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Model Three - Operation Manual

Basic Operation

Chapter 5

Once you have set up the Model Three’s parameters, you are ready to
operate the device.

There are a number of tests you can perform with the Model Three:

•

Single channel level tests

•

Frequency mode

•

Channel scans

•

Limit tests

•

Frequency scanning (spectrum)

•

Hum measurement

•

QAM measurement

•

Tilt and favorite channel levels

Fast Setup

The Model Three features a Fast Setup function for each measurement
mode. The specific setup menu for each mode can be accessed directly
by pressing the

SET

7 STU

key once while in the Measurement mode. This

makes it unnecessary to go back to the main

SETUP

menu and look for

nested sub-menus. This allows the operator to quickly make changes in
the settings and return to Measurement mode with no wasted time.

The Model Three displays readings down to -
50 dBmV (+10 dB

μμμμμ

V). All signal levels that are

below -40 dBmV (+20 dB

μμμμμ

V) are displayed

with lighter shade digits in all measurement
modes to indicate they are low signal levels.

Pressing the

SET

7 STU

key twice always displays

the main SETUP menu.

Содержание Three

Страница 1: ...Model Three Signal Level Meter 99 Washington Street Melrose MA 02176 Phone 781 665 1400 Toll Free 1 800 517 8431 Visit us at www TestEquipmentDepot com ...

Страница 2: ......

Страница 3: ... in engineering and custom assembly Trilithic is dedicated to providing quality products services and communications solutions that exceed customer expectations Trilithic is comprised of five major divisions Broadband Instruments and Systems Offers test analysis and quality management solutions for the major cable television systems worldwide RF Microwave Components Provides components and custom ...

Страница 4: ... Favorite Group Display 10 Single Channel Display 10 Single Channel Spectrum 10 Scan Display 10 Spectrum Display 11 Hum Display 11 QAM Measurement 11 Data Logging 11 Limit Test 11 Auto Test Programs 12 Voltmeter 12 File Saving and Viewing 12 Equipment Supplied with Your Model Three 12 Accessories and Replacement Parts for Your Model Three 13 3 Walkthrough 15 Identify Components 15 Key Pad 16 Navig...

Страница 5: ...27 Date and Time 27 LCD Test 28 Upgrade 29 Prior Menu 29 Measurement 30 Transmission 30 Level Units 30 Single Frequency Setup 31 Limit Setup 31 Reset Max Hold 33 Voltage 34 Hum Frequency 35 Prior Menu 35 Channel Plan 36 Select User Plan 36 Channel Numbers 36 Learn User Plan 37 Edit User Plan 40 Tilt Level List 43 Load Defaults 44 Prior Menu 44 ...

Страница 6: ... 62 QAM Measurement 63 QAM Channel Measurement 63 QAM Frequency Mode 64 Spectrum Analyzer Display 65 QAM Constellation Display Optional 66 Tilt and Favorite Channel 67 6 Advanced Operation 69 Transmission Characteristic Test 69 Auto Test 74 QAM Parameters 77 Level Parameters 78 Spectrum Parameters 79 Limit Parameters 80 Tilt Parameters 81 Hum Parameters 81 File Saving and Viewing 87 Saving a Test ...

Страница 7: ...nterest to you http www fieldtechproducts com Trilithic s website contains product specifications and information tips release information marketing information FrequentlyAsked Questions FAQs bulletins and other technical information You can also check this website for product updates 1 General Informaiton Chapter 1 ...

Страница 8: ...on introduces the equipment and features of the Model Three Chapter 3 Walkthrough describes the components of the Model Three Chapter 4 Setup describes the steps needed to perform the setup of the Model Three Chapter 5 Basic Operation describes how to use the basic features of Model Three Chapter 6 Advanced Operation describes how to use the advanced features of Model Three Chapter 7 Specification...

Страница 9: ...user entered text and commands appear in bold Section names Web and e mail addresses appear in italics A NOTE is information that will be of assistance to you related to the current step or procedure A CAUTION alerts you to any condition that could cause a mechanical failure or potential loss of data A WARNING alerts you to any condition that could cause personal injury ...

Страница 10: ...he meter The battery MUST be charged with the AC to DC power adapter and battery charger provided with the Model Three Using any other adapter charger may damage the battery The accuracy of the meter may be affected when in a strong electromagnetic field Do not use the Model Three in any manner not recommended by the manufacturer ...

Страница 11: ...unattended The Model Three can save files for QAM Level Tilt Spectrum Scan Limit test Hum and Auto test measurements These files can be recalled to display the recorded data or Scan Spectrum and Limit files can be viewed graphically The Model Three also makes it easy to obtain a hard copy of installation data or documentation of a problem via the optional Model Three ToolBox software The device is...

