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Summary of Contents for 8756A

Page 1: ...o the Agilent website in an effort to help you support your product This manual provides the best information we could find It may be incomplete or contain dated information and the scan quality may not be ideal If we find a better copy in the future we will add it to the Agilent website Support for Your Product Agilent no longer sells or supports this product You will find any other available pro...

Page 2: ...r Network Analyzer having serial number prefix 2317A For additional information about serial numbers refer to INSTRUMENTS COVERED BY MANUAL in Section I Copyright HEWLETT PACKARD COMPANY 1983 1400 FOUNTAIN GROVE PARKWAY SANTA ROSA CA 95404 U S A MANUAL PART NO 08756 90013 Printed AUGUST 1983 Ff 1 HEWLETT a PACKARD ...

Page 3: ... stop for the operator who is not already hiahly skilled in the operation of the 8756A Following the OPERATING INFORMATION you will find Operatinq Note s and Programming Notes An OPerating Note illustrates a specific apPlication Basic Network Measurements Usina 8756A Scalar Network Analyzer and 8350B Sweep Oscillator of locallv operating the 8756A A Programminq Note on the other hand apPlies to re...

Page 4: ...ment OPERATION OPERATING INFORMATION Introduction Operating Characteristics Operating Instructions Operator s Checks Error Messages Front Panel Operating Features Soft Key Operating Features Rear Panel Operating Features HP IB Ooeratinq Features CRT Graphics HP 8756 Modified ASCII Character Set HP 8756A Status Byte DescriPtions Front Panel Kev Codes Operator s Check Soft Kev Menu Map OPERATING NOT...

Page 5: ...ll as the Hewlett Packard office Keep the shipping materials for carrier s inspection The HP office will arrange for repair or replacement without waiting for claim settlement 2 5 PREPARATION FOR USE 2 6 Power Requirements 2 7 The Mode I 8756A Seal a r Network Analyzer requires a power source of 100 120 220 or 240 Vac 5 to 10 50 to 60 Hz single phase Power consumption is approx imately 100 volt am...

Page 6: ...ns internal fac tory installed fuses which are not operator serviceable or replace able 2 10 POWER CABLE 2 11 In accordance with international safety standards this instrument is equipped with a three wire power cable When connected to an approptiate power line outlet this cable grounds the instrument cabinet Table 2 2 shows the styles of plugs available on power cables sup plied with HP instrumen...

Page 7: ...o xo 36 RO so 36 7l 79 79 Cable Color Mint Gray Mint Gray Gray Gray Mint Gray Mint Gray Black Black Black Jade Gray Jade Gray Jade Gray iray Gray Gray I I Ltrth Cirollnd I Line I 1 clltral For Use in Country United Kingdom Cyprus Nigeria Zimbabwe Singapore Australia New Zealand East and West Europe Saudi Arabia Egypt Republic of So Africa India unpolarized in many nations United States Canada Japa...

Page 8: ...ll of the externally mounted connectors of the 8756A are listed in Table 2 3 Opposite each 8756A connector is an industry identifica tion the part number of a mating connector and the part number of an alternate source for the mating connector For HP part numbers of the externally mounted connectors themselves refer to Section VI Replacable Parts 2 4 Model8756A Figure 2 2 HP IB Address Label 2 19 ...

Page 9: ...EOI LDI04 LOI03 True low State s0 8 Vdc Fal e high State 2 4 Vdc NOTE Mnemonics on the wiring list for A1 OJ1 and A1OJ2 are coded Band Ato differentiate between the two L BDI05 8756 System Interface L ADI05 HPInterface Bus Mnemonic LATN LDAV L DIOl through 8 LEOI LIFC LNDAC LNRFD LREN LSRQ MNEMONICS TABLE Description LOW Attention control line LOW Data Valid control line LOW Data Input Output line...

Page 10: ...ep In BNC 1250 0256 Specialty Connector Rear Panel 25 Pll8 l Al015 Stop Sweep BNC 1250 0256 Specialty Connector Rear Panel 25 Pll8 l 14 Modulator Drive 1 BNC 1250 0256 Specialty Connector Rear Panel 25 Pll8 l 15 Modulator Drive 2 BNC 1250 0256 Specialty Connector Rear Panel 25 Pll8 l 16 Modulator Drive 3 BNC 1250 0256 Specialty Connector Rear Panel 25 Pll8 l 17 Display Output X BNC 1250 0256 Speci...

Page 11: ...r the top and bottom cabinet surfaces The fan mounted on the rear of the 8756A pulls air into the instrument and out though the sides Insure that the air intake and exhaust venting holes are not obstructed within the limits given above 2 29 Front Handles Option 907 When installing front handles and rack mount kits insure that the correct screws specified in the installation figures in this section...

