card later in this chapter for information about formatting a RAM card 15 54 59 NOW 23 1993 DUMP T O S C R E E N T e s t n o w with r e s u l t s spnt t o SoPee OUIIP T O P R I N T E R T e s t n o w w i t h r e s u l t s s e n t t o p r i n t e r DUMP T O C A R D T e s t n o w w i t h rrrults s t o r e d P RbH C a r d M a i n M e n u R e t u r n t o M a i n Menu DUMP TO SCREEN DUMP ...

Страница 123: ...creen Page 1 16 07 11 NOU 2 3 1 9 9 3 DATA FILE 0 PAGE 1 2 T e s t s C h a n n e l N u m b e r 7 8 9 1 0 11 Vis L v l dBm 1 2 9 13 2 13 4 12 9 12 7 Aur Lvl nd8 14 2 is Ii I 1 ____ ___ i4 UIS F r e q M H z 175 181 187 199 kHz 24178 24446 25995 76 L i 24911 Aur F r e q NHz 4 5EEE3 4 58885 4 49997 4 58883 4 49996 MOD DEPTH y 88 5 86 8 87 6 _ ___ ____ 1 I _ i __ __ _______ j _ _____ ______ 89 8 77 2 H...

Страница 124: ...dB i j LN FLD P T R N t j Y Y FN OEU fkHr 19 8 j25 1 j NEXT PhGE PREU PAGE GOT0 PAGE PRINT REPORT STORE TO CARD M a i n Menu RT Figure 3 11 Tests Results Screen Page 3 5 Press NEXT PAGE to view the next page or PREV PAGE to view the previous page 6 Press GOT0 PAGE to go to a specified page of test results 7 Press PRINT REPORT to print the test results 8 Press STORE TO CARD to store test data to a ...

Страница 125: ...ou want to use the spectrum analyzer functions after using the cable TV measurement system you need to access the spectrum analyzer mode When the analyzer is in the spectrum analyzer mode SYSTEM is no longer displayed in the upper right corner of the analyzer display To reaccess the cable TV measurement system press Ijj CABLE TV ANALYZER 3 18 ...

Страница 126: ... desired volume level and picture intensity 6 To exit TV picture and sound press any of the following WINDOWS ON AUXCTRL l i or any softkey 7 Additionally the TV picture and sound can be accessed from within the system measurements mode by pressing WINDOWS ON 8 Channels can then be selected with the numeric keypad then pressing ENTER You can also use the knob or arrow keys for channel selection 9 ...

Страница 127: ...en press ml Or press TODAY S DATE if you want to use the current date as the start date 5 Enter the time that you want testing to begin To enter the time use the data keys to enter the date in a 24 hour hour minute format then press ENTER Or press TODAY S TIMEDATE if you want to use the current date and time as the start date and time 6 Press STOP TIME 7 Enter the date that you want testing to end...

Страница 128: ...ing file number then press ENTER 12 If you want to stop the testing press ABORT It will take several seconds for the testing to stop c 16 09 68 NOU 2 3 1 9 9 3 STHRT T I M E S T A R T T I M E Enter s t a r t t1ae S T O P TItlE E n t e r S t o p t i n e STOP T I M E I N T E R V A L Entr tine between Strt times T I M E P R I N T E R S t a r t tlmed t e s t i n g w i t h results sent to printer T I M...

Страница 129: ...T PLAN clears the currently loaded test plan If You Make a Mistake If you make a mistake when entering a number with the data keys you can use the back space key to correct the mistake The back space key BK K l is on the lower right corner of the spectrum analyzer s front panel next to the YEi key 1 I It is very important to survey your system before creating a test plan You must be familiar with ...

Страница 130: ...d in the channel tuning key in setup 4 If the channel that you have entered is a scrambled channel press YES If the channel is not scrambled press NO 5 Select the tests for the channel l If you want to delete all of the tests for the channel press CLEAR TESTS l If you want to select all the tests press ALL TESTS l If you want to specify which tests are to be performed use the data keys to enter th...

Страница 131: ...ough 6 If you do not want to enter another channel press Prev Menu 8 If you want to view selected channels press VIEW CH SEL You can enter channels into the test plan as individual channels or as a range of channels This procedure describes how to enter channels individually into the test plan The next procedure describes how to enter a range into the test plan of channels E N T E R C h a n n e l ...

Страница 132: ...s to enter the last channel number then press iKq 5 After the channel range has been entered you need to press YES if the range of channels is scrambled or press NO if the range of channels is not scrambled N O T E The scrambled or unscrambled channel status applies to the range of channels that you have just entered 6 Select the tests for the range of channels l If you want to delete all of the t...

Страница 133: ...al gain differential phase and or chroma luma delay enter the line number of the test signal odd or even field and the desired test signal type when prompted N O T E The same quiet line and test signal numbers selected here will be used for all selected channels when using ENTER BY RANGE 7 After you have selected the test or tests press DONE 8 If you want to view the selected channels press VIEW C...

Страница 134: ... p a d E N T E R number t h e n prsrr t h e E N T E R k e y CHflNNEL 2 3 l RT Figure 3 14 Enter by Range First Channel Number 6 14 88 NOU 23 1 9 9 3 E N T E R j J C h a n n e l i n r a n g e u s i n g t h e keypad E N T E R n u m b e r t h e n p r e s s t h e E N T E R key RT Figure 3 15 Enter by Range last Channel Number 3 27 ...

Страница 135: ...e used to differentiate between test plans The title is shown when cataloging analyzer memory See Cataloging Analyzer Memory in this chapter a If you want to create a title using the analyzer s keys press 1 then CHANGE TITLE YZ SPC CLEAR CLEAR to clear the current title b Use the softkeys to create a new title For example press ABCDEF C ABCDEF A STUVWX T STUVWX V to create the title CATV c Press C...

Страница 136: ...he test plan in plan number 1 6 Press DONE You can save up to Eve different test plans in analyzer memory The test plans are stored in memory even if the analyzer is unplugged from a line power source The channel numbers tests scrambling status channel tuning conEguration quiet line number frequency response line number color test line number test signal type and Eeld information are stored for ea...

Страница 137: ...M MEAS More 1 of 2 Create TstPlan Save TstPlan 2 Press SAVE TO MEM CARD 3 Because there can be up to Eve different test plans saved in analyzer memory you need to select a number under which to save the test plan Press the softkey with the plan number under which you want the test plan saved For example press PLAN 1 to save the test plan in plan number 1 4 Press DONE 3 30 ...

Страница 138: ... Press DONE after all of the desired tests have been selected 6 If you want to edit the tests enter the channel number using the data keys then press ENTER You will be prompted for the scrambling status of the channel and the tests that you want performed on the channel If you want to delete a test enter the test number as a negative number To enter a negative number use the m key to enter the min...

Страница 139: ...dure describes how you can clear the current test plan The current test plan is the test plan that is displayed when you press VIEW CH SEL and it is the test plan that is used when making a measurement 6t15142 NOU 23 1 9 9 3 T u n e Config ST0 L o c a t i o n CQde 930027 T e m p 7 5 S e l e c t e d 7 8 9 18 11 C h a n n e l s 12 13 23 24 25 26 27 28 29 38 31 32 33 34 35 36 37 38 39 40 RT Figure 3 ...

Страница 140: ...og entry shows the date that the test plan was saved The date is displayed after the trace register TR number and TL If the test plan was saved with a title the title will be displayed also q6 16 39 N O J 23 1 9 9 3 ST TR R E G WP Ki II E S T 3 C F 1 58 GHz S T 4 C F 988 M H z S T 5 C F 988 M H z S T 6 C F 9 0 0 M H z S T 7 C F 988 NHz S T 8 C F 2 1 3 M H z TR0 T L 21 20 27 TRl T L 21 28 27 TR2 T ...

Страница 141: ...f RECALL FRM CRD is not displayed press MODE CABLE TW ANALYZER Recall TstPlan 2 Press RECALL FRM CRD 3 Press the softkey with the plan number you want to recall For example press PLAN 1 to recall the test plan in plan number 1 4 Press DONE 3 34 ...

Страница 142: ...ter 1 2 If Recall Data is not displayed press j GK CABLE TV ANALYZER More 1 of 2 3 Press Recall Data 4 Use the large knob on the analyzer s front panel to select the file that you want To select a hle turn the knob until the file that you want is highlighted 5 Press DATA TO PRINTER to print the test data 6 Press DATA TO SCREEN to display test data on the screen 3 35 ...

Страница 143: ...oging a RAM Card 1 If CATALOG CARD is not displayed press i66FJ CABLE TV ANALYZER SYSTEM MEAS More 1 of 2 2 Press CATALOG CARD CATALOG CARD displays a catalog listing of all the files on a RAM or ROM card 3 36 ...

Страница 144: ...ion slot 3 Press iG MORE 1 of 3 Card Config 4 Press FORMAT CARD FORMAT CARD This formats the RAM card 5 If SYSTEM is still displayed in the upper right corner of the analyzer display you can press iGiK MODE to return to the current cable TV measurements menu Before you use the RAM card for the first time you must format the RAM card Once the RAM card has been formatted the test plan and test data ...

Страница 145: ... card is not write protected 2 Insert the RAM card in the card reader 3 Press CONFIG MORE 1 of 3 Card Config 4 Press BLANK CARD BLANK CARD 5 If SYSTEM is still displayed in the upper right corner of the analyzer display you can press iG7 iZGF to return to the current cable TV measurements menu 3 38 ...

Страница 146: ... Press Catalog Card CATALOG ALL 6 Turn the large knob on the analyzer s front panel until the file that you want to delete is highlighted 7 Press DELETE FILE DELETE FILE 8 If SYSTEM is still displayed in the upper right corner of the analyzer display you can press ZK KKK to return to the current cable TV measurements menu You may want to delete one or more tiles from the RAM card to make room for ...

Страница 147: ...System Measurements Deleting Individual Files from a RAM Card ...

Страница 148: ...I 4 If You Have a Problem ...

Страница 149: ... related to the spectrum analyzer mode of operation consult the documentation for the analyzer This chapter is divided into the following sections l Problems that are indicated by error messages that appear on the analyzer display l Other types of problems problems that are not indicated by error messages l How to contact Hewlett Packard 4 2 ...

Страница 150: ...on the analyzer display The error messages are listed alphabetically by the first word in the message ALREADY ENTERED This message indicates that the channel number or test number has already been selected To solve this problem l If you want to delete the channel or edit the tests for the channel use ENTER BY CHANNEL l If you want to enter a range of channel numbers select another channel number t...

Страница 151: ... in Chapter 3 The catalog listing will show if a test plan has been saved in the trace register q A trace has been stored in the trace register for the test plan overwriting the test plan Remember that the test plans are stored in trace registers 6 through 10 l If a trace has been saved in the trace register for the test plan you will need to reenter the test plan CAUTION STOP TIME ALREADY PASSED ...

Страница 152: ...d in a 24 hour hour minute format CHECK CARD IN SLOT SAVE OFF This message indicates that the analyzer cannot write to the RAM card because the RAM card has not been inserted into the memory card reader or the write protect switch on the RAM card is set to the write protect position To solve this problem l Insert the RAM card in the analyzer s memory card reader l Move the write protect switch awa...

Страница 153: ... Ermware was September 23 1993 To solve this problem l If the release date for the analyzer s firmware was prior to September 23 1993 the firmware must be updated to use the HP 85721A personality Contact your HP sales office for more information about updating analyzer Ermware INVALID SYMTAB ENTRY SYMTAB OVERFLOW This error message indicates that there was not enough available analyzer memory To s...