Страница 12: ... or digital power Single Channel Spectrum The Model Three can also provide a spectral display of the selected channel including intermodulation products or other undesired signals that may be present For a digital channel this measurement shows the actual shape of the modulation haystack to determine if there are any problems with the digital transmission system This feature provides you with a po...

Страница 13: ...gging You can select and save the test data of the QAM Level Tilt Limit Hum Scan and Frequency spectrum tests The Model Three has the capability to store the amplitudes of all video and audio carriers up to 170 channels These data records can be captured in nonvolatile memory and later recalled or uploaded to your PC for record keeping Each record carries the time date and other Model Three inform...

Страница 14: ...ccommodate AC or DC voltages up to 100 Volts File Saving and Viewing The Model Three can save records from QAM Level Tilt Favorite channels group Spectrum Hum Scan or Limit test measurements either to individual files or all to one file These files can be recalled to display the recorded data and Scan Spectrum and Limit graphics can be viewed All files may be uploaded to a PC with the Model Three ...

Страница 15: ...ription 2130854000 Holster 2130856000 Protective sleeve 0930149000 Model Three ToolBox includes USB data cable 2072084000 USB data cable 2131064000 Replacement protective carrying case 0320050000 Replacement strap for carrying case 2131253000 Replacement blue rubber protective bumper 0090055000 Replacement battery 2072036000 Replacement charger 0200579000 Replacement F type connector ...

Страница 16: ...14 Model Three Operation Manual THIS PAGE LEFT INTENTIONALLY BLANK ...

Страница 17: ...ce s charge socket and PC interface socket are on the bottom The RF F connector is on the top of the device The belt clip is located on the back of the device Key pad PC interface Charge socket Connectors located under rubber cover on bottom of device LCD display with backlight RF F connector The thin protective film layer used to protect the display during shipping should be removed Your Model Th...

Страница 18: ...HUM 9 YZ FCN FCN 0 QAM QAM __ Soft buttons 11 primary and secondary function buttons ON OFF button Charge indicator Arrow buttons Soft Buttons The F1 F1 F2 and F3 keys are used to access various functions within the display menus On specific displays three boxes appear at the bottom of the display These boxes correspond to the three soft keys and provide additional commands such as ENTER EXIT SCAL...

Страница 19: ...PQR SET SET 7 STU FILE FILE 8 VWX HUM HUM 9 YZ FCN FCN 0 QAM QAM Key Function Purpose AUTO 1 Enter Auto test mode TILT 2 Enter Tilt measurement mode LIMIT 3 Enter Limit test mode LEVEL 4 Enter single channel frequency measurement mode SCAN 5 Enter Channel Scanning mode SPECT 6 Enter Frequency Spectrum scanning mode SET 7 Use for Fast Setup or Main Setup menu FILE 8 Save or recall measurement files...

Страница 20: ... Model Three Entering Alphanumeric Characters Similarly you must enter alphanumeric data on several screens such as file names Channel labels and Auto test program names As before you press the FCN FCN 0 key to put the key pad into its secondary function mode then press the buttons to enter the desired value When you press a button in function mode the first entry is the number associated with the...

Страница 21: ...ress TILT TILT 2 DEF TILT TILT 2 DEF TILT TILT 2 DEF to enter E in the field 4 Press SET SET 7 STU SET SET 7 STU to enter S in the field 5 Press to shift to a new entry with the same key 6 Press SET SET 7 STU SET SET 7 STU SET SET 7 STU to enter T in the field If you make an error when entering a number or a name you can press the F2 key to go back and then re enter it Press the F3 key to escape f...

Страница 22: ...e Flashes when the charge drops below 10 User Plan Indicates the selected user channel plan Display Indicator Indicates which function is being used Main Display Screen Displays the parameters and graphs of the selected function F1 F2 F3 Indicates the function of the soft buttons in the selected Model Three mode Main display screen Time Battery User plan Display indicator F1 F2 F3 The soft buttons...

Страница 23: ...of the Model Three see Chapter 3 Walkthrough Identify Components and plug the charger into an AC outlet While charging the charge indicator on the front panel of the Model Three will be RED A full charge will be achieved in less than three hours and will be indicated as such by a GREEN charge indicator The charging status may be observed by turning the Model Three ON and then OFF while the charger...

Страница 24: ...22 Model Three Operation Manual THIS PAGE LEFT INTENTIONALLY BLANK ...

Страница 25: ...ntrast shutdown time temperature units and date and time Measurement signal level units single frequency setup limit setup transmission voltage Channel plan select learn and edit the user plan channel number display tilt favorite list The Model Three battery may need charging prior to first use see Chapter 3 Walkthrough Battery Charging Model Three ToolBox Software may also be used to set up the M...

