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HP 8672A User's Manual

1. CX 9t Stands For Code J Dummy Argument For Most Significant Frequency Digits Execute Code Frequency Digits WHERE C PROGRAM CODE X ARGUMENT OR FREQUENCY DIGIT PROGRAM CODES ARGUMENTS PROGRAM CODES ARGUMENTS 10 GHz or P 0 dBm 9 1 GHz AorQ T 7 10 1 2 100MHz 2 10MH Cors c 40 4 2 1MH DorT 9 THROUGH 9 K or 50 5 100kHz EorU a 60 6 10 kHz For V 70 7 1 kHz Gor W 80 8 EXECUTE Jor Z 90 9 5 OFF 6o0r7 30 kHz 5 100 kHz 4 3 dB 9 N or 300 kHz 3 oc 2 1 2 18 3MHz 1 oc E 4 10 MHz 9 gt 2 5 ui 6 RFOFF 0246 8 gt L or a 7 NORMAL 1i l 5 8 10 RANGE 3 6 9 XTAL NORMAL 5 10 RANGE 7 S MTR NORMAL 10 RANGE STATUS BYTE ae ee MK RSV CRYSTAL OUT OF 10 dBm LEV OVEN REQUEST RANGE OVER COLD SERVICE frequency RANGE 3 21 Operation 3 22 HPL STATEMENTS rem 7 wrt 719 P12345678Z1 stp or end or whatever wrt 719 K1L7 wrt 719 M3 wrt 719 01 clr 719 Model 8672 BASIC STATEMENTS START n EMOTE Message Send REN command to insure bus is in ien FORMAT B OUTPUT i282 75231 remote enable state Program frequency of 12345 678 mHz 4d CMD UPQ234S56T7821 Pr
2. 1 56 SELECTING THE HP IB ADDRESS 1 57 The HP IB address switches are located with in the Synthesizer The switches represent a two digit octal number This number corresponds to talk and listen address characters which an HP IB controller is capable of generating A table in Sec tion II shows all HP IB talk and listen addresses Refer to the paragraph entitled HP IB Address and Parallel Poll Response Selection in Section II 1 58 ACCESSORIES SUPPLIED 1 59 The accessories supplied with the Synthesizer are shown in Figure 1 1 a The line power cable may be supplied in several combinations of plugs Refer to Power Cables in Section II b Fuses with a 3 0A rating for 100 120 Vac HP 2110 0003 and a 1 5A rating for 220 240 Vac HP 2110 0043 are supplied One fuse is fac tory installed according to the voltage available in the country of destination Refer to Line Voltage Selection in Section II There are four extender boards supplied which aid in performance testing troubleshooting the instrument 1 30 15 x 2 extender board HP part number 08672 60117 2 Two 36 pin 18 x 2 extender boards HP part number 08672 60020 3 One S section 30 pins 15 x 2 per section extender board HP part num ber 08672 60016 for use in the A2 Assembly 4 60 EQUIPMENT REQUIRED BUT NOT SUPPLIED 1 61 For Option 002 instruments which lack an internal frequency standard an extern
3. in its normal operating position Turn the mecha nical zeroing adjustment clockwise to move the needle up scale or counter clockwise to move the needle down scale The zero point is located at the left end of the 0 1 or the 0 3 scales DO NOT zero on the left end of the top dB scale at 10 as this is not the proper zeroing point 3 10 LOCAL OPERATION Before the instrument is switched on all protective earth terminals extension A cords auto transformers and devices connected to it should be connected to a protective earth grounded socket Any interruption of the protective earth grounding will cause a potential shock hazard that could result in personal injury Only fuses with the required rated cur rent and specified type should be used Do not use repaired fuses or short cir cuited fuseholders To do so could cause a shock or fire hazard Before the instrument is switched on it must be set to the voltage of the power source or damage to the instrument may result 3 11 A procedure for verifying the major func tions of the Synthesizer is provided in Tables 3 3 and 8 4 The procedure is divided into two parts Local Operator s Checks and Local Operating Instructions The Local Operator s Checks should be performed first to verify proper operation of the Synthesizer The Local Operating Instructions explain how to set and use the Synthesizer s con trols 3 12 LOCAL OPERATOR S CHECK 3 13 Table
4. 2 18 Interface Connector The HP IB mating con nector is shown in Figure 2 4 2 19 Coaxial Connectors Coaxial mating connec tors used with the Synthesizer should be 50 ohm Type N male connectors that are compatible with those specified in US MIL C 39012 2 20 Operating Environment 2 21 The operating environment should be within the following limitations 0 C to 55 C Humidity 3350 Sorc he euss x E ws lt 95 relative lt 4570 metres 15 000 feet NOTE _ RF Output accuracy flatness and maxi mum power will meet specifications only between 15 and 38 C 2 22 Bench Operation 2 23 The instrument cabinet has plastic feet and fold away tilt stands for convenience in bench operation The plastic feet are shaped to ensure self aligning of the instruments when stacked The tilt stands raise the front of the instrument for easier viewing of the control panel PARALLEL POLL RESPONSE s PARALLEL POLL SENSE Figure 2 3 Location of HP IB Address and Parallel Poll Switches 2 3 Installation Model 8672A SIGNAL GROUND PIO TWISTED PAIR WITH 11 PIG TWISTED PAIR WITH 10 SHIELD S CONNECT TO ATN GROUND SHOULD BE GROUNDED P O TWISTED PAIR WITH 9 ION P O TWISTED PAIR WITH 8 NDAC TWISTED PAIR TWISTED PAIR WITH 7 NRFD P O TWISTED PAIR WITH 6 DAV REN EO 0108 0104 0107 0103 0106 0102 0105 0101 TYPE 57 MICRORIB
5. means that the digit will change only if programmed OW means that above 6 2 GHz this digit may changedue to random rounding however it will always be within 2 kHz of programmed value means that for a given program code the leading zero is supplied by the instrument s hardware Figure 3 5 Frequency Programming Receiving Data Messages Cont d 8 34 Programming Output Level The 0 to 110 dBm positions of the Synthesizer s RANGE switch and the Functions of the VERNIER control are Argument For Range programmed with the output level string The VERNIER control s function is programmed in KXLX 1 dB steps from 3 to 10 dB RANGE is pro d oscar Uem grammed in 10 dB steps and the 10 dB position Code For Range over range of the RANGE switch is programmed with the ALC code and argument see paragraph 3 36 Although it is possible to program the 10 dB range with 10 dB step attenuation RANGE it is unnecessary and should not be done The output level program string consists of CREE MES the program codes for RANGE and VERNIER t For the Synthesizer to achieve a 10 dBm output level the each followed by an argument Table 3 7 as shown RANGE and VERNIER arguments must be set for 0 dBm 3 16 Model 8672A Tahle 3 7 Output Level 0 Receiving Data Messages Cont d 20 30 40 50 60 3 35 Programming Modulation The Synthesizer accepts codes and arguments Table 3 8
6. Controllers The Output Re gister Test Board is intended to aid in trouble shooting the frequency control circuits 1 68 Refer to the 11712A Support Kit operating manual for additional information It may be ordered through your nearest Hewlett Packard office 1 69 RECOMMENDED TEST EQUIPMENT 1 70 Table 1 2 lists the test equipment and acces sories recommended for use in testing adjusting and servicing the Synthesizer If any of the recom mended equipment i is unavailable instruments with equivalent minimum specifications may be used 1 Frequency Accuracy needed 1 ppm minimum requirement 10 ppm 1 7 Model 8672A Installation SECTION INSTALLATION 2 1 INTRODUCTION 2 2 This section provides the information needed to install the Synthesizer Included is information pertinent to initial inspection power requirements line voltage selection power cables interconnec tion environment instrument mounting storage and shipment 2 3 INITIAL INSPECTION WARNING To avoid hazardous electrical shock do not perform electrical tests when there are signs of shipping damage to any por tion of the outer enclosure covers panels meters 2 4 Inspect the shipping container for damage If the shipping container or cushioning material is damaged it should be kept until the contents of the shipment have been checked for completeness and the instrument has been checked mechanically and electri