Страница 154: ...ly from the RAM card follow the procedure in Deleting Individual Files from a RAM Card in Chapter 3 l To delete all the files from the RAM card follow the procedure in Deleting All the Files from a RAM Card in Chapter 3 MUST BE FIRST This message indicates that the last channel number entered for a range of channel numbers is less than the first channel number To solve this problem l Enter a chann...

Страница 155: ...A personality s ROM card into the memory card reader l If you want to store or recall data insert a RAM card into the memory card reader NO TEST PLAN SELECTED This message indicates that there is not a current test plan to test To solve this problem you need to create a test plan or recall a saved test plan l For information about creating a test plan see Creating a Test Plan in Chapter 3 l For in...

Страница 156: ...values for the cable TV analyzer functions Table 4 1 Ranges for the Cable TV System Monitor Functions ENTER TEMP Test number Channel number File number Range Up to seven digits long 9 9 9 t o 999 1 to 9 or 1 to 9 f o r deleting a test number 1 to 158 or 1 t o 1 5 8 for deleting a channel number 1 to 12 PLEASE SELECT A CHANNEL This message indicates that a channel was not selected before executing ...

Страница 157: ...1 Make sure that the printer is turned on 2 Make sure that the analyzer is connected to the printer correctly See Step 4 Install a printer in Chapter 1 for more information 3 For Option 021 only If you have both a computer and a printer connected to the analyzer you need do one of the following l Disconnect the computer from the analyzer l Send the BASIC commands ABORT 7 then send LOCAL 7 to the a...

Страница 158: ...insert a formatted RAM card If the RAM card needs to be formatted see Formatting a RAM Card in Chapter 3 RAM CARD IS NOT FORMATTED FORMAT RAM CARD AND TRY AGAIN This message indicates that the RAM card is unformatted To solve this problem l Format the RAM card as described in Formatting a RAM Card in Chapter 3 VIDEO SYNC NOT RECOGNIZED This message indicates that a TV line with horizontal sync cou...

Страница 159: ... is able to store files because the RAM card s memory is refreshed by a battery The battery needs to be replaced periodically or the RAM card can forget the files q Check that the battery in a 128 kilobyte RAM card has been replaced within the last year Check that the battery in a 32 kilobyte RAM card has been replaced within the 2 last years See the analyzer documentation for information about th...

Страница 160: ... data for a channel is missing and the test had been selected check that the test could be performed on the channel l For example if the test measures both the visual and aural carriers check that there is an aural carrier present q If the system composite second order CSO and composite triple beat CTB test data is missing ensure that YES was selected when the CSO and CTB testing prompt appeared T...

Страница 161: ...n 107 required tests q The input signal is too low to be measured l If the input signal is too low use a preamplifier to boost the input signal ensure that the voltage and power of the input signal does not exceed the specified input limits for the analyzer See Cable TV Measurement Specifications and Characteristics in Chapter 9 for more information about the minimum carrier level needed q The wro...

Страница 162: ...TE 2 If the time and date are not displayed in the upper left corner of the analyzer screen press TIMEDATE ON OFF so that ON is underlined 3 To reset the time press SET TIME enter the time in 24 hour format in the hour minute second format using the data keys then press C 1 For example entering 133010 corresponds 1 30 10 PM 4 To reset the date press SET DATE enter the date in the year month day fo...

Страница 163: ...ith your analyzer refer to the documentation for the analyzer about returning it for service If you need to contact Hewlett Packard for a problem with the HP 85721A personality you can call your nearest Hewlett Packard Sales and Service office listed in the following table 4 16 ...

Страница 164: ... d a 1217 Meyrin 27Geneva Zone D Activite De Courtaboeuf Switzerland F 91947 Les Ulis Cedex 141 221 780 8111 France 133 11 69 82 60 60 Germany Great Britain Hewlett Packard GmbH Hewlett Packard Ltd Hewlett Packard Strasse Eskdale Road Winnersh Triangle 61352 Bad Homburg v d H Wokingham Berkshire RG41 507 Germany England I49 61721 16 O 144 7341 696622 INTERCDN FIELD OPERATIONS Headquarters Australi...

Страница 165: ...I If You Have a Problem How to Contact Hewlett Packard ...

Страница 166: ...I 5 Channel Measurements Menu Map and Softkey Descriptions ...

Страница 167: ...ou ll This chapter contains the menu map and descriptions of the softkey functions used in channel measurements mode This chapter contains the following Find in This sections Chapter l channel measurements menu map l channel measurements softkey descriptions 5 2 ...

Страница 168: ...Channel Measurements Menu Map The following menu map shows all channel measurement mode softkeys and how they are accessed ...

Страница 169: ...3 M A I N M E N U L I S T E N O F F L I S T E N O F F L I S T E N A T M A R K E R L I S T E N A T M A R K E R D E M O D A M fi D E M O D A M fi 1 0 0 kHz R E S B W 1 0 0 kHz R E S B W 3 0 kHz R E S BW 3 0 kHz R E S BW M A I N M E N U M A I N M E N U N E X T C H A N N E L L S C R A M B L D Y E S O N F R E O O N O F F F R E O R S L N 1 0 IOOHr MAIbl M E N U pf79a Figure 5 1 Channel Measurements Main...

Страница 170: ...AIN MENU CONT NUE L I I L I ATTEN STEP UP ATTEN STEP ON INTGRTN RNG SET GO TO CSO CTB MAIN MENU CARRIER NOISE 1 IMAIN MENU r 1 L MAIN MENU CSO CTB FLD BOTH EVEN ODD LINE SEARCH GATE ON m AVERAGE ON elf ZOOM MEASURE NEXT BEAT L TV LINE STOP MEAS CTB STEP GOWN L MORE INFO Pre Menu TV LINE TOTL PWR INPUT TV TRIG ODD FL0 L MAIN MENU TV TRIG EVEN FL0 TV TRIG VERT INT Prev Men MORE INFO MAIN MENU r RETU...

Страница 171: ... Prev Menu 1 CENTER FREQ MARKER ON VITS TEST MARKER 1 MARKER 2 RESTART MAX HOLD L rSELECT LINE FIELD QDJ EVEN of AVERAGES AUTO SIG SERCH Select Test Sig I 1 MULTI BURST FCC COMPOSIT Select Test Sig NTC 7 CMBNTN NTC 7 COMPOSIT 5TH PKT YES NO DP TEST NTC FCC Prev Menu c L SELECT LINE FIELD QDJ EVEN AUTO SIG SERCH Select Test Sig y NuEl 1 MORE MAIN INFO FCC MENU r NTC i MARKER 2 MORE INFO COMPOS I T ...

Страница 172: ...Measurements Menu Map and Softkey Descriptions Channel Measurements Menu Map H O L D D S P L I N E O N O F F C h a n g e Title Limit L i n e s A N A L O G O N O F F MORE 1 OF 2 pf719a Figure 5 4 f i KF Menu 5 7 ...

Страница 173: ...nel Measurements Softkey Function De scriptions This section contains the descriptions of the channel measurements softkey functions The functions are listed alphabetically according to the softkey labels 5 8 ...

Страница 174: ...pan to show both the visual and aural carriers The visual carrier is positioned just below the reference level As an alternative to selecting T in Setup upstream T channels can be selected by entering negative channel numbers from any of the formats STD AIR HRC or IRC For example to select channel 7 enter 7 FM broadcast station frequencies can be tuned by selecting channels 201 through 300 These c...

Страница 175: ... channel number then press IENTER lower right hand hardkey See Figure 5 5 2 Up and down arrow keys Q1 and J select the next higher or lower channel number respectively 3 The current channel number appears next to the channel format at the top of the screen in the title line See Figure 5 6 CHANNEL 2 STDI REF 15 8 dBm AT 10 dB CENTER 57 000 MHZ SPAN 6 000 MHZ RES BW 30 kHZ 8W 30 kHZ SWP 20 0 msec LI...

Страница 176: ...ey Descriptions Channel Measurements Softkey Function Descriptions Hints 1 The visual carrier of a channel must be on before the CHANNEL SELECT function can correctly center the channel 2 Do not use the data knob for selecting channels 5 11 ...

Страница 177: ...block 1 Set up the desired measurement 2 Press DISPLAY then DSP LINE ON OFF to activate the display line to be used as the reference 3 Use the knob to position the display line 4 Press More 1 of 2 then DL DELTA ON OFF to activate the display line delta function 5 Position the display line delta using the knob 6 Read the percent change in the active function block Figure 5 7 shows the reference dis...

Страница 178: ...e the ability to view the DISPLAY LINE DELTA value when it is obscured by a video signal as in Figure 5 7 momentarily blank the active trace For example press Trace and then Blank A to view the value Then press Clear Write A to reactivate the trace When using the delta display line function if the active function control is transferred to some other function for example Amplitude or turned off wit...

Страница 179: ...RECALL FRM INT descriptions for more information about these functions 2 After the reference trace appears on screen press CONTINUE then press DO FRQ RESP TST 3 To align the frequency of the measurement trace with that of the reference trace press CENTER FREQ and use the a step up and 7J step down keys do not use the data knob to minimize amplitude ripple that may occur over the entire trace small...

Страница 180: ...ON MARKER MARKER OFF STOP TEST Figure 5 8 System Frequency Response 4 Pressing MARKER ON or MARKER DELTA assists the operator to End the peak to valley values using the marker For ease of use it is recommended to press SGLSWP hardkey before using these keys 5 Pressing CONTS SWEEP restarts the sweep after having pressed the i GZr hardkey 6 Pressing MARKER OFF turns the marker off 7 To stop the test...

Страница 181: ... not press DO FRQ RESP TST without first recalling the reference to trace B Using RECALL FRM INT automatically puts the trace into trace H Always press STOP TEST to exit the DO FRQ RESP TST function otherwise the display will be left in 2 dl3 per division and the traces will likely be off the bottom of the screen 5 16 ...

Страница 182: ...matically tunes to the selected channel 2 After selecting the desired measurement press GATE ON OFF to underline ON 3 The analyzer automatically searches for a quiet line lf the analyzer Ends a quiet line and if PAUSE YES NO in the Setup menu is set to NO the measurement is executed lf the analyzer hnds a quiet line and if PAUSE YES NO in the Setup menu is set to YES you must then press CONTINUE t...

Страница 183: ...averaging function to smooth the trace 6 In the carrier to noise measurement press INTGRTN RNG SET to position the two markers within the desired measurement range Rather than using a single measurement point the INTGRTN RNG SET softkey shows you to specify a range over which the measurement will be made This accounts for the non flatness of the noise floor 5 18 ...

Страница 184: ...The listen on function is available in analyzers with demodulation capability Option 102 The listen on function demodulates the aural carrier so that it is audible through the built in speaker Procedure 1 Select a channel then press LISTEN ON 2 Adjust volume with the front panel volume knob 3 Press LISTEN OFF to exit the function 5 19 ...

Страница 185: ... can also be recalled from a memory card using procedures provided in the analyzer user s guide Procedure 1 To recall a trace into trace B press RECALL FRM INT 2 After the message REGISTER appears enter the trace number the trace was stored under in SAVE TRB TO INT then press ENTER The trace is recalled to trace B in view mode It is complete when the message MAX REG 52 is added to the display as s...