Страница 26: ... STU key twice always displays the main Setup menu see Chapter 5 Basic Operation Fast Setup Information The Information display windows contain useful information regarding your Model Three The first screen of information shows the device s serial number firmware version hardware version and the company s web address You can use the F2 and F3 keys to scroll through other information screens to see...

Страница 27: ... selection determines the backlighting time on the Model Three display Press the F1 F1 key or use the __ and keys to change the backlighting time The selected time is displayed in the window near the bottom of the display screen You can select ON backlighting is always on OFF backlighting is always off or 3 5 10 or 30 minutes activates the backlight for the selected number of minutes then turns it...

Страница 28: ...se the __ and keys to change the shutdown time The selected time is displayed in the window near the bottom of the display screen You can select ON always on until manually turned off or 3 5 10 or 30 minutes the Model Three shuts itself off when there has been no Model Three activity for the selected time interval A caution screen appears 20 seconds prior to automatic shutdown as shown below This ...

Страница 29: ...ts the date and time Press the F1 F1 key to enter the DATE TIME screen Do the following to enter the date and time 1 Press the FCN FCN 0 key to perform alphanumeric entries The current date disappears from the field Enter the date in the date order displayed to the left of the field 2 When you are satisfied with your entry press the F1 F1 key again to log the date in the Model Three s memory then ...

Страница 30: ...press the F3 key to restore the date or time in the field LCD Test This selection tests the LCD display When you press the F1 F1 key repeatedly the Model Three display advances through four patterns to test the LCD then returns to the menu The patterns are all black all white vertical stripes and checkerboard Each pattern remains on the screen until you press the F1 F1 key to go to the next patter...

Страница 31: ...to go to the main SETUP menu 2 Use the F2 and F3 keys to select GENERAL and press the F1 F1 key 3 Use the F2 and F3 keys to select UPGRADE and press the F1 F1 key 4 Press the FCN FCN 0 key FUNCTION for alpha numeric entry and enter the 12 digit authorization code and press the F1 F1 key The Model Three will confirm correct entry of the code Your Model Three now includes the Constellation diagram f...

Страница 32: ...ed transmission state ON or OFF is displayed in the window near the bottom of the display screen Use this parameter to test for transmission characteristics and loss of in between connections in your CATV system see Chapter 6 Advanced Operation Transmission Characteristic Test Level Units Use this selection to set the signal level units for the Model Three The selected signal level units are displ...

Страница 33: ...croll to the selection FREQ STEP Select the meter s internal step values by pressing the F1 F1 key or press the __ and keys The tuning steps can be either 10 MHz 1 MHz 100 kHz 10 kHz or by Channel PRIOR MENU Press the F1 F1 key to return to the previous menu Limit Setup Press the F1 F1 key to enter the SCAN SETUP menu Use this menu to set Scan parameters including test limits To select an item fro...

Страница 34: ...1 F1 key or press the __ and keys to select or deselect viewable Limits in Scan mode When DISPLAY LIMITS is activated the test limit settings for Minimum Video and Maximum Video can be seen on the display during channel scanning see Chapter 5 Basic Operation Channel Spectrum Scanning EDIT LIMITS Press the F1 F1 key to enter the EDIT LIMITS menu All parameters used in a Limit test may be set in thi...

Страница 35: ...IMIT DEFAULTS and press the F1 F1 key to return all limits to their standard settings Once you have set the levels for each parameter scroll to SAVE AND EXIT and press the F1 F1 key to return to the previous screen MARKER Use this selection to switch between channel and frequency indicators for markers in the Scan mode Use the F1 F1 ENTER key or press the __ and keys to change the marker PRIOR MEN...

Страница 36: ...o bar graphs The top bar graph indicates the battery charge of your Model Three This approximate charge level and the battery voltage are also displayed numerically As you use the device you can access this screen to check the remaining battery power When the battery charge drops below 10 the battery symbol flashes in the information line at the top of the display screen If the charge drops below ...

Страница 37: ...rement Press the F1 F1 key or press the __ and keys to switch between 50 Hz and 60 Hz The selected frequency is shown in the window near the bottom of the display screen When 50 Hz is selected 50 and 100 Hz Band Pass Filters are enabled in Hum measurement When 60 Hz is selected 60 and 120 Hz Band Pass Filters are enabled in Hum measurement Prior Menu Press the F1 F1 key to return to the main Setup...

Страница 38: ...elect User Plan Use this selection to set the active user plan You can have up to four user defined channel plans A D on the Model Three Use the F1 F1 ENTER key or press the __ and keys to select between STANDARD or EIA channel numbering Use the F1 F1 ENTER key or press the __ and keys to change the selected user plan Channel Numbers Use this selection to choose the channel identifier in the Model...