7. LINE switch to ON and check for the following conditions 1 RANGE dBm display 110 dBm RF annunciator OFF ALC annunciator INT and LEV UNCAL Q AMannunciator OFF FM annunciator OFF FREQUENCY MHz display some frequency between 2 18 6 GHz if frequency display is not stable press PRESET 3 GHz key Frequency Resolution Light Bars extinguished STATUS annunciators OVEN may be lit and will extinguish when the reference oscillator oven operating temperature is reached NOT PHASE LOCKED M illuminated and will generally extinguish when the reference oscillator has warmed up before the OVEN light extinguishes 2 Press PRESET 3 GHz key and FREQUENCY display should now indicate 3000 000 MHz 3 5 Operation Model 8672A Table 3 3 Local Operator s Checks 2 of 4 OPERATION Cont d 8 one at a time the four FREQUENCY RESOLUTION keys Qo the Frequency Resolution Light Bars should light one at a time and remain lit Rotate the TUNING control o clockwise and then counter clockwise and note that the digits displayed in the FREQUENCY display increase and then decrease in order as the TUNING control o is turned Perform this step as each of the four FREQUENCY RESOLUTION keys are pressed The first key on the left produces resolution in 100 MHz steps the second key 1 MHz steps the third key 10 kHz steps and the fourth key 1 kHz 2 kHz or 3 kHz steps depending
8. THIS INSTRU MENT into the Mains line voltage be sure the correct voltage and fuse have been selected Operating voltage is shown in madule window SELECTION OF OPERATING VOLTAGE 1 Open cover door pull the FUSE PULL lever and rotate to left Remove the fuse Remove the Line Voltage Selection Card Position the card so the line voltage appears at top left corner Push the card firmly into the slot Rotate the Fuse Pull lever to its normal posi tion Insert a fuse of the correct value in the holder Close the cover door Figure 2 1 Line Voltage and Fuse Selection Installation 2 9 Verify that the line voltage selection card and the fuse are matched to the power source Refer to Figure 2 1 Line Voltage and Fuse Selection 2 10 Power Cable BEFORE CONNECTING THIS IN STRUMENT the protective earth termi nals of this instrument must be connected to the protective conductor of the Mains power cord The Mains plug shall only be inserted in a socket outlet pro vided with a protective earth contact The protective action must not be negated by the use of an extension cord power cable without a protective conductor grounding 2 11 This instrument is equipped with a three wire power cable When connected to an appro priate ac power receptacle this cable grounds the instrument cabinet The type of power cable plug shipped with each instrument depends on the country of destination Refer to Figure 2 2 f
9. for two ranges of AM and six ranges of FM The two modu lation types can be used separately or together Program string syntax is as follows 10 80 90 Output Level Range OOH UND 3 dB Output Level Vernier Argument For AM Argument For FM MXNX Code For FM Code For AM 3 36 Programming ALC The ALC program string controls the functions of the RF ON OFF switch the ALC selector switch and the 10 dBm position of the output level RANGE switch The string con sists of the program code which is O the letter O followed by a single argument representing the de sired combination of the switch positions Each switch position has a numerical weight Compute the argument by adding the weights use the equal sign for a weight of 13 and the question mark for a weight of 17 Operation Table 3 8 Modulation OFF 6 or7 30 kHz 5 100 kHz 4 300 kHz 3 1MHz 2 1 9 3 MHz 10 MHz Weighting is as follows RF ON OFF switch ALC switch RANGE switch OFF 0 INT 0 0 dBm 0 ON 1 XTAL 4 10 dBm 2 MTR 12 Note that for the Synthesizer to achieve a 10 dBm RF output level the output level RANGE and VERNIER arguments must be set for 0 dBm and the ALC argument must be appropriate for 10 dBm output With RF OFF combinations of the other two switches results in arguments of 0 2 4 6 or 8 For RF ON possible argu
10. input into the Synthe sizer over the interface and the time it takes the Synthesizer to reach the desired output state The Synthesizer can typically accept data at rates up to 80 kbytes second This is generally a much shorter time than it then takes the Synthesizer to reach the desired output state If the controller and all other instruments on the bus are fast enough data trans fer is then only a small fraction of the total pro gram execution time Typical execution times for the various functions of the Synthesizer are as follows 1 10 MHz 1 MHz 100 kHz ERROR FROM DESIRED FREQUENCY U LOCK TIME 1 kHz 100 Hz Model 8672 a Frequency Switching The time it takes to switch from one frequency to the next depends on the largest frequency digit being changed Generally the smaller the digit being changed the shorter the switching time Typical switching times by largest digit being changed on the 2 0 to 6 2 GHz band are shown in Figure 3 6 below For higher bands actual digits being changed must be deter mined by dividing the output frequency by 2 6 2 to 12 4 GHz band or by 3 12 4 to 18 GHz band If FM is on during a frequency change switching time will increase 100 MHz mz 100 kHz m ee e enm pn pn b Output Level Programming Largest Digit Changed Time to be Within 1kHz Output range switching 10 dB steps 20 ms Output vernier switching 1 dB steps 10
11. percent modulation between 0 to 30 full scale is reached Fullscale is 1 Vpk 3 10 Model 8672A Table 3 4 Local Operating Instructions 3 of 4 E SETTING FREQUENCY MODULATION i Set front panel see Figure 3 1 controls and switches as follows METER MODE selector TM Connect a modulation source with a 50 ohm output impedance to the FM INPUT connector Set the oscillator s output to 0 Vrms and to the modulation frequency desired Set the FM DEVIATION MHz selector to the desired deviation range The peak deviation is shown on the Meter o The 0 03 0 8 and 3 ranges are indicated on the Meter o on the 0 to 3 scale and the 0 1 1 and 10 ranges are indicated on the 0 to 1 0 scale An FM input of 1 0 Vpk 0 707 Vrms represents full scale modulation Set the input level to obtain the desired deviation within the specified modulation index and deviation limits The FM annunciator OVERMOD will light to indicate that an over modulation condition exists This can occur if an input signal of greater than 1 Vpk is applied or if the maximum allowable modulation index is exceeded The STATUS BLOCK annunciator NOT PHASE LOCKED may also illuminate under conditions of excessive deviation SETTING EXTERNAL ALC WITH A POWER METER OR CRYSTAL DETECTOR 1 Set front panel see Figure 3 1 controls and switches as follows PEAK NORM control NORM detented ON Me
12. places the ALC loop in the center of its dynamic range Ma RE Um HUI vt t 3 12 bus when in remote or local Synthesizer s front panel controls are disabled and Model 8672A 3 16 REMOTE HP 1B OPERATION 3 17 The Synthesizer can be operated through the Hewlett Packard Interface Bus HP IB For further information about the HP IB refer to IEEE Stand ard 488 1975 the Hewlett Packard catalog and the booklet Improving Measurements in Engineering and Manufacturing HP Part No 5952 0058 Synthesizer compatibility programming and data format is described in the paragraphs which follow 3 18 Synthesizer Talk and Listen address and Parallel and Serial Poll response selection is de scribed in Section II 3 19 For Synthesizer remote checkout and trou bleshooting refer to the Remote Operator s Check and the HP IB Diagnositc Program in Section VIII The Remote Operator s Check verifies that the Synthesizer s functions can be programmed while the HP IB Diagnostic Program tests the Bus func tions of the Synthesizer 3 20 Compatibility 3 21 The Synthesizer is fully programmable with the HP IB Front panel functions except the LINE switch D see Figure 3 1 METER MODE selector PEAK NORMAL control and CAL control eo can be programmed 3 22 The programming capability of the Synthe sizer will be described in terms of the twelve bus messages found ins Table 3 5 3 23 Local Remote and Remote L