Страница 186: ...g up to display the desired trace press SAVE TRB TO INT 2 The message ENTER O 5 or 11 THRU MAX REG appears Enter a trace register number between 0 and the MAX REG then press ZYKJ Note that registers 6 through 10 are used by the HP 85721A personality Therefore it is recommended not to use these registers to save the reference trace 3 Trace B is saved internally when the message TRACE B SAVED appear...

Страница 187: ...ry card utilizes the functions under the ISAVE_ key Refer to the analyzer user s guide for a description Hint When using this function to save reference traces be sure to record the trace register that each reference trace was saved under This precaution helps prevent restoring over useful reference traces and recalling the wrong register when using DO FRQ RESP TST 5 22 ...

Страница 188: ...er keys Main 1 of 3 Main 2 of 3 SYSTEM FRC RSP 2 Set the start and stop frequencies of the analyzer to include all channels being tested in the system l Press ENTER STRT FRQ then enter the lowest channel frequency l Press ENTER STOP FRQ then enter the highest channel frequency For your convenience when repeating this setup save this analyzer state for later recall 16 43 20 NO J 23 1993 m F 49 0 dB...

Страница 189: ...r at the 2 second default value l If SLOW SWEEP is pressed the analyzer sweeps at the s second default value During this setup step the analyzer converts the reference spectrum into a reference trace which connects the carrier peaks into a continuous line When the setup is finished the conditioned reference spectrum appears as shown in Figure 5 12 along with the message SETUP FINISHED SAVE THIS TR...

Страница 190: ... then press CENTER to store the reference spectrum and analyzer state in nonvolatile memory See the SAVE TRB TO INT function for more information about saving trace B Wait until the message TRACE B SAVED appears before proceeding See Figure 5 13 5 With a reference trace displayed on the analyzer press DO FRq RESP TST to begin the actual comparison test between the reference and the signals under t...

Страница 191: ...SWEEP is used for systems that do not have scrambled channels However the fast sweep is useful in making rough measurements and adjustments on systems with scrambled channels More accurate results can be obtained in a following test with the slow sweep 2 SLOW SWEEP allows the analyzer to measure the vertical sync pulse level when the horizontal sync pulse has been suppressed An H second sweep norm...

Страница 192: ...t Procedure Observe the co channel carrier in 10 kHz increments on either side of the main carrier by pressing the following analyzer keys VIEW INGRESS VIEW CO CHNL 03 29 56 JAN 12 1993 LT CHANNEL m STD EF 22 7 dBmV ATTEN 10 d6 EAK 06 j MKR n 10 00 kHz 37 79 d5 I 1 ENTER 67 23675 Hz SPAN 58 88 kliz RES SW 1 8 kHz WUBW i0 Hz SWP 15 8 set MhIN MENU Figure 5 14 View Co Channel 5 27 ...

Страница 193: ...I Channel Measurements Menu Map and Softkey Descriptions ...

Страница 194: ...6 System Measurements Menu Map and Softkey Descriptions ...

Страница 195: ...ou ll This chapter contains the menu map and descriptions of the softkey functions used in system measurements mode This chapter contains the following Find in This SectionS Chapter 0 system measurements menu map l system measurements softkey descriptions 6 2 I ...

Страница 196: ...System Measurements Menu Map The following menu maps are a graphic representation of all system measurement softkeys and how they are accessed 6 3 ...

Страница 197: ...ements Menu Map and Softkey Oescriptions System Measurements Menu Map Figure 6 l System Measurements Menu 1 of 2 The CHANBEL lEAS softkey menus are found in Chapter 5 t The Setup softkey menu is found in Chapter 7 6 4 ...

Страница 198: ...PORT LSTORE TO CARD Main Menu DATA TO PRINTER DATA TO SCREEN Prev Menu Recol I Dota NEXT PAGE PREV PAGE L System Measurements Menu Map and Softkey Descriptions System Measurements Menu Map VIEW CH SEL Prev Menu SAVE TO INT MEM B SAVE TO MEM CARD Prev Menu PLAN 1 PLAN 2 PLAN 3 PLAN 4 PLAN 5 DONE pi7150 Figure 6 2 System Measurements Menu 2 of 2 6 5 ...

Страница 199: ...ding to the softkey labels ABORT Description Allows you to stop the measurement It may take several seconds for the measurement to end after ABORT has been pressed ALL TESTS Description Allows you to select all tests for the currently selected channel Press CABLE TV ANALYZER SYSTEM MEAS More 1 of 2 Create TstPlan ENTER BY CHANNEL or ENTER BY RANGE YES or NO to access ALL TESTS 6 6 ...

Страница 200: ...red on a RAM card or a ROM card Figure 6 3 shows the catalog listing of a RAM card with test data files stored on it Table 6 l explains the different items in the catalog listing 16 47 28 NOU 2 REF 49 0 dBmV mm LOflO FILE OELETE FILE SELECT PREFIX lp ij START 54 8 NH2 STOP 425 8 MHz LRES BN 5 8 MHz UBW 1 MHz YSWP 8 08 set RT Figure 6 3 An Example of Cataloging a RAM Card 6 7 ...

Страница 201: ...ords times 256 bytes per record divided by 1024 bytes par kilobyte yields the size of the memory card in kilobytes This field describes the file type as follows AMP is for the amplitude correction factor file type OLP is for the downloadable program file type LIMIT is for the limit line file type STATE is for the instrument state file type end TRACE is for the trace data file type This is the RAM ...

Страница 202: ...t plan CLEAR TST PLAN clears the current test plan by removing the channel numbers and the tests for those channels from the current test plan CLEAR TST PLAN does not do any of the following l Delete any of the test plans that have been saved in analyzer memory plans 1 through 5 l Delete any of the test plans that have been saved on a RAM card l Delete the location code if one was entered l Delete...

Страница 203: ...accesses ENTER BY CHANNEL ENTER BY RANGE Save T Plan VIEW CH SEL and Prev Menu Pressing CABLE TV ANALYZER SYSTEM MEAS More 1 of 2 accesses Create T Plan DATA TO PRINTER Description Allows you to retrieve the test data from a RAM card lile and send it to a printer to be printed The printer needs to be connected to the analyzer Figure 6 4 shows an example printout l ble 6 2 explains the different it...

Страница 204: ...scriptions DATA FILE 5 PAGE II 1 HP 85721A CABLE TV MEASUREMENT SYSTEM OF MEASUREMENTS 11 24 93 TIME OF MEASUREMENT I 30 LOCATION CODE 930025 s ENTERED TEMPERATURE 70 r SERIAL NUMBER 103 TUNE CONFIG 8 Y P P TA FILE 5 PAGE tl 2 Channel Number 15 0 22 9 22 9 6 8 Figure 6 4 An Example Printout 6 1 1 ...

Страница 205: ... and is standard on the HP 85911 analyzer 6 The tune configuration 7 The results of the composite triple beat testing lif CTB testing was selected when the testing was performed 8 The file number of test data file 9 The tests 10 The test results An entry with a dash I indicates that the test was not performed 1 1 The channel number 1 2 The asterisk indicates that the channel was selected as a scra...

Страница 206: ...oftkey should not be confused with the DONE programming command DUMP TO PRINTER Description Allows you to have the test results sent to a printer when using Measure Now or Timed Measure The printer needs to be connected to the analyzer Figure 6 5 shows an example printout Table 6 3 explains the different items on a printout Press Measure Now Yes or No or Timed Measure to access DUMP TO PRINTER 6 1...

Страница 207: ...ERED TEMPERATURE 70 SERIAL NUMBER 103 OVEN REF YES 8 DATA FILE 5 PAGE d 2 TBSfS Channel Number I2 43 44 45 46 rVISVI5 Aur LYIFrea Lvl dBrn468 MHZ 26 555 9 6 61 31 1 12 6 67 32 14 6 4 32 7 77 14 8 32 14 5 8 I I 83 Au Freq M Hr 14 50003 25996 4 50009 24838 4 23996 50003 4 50004 25997 1 4 50004 26023 89 6 j 73 4 I 1 89 7 1 65 6 I I MOD DEPTH 7 HUM I 0 6 I 0 9 I l 1 2 I 0 7 3 l cso dB C N dl3 1 LN FLD...

Страница 208: ...nd is standard on the HP 8591C analyzer 6 The tune configuration 1 The results of the composite triple beat testing lif CTB testing was selected when the testing was performed 6 The file number of test data file 9 The tests 10 The test results An entry with a dash I indicates that the test was not performed 1 1 The channel number 1 2 The asterisk indicates that the channel was selected es a scramb...

Страница 209: ... it overwrites the Iile on the RAM card For Timed Measure Iile numbers begin with the number you enter and are automatically incremented with each measurement set Overwriting a file does not change the time and date entry shown when the RAM card is cataloged If you want the time and date to reflect when the new Iile was written to the RAM card you need to delete the existing file then save the new...

Страница 210: ...he following options are available l NEXT PAGE displays the next page of test results l PRBV PAGE displays the previous page of test results l GOT0 PAGE displays selected page number l PRINT REPORT prints a test results report l STORE TO CARD stores test results to a RAM card Press CABLE TV ANALYZER SYSTEM MEAS Measure Now Yes or No to access DUMP TO SCREEN See Also Step 6 Make the measurements no...

Страница 211: ...lude 2 through 134 Press CABLE TV ANALYZER SYSTEM MEAS More 1 of 2 Create TstPlan to access ENTER BY CHANNEL Sea Also Step 1 Select an individual channel in Chapter 3 ENTER BY RANGE Description Allows you to enter channels as a range of channel numbers Unlike ENTER BY CHANNEL you cannot use ENTER BY RANGE to edit or delete a channel A maximum of 158 channels channel numbers 0 2 through 158 can be ...

Страница 212: ...tion code was not previously entered a 0 On the RAM card the location code is stored in the test data hle The location code is printed when the test data is printed In analyzer memory the location code is not stored with the current test plan in plans 1 through 5 The location code is stored in nonvolatile analyzer memory however Storing the location code in nonvolatile memory means that once a loc...

Страница 213: ...previously entered or if a temperature reading was not previously entered a 0 On the RAM card the temperature entry is stored in the test data file The temperature entry is printed when the test data is printed In analyzer memory the temperature entry is not stored with the current test plan in plans 1 through 5 The temperature entry is stored in nonvolatile analyzer memory however Storing the tem...

Страница 214: ...ess More 1 of 2 VIEW LAST if a measurement was previously made See Also Step 6 Make the measurements now in Chapter 3 Main Menu Description Allows you to access the main menu of the system measurement mode The main menu contains the following softkeys ENTER LOCATION ENTER TEMP Recall TstPlan Measure Now Timed Measure Create TstPlan Recall Data CATALOG CARD VIEW LAST VIEW CH SEL The main menu of th...

Страница 215: ...essing Measure Now will display a screen that allows the option of selecting CTB testing Then the DUMP TO SCREEN DUMP TO PRINTER DUMP TO CARD and Main Menu softkeys are accessed Pressing CABLE TV ANALYZER SYSTEM MEAS accesses Measure Now Sea Also Step 3 Install a printer in Chapter 1 NEXT PAGE Description Allows you to select the next page of on screen test results Press CABLE TV ANALYZER SYSTEM M...

Страница 216: ...1 Description Allows you to select test plan 1 as the test plan number for either saving the current test plan or recalling a previously saved test plan Saving the current test Saving the current test plan overwrites any test plan previously saved in plan plan in plan 1 1 When you save the current test plan in test plan 1 it is stored in trace register 6 The channel numbers tests scrambling status...