Страница 39: ...ur cable system Press the F1 F1 key to learn a channel plan A prompt appears to instruct you to connect the CATV cable to the Model Three Whenever you learn a new Channel Plan the previously edited parameters are overwritten by the new plan and all files and Auto test programs that were saved for the previous plan are deleted ...

Страница 40: ...settings Use the F1 F1 ENTER key or press the __ and keys to change the channel plan settings If Digital Channels are enabled for learning the user plan all active digital channels will be set to the parameters selected on the list If a Channel Plan is learned with less than 15 active channels found or the cable is not connected to the Model Three all channels in the plan are enabled Test Equipmen...

Страница 41: ...lan has all active channels enabled Analog channels with levels less than 10 dBmV 50 dBμV and Digital Channels with levels less than 17 dBmV 43 dBμV are not enabled After learning a Channel Plan the Model Three returns to the Level measurement mode You may then modify the various parameters in the plan To return to the Channel Plan Setup menu to edit your User Plan press the SET SET 7 STU key twic...

Страница 42: ...nel you wish to modify is highlighted press the F1 F1 ENTER key The selected Channel Setup screen appears To select the channel s parameters use the F2 and F3 keys to scroll up and down the list There are different methods for modifying each parameter Edit User Plan Once you have learned a Channel Plan you can edit the plan Whenever you edit a Channel Plan all files and Auto test programs that wer...

Страница 43: ... User Channel Plan Disabling a channel removes it from the User Plan Type Use the F1 F1 key to toggle between the channel types TV SIGL or DIGI When using FCN to make an alphanumeric entry remember to press the F1 F1 ENTER key after you have made an entry to store the new data see Entering Alphanumeric Characters in Chapter 3 Walkthrough Identify Components Navigating Functions TV Audio and Video ...

Страница 44: ... ENTER key to store the change this parameter appears for DIGI type only When you are satisfied with your entries highlight SAVE AND EXIT and press the F1 F1 ENTER key to return to the Edit User Plan screen Adding a Channel A channel may be added while in the Edit User Plan list of channels by pressing the __ key A Channel Edit screen appears for the new channel with the next available channel num...

Страница 45: ...SETUP menu Tilt Level List This feature lets you select up to 12 favorite channels These channels are also used when making the Tilt measurement Press the F1 F1 ENTER key from the Tilt Level List selection on the CHANNEL PLAN SETUP menu to enter the Tilt Setup screen To add a channel to the Favorites list use the F2 and F3 keys to scroll the list of channels in the selected User Plan All edits are...

Страница 46: ...screen This will not change the User Channel plan Prior Menu Press the F1 F1 ENTER key to return to the main SETUP menu When the desired channel is highlighted press the F1 F1 key A check mark appears next to the channel under the Tilt column and the channel number is placed in the Favorites column at the bottom of the display As you add channels the Favorites list arranges them in order of their ...

Страница 47: ...ment mode The specific setup menu for each mode can be accessed directly by pressing the SET SET 7 STU key once while in the Measurement mode This makes it unnecessary to go back to the main SETUP menu and look for nested sub menus This allows the operator to quickly make changes in the settings and return to Measurement mode with no wasted time The Model Three displays readings down to 50 dBmV 10...

Страница 48: ...turned off TV Channels When measuring a TV type channel with audio and video carriers see Chapter 4 Setup Channel Plan Edit User Plan the left column of the bar graph represents the video carrier while the right column displays the audio carrier The V A Δ is displayed below the video and audio carriers To change the channel use the __ and keys or press the FCN FCN 0 key enter the desired channel n...

Страница 49: ...e __ and keys to increase or decrease the reference by one digit at a time Press the F3 UP key to return to the original Level screen so that the functions of the F1 F1 and F2 keys become FREQ and MAX The amplitude of the graph changes as you change the scale and reference so that it continues to indicate the correct level You must press the F3 UP key to return to the original Level screen for the...

Страница 50: ... mode a Δ Δ Δ Δ Δ is displayed after the digital reading The analog bar graphs forAudio and Video continue to indicate the LIVE level in all modes while the wavy line at the top of each bar indicates the maximum level of the Audio and Video signals Single Channel Spectrum The Model Three can scan the spectrum of the designated channel automatically This function is particularly useful for CATV mea...

Страница 51: ...ey to return to the normal single marker spectrum display Use the F1 F1 AUTO key to automatically set a scale and reference for the displayed spectrum graph You may set the Scale and Reference manually by pressing the F3 DOWN key and using the F1 F1 and F2 keys for Scale and Reference as described for the preceding Level display mode The spectrum display can also use an Average detector instead of...