Page 12: ...ckard 2 8 Model8756A offices A complete diagram and listing of pac kaging materials used for the 8756A is shown in Figure 2 9 If the instrument is being returned to Hewlett Packard for servicing attach a tag indicating the type of service required return address model number and full serial number located on rear panel serial plate Mark the container FRAGILE to assure careful handling In any corre...

Page 13: ...Y 2 WITH FOUR 8 32 x3 8 SCREWS 3 PER SIDE 3 PRESS FRONT HANDLE TRIM 4 IN PLACE Qty 2 6 2 OPTION 907 HP Part No 5061 0090 CONTENTS HP Part No 5060 9900 2510 0195 5020 8897 c D 0 6 8 Description Front Handle Assembly 8 32 x 3 8 Screw Front Handle Trim Figure 2 5 Option 907 Front Handles Kit Installation 2 9 ...

Page 14: ...PS 1 2 ATIACH RACK MOUNT FLANGE 2 WITH 8 32 x3 8 SCREWS 3 3 REMOVE FEET AND TILT STANDS 4 BEFORE RACK MOUNTING OPTION 908 HP Part No 5061 0078 CONTENTS HP Part No 5020 8863 2510 0193 c D 8 7 Description Rack Mount Flange 8 32 x 3 8 Screw Figure 2 6 Option 908 Rack Mount Kit Model8756A ...

Page 15: ...3 WITH FOUR 8 32 x 5 8 SCREWS 4 PER SIDE 3 REMOVE FEET AND TILT STANDS 5 BEFORE RACK MOUNTING Qty 2 2 6 OPTION 909 HP Part No 5061 0084 CONTENTS HP Part No 5020 8875 5060 9900 2510 0194 c D 2 0 8 Description Rack Mount Flange Front Handle Assembly 8 32 x 5 8 Screw Figure 2 7 Option 909 Rack Mount Kit with Handles Installation 2 11 ...

Page 16: ...Installation 1 2 12 R INSTALLATI EMOVE RACK MOUNT F ON INSTRUCTIONS LANGE 3 AND OR FRONT HANDLE ASSEMBLY 1 nstru Preparation oifl mentforSh zpment Model8756A 2 ...

Page 17: ...iption 1 08756 800 11 6 Rear Spaces Corrugated 2 08756 80009 2 Carton Inner 3 08756 80010 5 Side Rail 4 9211 4499 7 Carton Outer 5 9222 0069 2 Poly Bag To Cover Instrument Not Shown Figure 2 9 Packagingfor Shipment Using Factory Packaging Materials 2 13 2 14 ...

Page 18: ...h if not correctly performed could result in SERVICING personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met The CAUTION sign denotes a hazard It calls attention to an operating procedure practice or the like which ifnot correctly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed ...

Page 19: ...6A SCALAR NETWORK ANALYZER POWER CABLE HP IB INTERFACE CABLE POWER CABLE PLUG SUPPLIED DEPENDS ON COUNTRY OF DESTINATION REFER TO SECTION II FOR PART NUMBER INFORMATION Figure 1 1 Model8756A Scalar Network Analyzer and Accessories Supplied ...

Page 20: ... properly adjust and align the instrument after repair f SECTION VI REPLACEABLE PARTS contains information required to order all parts and assemblies g SECTION VII MANUAL BACKDATING CHANGES contains backdating informa tion to make this manual compatible with earlier equipment configurations h SECTION VIII SERVICE provides an overall instrument block diagram with troubleshooting and repair procedur...

Page 21: ... supplement may contain information for cor recting errors in the manual To keep this manual as current and accurate as possible Hewlett Packard recommends that you period ically request the latest Manual Changes sup plement The supplement for this manual is identified with this manual s print date and part number both of which appear on the manual s title page Complimentary copies of the supple m...

Page 22: ... has the advantage of providing nearly General Information drift free operation An RF or microwave signal is square wave modulated at 27 8 kHz and pro vides the source for the 8756A Absolute power reflection or transmission signals are then detected and the modulation envelope is carried to an 8756A detector input After filtering and shaping the data is digitized and displayed 1 29 The modulation ...

Page 23: ...1NB provides an extended frequency range with the 85021A APC 7 test port connec 1 4 Model8756A tor and the 85021 C Precision Type N test port connector covering 0 01 to 18 GHz and the 85021 B APC 3 5 test port connector covering 0 01 to 26 5 GHz 85021A B C nominal impedance is 50 ohms 1 46 11665B Modulator 1 47 The 11665B Modulator is required if the RF signal source used does not have the capabil...