Страница 217: ...y want to do the following l Enter the location code l Enter the temperature reading l Change the setting of the CTB testing in Setup menu l Change the setting of the external pad compensation in Setup menu Press CABLE TV ANALYZER SYSTEM MEAS More 1 of 2 Create TstPlan Save TstPlan then SAVE TO INT MEM to access PLAN 1 Or press CABLE TV ANALYZER SYSTEM MEAS Recall TstPlan RECALL FRM I T to access ...

Страница 218: ...register 8 PLAN 4 Description Allows you to select test plan 4 as the test plan number for either saving the current test plan or recalling a previously saved test plan The operation of PLAN 4 is identical to PLAN 1 except that the test plan is stored in and recalled from trace register 9 PLAN 5 Description Allows you to select test plan 5 as the test plan number for either saving the current test...

Страница 219: ...revious page of on screen test results Press CABLE TV ANALYZER SYSTEM MEAS Measure Now Yes or No DUMP TO SCREEN to access PREV PAGE Sea Also Step 6 Make the measurements now in Chapter 3 PRINT REPORT Description Allows you to print a report of the currently displayed test results Press CABLE TV ANALYZER SYSTEM MEAS Measure Now Yes or No DUMP TO SCREEN to access PRINT REPORT See Also Step 6 Make th...

Страница 220: ...reen Press CABLE TV ANALYZER SYSTEM MEAS More 1 of 2 to access Recall Data See Also Recalling Test Data from the RAM Card in Chapter 3 RECALL FRM CRD Description Allows you to recall a previously saved test plan from a RAM card Recalling a test plan overwrites the current test plan If you do not want the current test plan to be overwritten save the current test plan before recalling a test plan Pr...

Страница 221: ...channel numbers tests scrambling status channel tuning conEguration quiet line number frequency response line number test signal line number and Eeld selection are saved in the test plan The location code the temperature the selection of CTB testing and the setting for an external pad EXT PAD YES NO are not stored with the test plan but are stored in nonvolatile analyzer memory and are retained un...

Страница 222: ...M MEAS to access Recall TstPlan See Also Step 5 Recall a test plan in Chapter 3 Recalling a Test Plan from a RAM Card in Chapter 3 SAVE TO INT MEM Description Allows you to save the current test plan in analyzer memory Saving a test plan overwrites any previously saved test plan of the same test plan number Up to five test plans can be saved in analyzer memory The test plans are saved in nonvolati...

Страница 223: ...an accesses SAVE TO INT MEM See Also Step 3 Save the current test plan in internal memory in Chapter 3 SAVE TO MEM CRD Description Allows you to store the on screen test results to a RAM card Press CABLE TV ANALYZER SYSTEM MEAS Measure Now Yes or No DUMP TO SCREEN to access STORE TO CARD See Also Step 6 Make the measurements now in Chapter 3 Save TstPlan Description Allows you to access SAVE TO IN...

Страница 224: ...r than the current date the current date is used If the date or time setting of the analyzer is incorrect see If the wrong date or time is displayed in Chapter 4 Pressing CABLE TV ANALYZER SYSTEM MEAS Timed Measure accesses START TIME See Also Making Timed System Measurements in Chapter 3 STOP TIME Description Allows you to specify the time and the date to end the testing for a timed measurement T...

Страница 225: ... TstPlan Recall Data CATALOG CARD VIEW LAST and VIEW CR SEL Accessing the system measurement mode automatically changes the input impedance setting of a spectrum analyzer to 75 Q The setting of the input impedance is usually controlled by INPUT Z 50 75 For spectrum analyzer s with 50 62 impedance changing the input impedance with INPUT Z 50 75 minimizes the impedance mismatch but does not eliminat...

Страница 226: ...ss the functions that you can use to initiate the testing at a later time When you press Timed Measure you access a menu with the following softkeys START TIME STOP TIME TIME INTERVAL DUMP TO PRINTER DUMP TO RAM CARD and Main Menu Pressing CABLE TV ANALYZER SYSTEM MEAS accesses Timed Measure See Also Making Timed System Measurements in Chapter 3 6 33 ...

Страница 227: ...ou need to specify a time interval that is at least long enough to allow the analyzer to complete the testing before beginning testing again Here are some general guidelines for estimating how long it takes the analyzer to test one channel l It takes approximately 5 minutes to test a channel that is not scrambled with all of the tests selected for that channel l It takes approximately 2 minutes to...

Страница 228: ...ess TODAY S DATE as the start date for the timed measurement Press Timed Measure STOP TIME to access TODAY S DATE as the stop date for the timed measurement See Also Making Timed System Measurements in Chapter 3 TODAY S TIMEDATE Description Allows you to select the current time and date as the start time and date for timed measurements When you press TODAY S TIMEDATE the analyzer uses the time and...

Страница 229: ... view the last test results on the analyzer screen Upon being sent to the screen the following options are available l NEXT PAGE displays the next page of test results l PREV PAGE displays the previous page of test results l GOT0 PAGE displays selected page number l PRINT REPORT prints a test results report l STORE TO CARD stores test results to a RAM card Press CABLE TV ANALYZER SYSTEM MEAS More ...

Страница 230: ... selected to clear the current test plan from analyzer memory If you enter a channel by using ENTER BY CHANNEL or ENTER BY RANGE and then press YES the channel or range of channels will be treated as scrambled channels If you press Measure Now and then press YES CTB testing will be performed YES is accessed by pressing CLEAR TST PLAN or entering a channel number with ENTER BY CHANNEL or ENTER 3Y R...

Страница 231: ...System Measurements Menu Map and Softkey Descriptions System Measurements Softkey Function Descriptions ...

Страница 232: ...I 7 TV Receiver Setup and AUX CTRL Menu Maps and Softkey Descriptions ...

Страница 233: ......

Страница 234: ...IVER Menu Map The following menu map shows the TV receiver softkeys and how they are accessed SPECTRUM ANALYZER CABLE TV ANALYZER TV RECEIVER PIX SND ON E More 1 of 3 pf718a Figure 7 1 TV RECEIVER Menu Map 7 3 ...

Страница 235: ...accessed setup CHANNEL MEA5 SYSTEM MEAS I CTB FREO OFFSET I Pre Men Figure 7 2 Setup Configuration Menu Map The CHANNEL MEAS SYSTEM MEAS softkey menus are found in Chapters 5 and 6 respectively t These softkeys only appear when EXT AMP YES 10 is set to YES t Only appears with 5OQ input analyzers 7 4 ...

Страница 236: ...llowing menu map shows the TV receiver softkeys found under the AUXCTRL front panel hardkey AUX 0 CTRL Demod Track Gen Aux Corm Control Monitor TV c CHANNEL SELECT PICTURE ON OFF SOUND ON OFF pf717o Figure 7 3 AUX Menu Map 7 5 ...

Страница 237: ... frequency assignments are defined in the Federal Communications Commission s FCC channel identification plan part 76 612 If you do not select a tune conEguration the default tune conEguration is the standard STD configuration The choices for the tune configuration are standard STD off the air AIR incrementally related carriers IRC harmonically related carriers HRC and T format The analyzer retain...

Страница 238: ...or amplitude loss caused by an external pad An external preamplifier or the internal preamplifier in HP 8591C analyzer is used for the carrier to noise test The external pad and preampliEer settings are stored in non volatile analyzer memory This means that the analyzer retains the selection even when power is turned off until a new selection is made The TDTL PWR 8 INPUT measures the total input p...

Страница 239: ...7 required Press TV RECEIVER or press CTRL Monitor TV to access CHANNEL SELECT See Also Step 5 Access the TV receiver mode in Chapter 2 Channel Tuning Description Allows you to select the channel tuning configuration for the channels in the test plan The channel tuning conEgurations that can be selected are as follows STD For a standard channel format AIR For off the air channel format IRC For inc...

Страница 240: ...ed off until a new selection is made Press CABLE TV ANALYZER Setup to access Channel Tuning See Also Step 1 Configure the test system in Chapter 2 CSO FREQ OFFSET andCTB FREQ OFFSET Description Allows you to specify the location above or below a visual carrier to measure system CSO and system CTB The defaults are channel 4 CTB 6 MHz above the visual carrier and CSO 4 75 MHz above the visual carrie...

Страница 241: ...ection is made Press CABLE TV ANALYZER Setup Analyzer Input to access EXT AMP GAIN See Also Step 1 Configure the test system in Chapter 2 EXT AMP NZ FIG Description Allows you to select the noise figure value of an external preamplifier for the carrier to noise test The default value is 7 dB for the HP 85905A preamplifier The preamplifier selection is stored in nonvolatile analyzer memory This mea...

Страница 242: ... PAD YES NO Description EXT PAD YES NO can be used to compensate for the amplitude loss caused by using a 50 D to 75 61 external matching pad A 50 Q to 75 D external matching pad is used to match the signal from a 75 61 impedance system to a spectrum analyzer with a 50 62 impedance input The external pad function compensates for the 5 8 dB amplitude loss of the external pad by setting the spectrum...

Страница 243: ... EXT PAD YES NO See Also Step 2 Connect the signal to the analyzer in Chapter 2 HRC Description Allows you to select the harmonically related carriers HRC tune configuration HRC is the channel tuning configuration in which the frequency of each video carrier is a multiple of 6 MHz If you do not select a channel tuning configuration the default configuration is the standard STD conEguration The cho...

Страница 244: ...rementally related carriers IRC harmonically related carriers HRC and T format The analyzer retains the channel tuning configuration selection even when power is turned off until a new selection is made Press CABLE TV ANALYZER Setup Channel Tuning to access IRC See Also Step 1 Configure the test system in Chapter 2 Monitor TV Description Allows you to access the TV receiver mode This feature is th...

Страница 245: ...ON OFF See Also Step 5 Access the TV receiver mode in Chapter 2 See Also PIX SND ON OFF Description Allows you to view the TV picture and listen to the sound simultaneously This feature allows you to quickly identify picture quality problems such as noise distortion hum and ingress Select a channel by pressing CHANNEL SELECT entering a TV channel number then pressing PIX tSND ON OFF To exit this m...

Страница 246: ...ent conEguration softkeys include GATING YES NO and PAUSE YES NO These softkey functions apply to channel measurement CHANNEL MEAS mode only The System 3eats softkey is used to specify the channel you wish to use for testing beats The default measurement frequency for CTB is 6 MHz above the visual carrier the default measurement frequency for CSO is 4 75 MHz above the visual carrier These values c...

Страница 247: ...iption Allows you to select the standard STD channel tuning configuration If you do not select a channel configuration the default configuration is the standard STD configuration The choices for the channel tuning configuration are standard STD off the air AIR incrementally related carriers IRC harmonically related carriers HRC and T format The analyzer retains the channel tuning configuration sel...

Страница 248: ...will be measured in the channel specified by SYS BTS TST CHNL The results are displayed on the first page of the measurement data System beats testing is selected independently of the test plan and is not stored with the test plan The analyzer retains the channel selection even when power is turned off until a new selection is made Pressing CABLE TV ANALYZER Setup System Beats accesses SYS BTS TST...