Страница 52: ...icate Single Frequency mode Also displayed are Δ Δ Δ Δ Δ FREQ and Δ Δ Δ Δ Δ AMP to indicate the distance and amplitude difference between the center frequency and the highest peak of the signal in the bandwidth To scan the channel spectrum press the LEVEL LEVEL 4 JKL key again While in Level mode you can use Fast Setup to go directly to the setup parameters for the current channel With a Single Fr...

Страница 53: ... DIGI mode Channel parameters are also displayed including Center Frequency Bandwidth Modulation Type and Symbol Rate To scan the channel spectrum press the LEVEL LEVEL 4 JKL key again The Marker level indicated for a DIGI signal in the channel spectrum mode is only the level at the marker frequency and not the total power for the channel bandwidth You can return to the single channel level mode p...

Страница 54: ... the channel is a TV type channel with audio and video carriers the Model Three is tuned to the audio frequency If the channel is a DIGI type channel the Model Three is tuned to the center frequency The signal level and peak level are displayed To change the frequency that is being measured press the __ and keys The frequency moves in increments set in the SINGLE FREQUENCY SETUP menu By pressing F...

Страница 55: ... designed to display the full span of all channels including video and audio carriers or digital channels in your system This function provides a quick check of your system s overall flatness and amplitude The Model Three can also be set to display the channels at reduced frequency spans Amplitude limits can be imposed on the display while a convenient Marker enables you to zoom in on any suspect ...

Страница 56: ...ress the SET SET 7 STU key once for Fast Setup select Marker and press the F1 F1 key to change the marker indication You can zoom in on the marker position by pressing the SCAN SCAN 5 MNO key The Model Three supports five levels of magnification 1x 2x 3x 4x and 5x or scan of the full channel plan The minimum span 5x shows 25 channels of data To return to the original zoom level keep pressing the S...

Страница 57: ... and keys to increase or decrease the reference Press the F3 UP key to return to the original soft key functions of Auto and Hold Display Limits When Display Limits is set to Yes in the Scan Setup menu see Chapter 4 Setup Measurement Limit Setup the Channel Scan display shows the limit lines for the specified Minimum Video level and Maximum Video level While in the Channel Scan mode you can use Fa...

Страница 58: ...m the Limit Setup menu see Chapter 4 Setup Measurement Limit Setup To perform the Limit test press the LIMIT LIMIT 3 GHI key Channels are displayed momentarily as each channel is scanned In addition a progress bar indicates the scan status When the Limit test is complete a Test Result summary screen appears to indicate the Pass or Fail status for each test parameter Each test that has passed has a...

Страница 59: ...el test the adjacent channels with the greatest variation are listed The Minimum Video Maximum Video Minimum Δ V A and Maximum Δ V A are tested for all channels in the User Plan If any channel fails one of these tests the Test Result summary indicates a failure X for that test If all channels pass one of these tests the Test Result summary indicates a pass check mark for that test A digital DIGI t...

Страница 60: ...ndividual channel tests displays an X You can use the F2 and F3 keys to scroll through the list of channels one at a time or use the __ and keys to scroll one page eight channels at a time Press the F1 F1 key to look at the Limit test information for a specific channel The Video level Audio level and Δ V A for the selected channel are shown at the top of the individual channel information screen T...

Страница 61: ...ion Characteristic Test The following information is for normal absolute spectrum scanning Transmission mode is set up in the MEASUREMENT menu Since the following data is for normal absolute spectrum scanning Transmission should be set to OFF in the MEASUREMENT menu see Chapter 4 Setup Measurement Transmission The Model Three can show spectrum data with absolute measurements or it can store data f...

Страница 62: ... marker frequency and level With Full Spectrum scan all video carrier frequencies or center frequency of digital channels in the selected Base Channel Plan including those disabled for Channel Scan are scanned To move the marker frequency press the __ and keys To change the spectrum bandwidth press the F2 SPAN key The span cycles through 2 50M 6 25M 12 50M 25 00M 62 50M and PLAN_A D full span When...

Страница 63: ... select RESET MAX HOLD in the MEASUREMENTS SETUP menu You may wish to stop the scanning process so you can study the graph In the Spectrum screen simply press the F1 F1 HOLD key The scan marker stops moving To resume scanning press the F1 F1 TRIG key Other functions are available by using the F3 key to change the function of the F1 F1 and F2 keys Press the F3 key to change the function of the F1 F...

Страница 64: ...e marker Spectrum display Press the F3 key to change the function of the F1 F1 key to AVG This permits the Spectrum function to use an Average mode instead of a Peak detector This is most useful for digital channels to see a quick scan of average power for frequencies within the selected span Hum Measurement The Hum measurement function is used to troubleshoot interference that may result from a d...