13. under the appropriate paragraph such as Options in Section I the Replaceable Parts List and the sche matic diagrams 1 15 Serial Numbers Attached to this instrument is a serial number plate The serial number is in the form 1234400123 The first four digits and the letter comprise the serial prefix The last five digits form the sequential suffix that is unique to each instrument The contents of this manual apply directly to instruments having the same serial num ber prefix es as listed under SERIAL NUMBERS on the title page 1 16 For information concerning a serial number prefix not listed on the title page or in the Manual Changes supplement contact your nearest Hewlett Packard office 1 17 MANUAL CHANGE SUPPLEMENTS 1 18 An instrument manufactured after the print ing of this manual may have a serial prefix that is not listed on the title page This unlisted serial pre fix indicates that the instrument is different from those documented in this manual The manual for this instrument is supplied with a yellow Manual Change supplement that contains change infor mation that documents the differences 1 19 In addition to change information the sup plement may contain information for correcting errors in the manual To keep this manual as cur rent and accurate as possible Hewlett Packard recommends that you periodically request the latest Manual Changes supplement The supple ment for this manual is keyed to
14. upon the frequency band Pressing the fourth key first will cause all four of the Frequency Light Bars to light Pressing the HOLD pushbutton causes the Light Bars to extinguish and prevents the TUNING control from changing the frequency displayed Connect a microwave frequency counter to the Synthesizer as shown in Figure 3 3 Set the RF switch to ON The ALC Block Qj annunciator LEV UNCAL should extiguish If the STATUS Block annunciator OVEN is extinguished the NOT PHASE LOCKED annunciator should also extinguish The Meter should indicate 10 dB E plo MHz OUT MICROWAVE MICROWAVE TEST OSCILLATOR A338 SYNTHESIZER TiME sase FREQUENCY COUNTER STEP 13 Figure 3 3 Operator s Frequency and Modulation Checks Test Setup Turn the OUTPUT LEVEL RANGE control clockwise through each of the thirteen positions 110 to 10 dBm At the 0 and 10 dBm positions and any other positions of interest vary the OUTPUT LEVEL VERNIER control from 10 to 3 dB In the 10 dBm range the VERNIER s range is specified only to 3 dBm output level but some Synthesizers may deliver more power The RF Block e annunciator OVER RANGE lights when the 10 dBm range is selected If the desired power cannot be produced the ALC Block o annunciator LEV UNCAL is illuminated 3 6 Model 8672A Operation Table 3 3 Local Operator s Checks 3 of 4 OPERATION Cont d Note the frequency o
15. when the Synthesizer is rack mounted Access to internal circuits and compo nents or the rear panel is possible without remov ing the Synthesizer from the rack Order HP part number 1494 0017 When this kit comes with the Synthesizer it is identified as Option 006 If the instrument rack mounting slides are to be mounted in a standard EIA rack then an adapter HP Part 1494 0023 is needed The slides without the adapter can be directly mounted in the HP system enclosures 1 50 Front Handle Kit Ease of handling is in creased with the front panel handles Order HP part number 5061 0089 1 51 Rack Flange Kit The Synthesizer can be solidly mounted to the instrument rack using this kit Order HP part number 5061 0077 1 52 Rack Flange and Front Handle Combina tion Kit This kit is not a front handle kit and rack flange kit packaged together The combination is made up of a unique part which includes both functions Order HP part number 5061 0083 1 53 COMPATIBILITY 1 54 The Synthesizer is compatible with HP IB as indicated by the following code AH1 C0 DTO L4 LEQ PP2 RL2 SH1 SR1 and TEQ explanation of the compatibility code may be Model 8672A found in the IEEE Standard 488 1975 IEEE Standard Digital Interface for Programmable Instrumentation 1 55 For more detailed information relating to programmable control of the Synthesizer refer to Section III in this manual
16. 1 Vpk Disconnect the test setup Set the ALC selector to INT METER MODE selector e to LEVEL and the OUTPUT LEVEL RANGE control to 10 dBm shown in the RANGE dBm display o Adjust the OUTPUT LEVEL VERNIER control for 0 dB on the Meter This will develop a 10 dBm level at the RF OUTPUT connector Operation Model 8672A Table 3 3 Local Operator s Checks 4 of 4 OPERATION Cont d 19 20 21 22 29 3 8 Set the RF switch to Adjust the CAL control e for a steady indication of the Meter o 3 This adjusts the loop gain and prevents unwanted oscillations The ALC Block annunciator LEV UNCAL lights when oscillations occur or the loop opens causing unleveling to occur Set the RF switch to OFF Disconnect the power meter and power sensor Connect a crystal detector as shown in Figure 3 4 Set the ALC selector to XTAL NOTE The output voltage from the crystal detector may be either negative or positive polarity Set the RF switch e to ON and adjust the CAL control eo for a steady indication on the Meter e Set the RF switch to OFF Disconnect the test setup ag PTT POWER MICROWAVE SYNTHESIZER f RECORDER METER POWER E L R SENSOR CRYSTAL step 2 DETECTOR SEI DI STEP 18 Figure 3 4 Operator s External ALC Checks Test Setup Model 8672A Operation Table 3 4 Local Operating Instructions 1 of 4 SETTING FREQUENCY AND OU
17. 3 3 provides general instructions for checking the operation of the Synthesizer via the front and rear panel controls 3 14 LOCAL OPERATING INSTRUCTIONS 3 15 Table 3 4 provides general instructions for operating the Synthesizer via the front and rear panel controls Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting the pro tective earth terminal is likely to make this instrument dangerous Intentional interruption is prohibited 3 1 Model 8672A Table 3 1 Front Panel Features 1 of 2 FRONT PANEL FEATURES RANGE LED display indicates the sign and selected range of the RF output in 10 dB steps from 110 to 10 dBm RANGE is determined by the set ting of the OUTPUT LEVEL RANGE selector or remotely programmed o Meter automatically ranges to one of three scales read according to position of METER MODE selector LEVEL 10 to 3 dB scale indication LEVEL ls determined by the setting of the OUTPUT LEVEL VERNIER control or remotely programmed and read relative to the RANGE dBm level displayed AM 0 to 3 scale is read 0 to 30 and the 0 to 1 scale is read 0 to 100 depending on the setting of the AM selector and displayed by the AM annunciator FM 0 to 3 scale is read 0 to 0 03 MHz 0 to 0 3 MHz and 0 to 3 MHz and the 0 to 1 scale read 0 to 0 1 MHz 0 to 1 0 MHz and 0 to 10 MHz Depends on the position of the FM DEVIA