Page 24: ...40A Synthesized Sweep Oscillator modulate the RF output signal with the 8756A Modulator Drive output With the 8620C the Modulator Drive is connected to the Sweep Oscillator rear panel EXT AM input With the 8340A the Mod ulator Drive is connected to the Synthesized Sweep Oscillator front panel PULSE MOD ULATION INPUT The 8350A B Sweep General Information Oscillator is capable of internally modulati...

Page 25: ...ata from the 8756A using the HP lB Several output modes are available for output ting data Through a subset of HP GL Hewlett 1 6 Model8756A Packard Graphics Language user graphics may be plotted on the 8756A CRT The HP IB is Hewlett Packard s implementation of the IEEE Standard 488 1978 A complete general descrip tion of the HP IB is provided in the manual entitled Condensed Description to the Hew...

Page 26: ...frequency Frequency 27 8 kHz 100Hz 0 1 dB 0 01 dB dB from 10 to 40 dB Symmetry 50 2 0 2 dBm 0 02 dB dB from 40 to 50 dBm I T ERROR L REFERENCE TT POWER LEVEL 0 5 dB 10 dBm I I I I 10 0 101 20 301 40 50 POWER I Pill Dynamic Accuracy GENERAL REQUIREMENTS Sweep Voltage Horizontal sweep voltage pro Modulation Requirements Square wave amplitude vided by the Sweep Oscillator through the Sweep modulation...

Page 27: ...ard Speed ASCI I format trace 800 ms typical ASCII format point 10 ms typical Binary format trace 35 ms typical User accessible Graphics Number of vectors typi cally 750 two inch vectors with 60 Hz refresh rate Writing speed typically 10 p s per vector Transfer Formats Data may be transferred as either ASCII strings nominally 6 characters per reading or as 16 hit integers Readings may be taken at ...

Page 28: ...ator 10 dB Steps HP 355D P A T Type N f Connectors OptOOl Calibration Data at 50 MHz to O ot dB Opt H88 Resolution Oscilloscope Dual Channel HP 1740A P T Bandwidth 100 MHz Oscilloscope Probes 10 1 Divider 3 required 10 10041A T Universal Counter Frequency Range 30 kHz HP 5316A P T Frequency Resolution 1 Hz Time Internal Resolution 100 ms Digital Voltmeter Accuracy 0 03 HP 3456A A T Resolution 5 mV...

Page 29: ...n Off Ratio 2 30 dB at 50 MHz HP ll665B A T Modulation Rate 27 778 kHz Controller Personal Computer HP85F A T No Substitute Printer Plotter ROM Compatible with Controller HP P N 00085 15002 A T Advanced Programming Compatible with Controller HP PIN 00085 15005 A T ROM 16K Memory Module Compatible with Controller HP 82903A A T CAL56A Program Tape No Substitute HP PIN 08756 10001 A T Adapter N f to ...

Page 30: ...ERATING INFORMATION A complete Local and Remote reference on operat ing the Model 8756A 2 OPERATING NOTES Provide tutorial information on Locally operating the Model 8756A with other instruments 3 PROGRAMMING NOTES Provide tutorial information on Remotely operating the Model 8756A with other instruments and controllers 3 i ...

Page 31: ...8756A SCALAR NETWORK ANALYZER Copyright HEWLETT PACKARD COMPANY 1983 1400 FOUNTAIN GROVE PARKWAY SANTA ROSA CA 95404 U S A Printed APRIL 1983 rfin HEWLETT PACKARD ...

Page 32: ...the 8756 SYSTEM INTERFACE A measurement with the instrument requires the connection of detector s and or directional bridge s to the A B or R detector inputs on the front panel and the use of a compatible RF microwave source 3 5 The 8756A uses the AC detection technique in conjunction with its detectors This technique provides very stable measurements even with temperature variations and RF interf...

Page 33: ...e Fig 3 6 verify that the 8756A is functioning correctly It does not thoroughly check all specifications to their limits but is an appropriate test for daily instrument verification incoming inspection or verification after repair or replacement of digital circuits 3 11 ERROR MESSAGES 3 12 Error Messages are shown in the ACTIVE ENTRY AREA of the CRT display when conditions indicate a problem with ...

Page 34: ...ctions 3 ENTRY provides Data Entry for the SCALE REF and soft keys by means of the Knob the STEP keys or the Keypad 4 INSTRUMENT STATE provides information on the instrument and allows inputs to alter the state 5 DETECTOR INPUTS allow connection of 8756A compatible detectors and or bridges 6 SOFT KEYS provide additional functions for the 8756A 7 CRT DISPLAY CONTROLS 8 LINE controls AC power to the...