Страница 249: ...l carrier the default measurement frequency for CSO is 4 75 MHz above the visual carrier These values can be changed using CT3 FREQ OFFSET and CSO FREQ OFFSET These settings are stored in nonvolatile analyzer memory This means that the analyzer retains the selections even when power is turned off until a new selection is made Press CABLE TV ANALYZER Setup to access System Beats See Also Descriptio...

Страница 250: ...ration is the standard STD configuration The choices for the channel tuning configuration are standard STD off the air AIR incrementally related carriers IRC harmonically related carriers HRC and T upstream format The channel tuning configuration selection is selected independently of the test plan and is not stored with the test plan The analyzer retains the channel tuning configuration selection...

Страница 251: ...nction can also be used in conjunction with an external preamplifier By measuring the total input power you ensure that the preamplifier s specifications are not exceeded which could contribute to distortion products when measuring CSOKTB Press CABLE TV ANALYZER Setup Analyzer Input to access TOTL PWR 0 INPUT See Also Step 1 Configure the test system in Chapter 2 TV RECEIVER Description Allows you...

Страница 252: ... until a new setting is made Press CABLE TV ANALYZER Setup Channel Tuning to access CHNL 0 CNTR FRq See Also Step 1 Configure the test system in Chapter 2 USR CH 0 SPAN Description Allows you to define the span for a user defined channel This channel is then accessed by selecting channel 0 zero The setting defined here is stored in nonvolatile analyzer memory This means that the analyzer retains t...

Страница 253: ...I TV Receiver Setup and AUX CTRL Menu Maps and Softkey Descriptions Softkey Descriptions ...

Страница 254: ...I 8 Test Descriptions ...

Страница 255: ...carrier to noise test l composite second order CSO test l composite triple beat CTB test l hum test l depth of modulation test l digital channel power test l color tests chroma luma delay inequality differential gain differential phase l in channel frequency response test l FM deviation test l cross modulation test 0 system frequency response test 0 view ingress test l view co channel test N O T E...

Страница 256: ...ure the levels accurately 2 Measures the visual amplitude level and aural carrier difference Figure 8 1 shows the analyzer measuring the visual carrier level and aural carrier difference 16 34 36 DEC 86 1993 CHANNEL 8 STO MKR 55 275 MHz REf 34 4 dSmV b AT i0 dB 34 59 dErV NEXT PERK CHANNEL LOG i I SCRRMGLO YES NQ FREQ ON m CENTER 57 888 MHz SPAN 6 888 NHz YRES GW 388 kHz WVBW 3 MHz WSWP 38 8 nsec ...

Страница 257: ...visual carrier to be detected as the aural carrier If the aural carrier cannot be detected the visual to aural frequency difference measurement cannot be done and a I will appear in the system measurement test data for the channel The SCBAMBLD YES NO softkey when set to YES does a max hold function to catch and hold the values in non suppressed sync tips 8 4 ...

Страница 258: ...owing 1 Enables counting of the visual and aural carriers and calculates the aural carrier difference 2 In channel measurement mode the frequency counter resolution can be changed to 10 Hz without affecting measurement accuracy Refer to the specifications in the HP 8591C Calibration Guide Figure 8 2 shows the analyzer measuring the visual and aural carriers 16 35 22 OEC 06 1993 CHANNEL m STO CNTR ...

Страница 259: ...ption The aural carrier needs to be within 4 5 MHz 0 4 MHz of the visual carrier to be detected as the aural carrier If the aural carrier cannot be detected the visual to aural frequency difference measurement cannot be done and a will appear in the system measurement test data for the channel 8 6 ...

Страница 260: ... continuously updates and reports the carrier to noise ratio for the marker position The marker can be moved as desired and the result is updated to reflect the most current test result At the end of each sweep the marker does a local minimum search as well as a local trace average Before executing the test the analyzer initially measures the total power of the entire cable system This is done to ...

Страница 261: ...subtracted from the carrier peak level The ratio is then normalized to a 4 MHz noise power bandwidth The message See MORE INFO is displayed if the system noise is within 3 dB of the analyzer noise This can be the case when carrier to noise is 50 dB and carrier levels are less than 20 dBmV Refer to the graphs in the speciEcations located in the HP 8591C Calibration Guide N O T E External preamplifi...

Страница 262: ...ement In channel measurement mode pressing More MORE INFO shows the raw data and all corrections used for this measurement 15 38 28 JAN 25 1995 P REF 3 0 dBmV AT 10 dB EUN C N CALCULATION Uncorrected marker on noise w8 z Correct to measurement BW 21 25 18 23 LOG detect Noise t2 58 15 73 IF Noise Equlv Pwr BW l 8 52 16 25 Analyzer Noise Correction 1 76 18 81 Ext Preamp Noise Correction G 17 18 18 C...

Страница 263: ...quiet line In h c annel measurement mode the CONTINUE softkey is then pressed to execute the measurement The analyzer displays the in channel noise measured only during the quiet line The minimum level noise is not found Instead noise can be measured over a range to account for possible non flatness of the noise floor FCC 76 609 e requires a noise integration be made over the full range if the noi...

Страница 264: ...st This is necessary when the noise floor being measured is less than the analyzer noise floor when the total input power is near overload The only way to raise the noise floor without overloading the analyzer is to reduce channel loading through preselection When CARRIER NOISE is pressed the analyzer measures the total power at the input the level of the channel to be measured and the analyzer no...

Страница 265: ...hen it may be possible to reduce the input power a small amount but just enough to cause the analyzer to switch its internal 10 dH attenuator down by 1 step This has the effect of raising the input level by 10 dH less the number of dH the input level was reduced by Try this when raising the level is inconvenient or impossible for some reason Alternatively when this message appears it signals that ...

Страница 266: ...is only turned on at levels low enough to prevent overload Under some conditions the internal attenuator is set to 10 dB to prevent preamplifier overload When the internal preamplifier is turned on a message to that effect is displayed at the lower right hand corner of the screen The carrier to noise test has 2 variations The first is the traditional method where the video modulation is either lef...

Страница 267: ...and converters if used To move from the non gated to the gated test press CONTINUE Now depending on the setting of PAUSE and option 107 being present the test will either stop with line 12 displayed or move directly into the gated C N test When PAUSE is set to YES line 12 is displayed giving you the opportunity to explore the vertical interval by changing the line and field values A different line...

Страница 268: ... is necessary when measuring with a video signal present because the noise floor is very often not flat Therefore measuring at a single point and converting to a 4 MHz bandwidth can give incorrect results The FCC rules stipulate that when the noise floor is not flat that it must be integrated or summed The gated carrier to noise test integrates over as wide a range as it can It defaults to 85 of t...

Страница 269: ...e trace is a time averaged display appropriate for measuring beats The marker does a local peak search to assure it is measuring the peak of the beat 2 CSD using Bating function With the Option 107 installed the carrier modulation does not have to be turned off After initiating the CSOKTB test and after the gate function has been selected with the GATE ON OFF key a quiet line horizontal line witho...

Страница 270: ...he channel specified using the SYS BTS TST CHML softkey in the Setup menu This applies to the system measurements mode The system CSO test measures the beat product at an offset from the test channel set by CSO FREQ OFFSET The default for CSO FBECj OFFSET is 4 75 MHz This can be set to 7 25 when measuring higher channel numbers Figure 8 5 shows the analyzer measuring the level of the beat product ...

Страница 271: ... that align in frequency with the carrier under test System CTB testing is intended to be performed on only one channel and is performed at an offset from the channel specified using the SYS BTS TST CHNL softkey in the Setup menu The offset is specified by CTB FREQ OFFSET the default value is 6 MHz Setting CTB FEEQ OFFSET to 6 MHz will allow testing 6 MHz below the beats test channels The default ...

Страница 272: ...eat products the analyzer center frequency is changed so that level of the test channel any beat products in the gap between channels 4 and 5 can be measured To is measured avoid measuring the skirts of the visual carrier the resolution bandwidth and frequency span of the analyzer are decreased To optimize the distortion measurement capability of the analyzers the reference level is decreased to b...

Страница 273: ...eedback messages to assist you in achieving the optimum test setup Like any cable TV active device a spectrum analyzer has an ideal operating point which balances C N and C Beats When a spectrum analyzer is operating at its optimum point it has its greatest testing dynamic range However to achieve acceptable results it is not always necessary to operate the spectrum analyzer exactly at its optimum...

Страница 274: ...esence of message See MORE INFO in the lower right hand corner of the screen This message occurs when the cable noise floor is within 3 dB or the analyzer noise floor It is intended to alert the operator that the analyzer signal near noise correction is kicking in In addition the message is presented in inverse video when the cable noise floor is within 2 2 dB of the analyzer noise This indicates ...

Страница 275: ...toy dB This message may appear as an alternative to raising the input level It appears when it may be possible to reduce the input power a small amount but just enough to cause the analyzer to switch its internal 10 dB attenuator down by 1 step This has the effect of raising the input level by 10 dB less the number of dB the input level was reduced by Try this when raising the level is inconvenien...

Страница 276: ...to YES are the best settings for initially becoming familiar with carrier to beats test GATING set to NO causes the carrier to beats test to initially enter the first variation of the test as described above At this point you can observe the 1 25 MHz beat at the lower channel boundary To move from the non gated to the gated test press CONTINUE Now depending on the setting of PAUSE and option 107 b...

Страница 277: ...re 8 6 When the video bandwidth is set to 1 MHz signiEcant noise is also present This noise is digitally minimized then several peak to peak measurements are taken and averaged Using the average of these measurements gives the best consistency with visual oscilloscope measurements However the effects of noise cannot be completely eliminated and the results reported have slightly more uncertainty u...

Страница 278: ...be under the 3 percent limit Low frequency disturbances on channels above the limit are often a combination of video Eeld time distortion on the received signal and cable system hum The dominant contributor may be identified by removing the signal input to the headend inserting a clean carrier wave signal on that input and retesting More than 3 percent Eeld time distortion on off air signals has b...

Страница 279: ...RE CORR INFO MAIN MENU ENTER 67 235 MHz RES BW 1 0 MHz XVBW 1 MHz SPAN 0 HZ SWP 30 0 mSec Figure 8 6 HUM Video Modulation On 16 58 49 NOU 23 1993 kt F 37 7 dBmV MKR d 35 375 lnsec hT 10 dB 04 dB PEAK 0 o LOG iB MAIN MENU ENTER 55 233 ilHz SPAN 0 Hz WRES BW 1 0 MHz WUBW 1 kHz XSWP 58 8 nsec R Figure 8 7 HUM Video Modulation OFF 8 2 6 ...

Страница 280: ...iptions Hum Test Description lG E4133 OEC 13 1993 CHANNEL m STD REF 35 3 dBmV AT 10 dB MKR A 128 Hz 53 70 dB CENTER 67 248 BHz SPAN 8 HZ YRES BW I 8 MHz YVBW 1 MHz YSWP 888 mrec Figure 8 8 HUM More Information 8 27 ...

Страница 281: ...ntrol line A of the analyzer auxiliary interface to determine when the analyzer is testing a scrambled channel When testing a scrambled channel the control A line fpin 11 of the analyzer auxiliary interface is set high in transistor to transistor logic ITTL To perform the depth of modulation measurement the analyzer does the following 1 Changes the center frequency and reference level of the analy...

Страница 282: ...erval test signal VITS white level and the maximum level corresponds to the horizontal synchronization pulse H sync level The ratio of the minimum level the VITS white level to the maximum level the H sync pulse level subtracted from a value of 1 and multiplied by 100 gives the percentage of modulation l minimum x 100 AM m a x i m u m 1 Figure 2 27 shows the analyzer measuring the minimum and maxi...