18. ANDARD EXT connector 3210 and set the FREQ STANDARD INT EXT switch to Ext 2 Connect an external frequency standard of 5 or 10 MHz 0 dBm nominal into 50 ohms impedance to the FREQ STANDARD EXT connector 3 Set the LINE D switch to ON and the RF switch to ON 4 front panel display should indicate as follows STATUS annunciator INTERNAL REF OFF The NOT PHASE LOCKED annunciator may light if the external reference is not of sufficient accuracy in frequency or has an insufficient power level The external reference must be within 200 Hz of 10 MHz or 100 Hz of 5 MHz for reliable locking to occur 9 The Synthesizer may now be used for any of its normal operations SETTING AMPLITUDE MODULATION 1 Set front panel see Figure 3 1 controls and switches as follows METER MODE selector _ AM 1 2 Connect an oscillator with a 600 ohm output impedance to the AM INPUT connector Set the oscillator s output to 0 Vrms and to the modulation frequency desired 3 Set the AM Function switch to 30 or 100 The Meter o should indicate 0 on the 0 to 3 scale or 0 on the 0 to 10 scale 4 Set the OUTPUT LEVEL VERNIER control and OUTPUT LEVEL RANGE contro to the level desired from the RF OUTPUT connector QJ The OUTPUT LEVEL VERNER control should be set to 0 dB or below for least distortion 5 Inerease the oscillator s output uni the desired
19. BON CONNECTOR Logic Levels The Hewlett Packard Interface Bus logic levels are TTL compatible i e the true 1 state is 0 0 Vdc to 0 4 Vdc and the false 0 state is 2 5 Vdc to 5 0 Vdc 1 Programming and Output Data Format Refer to Section III Operation Mating Connector HP 1251 0293 Amphenol 57 30240 Mating Cables Available HP 10631A 0 9 metres 3 ft HP 10631B 1 8 metres 6 ft HP 10631C 3 7 metres 12 ft Cabling Restrictions 1 AHewlett Packard Interface Bus System may contain no more than 1 8 metres 6 ft of connecting cable per instrument 2 The maximum accumulative length of connecting cable forany Hewlett Packard Interface Bus System is 20 0 metres 65 6 ft Figure 2 4 Hewlett Packard Interface Bus Connection Model 8672A Installation Tahle 2 1 USA Standard Code for Information Interchange ASCII or BI fo NOTE 1 HP IB valid LISTEN addresses NOTE 2 HP IB valid TALK addresses NOTE 3 Logic 1 0 2 24 Rack Mounting WARNING The Synthesizer is heavy for its size 27 2 kg 60 Ib Care must be exercised when lifting to avoid personal injury Use equipment slides when rack mounting 2 25 Rack Mounting information is provided with the rack mounting kits If the kits were not ordered with the instrument as options they may be ordered through the nearest Hewlett Packard office Refer to the paragraph entitled Options in Section I 2 26 STORAGE AND
20. Bm to i 20 dBm from 15 C to 35 c The RE output level aiso changes when options axe combined When Options 001 and 008 are combined the RF output level specification is 10 to 10 dBm When Options 004 and 008 axe combined the RF output level specification is 7 dBm to 120 dBm How ever when Options 005 and 008 are combined the RF output level specification is 9 dBm to LO dBm T applies for internal leveling only 8 specification includes allowances for meter accuracy typically 0 50 dB detector linearity temperature flatness attenuator accuracy and measurement uncertainty but the attenuator accuracy and the measurement error can be calibrated out with a power meter at fixed vernier settings 9 ror Option 004 and 005 instruments total indicated meter accuracy and flatness are degraded by an additional 0 25 dB 10 Typically X 10 ms for any change on same output level range llon the 0 dBm and 10 dBm output level range specification applies only at the RF output frequency 1 3 General Information Model 8672A Table 1 1 Specifications 3 of 4 AMPLITUDE MODULATION CHARACTERISTICS Depth for meter readings 0 dBm and below 15 C to 350 0 75 from 2 0 6 2 GHz 0 60 from 6 2 12 4 GHz 0 50 from 12 4 18 0 GHz Rates 3 dB bandwidth 10 Hz 100 kHz Frequency Response 100 Hz 10 kHz rates 0 25 dB Sensitivity percent AM per Vpk 30 V and 100 V ranges Maximum in
21. CABLE HP 8120 1351 The number shown for the plug is the industry identifier for the plug only The number shown for the cable is an HP part number for a complete cable including the plug Figure 2 2 Power Cable and Mains Plug Part Numbers 2 2 Model 8672A 1 Address and Parallel Poll Response Selection cont d Figure 2 3 The HP IB ADDRESS SELECT switch settings for 52 and 53 are in the octal code For example the factory selected addresses are set to 23 binary 10 011 equivalent to bits b5 through bi on the table Therefore the listen address is 3 and the talk address is S f The PARALLEL POLL SENSE switch S4 is set to either the OFF 0 zero or 1 one position In the zero position the less positive level indicates an affirmative response to the poll g The PPR Parrallel Poll Response switch S1 is set to select one of eight lines one of 1 through 8 The selected line passes the Synthesiz er s response to the parallel poll to the HP IB controller h Re install the A2A9 Assembly i Replace the A2 Assembly s internal cover and the Synthesizer s top cover j Connect the line Mains power cable to the Line Power Module connect the HP IB cable to the HP IB connector 2 15 Interconnections 2 16 Interconnection data for the Hewlett Packard Interface Bus is provided in Figure 2 4 HP IB ADDRESS SELECT Installation 2 17 Mating Connectors
22. FREQ STANDARD Input A3J10 normally nected by A3W3 to A3J9 Also used to connect an external frequency standard of 5 or 10 MHz at 0 dBm to the Synthesizer Line Power Module permits operation from 100 _ 120 220 or 240 Vac The number visible in the window displays the nominal line Mains voltage for which the Synthesizer is set see Figure 2 1 The pro t ctive grounding conductor connects to the Synthe syzer through this module The line power fuse A3F1 is part of this module and is the only part to be changed by the operator Figure 3 2 Rear Panel Connectors Switches and Displays Model 8672A Operation Tahle 3 3 Local Operator s Checks 1 of 4 INITIAL CONDITIONS 1 Check that the LINE switch 12 is in STANDBY and remove the power cable from the Line Power Module see Figure 3 2 2 Check that Line Power Module see Figure 3 2 is set to the nominal line voltage to be used and that the fuse is the correct value and type 3 Set the front panel controls and switches as follows AM selector OFF ALC selector INT ity FM DEVIATION MHz selector OFF Hl OUTPUT LEVEL VERNIER control fully cew OUTPUT LEVEL RANGE control fully cew PEAK NORM switch NORM detented RF switch OFF METER MODE selector LEVEL 4 Set the rear panel controls and cables as follows FREQ STANDARD INT EXT switch Jumper Connects A3J9 to 3310 OPERATION Piy 1 Setthe
23. HP 8672 OPERATING INFORMATION 8672A SYNTHESIZED SIGNAL GENERATOR Hewlett Packard Co 1977 1978 1980 PACKARD JUNE 1980 BC HEWLETT 6198 dH General Information Model 8672A MODEL 8672A EXTENDER BOARDS LINE POWER CABLE NOTE See ACCESORIES SUPPLIED in Section I forznore details H Figure 1 1 Model 8672 and Accessories Supplied Model 8672A General Information SECTION I GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This manual contains information pertinent to installation operation testing adjusting and servicing the Hewlett Packard Model 8672A Synthesized Signal Generator The Model 8672A wil generally be referred to as the Synthesizer throughout this manual 1 3 Information pertaining to the Hewlett Packard Interface Bus HP IB as it relates to the Synthe sizer is found in various sections of this manual Section VIII contains a diagnostic program for checkout of HP IB functions A remote operator s check is also found in Section VIII 1 4 Figure 1 1 shows the Synthesizer with all sup plied accessories 1 5 Packaged with this manual is an Operating Information Supplement This is simply a copy of the first three sections of this manual This supple ment should stay with the instrument for use by the operator Additional copies may be ordered separately through your nearest Hewlett Packard office The part number is listed on the t