Page 35: ...played The Channel 1 LABEL is shown in area A Channel 2 in area B The Active Channel is shown with higher display intensity MEASurement CURSOR or MARKER value CHl A 28 50 dB 10 0 dB REF 0 0 dB I SCALE per division REFerence LEVEL value c D SOFT KEY LABELS The menu of available soft key selections are annotated A particular menu or function is chosen by pressing the soft key to the right of the sof...

Page 36: ...eeper HP IB is connected to the 8756 SYSTEM INTERFACE on the Rear Panel The 8350B or 8340A must have their HP IB address set to 19 decimal Reference Line Positions for channel 1 and 2 are denoted on the left margin of the graticule grid The Reference Line lies on major graticule lines only ACTIVE ENTRY AREA The last entry or HP IB command function selected is denoted here Exceptions are PRESET MEA...

Page 37: ...ess the soft key function LABELS ON OFF has selected labels OFF e A R e 8 R e A 8 e A 8 e R Selects MEASurement of detector signal RATIOs A R B R or A B When A R is selected the displayed data is the measured value of A in dBm decibel power ratio compared to one milliwatt minus the measured value of R in dBm Since the values are in dBm a logarithmic subtrac tion equals the linear division A R The ...

Page 38: ...e seen on the display Provides selection of either the REFerence LEVEL or REFerence POSN position of the LEVEL reference line REF POSN may be set to any PDSN of the major horizontal graticule lines using the KNOB or STEP keys The reference line LEVEL on the display is the dB or dBm value to which measurements are compared and serves as the horizontal line about which the display is expanded when t...

Page 39: ... the Keypad r 1 L J Clears the ACTIVE ENTRY AREA Terminates the AVG FACTOR under AVERAGE menu and ADDRESS in the INSTRUMENT STATE area Keypad entries Used to terminate keypad entries for SCALE REF LEVEL STEP REF and DET OFFSET under CAL menu functions Allows backspace to delete of the last digit s entered Figure 3 1 Front Panel Operating Features 6 of11 ...

Page 40: ...merical value of a function except CURSOR functions to the next allowed value The shift function of the STEP DOWN key provides for setting the REFERENCE LEVEL step size when using the STEP keys with REF LEVEL After selecting this function enter the value desired and terminate with the dBm dB key Allows easy entry of CURSOR SCALE REF LEVEL REF POSN AVG FACTOR or DET OFFSET under CAL menu functions ...

Page 41: ... up to 9 front panel settings which have been previously re tained in storage registers using the SAVE key The front panel setting desired is selected by depressing this key followed by a single digit 1 through 9 No terminat ing key is needed NOTE When the Model 8350B Sweep Oscillator or the Model 8340A Synthesized Sweeper HP IB address 19 decimal is connected to the 8756 SYSTEM INTERFACE SAVE and...

Page 42: ... channel m Modulation drive ON 2 When the 8350B Sweep Oscillator or 8340A Synthesized Sweeper HP IB address 19 is connected to the 8756 SYSTEM INTERFACE the following actions are performed on that source a Instrument Preset b Sweep time set to 200 ms c 8350B Square wave modulation ON RF Output ON OFF depending on plug in internal switch setting d 8340A PULSE Modulation Input ON RF Output ON 3 If a...

Page 43: ...command has been received over HP IB The shift function of this key causes the HP IB address for the 8756A to be displayed in the ACTIVE ENTRY AREA The address may be changed if desired using the keypad and terminated with the ENT key Allowable values are 1 through 29 decimal 0 30 and 31 decimal are not accessible This area displays the current HP IB status of the 8756A where R L T s Remote operat...

Page 44: ... functions of the 8756A beyond that of the Front Panel keys discussed above Related functions are grouped into a soft key menu A particular function on the menu dis played in the SOFT KEY LABEL area is selected by pressing the key to the immediate right of the label The MAIN MENU key displays and restores the MAIN MENU to the SOFT KEY LABEL area More details on the soft key menus and functions are...

Page 45: ...When the MAIN MENU or PRESET key is pressed the MAIN MENU of Soft Keys is always displayed A particular soft key menu or function is selected by then pressing the key to the immediate right of the label on the CRT display Selection of MAIN MENU does not alter any previously selected function parameter either from the Front Panel or Soft Key The following pages describe each Soft Key menu or functi...

Page 46: ...de of the measurement for a selected channel appears in the upper right corner of the MODE LABEL and also appears in the ACTIVE ENTRY AREA for the Active Channel This amplitude is always the selected MEASurement and DISPLAY reading resolved to 0 01 dB regardless of the SCALE per division or REFerence LEVEL value If either the 8350B Sweep Oscillator or the 8340A Synthesized Sweeper HP IB is connect...