Страница 65: ...UM HUM 9 YZ key again to view the 60 Hz and 120 Hz Band Pass Filter measurements The Band Pass Filter frequencies can be changed from 60 Hz and 120 Hz to 50 Hz and 100 Hz in the MEASUREMENTS SETUP menu The measured channel may be changed using the __ and keys QAM Measurement The Model Three is able to measure MER and pre and post BER It takes an average of one second to perform the QAM measurement...

Страница 66: ... the F1 F1 key to switch the display between pre BER and post BER measurements In this mode press the SET SET 7 STU key to view the settings for the current channel You can setup center frequency bandwidth modulation mode symbol rate and other digital channel settings QAM Frequency Mode The Model Three provides a frequency mode to easily view and setup the key measurement parameters for QAM testin...

Страница 67: ...o channel test mode RENEW F2 Refresh the measurement DOWN F3 Turn to Menu number 2 2 MODE F1 Choose Modulation mode 16 256 QAM RATE F2 Choose Symbol Rate 1 000 7 000 Ms sec UP DOWN F3 Turn to Menu number 3 3 PRE POST F1 Switch between Pre BER and Post BER STEP F2 Set the Frequency step UP DOWN F3 Turn to Menu number 4 4 STD F1 Choose Modulation Standard J 83A J83 B J83 C NONE F2 None UP F3 Back to...

Страница 68: ...the F2 and F3 keys to choose a quadrant to view and press the F1 F1 key to refresh the constellation Each quadrant can be observed individually by pressing the __ key to zoom in To zoom out press the key See Chapter 5 Basic Operation Single Channel Level Testing for complete instructions QAM Constellation Display Optional Pressing the QAM QAM key a third time will display the Constellation display...

Страница 69: ... accessed directly by pressing the F1 F1 SETUP key See the Tilt Level List Setup section of the CHANNEL PLAN SETUP menu see Chapter 4 Setup Channel Plan Tilt Level List When four to 12 channels have been selected for Tilt Favorite channels the Tilt screen can be displayed with a graph of the Video levels for each channel The measured levels of the LOWEST and HIGHEST frequencies listed in the Tilt ...

Страница 70: ...bled channels display a check mark When finished press the TILT TILT 2 DEF key to save the changes and return to the tilt display To bring up the list of favorite channels press the TILT TILT 2 DEF key again The Model Three displays the list of favorite channels with their Video Carrier Levels or digital power levels and the tilt calculation Press F1 F1 SETUP to set the tilt channels ...

Страница 71: ...int such as the headend s output test point or a node s output test point This reference can then be compared to the transmission response at other places in the distribution system to allow proper gain and tilt adjustments of the distribution system To test the transmission characteristics you first need to enable the Transmission option From Spectrum mode the MEASUREMENTS SETUP menu including Tr...

Страница 72: ...ou to connect the device to the cable system After you have connected the CATV source to the Model Three press the F1 F1 ENTER key The Model Three scans all video carrier frequencies in the selected Base Channel Plan including those disabled for channel scan see Chapter 4 Setup Channel Plan When the Model Three has completed the new Zero Reference scan a prompt appears to press the F1 F1 key to st...

Страница 73: ...equency The Model Three displays the transmission measurement The reference level indicates Δ dB to show the difference between the current Scan Level and the Zero Reference scan In the example above a 6 dB loss is seen with the transmission measurement Channels in the Base Channel Plan that are not active on your system have a transmission indication near 0 dB because there was no signal to be ch...

Страница 74: ...ing the F3 key to change the function of the F1 F1 and F2 keys Press the F3 key to change the function of the F1 F1 and F2 keys to SCALE and REF Change the display scale by pressing the F1 F1 SCALE key Change the reference level by pressing soft key the F2 REF key and using the __ and keys to change the reference Press the F3 key to change the function of the F1 F1 and F2 keys to Auto and Δ Δ Δ Δ ...

Страница 75: ... Δ Level are displayed Press the F2 MARK key to return to the normal single marker Transmission display Press the F3 key to change the function of the F1 F1 key to AVG to enable an average level reading instead of a Peak Detector reading in the spectrum scan The new Zero Reference scan remains in the Model Three so you can measure the relative change at a later time To perform another Transmission...

Страница 76: ...d testing programs to automatically perform Level Spectrum Tilt Favorite Hum QAM and Limit tests in specified time increments The Model Three can store up to seven user programs for recall when needed The test results are stored to a file automatically after measurement and they can be viewed or uploaded to a PC later To run or set up an Auto test press the AUTO AUTO 1 ABC key The Auto test progra...