Страница 283: ...he peak of the signal falls approximately 10 to 20 dB below the top of the display Refer to the digital channel power test description in the channel measurement section for operating instructions 16 35 27 SEP 12 1996 CtiANNELmm STD REF 29 3 dBmV hT i0 dB WAse SCFC CORR mm SYSTEM FRQ RSP IN CHNL FRQ RSP DIF GAIN DIF PHAZ CL01 DIGITAL CH POWER Ma1n 3 of 3 1 CENTER 314 88 flHz SPAN 8 68 RHz RES GW 1...

Страница 284: ...y Adjustment of VBW or RBW may degrade measurement performance The following steps are performed to determine channel power The logarithmic trace is converted to linear units volts and the RMS average is computed The value is then converted back to logarithmic measurement units The power result is then normalized to a power spectral density in a 1 Hz bandwidth and scaled to the desired channel ban...

Страница 285: ... 41 38 SEP 12 1996 NKR 317 58 MHz AT 10 dE 29 53 dBmVMRRKER 1 1 pou r between CHhNNEL POWER dBmV markers STOP 318 88 NHz RES GW 1GG kHz WUGW 1 MHz SWP 28 8 nsec RT MflIN MENU Y OF fiVERAGES Figure E 11 Results of Digital Channel Power Test NARKER 2 RUERhGE u Off 8 32 ...

Страница 286: ...ferent results due to their point of origin 3 Commercial insertion equipment may cause test signals to not be transmitted If this occurs during a test the results will not be valid 4 Visual signal levels greater than 20 dBmV will provide best results 5 Non standard timing in signal composition may not yield specified accuracy 6 Large amounts of non linear distortion group delay or ghosting may yie...

Страница 287: ... Slg Y I I 1 j k I j CONTINUE I C E N T E R 6 7 2 4 9 Mtiz S P A N 0 HZ ORES BW 3 0 0 ktiz d BW 3 M H Z SWP 80 lJsec Figure 8 12 FCC Composite Test Signal 1 2 2 3 2 3 N O 2 3 4P 1993 R E F 1 1 9 5 mV AT 10 dB TV LIN WA SB S C T C CORR III I I I I I III I I FIELD 0 0 0 EVEN A U T O S I G S E A R C H 1 I I I 1 1 I II C O N T I N U E C E N T E R 6 3 000 MHZ RES BW 3 0 0 CHL VBW 3 MHZ S P A N 0 Hz SWP...

Страница 288: ... pulse has a half amplitude duration of 250 ns for NTSC 12 5T pulse has a half amplitude duration of 1 5625 ps The chromakuna delay inequality test measures the time delay between the low frequency luminance component and the high frequency chrominance component of the 12 5T modulated pulse in the composite test signal Refer to Figure 8 14 15 29 12 MAR 86 1995 v CHRNNEL m STO REF 26 46 I J AT i0 d...

Страница 289: ...e chrominance component and performs video averaging The center of the chrominance component is found and converted to time The time difference between the two components is then computed Since the analyzer measures absolute time an offset of 170 ns is added to the result so that it will agree with tests done using a demodulator with sound trap in 170 ns of delay and the result will be shown relat...

Страница 290: ...erence burst Averaging is employed to minimize noise contribution to the reading The peak to peak amplitude of the largest riser step is found Then the riser step with the smallest peak to peak amplitude is found The difference between the two amplitudes is computed and expressed as a percentage of the largest amplitude Differential gain calculation where max largest packet value in and min smalle...

Страница 291: ...finitions for this test For the NTC definition the largest phase difference between any two riser steps including the reference is calculated and displayed For the FCC NCTA definition the largest phase difference between the reference and any riser step is calculated and displayed If 5th PKT YES NO is set to NO then the calculation is based on the first four steps in the five step riser in channel...

Страница 292: ...ntial Gain Differential Phase 15 29 12 MAR 06 1995 CHRNNEL e ST01 EF 26 46 IV AT 10 dB 1 REF 1 2 13 14 TART 183 000 RHz I I RES BW STOP 300 kHz 183 000 IIH YUBW 3 flHz OSYP 28 ps c A B a I1111 F _ NEll l MORE INFO MAIN MENU L Figure g 15 Differential Gain Differential Phase 8 3 9 ...

Страница 293: ...i burst Note that the 0 5 MHz burst packet cannot be resolved in a resolution bandwidth of 300 kHz However 300 kHz is the minimum bandwidth required for the analyzer to accurately measure burst packets greater than 4 25 ps If all the burst packets were the same time duration a resolution bandwidth of 100 kHz could be used The burst height would not be accurate but they all have the same relative a...

Страница 294: ...interest The sin X X is also a continuous signal in the frequency domain when using 100 kHz resolution bandwidth for detection Its lower energy content requires higher signal levels or averaging to be used to get equivalent results to the GCR Multiburst can be used but it does not provide a continuous display across the channel as does GCR and sin X X The NTC 7 combination signal is the least idea...

Страница 295: ...his occurs during a test the results will not be valid 4 Visual signal levels greater than 20 dBmV will provide best results 5 Non standard timing in signal composition may not yield specified accuracy Surveying your system for test signal types and locations for each channel will simplify test plan generation Blank charts are located in Chapter 9 Copy these charts and hll in appropriate informati...

Страница 296: ...ximum and minimum deviations are held for the number of sweeps set in CYCLES MSMT The peak to peak result is calculated then divided by 2 to get peak deviation If a test signal were used the peak deviation could be measured in one sweep Live audio is normally used with CYCLESIMSMT set to 25 or more to ensure that peak deviations are found and results are consistent The peak FM deviation result is ...

Страница 297: ... 16 56 38 DEC 66 1993 CENTER 433 258 NH2 SPAN B HZ YRES BW 100 kHz YUBW 100 kHz HSWP 20 0 rnEIC NRIN MENU RT Figure 8 18 Cross Modulation Modulation must be turned off in order to perform this test The analyzer is tuned to the carrier frequency and put in zero span A fast fourier transform is performed on the signal and the magnitude of the 15 7 kHz incidental modulation is measured relative to th...

Страница 298: ...two points are compared that have greater than 8 dB gain difference the reference level can be adjusted to position the trace on the display The system frequency response test measures cable TV distribution system flatness without the need for a sweep generator or other signal source This measurement technique does not require shutting down the system does not interfere with any signals on the sys...

Страница 299: ... marker so that you can position it on the unwanted signal The LISTEN AT MKR function allows you to listen to the signal to help determine the source Note that this test is only available in Channel mode 17 83 58 DEC 86 1993 CHRNNEL pl s O dB REF 36 8 dBm MKR a 3 880 MHz 60 39 dB SMPL 1 I CEHTER 177 808 MHz SPAN 6 888 nH2 YRES BW 100 kHz WUBW i kHz SWP 138 nlsec eEol0 VIEW CO CNNL LISTEN hT MKR 18...

Страница 300: ...hannel level is high enough the TV receiver will display two separate signals on one channel Note that this test is only available in Channel mode 83129 56 JAN 12 1993 7 CHhNNEL m ST01 REF 22 7 dBmU ATTEN 10 dB MKR 0 lG 00 kHz m 37 73 dB MARKER A 10 00 kHz A I 37 79 dB MRIN MENU CENTER 67 23675 NHz SPAN 58 88 kHZ RES BW 1 B kHz JEW 18 Hz SWP 15 8 set Figure E 20 View Co Channel 8 47 ...

Страница 301: ...Test Descriptions View Co Channel Test Description ...

Страница 302: ...9 Specifications and Test Aids ...

Страница 303: ...f the HP 85721A Find in This cable TV measurements and system monitor personality with supported Chapter analyzers In addition test aids are provided This chapter contains the following sections l cable TV measurement speciEcations and characteristics l channel identiEcation plans l channel survey map 9 2 ...

Страница 304: ...nalyzer 75 fI Spectrum Analyzer 50 f2 Spectrum Analyzer 50 fI Spectrum Analyzer Selections HP 8590 Series Option 711 Ext Pad No Ext Pad No selection required Measurements converted to 75 n values Amplitude offset set to 5 8 dB Amplitude offset set to zero Channel Selection Tune Configuration Channel Range Channel Frequencies Frequency Range Amplitude Range Analyzer tunes to specified channels base...

Страница 305: ...ency Difference Difference Range Resolution Accuracy Frequency difference between visual end aural carriers is counted 4 1 to 4 9 MHz 1 0 0 Hz f221 Hz for precision frequency ref lstdt f254 Hz for Option 704 frequency ref Visual Carrier Level Amplitude Range Resolution Absolute Accuracy Relative Accuracy The peek amplitude of the visual carrier is measured to en absolute standard traceable to the ...

Страница 306: ... Accuracy Power line frequency and low frequency disturbance measured on modulated and or unmodulated carriers May not be valid for scrambled channels 0 5 t o 1 0 0 1 1tO 4 f o r h u m 13 1tO 7 f o r h u m 55 f1 3 f o r h u m 510 Visual Carrier to Noise Ratio C N Optimum Input Range Maximum C N Range C N Resolution C N Accuracy The C N is calculated from the visual carrier peak level end the minim...

Страница 307: ...6 to 73 dB over optimum input range 0 1 dB 1 dB Input level end measured CSOKTB dependent See graphs f1 5 dB to f4 0 dB over optimum input range A preamplifier end preselector filter may be required to achieve specifications tOptimum input range is determined et the time of measurement since a total input power measurement is first done to automatically set the attenuator C N CSO and CTB Measureme...

Страница 308: ... out Of Measvrement Range Crossmodulation Range Resolution Accuracy I Horizontal line 115 7 kHz related AM is measured on the unmodulated visual carrier 60 dB u s a b l e t o 6 5 dB 0 1 dB 42 0 dB f o r x m o d 40 dB C N 40 dB 312 6 dB f o r x m o d 50 dB C N 40 dB 314 6 dB f o r x m o d 60 dB C N 40 dB 9 7 ...

Страница 309: ...ep Time Reference Trace Storage 2 s default1 for no scrambling 8 s default for fixed amplitude scrambling 50 traces that include analyzer states requency Response Test Range Resolution Trace flatness Accuracy Trace Position Accuracy 1 0 dB Div t o 2 0 dB Oiv 12 dB default1 0 0 5 dB 50 1 dB per dB deviation from a flat line and 310 75 dB maximum cumulative error 0 0 dB for equal temperature at test...

Страница 310: ... 50 averages default1 4 4 50 averages ldefaultl 3O f45ns 50 MHz to 850 MHz lO dBmV t o 50 dBmV a t c o u p l e r i n p u t 110 dB loss1 Insertion loss 2 dB C o u p l e d o u t p u t 9 dB 1L0 5 dB Non Interfering Tests with Gate On In channel Frequency Response Accuracy within channel See graphs for eccuracyt f0 5 dB within channel IHP 8591C only1 f 0 7 5 dB 185 M H z I H P 8 5 9 0 E Series1 f 0 5 ...

Страница 311: ...quency Band MHz 2 54 60 3 60 66 4 66 72 5 76 82 6 82 88 7 174 180 8 180 166 9 186 192 10 192 198 1 1 196 204 1 2 204 210 13 210 216 14 470 476 15 476 482 16 482 488 17 488 494 18 494 500 19 500 506 20 506 512 21 512 518 22 518 524 23 524 530 24 530 536 25 536 542 26 542 548 27 548 554 28 554 560 29 560 566 30 566 572 9 10 ...