Page 47: ...erence between the symbol position and the symbol position are annotated rn the FREQUENCY LABELS and also in the ACTIVE ENTRY AREA When Alternate Sweep is selected both CURSOR frequencies will appear for each sweep in the FREQUENCY LABELS CURSOR MAX 1 positions the CURSOR symbol to the maximum value point on the Channel 1 trace CURSOR MIN 1 positions the CURSOR symbol to the minimum value point on...

Page 48: ...except that Channel 2 is the Active Channel The PRESET value is 8 This factor may be changed at this time using the ENTRY area The Averaging Factors allowed are 1 no averaging 2 4 8 16 32 64 128 and 256 The averaging technique used is exponential averaging with data displayed using the following formula CURRENT DISPLAYED DATA AF 1 AF where AF Averaging Factor LAST DISPLAYED DATA 1 AF CURRENT MEASU...

Page 49: ...C SH RT g TO E HEN RE OY AVERAGE 1 ONI OFT I I STAT 2 I IBI IBGH r STOP 6 BBI IBGH z c c J T B a IU F 8l ld8 CON EC OP N 4 TO E HEN RE DY AVERAGE ON OFF REF I I I STAT 2 008BGH r STOP S IliBelliGH z d n nn V 0 IN C I EM 1 I t t _ 1 _ _ AVERAG 1 l l 1 1 I I 1 6 6 1 j __ 1 I l MORE STRT 2 8 H STOP 6 808BGH z e C J J T 8 a R f 00dB r i I 1 DET CT R 0 FS T i OPEN 00 00 dB r i 1 RCF I 1 I _ 1 1 I I 1 I...

Page 50: ...t prompt CONNECT OPEN STORE WHEN READY as shown in the ACTIVE ENTRY AREA of d At this point an open circuit a shielded open is recommended to the test port As with the short circuit averaging may be turned ON OFF with the AVERAGE ON OFF soft key to reduce noise on the trace When the open circuit trace data is displayed as desired STORE OPEN is depressed The ACTIVE ENTRY AREA now indicates the acti...

Page 51: ...VE ENTRY AREA This menu allows for plots to be made onto the HP IB Plotter either the 7470A or 9872C connected to the 8756 SYSTEM INTERFACE The Plotter address switches must be set to 00101 binary or 05 decimal for proper operation The Pl and P2 positions bottom left limit and upper right limit respectively will be the Plotter s default values but may be changed by the user at any time after power...

Page 52: ...8756 SYSTEM INTERFACE the CRT Display is frozen the plotter begins plotting and the ACTIVE ENTRY AREA appears as shown in b when any of the PLOT Menu soft keys are pressed When the plot is finished the CRT display appears as shown in c If the HP IB Plotter is improperly connected or not connected at all to the 8756 SYSTEM INTERFACE the CRT display appears as shown in d If the HP IB Plotter is not ...

Page 53: ...FF is selected on the MAIN MENU the MODE LABELS and Reference Line Position labels are alternately turned OFF as shown in a and ON When the 8350B Sweep Oscillator or the 8340A Synthesized Sweeper HP IB is connected to the 8756 SYSTEM INTERFACE the FREQUENCY LABELS will be alternately turned OFF and ON also Figure 3 2 Soft Key Operating Features 9 of10 3 22 ...

Page 54: ...ears as shown in a MOD ON OFF turns the 27 8 kHz square wave output from the MODULATOR DRIVES located on the rear panel of the 8756A ON and OFF When OFF the MODULATOR DRIVES provide the power necessary to hold an external modulator in the minimum insertion loss mode SERVICE provides for enabling the built in serviceability routines see Section VIII Service Figure 3 2 Soft Key Operating Features 10...

Page 55: ... The 8756 SYSTEM INTERFACE control of the 8350B or the 8340A provides frequency annotation shown in the FREQUENCY LABELS of the CRT display SAVE RECALL and PRESET pressed on either instrument of both instruments and Alternate Sweep capability The 8756 SYSTEM INTERFACE control of the 7470A or the 9872C provides for hard copy plots using the PLOT Menu of the Soft Keys and PRESET to default values fo...

Page 56: ...driving external HP 11665B modulators or the external Amplitude Modulation of a sweep oscillator When using the 8340A Synthesized Sweeper this modulator drive should be connected to the PULSE MODULATION INPUT 7 DISPLAY OUTPUTS Output connectors providing X Y and z outputs for driving another peripheral such as a large screen display for example Model 1310B The added peripheral should have a bandwi...

Page 57: ...rom a designated channel measurement trace or memory trace in one of two formats specified by the user as well as other TALK functions Also the HP 8756A can pass through HP IB commands to either the HP 8350B Sweep Oscillator or the HP 8340A Synthesized Sweeper and the HP 7470A or 9872C plotter connected to the 8756 SYSTEM INTERFACE All of these codes are described in these tables Table 3 l Table 3...