24. SHIPMENT 2 27 Environment 2 28 The instrument should be stored in a clean dry environment The following environmental limitations apply to both storage and shipment 55 C to 75 C Humidity ur TAVERN lt 95 relative Altitude lt 15 300 metres 50 000 feet 2 5 Installation 2 29 Packaging 2 30 Original Packaging Containers and materials identical to those used in factory packaging are available through Hewlett Packard offices 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 Also mark the container FRAGILE to assure careful handling In any cor respondence refer to the instrument by model number and full serial number 2 31 Other Packaging The following general instructions should be used for re packaging with commercially available materials a Wrap the instrument in heavy paper or plastic If shipping to a Hewlett Packard office or Model 8672A service center attach a tag indicating the service required return address model number and full serial number b Use a strong shipping container A double wall carton made of 2 4 MPa 350 psi test material is adequate c Use enough shock absorbing material 15 to 100 mm layer 3 to 4 inches around all sides of instrument to provide firm cushion and prevent movement in t
25. TION MHz selector and is displayed by the FM annunciator RF annunciato ON OFF indicates when the RF OUTPUT the RF switch is enabled or disabled controlled by or remotely programmed 1 OVER RANGE indicates when the 10 dBm range is selected or remotely programmed ALE annunciator indicates whether the ALC Auto matic Level Control is INT internal external XTAL crystal or external MTR Power Meter as deter mined by the position of the ALC selector LEV UNCAL indicates an unleveled output or an il legal range was programmed remotely lt 110 dBm 1 Vpk at the FM INPUT connector or that the modulation index is greater than 5 10 or 15 depend ing on the band FREQUENCY MHz LED display indicates the se lected frequency Frequency Resolution Light Bars indicate the fre quency tuning resolution selected by the FRE QUENCY RESOLUTION keys The first light bar indicates 100 MHz resolution the second indicates 1 MHz the third indicates 10 kHz and the fourth indicates 1 kHz resolution The light bars to the left of the one selected will also light STATUS Block annunciators display the internal conditions of the Synthesizer OVEN when lit indicates that the crystal oven is not up to operating temperature OUT OF RANGE when lit indicates an out of range illegal frequency has been remotely pro grammed REMOTE when lit indicates the Synthesizer is set t
26. TPUT LEVEL 1 Be sure the Synthesizer is set to local Make sure the internal reference is selected or an externai reference is connected to A3J10 Set front panel controls and switches to the following positions uneswith o FREQUENCY RESOLUTION keys toresolution desired and displayed on Frequency Resolution Light Bars TUNING control to frequency desired as displayed on Frequency readout HOLD pushbutton press pushbutton the frequency desired is not heid OUTPUT LEVEL RANGE control 0 RANGE dBm display RF switeh zcv o UL c aee OUTPUT LEVEL VERNIER control OdBon Meter 2 This sets power level of 0 dBm at the RF OUTPUT connector e 0 dBm 0 dB 0 dBm Output Level Output Level Available Output Range Vernier Power Set the OUTPUT LEVEL RANGE control to indicate 10 dBm in the RANGE dBm display Adjust the OUTPUT LEVEL VERNIER control T to indicate 5 dB on the Meter This sets an output power level of 15 dBm at the RF OUTPUT connector e 10 dBm 5 dB 15 dBm The indication on the Meter o plus the reading on the RANGE dBm display o equals the power level at the RF OUTPUT connector 3 9 Operation Model 8672A Table 3 4 Local Operating Instructions 2 of 4 USING AN EXTERNAL STANDARD l Onthe rear panel see Figure 3 2 remove Jumper o A3W3 from the FREQ ST
27. al reference must be used The performance of the external reference should at least match the specifications General Information and in particular the frequency accuracy and spectral purity of the HP Model 10544C Crystal Oscillator When using an external oscillator microphonics or line related spurious signals may increase 1 62 An external signal source is required if amplitude or frequency modulation is desired For AM the source should have a variable output of 0 to 1 Vpk into 600 ohms modulation rates up to 100 kHz and distortion of lt 1 For FM the source should have variable output of 0 to 1 Vpk into 50 ohms modulation rates up to 10 MHz and distortion of lt 1 The HP 651B and 654A test oscillators are adequate for modulating the Synthe sizer and meet the stated requirements 1 63 A remotely programmable audio source would be convenient for full remote control of modulation levels and rates 1 64 EQUIPMENT AVAILABLE 1 65 The Synthesizer has an HP IB interface and can be used with any HP IB compatible computing controller or computer for automatic systems applications 1 66 The 11712A Support Kit is available to aid the user in maintaining and servicing the Synthe sizer It consists of cables adaptors terminations prerecorded programs extender boards and a test extender board _ 1 67 The prerecorded programs are on tape cas settes and are for use with the HP 9830A and HP 9825A Computing
28. be described in detail in the following paragraphs 10 GHz 1 GHz i MHz 100 kHz 10 kHz 1 kHz EXECUTE 3 33 Programming Frequency The Synthesizer accepts any frequency within its range to 8 signi ficant digits Above 6 2 GHz the 1 kHz digit is rounded up or down to be compatible with the 2 kHz or 3 kHz resolution Use Figure 3 5 and Table 3 6 to write the program string with the following syntax 9 THROUGH 9 FREQUENCY aie Within the Synthesizer frequency information is stored in two blocks of four digits each One block CX XCX is for the 10 GHz through 10 MHz digits the other block is for the 1 MHz through 1 kHz digits Pro Stands For Frequency Execute Code oa Si nds For Procram Code gramming within one block does not change the Most Significant Digit Being Programmed other block unless it is necessary for the Synthe sizer to round off the 1 kHz digit for frequencies above 6 2 GHz Figure 3 5 illustrates this use it as a guide to make Frequency programming easier 3 15 Operation Model 8672A FREQUENCY FREQUENCY PROGRAM ARGUMENTS CODES x X AX L a xX pil 2S 2S AS x ADDRESS qe 4 lt 9 X W 9 uns 1 100 o o 1 HH GHz MHz kHz means that for a given program code this digit will change to zero if not programmed
29. be performed at any frequency be tween 10 Hz and 100 kHz 1 5 1 39 General Information 1 31 FM peak deviation can be set using the front panel meter At output frequencies below 6200 MHz peak deviation is limited to 10 MHz or five times the modulation frequency whichever is lower From 6200 to 12 400 MHz peak devia tion is limited to the lesser of 10 MHz or ten times the modulation frequency from 12 400 to 18 000 MHz the lesser of 10 MHz or fifteen times the modulation frequency Usable modulation rates fall between 50 Hz and 10 MHz Six ranges of de viation sensitivity are selectable either by the front panel switches or via remote programming 1 32 Miscellaneous Outputs and Indicators 1 33 The front panel meter indicates output level AM depth or FM peak deviation The meter mode is selected by a front panel switch 1 34 External leveling is selected by a front panel switch A power meter or crystal detector may be used as the leveling loop detector 1 35 Phase locked reference outputs of 10 and 100 MHz are available on the rear panel 1 36 Six front panel status indicators make the Synthesizer operation easier and aids in reducing possible operator error 1 37 1 38 The Synthesizer is fully programmable via the Hewlett Packard Interface Bus In the remote mode all front panel controls are disabled except the LINE and METER MODE switches Remote Operation The output level is selected in 1 dB step