Страница 312: ...cy Band MHz 31 572 570 32 578 584 33 584 590 34 590 596 35 596 602 36 602 608 37 608 614 38 614620 39 620 626 40 626 632 41 632 638 42 638 644 43 644 650 44 650 656 45 656 662 46 662 668 47 668 674 48 674 680 49 680 686 50 686 692 51 692 698 52 698 704 53 704 710 54 710 716 55 716 722 56 722 720 57 726 734 58 734 740 59 740 746 60 746 752 61 752 758 62 758 764 9 11 ...

Страница 313: ...ds Channel Identification Plans Table 9 l FCC Numerical Designation of Television Channels Section 73 603 continued Channel Number Frequency Band MHz 63 764 770 64 770 776 65 776 782 66 782 766 67 788 794 66 794800 69 600 606 9 12 ...

Страница 314: ...25 223 25 223 2625 235 2625 241 2625 247 2625 253 2625 MHZ H R C 72 0036 54 0027 60 0030 66 0033 78 0039 84 0042 174 0087 180 0090 186 0093 192 0096 198 0099 204 0102 210 0105 120 0060 126 0063 132 0066 138 0069 144 0072 150 0075 156 0078 162 0081 168 0084 216 0108 222 0111 228 0114 234 0117 240 0120 246 0123 252 0126 IRC 73 2625 55 2625 61 2625 67 2625 79 2625 85 2625 175 2625 181 2625 187 2625 1...

Страница 315: ...7 301 2625 300 0150 301 2625 X 38 307 2625 306 0153 307 2625 Y 39 313 2625 312 0156 313 2625 2 40 319 2625 318 0159 319 2625 DO 41 325 2625 324 0162 325 2625 EE 42 331 2750 330 0165 331 2750 FF 43 337 2625 336 0168 337 2625 G G 44 343 2625 342 0171 343 2625 H H 45 349 2625 348 0174 349 2625 II 46 355 2625 354 0177 355 2625 JJ 47 361 2625 360 0180 361 2625 KK 48 367 2625 366 0183 367 2625 LL 49 373...

Страница 316: ...92 0246 498 0249 504 0252 510 0255 516 0258 522 0261 528 0264 534 0267 540 0270 546 0273 552 0276 558 0279 564 0282 570 0285 ST0 415 25 421 25 427 25 433 25 439 25 445 25 451 25 457 25 463 25 469 25 475 25 481 25 487 25 493 25 499 25 505 25 511 25 517 25 523 25 529 25 535 25 541 25 547 25 553 25 559 25 565 25 571 25 IRC 415 2625 421 2625 427 2625 433 2625 439 2625 445 2625 451 2625 457 2625 463 26...

Страница 317: ...3 2500 679 2500 685 2500 691 2500 697 2500 703 2500 709 2500 MHz H R C 576 0288 582 0291 588 0294 594 0297 600 0300 606 0303 612 0306 618 0309 624 0312 630 0315 636 0318 642 0321 90 0045 96 0048 102 0051 108 0250 114 0250 648 0324 654 0327 660 0330 666 0333 672 0336 678 0339 684 0342 690 0345 696 0348 702 0351 708 0354 T IRC 577 2625 583 2625 589 2625 595 2625 601 2625 607 2625 613 2625 619 2625 6...

Страница 318: ...500 811 2500 817 2500 823 2500 829 2500 835 2500 841 2500 847 2500 853 2500 859 2500 865 2500 871 2500 877 2500 883 2500 MHz H R C 714 0357 720 0360 726 0363 732 0366 738 0369 744 0372 750 0375 756 0378 762 0381 768 0384 774 0387 780 0390 786 0393 792 0396 798 0399 804 0402 810 0405 816 0408 822 041 I 828 0414 834 0417 840 0420 846 0423 852 0426 858 0429 864 0432 870 0435 876 0438 882 0441 IRC 715...

Страница 319: ...00 913 2500 919 2500 925 2500 931 2500 937 2500 943 2500 949 2500 955 2500 961 2500 967 2500 973 2500 979 2500 985 2500 991 2500 997 2500 MHz H R C 888 0444 894 0447 900 0450 906 0453 912 0456 918 0459 924 0462 930 0465 936 0468 942 0471 948 0474 954 0477 960 0480 966 0483 972 0486 978 0489 984 0492 990 0495 996 0498 IRC 889 2625 895 2625 901 2625 907 2625 913 2625 919 2625 925 2625 931 2625 937 2...

Страница 320: ...z 201 88 1 202 88 3 203 88 5 204 88 7 205 88 9 206 89 1 207 89 3 208 89 5 209 89 7 210 89 9 2 1 1 90 1 2 1 2 90 3 213 90 5 214 90 7 215 90 9 216 91 1 217 91 3 218 91 5 219 91 7 220 91 9 221 92 1 222 92 3 223 92 5 224 92 7 225 92 9 226 93 1 227 93 3 228 93 5 229 93 7 230 93 9 231 94 1 232 94 3 233 94 5 234 94 7 9 19 ...

Страница 321: ...MHz 235 94 9 236 95 1 237 95 3 238 95 5 239 95 7 240 95 9 241 96 1 242 96 3 243 96 5 244 96 7 245 96 9 246 97 1 247 97 3 248 97 5 249 97 7 250 97 9 251 98 1 252 98 3 253 98 5 254 98 7 255 98 9 256 99 1 257 99 3 258 99 5 259 99 7 260 39 9 261 100 1 262 100 3 263 100 5 264 100 7 265 100 9 266 101 1 267 101 3 268 101 5 9 2 0 ...

Страница 322: ...z 269 101 7 270 101 9 271 102 1 272 102 3 273 102 5 274 102 7 275 102 9 276 103 1 277 103 3 278 103 5 279 103 7 280 103 9 281 104 1 282 104 3 283 104 5 284 104 7 285 104 9 286 105 1 287 105 3 288 105 5 289 105 7 290 105 9 291 106 1 292 106 3 293 106 5 294 106 7 295 106 9 296 107 1 297 107 3 298 107 5 299 107 7 300 107 9 9 21 ...

Страница 323: ...l Identification Plans Table 9 4 T Channels Channel Video T7 7 00 T8 13 00 T9 19 00 TlO 25 00 Tll 31 00 TI2 37 00 T 1 3 43 00 Standard Color 10 58 16 58 22 58 28 58 34 58 40 58 46 58 Sound 11 50 17 50 23 50 29 50 35 50 41 50 47 50 1 9 22 ...

Страница 324: ...ecially useful when creating test plans in system measurement mode Make photocopies of a blank channel survey map and enter the line numbers and channel numbers corresponding to your system Use the channel measurement mode of operation to gather this information by conducting the individual tests with PAUSE YES NO in the Setup menu set to YES then noting where the proper test signals are found 9 2...

Страница 325: ...Specifications and Test Aids Channel Survey Map ...

Страница 326: ...Specifications and Test Aids Channel Survey Map I Channel Line Number Number Odd ...

Страница 327: ...Specifications and Test Aids Channel Survey Map Even 1 I I I I ...

Страница 328: ...Specifications and Test Aids Channel Survey Map ...

Страница 329: ...I Specifications and Test Aids Channel Survey Map 9 2 8 ...

Страница 330: ...Specifications and Test Aids Channel Survey Map ...

Страница 331: ...Specifications and Test Aids Channel Survey Map ...

Страница 332: ...I Specifications and Test Aids Channel Survey Map ...

Страница 333: ...Specifications and Test Aids ...

Страница 334: ...Glossary ...

Страница 335: ...ept updated with incoming signal information air See off the air tune configuration amplitude accuracy The general uncertainty of an analyzer amplitude measurement whether relative or absolute ASCII The acronym for American Standard Code for Information Interchange It is an eight part code 7 bits plus parity check used for data information interchange An ASCII value is a specific combination of bi...

Страница 336: ...ctivity tells us how steep the filter skirts are Bandwidth selectivity is sometimes called shape factor battery backed RAM Random access memory RAM data retained by a battery RAM memory cards can contain data that is maintained with a battery Refer also to nonvolatile memory baud rate A rate of transmission that is measured as signal events per time period The baud rate is equal to or greater than...

Страница 337: ... some operation of an analyzer These codes can be keyed in via a controller or computer Refer also to function composite second order beat Composite second order beat CSO is the ratio of the composite second order beat products to the peak level of the visual carrier For a system using the standard tune conEguration the composite second order beat products are the distortion products that occur at...

Страница 338: ... as the luminance changes from a blanking level towards white level It is measured as the difference in amplitude between the largest and smallest segments divided by the largest and expressed in percent differential phase As deEned by the NTC this is the maximum peak to peak change in phase of the chrominance subcarrier as the luminance changes from a blanking level towards white level As deEned ...

Страница 339: ...ent at the input of an analyzer that can be measured with some degree of accuracy Dynamic range generally refers to measurement of distortion or inter modulation products end of line EOL readings Measurements taken at the last tap on the distribution cable error message A message displayed on the screen indicating missing or failed hardware improper user operation or other conditions that require ...

Страница 340: ...itude components is determined by resolution bandwidth Resolution of unequal amplitude signals is determined by resolution bandwidth and bandwidth selectivity frequency response The peak to peak variation in the displayed signal amplitude over a speciEed center frequency range Frequency response is typically speciEed in terms of dB relative to the value midway between the extremes It also may be s...

Страница 341: ...ommands The characteristics of these functions are determined by the Ermware in the instrument In some cases a DLP downloadable program execution of a function allows you to execute the function from front panel key selections gain compression The signal level at the input mixer of an analyzer where the displayed amplitude of the signal is a speciEc number of dB too low due just to mixer saturatio...

Страница 342: ...nt gain compression due to high level or broadband signals It is also used to set the dynamic range by controlling the degree of internally generated distortion For some analyzers changing the input attenuator settings changes the vertical position of the signal on the display which then changes the reference level accordingly In Hewlett Packard microprocessor controlled analyzers the IF gain is c...

Страница 343: ...restored in the limit line file Refer also to limit line log display The display mode in which vertical deflection is a logarithmic function of the input signal voltage Log display is also referred to as logarithmic mode The display calibration is set by selecting the value of the top graticule line reference level and scale factor in volts per division On Hewlett Packard analyzers the bottom grat...

Страница 344: ...ality per memory card Refer also to personality menu The analyzer functions that appear on the display and are selected by pressing front panel keys These selections may evoke a series of other related functions that establish groups called menus modem A device that enables a computer to interface with another computer or analyzer over the telephone connection Modem is an acronym for modulator and...

Страница 345: ...ision frequency reference parameter units Standard units of measure which include the following Measured Parameter frequency power level I power ratio voltage time electrical current impedance resistance Unit Unit Name Abbreviation hertz HZ decibel relative to milliwatts dBm decibel dB volt V second S ampere A ohm n personality Applications available on a memory card or other electronic media that...

Страница 346: ...o the analyzer s firmware The data can be accessed read only it cannot be altered by the user real number A positive or negative number with both a decimal and a fractional part reference level The calibrated vertical position on the display used as a reference for amplitude measurement in which the amplitude of one signal is compared with the amplitude of another regardless of the absolute amplit...