Страница 77: ...r the alphanumeric entry window to appear Enter up to five alphanumeric characters for the program name and press the F1 F1 ENTER key see Entering Alphanumeric Characters in Chapter 3 Walkthrough Identify Components Navigating Functions The new program name appears on the screen for STEP 1 Press the F2 NEXT key to continue ...

Страница 78: ... to highlight any test then press the F1 F1 ENTER key to enable or disable the test When only the desired tests are enabled with a check mark press the F2 NEXT key to continue The Auto test screen for STEP 3 appears You can change the parameters for each of the selected tests by using the __ and keys to highlight the test then press the F1 F1 ENTER key The Auto test parameter displays are describe...

Страница 79: ...bled parameters for testing are indicated by a check mark Next select the QAM channels to test Highlight the CH SELECT item and press the F1 F1 ENTER key to display all of the digital channels that are listed in the current user plan Press the F2 ALL key to select all of the channels in the user plan for testing Press the F2 CLEAR key to deselect all of the channels in the user plan ...

Страница 80: ...measurement parameters have been enabled press the F3 BACK key to return to the Auto test screen for STEP 3 Level Parameters Use the __ and keys to highlight any channel in the selected user plan then press the F1 F1 ENTER key to enable or disable the channel for the Level test An enabled channel displays a check mark next to it To perform QAM measurements you must first have digital channels incl...

Страница 81: ...el Plan Use the __ and keys to highlight the center frequency selection for the Spectrum test Press the FCN FCN 0 key enter the center frequency numerically in MHz and press the F1 F1 ENTER key This parameter is not used if the full span bandwidth is selected When the desired frequency and bandwidth have been set press the F3 BACK key to return to the Auto test screen for STEP 3 There are no defau...

Страница 82: ...disable any Limit parameter you can press the F1 F1 ENTER key to display the Edit Limits screen All Limit parameters may be changed as described in Model Three Setup for the Edit Limits display see Chapter 4 Setup Measurement Limit Setup When the desired changes have been made in the Edit Limits screen select SAVE AND EXIT to return to the Auto Test Limit Parameter screen If the settings displayed...

Страница 83: ...e channel for the Tilt test An enabled channel displays a check mark next to it and will be listed in the Tilt Channel boxes at the bottom of the display At least four of the 12 maximum number of Tilt channels must be selected for Tilt to operate When the desired TILT channels have been selected press the F3 BACK key to return to the Auto test screen for STEP 3 Hum Parameters Use the __ and keys t...

Страница 84: ...equence only once each time it is started you can press the F1 F1 START key to immediately begin execution of the testing program If the F1 F1 key is selected to start the program the Model Three performs the selected tests and then shuts off A file containing all test records is created and automatically saved The file name is the Auto test program name followed by an asterisk to indicate that it...

Страница 85: ...routine The Auto test screen for STEP 5 appears A default time interval of eight hours between test times is displayed To change the time interval press the FCN FCN 0 key enter a new number from one to 23 hours and press the F1 F1 key to enter A new Auto test program that is started as a single test sequence no 24 HR test has default settings for 24 HR operation eight hours four tests stored with ...

Страница 86: ...ss the F1 F1 START key to begin execution of the testing program The Model Three immediately performs the first sequence of tests After each test time sequence is complete an Auto test program status screen appears for a short time then the Model Three shuts off Since the first Auto test time is always performed immediately upon starting the program the four default test times provides a 24 Hour s...

Страница 87: ...t test is part of a 24 HR Auto test program a 24 Hour Video Deviation report Rep_24 is also createdandsavedafterthelasttestsequence This data record lists the maximum video deviation over all time tests for each channel along with a Pass P or Fail F indication for the channel based on the Limit test parameter setup at the time the Auto test was performed If you wish to save the Auto test program f...

Страница 88: ... highlight the program name and pressing the F3 INFO key Parameters for each test may be viewed by using the __ and keys to highlight the test and pressing the F1 F1 ENTER key to view the setup parameters Also the status of the 24 HR setup can be seen by pressing the F2 key to view the test times and time intervals ...

Страница 89: ...files may also be uploaded to a PC Saving a Test Record to a File Before saving a record be sure the time date and date sequence M D Y has been set see Chapter 4 Setup General Date and Time If the date sequence is changed after storing files the date information for those files will not be correct To save a test record press the FILE FILE 8 VWX key The Model Three File directory appears with the f...

Страница 90: ...e records that will be saved to the file Any or all of the listed records may be saved to one file When only the desired test records are enabled ON press the F1 F1 OK key to continue The alphanumeric entry window appears to enter the desired file name Enter up to five alphanumeric characters for the file name and press the F1 F1 ENTER key see EnteringAlphanumeric Characters in Chapter 3 Walkthrou...