30. cally The contents of the shipment should be as shown in Figure 1 1 Procedures for checking electrical performance are given in Section IV If the contents are incomplete if there is mechanical dgmage or defect or if the instru ment does not pass the electrical performance test notify the nearest Hewlett Packard office If the shipping container is damaged or the cushioning material shows signs of stress notify the carrier as well as the Hewlett Packard office Keep the shipping materials for the carrier s inspection 2 5 PREPARATION FOR USE 2 6 Power Requirements 2 1 The Synthesizer requires a power source of 100 120 220 or 240 Vac 5 to 10 48 to 60 Hz single phase for Option 003 instruments 400 Hz single phase and 120 Vac 5 10 only Power consumption is approximately 300 volt amperes This is a Safety Class I product pro vided with a protective earthing termi nal An uninterruptible safety earth ground must be provided from the main power source to the product input wir ing terminals power cord or supplied power cord set Whenever it is likely that the protection has been impaired the product must be made inoperative and be secured against any unintended operation If this instrument is to be energized via an autotransformer for voltage reduc tion make sure the common terminal is connected to the earthed pole of the power source Line Voltage and Fuse Selection BEFORE PLUGGING
31. ed by the AM selector or as programmed o remotely Percent modulation varies linearly with the input signal OUTPUT LEVEL VERNIER adjusts the RF output level over the range of 3 to 10 dB relative to the Output Level Range as read on the Meter e The Vernier function is programmable in 1 dB steps EXT ALC INPUT connector accepts positive or nega tive leveling signals from either a power meter or crys tal detector as selected by the ALC selector Mechanical Meter Zero sets meter suspension so the Meter indicates zero when power is removed from the Synthesizer and the Synthesizer is in its nor mal operating position CAL control adjusts the ALC gain to match the ex ternal leveling device in use The CAL control must be returned to the fully clockwise position when the Synthesizer is returned to internal leveling OUTPUT LEVEL RANGE selects the RF output level range in 10 dB steps from 10 to 110 dBm The selected range is displayed by the RANGE dBm LED readout The range may also be pro grammed remotely PEAK NORM control generally left in the NORM detented position fully clockwise It is used to peak the RF output at a particular frequency in the band at the expense of power at other frequencies RF OUTPUT connector 50 ohm type N female con nector supplies the RF output over the entire fre quency range of 2 to 18 GHz RF switch completely turns off the RF ou
32. elated and Spurious Levels At Frequency Frequency Offset fo From Carrier Fc fg 300 Hz i300 Hz lt lt 1 kHz fo gt i kHz 50 dBe 60 dBe 2 0 6 2 6 2 12 4 12 4 18 0 RARE stunts Power Line Related and Spurious Due to fan rotation within 5 Hz below line frequency and multiples Option 003 only 400 Hz operation Carrier Power Line Related and Spurious Levels at Frequency Frequency Offset f from Carrier Fo Range GHz fg 2 kHz 2kHz lt 1 lt 8 2 28 kHz Single Sideband Phase Noise 1 Hz BW CW mode SSB Phase Noise Ratio in 1 Hz BW CW mode at Specified Offset Frequency 2 0 6 2 58dB 70dB 18dB 86dB 6 2 12 4 52dB 64dB 72dB 80dB 12 4 18 0 48dB 60dB 68dB 76 dB referenced to carrier dBc Frequency Range GHz 1 Reference is kept at operating temperature in STAND BY mode with the instrument connected to Mains power For instruments dis connected from Mains power less than 24 hours the aging rate is 5 1071 day after a 24 hour warmup 2 Overall accuracy of the internal reference oscillator is a function of time base calibration aging rate temperature effects line voltage effects Typical temperature and line voltage effects are lt 1 x 107 c and lt 5 x 10 19 5 10 line voltage change Stability and spectral purity will be partially deter
33. first ad dressed to listen The Remote message is the means by which the controller sets the remote enable line REN true Some controllers send this message automatically when first turned on or reset 1 3 48 Receiving the Local Message 3 49 The Synthesizer returns to local front panel control when it receives the Local message The frequency will not change from the last program med value but the other functions will correspond to the front panel control settings 3 50 Receiving the Local Lockout Message 3 51 The Synthesizer does not respond to the Local Lockout message STATUS BYTE Stm 3 7 Dest Value 18 OUT OF RANGE CRYSTAL RSV Function OVEN REQUEST COLD SERVICE frequency Operation 3 52 Receiving the Clear Lockout Set Local Message m 3 53 The Synthesizer responds to the Clear Lockout Set Local message in the same way as to the Local message that is it returns to local The Synthesizer need not be addressed to listen This message sets the REN line false 3 b4 Receiving the Pass Control Message 3 55 The Synthesizer does not respond to the Pass Control message as it cannot act as a controller 3 56 Sending the Require Service Message 3 57 The Synthesizer sends the Require Service message to the controller when one of the follow ing conditions exists for more than 50 ms 1 Not phase locked with RF power on 2 Frequency programmed out of range 3 RF po
34. ghts and the VER NIER resets to 10 dB Nothing else will change from the front panel control settings until the Synthesizer receives a data message string Once in remote the synthesizer can be addressed to talk re addressed to listen programmed to return to local or unaddressed with the universal Unlisten address or Abort message 3 27 Programming the Remote to Local Mode Change The Synthesizer will return to local when the Local or Clear Lockout Set Local messages are sent by the controller The Clear Lockout Set Lo cal message sets the remote enable line REN false 3 28 Data Messages 8 29 The Synthesizer communicates on the bus primarily with data messages It responds to data messages that program frequency output level modulation and ALC configuration It sends a byte that describes its status Data messages consist of one or more bytes sent over the bus 8 data lines when the bus is in the data mode attention line ATN false The Synthesizer receives data mes sages when addressed to listen and sends a status byte when addressed to talk 3 30 Receiving Data Messages 3 31 The Synthesizer can receive Data messages when addressed to listen The Data message string or program string consists of one or more ASCII characters arranged as a program code followed by arguments The codes and arguments for a given function need not be on the same program line 3 32 Data Input Format The program string syn
35. he HOLD switch clears any frequency resolu tion selected D TUNING control changes the Synthesizer s output frequency by the increments selected by the FRE QUENCY RESOLUTION selectors D selects OFF 30 V or 100 V modulation by a signal applied to the AM INPUT connector The selected range is display ed on the AM annunciator Modulation per centage is read on the Meter when the METER MODE selector is set to AM AM may be re motely programmed FM INPUT connector accepts a maximum 1 Vpk external modulation signal 509 source impedance Deviation varies linearly with the input signal Devia tion ranges are controlled by the FM DEVIATION switch or remotely programmed ALC switch selects either internal INT leveling external erygtal XTAL or external power meter PWR MTR leveling The external leveling device crystal or power meter may have either a positive or negative output The ALC selector can be remotely programmed FM DEVIATION MHz switch selects the meter scale and peak deviation that is obtained with a signal applied to the FM INPUT connector The peak deviation range is displayed on the FM annunciator and the actual peak deviation is read from the selected scale on the Meter 2 The FM DEVIA TION MHz selector can be remotely programmed AM INPUT connector accepts a maximum 1 Vpk external modulation signal 600 ohm impedance A 1 Vpk signal develops full scale modulation as se lect