Page 58: ...blanking the entire CRT display or restoring the display to its normal power on condition The Clear Status command clears sets to zero both Status Bytes The Format Data commands are useful for outputting data as shown in Table 3 2 The Format Data ASCII FDO command will output data in the format of ASCII signed digits as shown in the table The Format Data Binary FDl command will output data in the ...

Page 59: ... Write Memory is used to write to a particular channel memory with 401 points of data After receiving the WM command the 8756A expects 401 values in the format FDl or FDO previously selected These values in turn are written to the Channel Memory previously designated Cl or C2 HP IB OUTPUT COMMANDS Data is output from the 8756A by first sending one of the 0 commands listed in Table 3 2 Output Curso...

Page 60: ...l should be avoided Further see 8756 SYSTEM INTERFACE below This address will become the address and remain unchanged even if power is turned off or IP is received 8756 SYSTEM INTERFACE The 8756 Rear Panel has another control port called the 8756 SYSTEM INTERFACE This connector is physically the same as that defined for the Hewlett Packard Interface Bus but is specifically used to control an HP IB...

Page 61: ...ce 17 will send commands to the HP IB Sweep Oscillator An example of pass through commands to the HP IB Plotter with address 05 decimal using the default HP 8756A address is 1 Address device 16 the HP IB of the HP 8756A send the characters PT05 or PT05 cr lf 2 Address device 17 the 8756 SYSTEM INTERFACE send HP GL commands to the Plotter 3 Address device 16 This returns the HP 8756A to its normal ...

Page 62: ... the 8756A is placed in Local Lockout the HP IB Sweep Oscillator is also placed in Local Lockout The HP 8756A will return to local mode when it receives the GTL Go To Local message or when the REN line goes high FALSE It will also return to local when the LOCAL key is pressed unless the LLO message was previously received On power on the HP 8756A is in local mode When the 8756A is first placed in ...

Page 63: ...y immediately reading the two byte values respectively The Status Bytes of the HP 8756A are described in Table 3 6 The SRQ is cleared only by executing a Serial Poll Device Clear DCL Selective Device Clear SDC PRESET or sending the CS or OS commands The Request Mask function RM can be used to select a particular set of condition s for initiating a Service Request SRQ The mask value is determined b...

Page 64: ...ds use the Standard ASCII Code character set The address of the CRT Graphics is the HP 8756A address minus 1 since the default address of the HP 8756A is 16 decimal the default address of the CRT is 15 decimal An example of addressing the CRT Graphics using the default addresses is 1 Address device 16 the HP IB of the HP 8756A send the characters PT15 or PT15 cr lf 2 Address device 17 the 8756 SYS...

Page 65: ...e location of the graticule are shown below 8756 R CRT in GDU s 2698 2047 2 347 1920 237 128 0 0 The scaling points for bottom left and for top right are set at Pl 0 0 and P2 2698 2047 respectively ERASE PAGE COMMAND EP The Erase Page Command EPn erases graphics memory page n Syntax EP n term or EP term where n 1 to 5 EP with no parameters erases all five pages Figure 3 5 CRT Graphics 2 of6 3 34 ...

Page 66: ...bsolute Command PA allows for movement of the beam to the point specified in plotter units by the X and Y coordinate parameters that complete the command Syntax PA x1 coordinate Y1 coordinate X coordinate Y2 coordinate Xn coordinate Yn coord1nate term A PA command requires that both the X and Y coordinates a coordinate pair be specified The X coordinate parameter specifies the absolute X location ...

Page 67: ...solute Command PA allows for movement of the beam to the point specified in plotter units by the X and Y coordinate parameters that complete the command Syntax PA x1 coordinate Y1 coordinate Xz coordinate Y2 coordinate Xn coordinate Yn coord 1nate term A PA command requires that both the X and Y coordinates a coordinate pair be specified The X coordinate parameter specifies the absolute X location...

Page 68: ...ETX The Label mode can be terminated only by sending the ASCII character ETX the byte value 0000 0011 or decimal 3 at the end of the character string Before using the Label Command the beam should be moved to the location where labeling is to begin by using the PU command followed by the PA command This point will be the lower left corner of the first character After lettering a character the beam...

Page 69: ... characters in centimeters Syntax SI width height term width height values allowed are 0 14 0 17 Smallest size MODE LABELS SOFT KEY LABELS 0 21 0 25 ACTIVE ENTRY AREA 0 28 0 34 0 35 0 42 Largest size or SI term An SI command with no parameters selects the smallest size GRAPH ENHANCEMENT SELECT PEN COMMAND SP The Select Pen Command SP allows selection of beam intensity Syntax SP n term n values all...