Страница 347: ...et Each sweep is initiated by pressing an appropriate front panel key or by sending a programming command softkey Key labels displayed on a screen or monitor that are activated by mechanical keys surrounding the display or located on a keyboard Softkey selections usually evoke menus that are written into the program software Front panel key selections determine which menu set of softkeys appears o...

Страница 348: ...ndwidth and video bandwidth Resolution affects sweep time in that the IF Elters are band limited circuits requiring Enite times to charge and discharge The amount of time the mixing product remains in the IF filter passband is directly proportional to the bandwidth inversely proportional to the sweep in Hz per unit of time The rise time of a Elter is inversely proportional to its bandwidth and if ...

Страница 349: ...onEgurations The HP 85721A can be configured for four different tune conEgurations STD AIR IRC and HRC units Dimensions on the measured quantities Units usually refer to amplitude quantities because they can be changed In analyzers with microprocessors available units are dBm dB relative to 1 mW dissipated in the nominal input impedance of the analyzer dBmV dB relative to 1 mV dBpV dB relative to ...

Страница 350: ...ed number of sweeps are completed the factors remain constant and the display becomes a running average video bandwidth The cut off frequency 3 dB point of an adjustable low pass lilter in the video circuit When the video bandwidth is equal to or less than the resolution bandwidth the video circuit cannot fully respond to the more rapid fluctuations of the output of the envelope detector The resul...

Страница 351: ...eceiver In this state the bandwidth is equal to the resolution bandwidth Signal amplitude variations are displayed as a function of time To avoid loss of signal information the resolution bandwidth must be as wide as the signal bandwidth To avoid any smoothing the video bandwidth must be set wider than the resolution bandwidth Glossary 18 ...

Страница 352: ...ed number of sweeps are completed the factors remain constant and the display becomes a running average video bandwidth The cut off frequency 3 dB point of an adjustable low pass filter in the video circuit When the video bandwidth is equal to or less than the resolution bandwidth the video circuit cannot fully respond to the more rapid fluctuations of the output of the envelope detector The resul...

Страница 353: ...Index ...

Страница 354: ... description 6 6 ALL TESTS key 3 23 3 25 ALREADY ENTERED error message 4 3 amplifier adjust real time 2 59 amplifier select external 7 l 1 amplitude ripple 5 14 amplitude slope 5 14 ANALOG ON OFF key 2 35 analyzer description of x Analyzer Input description 7 7 Analyzer Input key 2 5 3 6 analyzer operation xiv ATTEN STEP DN key 2 27 ATTEN STEP UP key 2 27 attenuation selection 2 9 audio volume 5 1...

Страница 355: ...CARRIER LVL FRQ key 2 12 CARRIER NOISE key 2 15 carrier to noise display calculation 2 19 preamplifier needed 2 19 carrier to noise ratio test 8 7 CATALOG ALL key 3 39 catalog analyzer memory 3 33 catalog a RAM card 3 36 CATALOG CARD description 6 7 Catalog Card key 3 39 CATALOG CARD key 3 36 cataloging the RAM or ROM card 6 7 Catalog Internal key 3 33 CATALOG REGISTER key 3 33 catalog the saved t...

Страница 356: ...clearing the test plan 6 9 CLEAR TESTS description 6 9 CLEAR TESTS key 3 23 3 25 clear the current test plan 3 32 CLEAR TST PLAN description 6 9 CLEAR TST PLAN key 3 22 3 32 clock setting the time and date 4 15 composite second order test 8 16 composite tripe beat test 8 18 CONFIG key l 11 3 37 connect cable TV signal 2 9 3 8 connecting analyzer to a printer l 10 connecting cable TV signal 2 10 co...

Страница 357: ...2 definitions characteristics 9 3 specifications 9 3 DELETE FILE key 3 39 delete files from a RAM card 3 38 delete HP 85721A personality l 15 delete individual files from RAM card 3 39 deleting a channel from the test plan 3 31 deleting a test for a channel 3 31 deleting the current test plan 3 32 deleting the test plan 6 9 delta marker 2 61 depth mod disturbances when measuring 2 31 DEPTH MOD key...

Страница 358: ...nel 6 18 entering a range of channels 6 18 entering the location 6 19 entering the start time 3 20 6 31 entering the stop time 3 20 6 31 entering the temperature 6 20 entering the time interval for timed testing 6 34 ENTER LOCATION description B 19 ENTER LOCATION key 3 10 6 19 ENTER STOP FRQ key 2 57 5 23 ENTER STRT FRQ key 2 57 5 23 ENTER TEMP description 6 20 ENTER TEMP key 3 11 enter the locati...

Страница 359: ... NO description 7 11 EXT PAD YES NO key 2 5 3 5 F FAST SWEEP key 2 57 5 24 fast time domain sweeps 2 31 FCC composite test signal 2 37 FCC COMPOSIT key 2 24 2 39 FCC measurement range carrier to noise 2 15 FCC multiburst test signal 2 51 Eeld entry system mode 3 23 3 25 FIELD ODD EVEN key 2 23 2 39 fields default 2 7 3 7 file length 6 8 file name 6 7 Ele name for test data 6 16 Ele number 3 21 fil...

Страница 360: ...7 grounding problems troubleshooting 2 48 guide conventions xiii H harmonically related carrier tune configuration selecting 7 12 hints carrier level and frequency test 2 14 carrier to noise measurements 2 20 CHANNEL SELECT 5 10 cross modulation measurement 2 30 CSOKTB measurement 2 28 depth of modulation measurement 2 35 FAST SWEEP for systems with channels not scrambled 5 26 frequency response 5...

Страница 361: ... initiating testing 3 14 initiating testing later 6 33 input configuration 2 10 7 7 input level maximum 2 9 3 8 input power measure 2 9 3 8 input voltage excessive 2 5 inserting the card 1 4 INTERNAL CARD key 3 33 3 39 selecting the memory card 1 6 internal preamplifier 2 5 INTGRTN RNG SET key 5 18 INVALID FILE NO ROOM error message 4 7 INVALID SYMTAB ENTRY SYMTAB OVERFLOW error message 4 6 IRC de...

Страница 362: ...iation 2 46 hum 2 48 in channel freq response 2 51 modulation and noise reduction 2 60 system CSOCTB system mode 3 14 system frequency response 2 57 system measurement mode 3 2 white noise of channel relative to peak sync pulse level 2 31 measurement steps system mode 3 3 measurement trace 5 14 Measure Now description 6 22 Measure Now key 3 14 memory card inserting 1 4 store results 2 12 2 19 2 25...

Страница 363: ... NEXT CHANNEL key 2 12 NEXT PAGE description 6 22 NEXT PAGE key 3 17 NO CARD FOUND error message 4 8 NO description 6 23 noise figure amplifier 7 10 noise level 2 15 non interfering carrier to noise 2 16 CSOCTB measurement 2 26 measurement setup l 12 select from Setup menu 2 6 select pause before measuring 2 7 notes frequency response without recalling reference 5 16 STOP TEST to exit frequency re...

Страница 364: ...nd 7 14 PICTURE ON OFF description 7 14 PIX SND ON OFF description 7 14 PIX ND ON OFF key 2 63 PLAN 1 description 6 23 PLAN 2 description 6 24 PLAN 3 description 6 25 PLAN 4 description 6 25 PLAN 5 description 6 25 PLEASE SELECT A CHANNEL error message 4 9 power line components 2 48 power measure input 2 9 3 8 preamplifier default gain 2 6 default noise figure 2 6 enter gain 2 6 enter noise figure...

Страница 365: ...l time clock setting the time and date 4 15 recall a test plan from analyzer memory 3 12 recall a test plan from RAM card 3 34 Recall Data description 6 27 Recall Data key 3 35 RECALL FRM CRD description 6 27 RECALL FRM CRD key 3 34 RECALL FRM INT 6 28 RECALL FRM INT description 5 20 6 28 RECALL FRM INT key 2 57 3 12 5 14 recalling what is recalled with the test plan 6 24 recalling a test plan fro...

Страница 366: ...in analyzer memory 6 29 SCRAMBLD YES NO key 2 12 scrambled channel system mode 3 23 scrambled status over a range 3 25 scrambling 8 45 screen send results to 6 17 screen text font guide conventions xiii select a channel individually 3 23 select all tests 6 6 select a range of channels 3 25 select channel 7 8 selected channels view 3 24 3 26 selecting all the tests 3 23 3 25 selecting the tune conf...

Страница 367: ...deviation Q 5 frequency response setup Q 8 frequency response test 9 8 hum 9 5 input configuration 9 3 non interfering gate on Q Q Option 704 freq reference 9 4 precision freq reference 9 4 visual carrier freq 9 3 visual carrier level 9 4 visual to aural carrier freq difference 9 4 visual to aural carrier level difference Q 4 SPECTRUM ANALYZER key 3 18 spectrum analyzer mode how to access 2 62 3 1...

Страница 368: ...45 SYSTEM FRQ RESP key 2 57 SYSTEM MEAS description 6 32 system menu map 6 3 system mode 3 2 TAKE REF TRACE description 5 23 TAKE REF TRACE key 2 57 5 14 T description 7 19 Television Broadcast Station Identification 9 10 Television station assigned frequencies 9 10 temperature entering 3 11 test and functions Digital Channel Power Measurement 2 42 test channel CTB testing 8 19 test descriptions 8...

Страница 369: ...view last 6 36 tests and functions abort measurement 6 6 analyzer input setup 7 7 carrier level 2 12 carrier to noise 2 15 channel select 5 9 channel tuning 7 8 chromakma delay 2 22 clear all tests 6 9 clear current test plan 6 9 co channel interference 5 27 composite second order 2 26 composite triple beat 2 26 create test plan 6 10 cross modulation 2 30 data to printer 6 10 default setup configu...

Страница 370: ...6 save data to RAM card 6 30 save test plan 6 29 6 30 save to plan number 6 23 6 24 6 25 save trace B to internal memory 5 21 select all tests 6 6 select channel 7 8 select external internal amp 7 l 1 select external pad 7 l 1 select next page of results 6 22 select page of results 6 21 select previous menu 6 26 select previous page 6 26 select time interval 6 34 set date today 6 35 set time and d...

Страница 371: ...ime interval 3 20 maximum time interval 6 34 TIME INTERVAL description 6 34 TIME INTERVAL key 3 20 time of creation 6 8 time varying scrambling 8 45 timing non standard test signal 2 23 title entry file 3 28 title entry using external keyboard 3 28 T key 2 4 3 4 TODAY S DATE description 6 35 TODAY S DATE key 3 20 TODAY S TIMEDATE description 6 35 TODAY S TIMEDATE key 3 20 total hum percentage 2 48...

Страница 372: ...CNTR FRQ description 7 21 USR CH 0 CNTR FRQ key 2 4 LJSR CH 0 SPAN description 7 21 USR CH 0 SPAN key 2 4 V valid channel numbers 3 23 VID AVG ON OFF key 2 33 video average depth mod 2 33 VIDEO SYNC NOT FUXOGNIZED error message 4 l 1 view channel selection 6 36 VIEW CH SEL description 6 36 VIEW CH SEL key 3 24 3 26 view co channel test 8 47 VIEW CO CHNL description 5 27 VIEW CO CHNL key 2 60 VIEW ...

Страница 373: ...mup time l 8 warning the warning symbol viii warranty vi waveform analyzer depth mod 2 33 white noise 2 31 WINDOWS 3 19 WINDOWS keys 2 63 wrong date or time is displayed 4 15 Y YES description 6 37 Index 2 1 ...

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