36. he container Protect the control panel with cardboard d Sealthe shipping container securely e Mark the shipping container FRAGILE to assure careful handling Model 8672A Operation SECTION OPERATION 3 1 INTRODUCTION 3 2 This section explains how to operate the Synthesizer Included in this section are descrip tions of all front and rear panel controls connec tors and indicators operator s checks operating instructions and operator s maintenance 3 3 Local operating instructions begin with para graph 3 10 Remote operation with the Hewlett Packard Interface Bus HP IB is explained begin ning with paragraph 3 16 3 4 PANEL FEATURES 3 5 The front and rear panel features of the Synthesizer are shown in Figures 3 1 and 3 2 and are described in Tables 3 1 and 3 2 The tables contain detailed descriptions of the controls con nectors and indicators 3 6 OPERATOR S MAINTENANCE 3 7 The only maintenance the operator should normally perform is the replacement of the pri mary power fuse F1 located in the Line Power Module Assembly A3A11 shown in Figure 3 2 and the mechanical zero adjustment of the meter shown jn Figure 3 1 For instructions on how to change the fuse refer to Section II Line Voltage Selection 3 8 Mechanical Meter Zeroing 3 9 To mechanically zero the front panel meter see Figure 3 1 set the LINE switch to a the STANDBY position and place the Synthesizer
37. itle page of this manual 1 6 On the title page of this manual below the manual part number is a Microfiche part num ber This number may be used to order 100 x 150 mm 4 x 6 ipch microfilm transpar ncies of the manual Each microfiche contains up to 96 photo duplicates of the manual pages The micro fiche package also includes the latest Manual Changes supplement as well as all pertinent Service Notes _ 1 7 SPECIFICATIONS 1 8 Instrument specifications are listed in Table 1 1 These specifications are the performance standards or limits against which the instrument may be tested 1 9 SAFETY CONSIDERATIONS 1 10 This product is a Safety Class I instrument provided with a protective earth terminal The in strument and manual should be reviewed for safety markings and instructions before operation 1 11 The Synthesizer and all related documenta tion must reviewed for familiarization with safety markings and instructions before operation Refer to the Safety Considerations page found at the beginning of this manual for a summary of the safety information 1 12 Safety information pertinent to the task at hand installation operation performance testing adjustments or service is found throughout this manual 1 13 INSTRUMENTS COVERED BY MANUAL 1 14 Options Electrical options 001 002 003 004 005 and various mechanical options are docu mented in this manual The differences are noted
38. mediately after a frequency change the status byte can be used to determine when the Synthesizer has re acquired lock A frequency change might be followed by a status byte sequence of 72 72 and then 64 indicating the Synthesizer is now locked 3 62 Sending the Status Bit Message 3 63 The Synthesizer outputs a status bit on one of the Bus data lines in response to a parallel poll 3 20 Model 8672A see controller manual The line is switch select able see Section II as is the level of the bit s logic The status bit represents the RSV bit of the status byte 3 64 Receiving the Abort Message 3 65 The Synthesizer stops talking or listening when it receives the Abort Message 3 66 Programming Quick Reference Guide 3 67 Table 3 10 shows program string syntax program codes and arguments and the status byte Al possible program codes including equivalent duplicates are shown but the recommended codes are indicated with boldface type 3 68 Programming Examples 3 69 Figure 3 7 is a flowchart showing how to program all of the Synthesizer functions and the twelve bus messages in HPL 9825 computing con troller and BASIC 9830 computing controller Model 8672A Operation Table 3 10 Programming Quick Reference Guide PROGRAM STRING SYNTAX fo Level meug pae Modulation u een Talk Frequency Range Vernier AM FM ALC Synthesizer Listen f CX XCX CX CX
39. ments are in the following table Table 3 9 ALC Arguments with RF ON ju INT 1 XTAL MTR In general an even argument results in the RF ON OFF switch being set OFF while an odd argu ment results in RF ON with the other switch com binations as shown in the table LI 3 37 Optional Program Codes The Synthesizer interprets any ASCII character in columns 4 and 5 of Table 2 1 as a program code The two columns are equivalent for example it will respond the same way to Z as it does to J The Synthe sizer ignores all other characters 3 38 Abbreviated Program String The Synthe sizer accepts and processes the characters of a pro 3 17 Operation Receiving Data Messages Cont d gram string in a left to right sequence It also auto matically counts program codes in the sequence shown in Table 2 1 columns 4 and 5 This sequence is equivalent to the program string order shown in paragraph 3 32 If done in that sequence program strings for level modulation and ALC can be written like those for frequency The program string will consist of the program code for the first function being programmed followed by arguments for all functions as shown below Argument For Range Argument For Vernier Argument For AM Argument For FM es For ALC KXXXXX Es Program Code For Range 3 39 Programming Execution Time Programming execution time is determined by two parameters the rate at which data can be
40. mined by characteristics of external reference oscillator 3 xternal FM signals at rates 100 kHz must be disconnected 1 2 Model 8672A a General Information Table 1 1 Specifications 2 of 4 RF OUTPUT CHARACTERISTICS Level 3 to 120 dBm 15 C to 35 C556 Total Indicated Meter Accuracy 15 C to 435 C 7 8 9 Indicated Meter Accuracy at OUTPUT LEVEL RANGE Switch Setting 0 10 dBm 20 dBm 30 dBm and Below No Attenuation 1 75 dB Frequency Range GHz 2 0 6 2 2 25 dB 2 45 dB 175 dB 0 3 dB 10 dB step below 0 dBm range 2 0dB 0 3 dB 10 dB step below 0 dBm range 2 25 dB 0 4 dB 10 dB step below 0 dBm range 6 2 12 4 2 0 dB 2 5 dB 2 7 dB 12 4 18 0 2 25 dB 2 85 dB 3 05 dB Remote Programming Accuracy 8 0 75 dB better than meter accuracy indicated above Flatness 0 dBm range 15 to 35 C 0 75 dB 2 0 6 2 GHz 1 00 dB 2 0 12 4 GHz 1 25 dB 2 0 18 0 GHz Output Level Switching Time lt 20 ms Impedance 50 ohms Source SWR 2 5 5 Additional power available on 10 dBm range overrange but for power settings above 3 dBm spurious oscillations may degrade performance Option 001 instruments output level specification changes to 5 to 10 dBm from 15 to 35 for Option 004 42 0 dBm max Option 005 4 to 10 dBm from 15 to 35 or for Option 008 8 d
41. ms RF ON OFF switch ON 380 ms RF ON OFF switch OFF 5ms c Modulation Programming FM range change and frequency change in FM mode s oed pibe aro dapi 50 ms AM range change nn nn 15 ms NOTE SWITCHING TIMES ARE TYPICALLY MUCH SHORTER PARTICULARLY FOR SMALL STEP SIZES 11 i SWITCHING TIME 12 13 14 15 TIME ms Figure 3 6 Typical frequency switching time showing WORST CASE lock and settling times 3 18 Model 8672A 3 40 Sending Data Messages 3 41 The Synthesizer sends a status byte when addressed to talk This byte is the Synthesizers response to a serial poll which will be explained in paragraph 3 59 The Synthesizer will talk when in local as well as remote 3 42 Receiving the Trigger Message 3 43 The Synthesizer doesn t respond to the Trigger message 3 44 Receiving the Clear Message 3 45 The Synthesizer responds to the Clear message by setting the frequency to 3 GHz ALC to internal RF power off and modulation off This message can take two forms Device Clear which the Synthesizer responds to when not ad dressed and Selected Device Clear which the Synthesizer responds to when addressed to listen The Device Clear messages do not affect addressing 3 46 Receiving the Remote Message 3 47 The Synthesizer is enabled to go into remote when the controller sends the Remote message but does not actually switch to remote until