Page 70: ...ING OUTPUT Pl AND P2 COMMAND OP with An The Output Pl and P2 Command OP outputs the current coordinates of the scaling points Pl and P2 in GDU s Syntax OP term The format of the output is the following Plx Ply P2x P2y cr lf where Plx lower left Pl x value Ply lower left Pl y value P2x upper right P2 x value P2y upper right P2 y value all in GDU s ADDITIONAL GRAPHICS CONTROL DEFAULT COMMAND DF The ...

Page 71: ...detector R detector Ratio Measurement A detector R detector Ratio Measurement A detector Absolute Power Measurement B detector Absolute Power Measurement R detector Absolute Power Measurement Store Measured Data in Memory Display Measured Data Display Memory Data Display Measured Memory Data Autoscale Data on CRT Set Scale per Division d set to 20 10 5 2 1 5 2 or 1 Moves the Cursor or Active Marke...

Page 72: ...8756A and the 8756 System Interface Restore Main Menu soft key labels and functions COMMAND DESCRIPTION Turns Cursor On Off Moves Cursor to maximum for active channel Moves Cursor to minimum for active channel Turns Cursor 6 On Off Turns averaging off Sets the averaging factor d is set to 2 4 8 16 32 64 128 or 256 Plot entire display except user graphics on external plotter Plot only characters la...

Page 73: ...o bytes are output in the following scale Two Byte value decimal 32767 0 MEAS RATIO or M MEM 90 dB 90 dB MEAS PWR 20 dBm 70 dBm Designates the pass through address for the 8756 System Interface Mask selected bits of the Status Byte d is a decimal integer from 0 to 255 Places Cursor at horizontal position d Range 0 to 400 decimal Stop tracking sweep ramp freeze data on display Continuously track sw...

Page 74: ...utput Output Output 3 42 value usually for CW measurements Non swept mode swo and format FDm must be previously set Identity or Output the 8756A identity The character string is 8756A cr lf Keycode OK Output keycode for last key DD lf pressed Refer to Table 7 Status OS Output Status Bytes the BB EOI status byte is sent first followed by the extended status byte Then both bytes will be cleared NOTE...

Page 75: ... Data OI Output Identity OK Output Keycode of last key pressed OM Output Memory OS Output Status Bytes OV Output Current Measurement Value Pl Plot trace 1 on external plotter P2 Plot trace 2 on external plotter PA Plot all on external plotter except user CRT graphics PC Plot labels on external plotter PG Plot grid on external plotter PTd Pass Through to address d RCn Recall Register n RLd Referenc...

Page 76: ... 2 short dashes 3 long dashes OP Output Pl and P2 positions PA xl yl Plot Absolute X and y are integers and x2 y2 are in Graphics Display Units GDU s I xN yN PD Pen Down PU Pen Up SI w h Absolute Character Size w width h height Values allowed are 0 14 0 17 Smallest size 0 21 0 25 0 28 0 34 0 35 0 42 Largest size SP n Select pen n 0 to 4 0 Pen up 1 Brightest Intensity 2 3 4 Lowest Intensity The fol...

Page 77: ... is ignored Table 3 5 HP 8756A Modified ASCII Character Set 8756A MODIFIED ASCII CODE CONVERSION TABLE MOST SIGNIFICANT CHARACTER 0 2 3 4 5 6 7 0 centered SP 0 p p 1 HP logo centered o 1 A 0 a q 2 f3 I 2 B R b 3 3 c s c s 4 upper half tic 4 0 T d t LEAST 5 lower half tic 5 E u e u SIGNIFICANT 6 lett half tic v 6 F v I v CHARACTER 7 right half tic rr 7 G w g w 8 back space l 8 H X h X 9 1 2 shift d...

Page 78: ... STATUS BYTE 1 5 4 3 2 1 32 16 8 4 2 SRQ on HP IB SRQ on SRQ on Soft SRQ on SRQ on Syntax Error Operation Key Only Change in Numeric Entry Complete Pressed Extended Completed Sweep or Status Byte HP IB or Plot Front PaneQ EXTENDED STATUS BYTE 2 5 4 3 2 1 32 16 8 4 2 SRQ on Low Battery Voltage Table 3 7 Front Panel Keycodes Values are in decimal ENTRY STEP DOWN 22 STEP UP 6 0 KEY 20 1 KEY 4 2 KEY 3...

Page 79: ...pable of outputting at any frequency within the frequency range of the 11664A Detector 10 MHz to 18 GHz or the 116648 Detector 10 MHz to 26 5 GHz and also capable of outputting a 0 to 10 volt sweep ramp and positive z blanking The Sweep Oscillator also must be able to accept an external 27 8 kHz AM modulation input If an external AM input is not available an external modulator such as the HP 11665...