Страница 91: ...ppears with the file name User Plan and a list of all test records in the file Use the __ and keys to scroll to the test record that you wish to list the data record or view graphically Limit Spectrum and Scan records only To LIST the data for a test record press the F1 F1 LIST key Limit Test This data record is listed with the number of channels failed for individual Channel test parameters displ...

Страница 92: ... levels for each channel in the Scan test Use the F2 and F3 keys to scroll to any channel Level Test This data record lists all Video and Audio levels for each channel in the Level test Use the F2 and F3 keys to scroll to any channel On any listed record you can use the __ and keys to scroll through the channel list data points for Spectrum test by one page eight channels at a time The Pass or Fai...

Страница 93: ...e file record display You can also press the F3 key to change the soft key functions of the F1 F1 and F2 keys to set the Scale and Reference manually Spectrum Test A view of the Spectrum scan is displayed The display may be controlled like a Live Spectrum Scan The __ and keys move the marker The F1 F1 TRIG key changes the display to a Live Spectrum scan instead of the file record display The F2 SP...

Страница 94: ...n instead of the file record display You can also press the F3 key to change the soft key functions of the F1 F1 and F2 keys to set the Scale and Reference manually The view of file records F2 operates with Limit Spectrum and Scan records only The View function does not operate with Level Tilt Hum and QAM records While viewing a data record you can press the FILE FILE 8 VWX key to return to the Fi...

Страница 95: ...y an asterisk to indicate that it is a single Auto test file This is shown in the image below for an Auto test program named TEST 1 The suffix for this file was added automatically A file for 24 HR Auto test records is created for each Auto test time The file name is the Auto test program name followed by an alphabetical assignment beginning with A for each test time file to indicate they are 24 H...

Страница 96: ...at the time the Auto test was performed Auto test files may contain QAM Level Tilt Spectrum Hum or Limit test records These files may be listed or viewed Use the __ and keys to scroll to the file name of the file you wish to view and then press the F3 LOAD key The File Content screen appears with the file name user plan and measurement items which have been executed You can select the desired meas...

Страница 97: ...e Operation Manual Level measurement data Tilt measurement results QAM measurement results Spectrum measurement data Hum measurement data Limit measurement results Spectrum measurement graph Limit measurement graph ...

Страница 98: ...96 Model Three Operation Manual THIS PAGE LEFT INTENTIONALLY BLANK ...

Страница 99: ... MHz to 1 GHz 35 dBmV to 60 dBmV Accuracy 25 dBmV 1 5 dB 10 to 30 C 50 to 86 F 3 0 dB 10 to 40 C 14 to 104 F Resolution 0 1 dB Input impedance 75 Ω unbalanced BNC or F type connector Hum Range 2 to 5 LPF BPF Accuracy 0 5 BPF Channel Scan Number of channels 170 max Scanning speed 3 channels per second Scale 1 2 5 10 dB div Zoom 1x 2x 3x 4x 5x five levels of magnification or full channel plan scan F...

Страница 100: ...ional Display Size 64 and 256 QAM Constellation with zoom capability Tilt Measurement Number of channels 4 to 12 Resolution 0 1 dB Limit Test Parameters Any of the following may be enabled Min video 40 to 119 dBμV 20 to 59 dBmV Max video 41 to 120 dBμV 19 to 60 dBmV Max Δ video 2 to 30 dB Min Δ V A 0 to 15 dB Max Δ V A 5 to 30 dB Max Δ ADJ 0 to 20 dB 24 hour video dev 0 to 20 dB Auto Test Number o...

Страница 101: ...15 VDC 2 A max Charge time Less than three hours Display 128 x 128 backlit LCD Communication Port RS 232C Converts to USB with data cable Storage 32 Kb of memory Up to 30 complete scan files 170 channels max or 22 complete limit test files 170 channels max less if other files level tilt QAM Hum spectrum are saved Weight 1 76 lbs 800 g Dimensions 8 52 x 3 74 x 1 93 H x W x D 218mm x 95mm x 49mm dim...

Страница 102: ...yer under this Warranty and in no event shall Trilithic Inc be liable for incidental or consequential damages for any alleged breach of this Warranty This Warranty shall not apply to any part of the product which without fault of Trilithic Inc has been subject to alteration failure caused by a part not supplied by Trilithic Inc accident fire or other casualty negligence or misuse or to any cause w...

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Страница 104: ...9710 Park Davis Drive Indianapolis IN 46235 317 895 3600 P N 0010295001 05 09 Made in U S A Visit us at www TestEquipmentDepot com ...

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