Page 80: ...ess PRESET to start the built in Self Test routine If the Self Test passes the graticule MODE LABELS and MAIN MENU will appear on the display If the Self Test fails an error message will be displayed in the ACTIVE ENTRY AREA 3 On the 8756A press the Soft Keys MORE SERVICE A6 HPIB Press the Soft Key HPIB LSTN to begin the first HP IB test If this test passes the message HPIB LSTN PASS will appear i...

Page 81: ...ut to the A Detector Input of the 8756A On the 8756A press PRESET Press Channel 1 SHIFT MEAS RATIO CHAN OFF to turn Channel 2 off 6 Connect Detector input to the RF output of the Sweep Oscillator for a thru 0 dB insertion loss connection On the 8756A press Channel 1 SHIFT SCALE AUTOSCALE to put the trace on the display then press MAIN MENU the Soft Key CURSOR to turn CURSOR on and finally Soft Key...

Page 82: ...1 dB however the noise floor should always be 50 00 dBm or lower 8 Insert the Microwave Test Device between the RF output of the Sweep Oscillator and the Detector On the 8756A press Channel 1 DISPLAY M MEM and then SHIFT SCALE AUTO SCALE Wait about 20 seconds to allow averaging to settle Press CURSOR MAX 1 to find the trace maximum The CURSOR value in the ACTIVE ENTRY AREA now displays the inserti...

Page 83: ...Channel 1 SHIFT MEAS RATIO CHAN OFF to turn Channel 2 off and select Channel 1 MEAS PWR to R Repeat Steps 6 through 8 for the R Detector Input 11 If any test fails or Microwave Test Device measurements do not reasonably match previous measurements refer to the Performance Tests in Section IV 12 When finished with the Operator s Checks reconnect the 8756A with the cabling configuration necessary fo...

Page 84: ...ges i 1dicated in the tables below SERIAL PREFIX OR NUMBER MAKE MANUAL CHANGES SERI AL PREFIX OR NUMBER MAKE MANUALCHANGE S 2404A 1 NEW ITEM NOTE Manual change supp ements are revised dS often as necessary to keep manuals as current and accurate as possible Hewlett Packard recommends that you periodically request the latest edition of this supplement Free copies a e ava l lb e from all HP offices ...

Page 85: ...t HAS handles in an equipme nt rack Horizontal s pacing is 482 6 mm 19 in Refer to Section II for details Page 1 9 Table 1 3 Add P Performance Test A Adjustment T Troubleshooting Page 1 10 Table 1 3 Add P Performance Test A Adjustment T Troubleshooting Page 2 9 Figure 2 5 Delete Option 907 front handles are standard on the HP 8756A Page 2 1 L Figure 2 7 Delete Item 3 Change Option 909 to option 91...

Page 86: ...his SWEEP IN 0 IOV input is requireci stopping the sweep such as placing the sweep oscillator in CW mode will place the 8756A in a waiting for sweep state CW mode is usable as long as the sweep ramp is provided On the 83508 Sweep Oscillator the sweep ramp is provided when SHIFTI CW is pressed On the 8340A Synthesized Sweeper the CF F mode must be useci with F set to 100 Hz Page 3 27 Figure 3 4 Del...

Page 87: ...3 to Lowest Intensity CHANGE 1 This change implements Revision 2 0 Firmware OPERATING INFORMATION Page 3 4 Figure 3 1 To D add The active channel is shown with a higher display intensity Page 3 23 Figure 3 2 Above SERVICE add the soft key FREQ LBL ON OF F 1 Add FREQ LBL ON OFF turns ON and OFF the CRT display of frequency information Page 3 40 Table 3 1 Add FREQ LBL OFF BLI Turns CRT frequency inf...

Page 88: ...f frequency information To the bottom left menu above the soft key SERVICE add the soft key FREQ LBL ON OFF PROGRAMMING NOTES Quick Reference Guide Page 6 Table I Add FREQ LBL OFF BLL Turns CRT frequency information OFF BLO turns frequency information back on Page 9 Table 3 Add BLL Frequency labels OFF BLO turns frequency information back on Introductory Operating Guide 8756 Series 200 Programming...

Page 89: ...ter 3 from the HP 8756A OUTPUT 717 ALI4 This alternates register 4 from the source OUTPUT 716 This exits Pass Through Using Pass Through Mode Ensure that instruments are not set to the HP 8756A Pass Through address General Programming Information When using a TIMEOUT interrupt set the time parameter to a minimum of 5 seconds without a plotter and 9 seconds with an HP 9872C or 7475A The instruments...

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