42. n the FREQUENCY MHz display Q Set the LINE switch o to the STANDBY position The STATUS Block annunciator STANDBY should light Leave the Synthesizer in the standby condition for several seconds Set the LINE switch to ON The FREQUENCY MHz display should display the same frequency as was displayed in step 7 The STATUS Block annunciator STANDBY should extinguish Apply power to the test oscillator set the frequency to 10 kHz and the output level to 0 Vrms Connect the test setup as shown in Figure 3 3 Set the METER MODE selector to AM and the AM selector D to 100 The AM annunciator 100 should be lit Increase the output of the test oscillator slowly from 0 0 t approximately 0 8 Vrms As the Meter o approaches full scale the ALC Block annunciator LEV UNCAL should illuminate The LEV UNCAL annunciator is being used in this test as a modulation indicator Normally having this annunciator illuminate indicates excessive modulation Set the AM selector 15 to OFF reduce the test oscillator s output to 0 Vrms and remove the cable from the AM INPUT connector Set the test oscillator s frequency to 100 kHz Set the METER MODE selector FM and the FM DEVIATION MHz selector QD to 3 The FM annunciator Q 3 will light Increase the test oscillator s output from 0 Vrms to approximately 0 5 Vrms The FM annunciator Q OVERMOD will light when there is excessive deviation or an input signal greater than
43. o remote operation by an HP IB controller STANDBY when lit indicates that power is ap plied but the LINE switch D is in the STAND BY position NOT PHASE LOCKED indicates that one or more of the phase lock loops are unlocked or the RF switch o is in the OFF position INTERNAL REF OFF when lit indicates when the rear panel INT EXT switch see Figure 3 2 is in the EXT position AM annunciator indicates OFF 30 or 100 modu lation range as determined by the AM selector or BETON HOLD key disables the TUNING control on the front panel and extinguishes the Frequency Resolu annunciator indicates OFF 0 03 0 1 0 3 1 3 Vok Deyi tion Light Bars 3 m and 10 MHz deviation range for 1 Vpk Deviation range is determined by the position of the FM DEVI ATION MHz selector o or remotely programmed PRESET key 3 GHz sets frequency to 3 GHz and OVER MOD indicates an input signal greater than extinguishes the Frequency Resolution Light Bars 15 AM function switch Model 8672A Operation Table 3 1 Front Panel Features 2 of 2 12 LINE switch applies power to the Synthesizer when set to the ON position power is supplied to the crystal oven and the battery charger circuit in the STANDBY position FREQUENCY RESOLUTION pushbuttons selects tuning resolution 100 MHz 1 MHz 10 kHz or 1 2 or 3 kHz steps depending on the frequency selected T
44. ocal Mode Changes 3 24 The Synthesizer can communicate over the In remote the the Synthesizer can be addressed to talk or listen When addressed to listen the Synthesizer will re spond to the Data Clear SDC Local and Clear Lockout Set Local When addressed to talk the Synthesizer automatically stops listening and sends a status byte over the eight data lines Also the Synthesizer can send a service request SRQ and respond to serial and parallel polis and the Abort message In local the Synthesizer is fully con trolled by the front panel but it will respond to serial or parallel polls it s talk address and it will send a service request SRQ 3 25 Addressing The Synthesizer interprets the byte on the bus eight data lines as an ASCII ad Operation dress or command if the remote enable line REN is true and the bus is in the command mode atten tion line ATN true and interface clear line IFC false The Synthesizer s talk and listen addresses are switch selectable as described in Section Referring to Table 2 1 characters in columns 2 or 3 are valid listen addresses characters in columns 4 and 5 are talk addresses and characters in column 1 are commands device clear DC serial poll en able SPE and serial poll disable SPD 3 26 Programming the Local to Remote Mode Change The Synthesizer will switch to remote only when addressed to listen When first switched to remote the REMOTE lamp li
45. ogram output level of 14 dBm CAT vna Program 3096 AM cH Lae i18 CH STOF Program INT ALC PAER a EPEL Send SDC or DEL command to preset synthesizer to 3 GHz internal ALC modulation off i28 CME US p38 FORMAT 3b 148 313832560 4o mig Figure 3 7 Programming Examples 1 of 2 Model 8672A Operation LocaL Message 158 CMD 703 168 FORMAT 3B 170 OUTPUT 13 158225651 5121 ehe Send GTL command to return synthesizer to local lel 719 CHI TU IF STATIS lt 1 THEN 999 Service request on Bus Y i Gu gus e It DEG e if bit 7 rds 7 gto poll mag CHI LS 518 FORMAT SE Initiate Serial Poll puts eee OUTPUT i2 S1ED225 IT I 46 423 poll rds 719 gt S synthesizer status byte CHD 759 into variable S cC Cu En H H ivi FEM CHI ULP FORMAT 3E OUTPUT 13 ES iun emen on ow EOF CB CER 6 PUO e RN Om 2 Message cli 7 or Press RESET key Stop the synthesizer from talking or listening Press STOP key Figure 3 7 Programming Examples 2 of 2 3 23 3 24 723 NLETT P SKARD HP Part No 08672 90064 Printed in U S
46. or the part numbers of the power cable available 220 280V OPERATION PLUG NZSS 198 AS C112 CABLE HP 8120 1368 PLUG SEV 1011 1959 24507 TYPE 12 CABLE HP 8120 2104 220 240V OPERATION PLUG CEE7 VII CABLE HP 8120 1689 220 240V OPERATION PLUG NEMA 5 15 CABLE 8120 1578 PLUG CEE22 V1 CABLE HP 8420 1860 Model 8672A 2 12 HP IB Address and Parallel Poll Response Selection 2 13 In the H the HP IB talk and listen addresses and the parallel poll sense and response line are switch selectable The following procedure explains how the switches are to be set Refer to Table 2 1 for a listing of the talk and listen address 2 14 To change the HP IB address or to select a different parallel poll response the top cover of the Synthesizer and the internal A2 AssembIy 5 cover must be removed a Disconnect the line Mains power cable b Remove any HP IB cables or connectors from the HP IB connector c Remove the Synthesizer s top cover and the A2 Assembly s protective cover Refer to the Disassembly and Reassembly Procedures in Section VIII d If the parallel poll sense or response switches are to be changed remove the A2A9 Board Assembly e Select the new address as shown in Table 2 1 The location of the switches are shown on 220 240V OPERATION 100 120V OPERATION PLUG NEMA 6 15P CABLE HP 8120 0698 220 240V OPERATION 220 240V OPERATION PLUG BS 1363A
47. plus the 10 dB of overrange AM Modulation OFF 30 Vpk and 100 Vpk ranges FM Modulation OFF 30 100 300 kHz Vpk 1 3 10 MHz Vpk ranges Other RF ON RF OFF ALC INT ALC EXT XTAL ALC EXT PWR MTR Programming Format HP IB Hewlett Packard Interface Bus GENERAL CHARACTERISTICS Operating Temperature Range 0 to 55 C Leakage Meets radiated and conducted limits of MIL I 6181D 1 20 DESCRIPTION 1 21 The HP Model 8672A Synthesized Signal Generator has a frequency range of 2000 to 18 000 MHz The output is leveled and calibrated from 3 to 120 dBm AM and or FM modulation modes can be selected The frequency output level mod ulation modes and most other modes or functions can be remotely controlled using the HP IB pro gramming format 4 1 22 Frequency 1 23 Frequencies from 2000 to 18 000 MHz overrange to 18 599 997 MHz can be tuned from the front panel Minimum resolution is 1 kHz from 2000 to 6199 999 MHz 2 kHz from 6200 to 12 399 998 MHz and 3 kHz from 12 400 002 to 18 000 MHz Tuning resolutions of 100 MHz 1 MHz 10 kHz or 1 kHz minimum are selected by front panel pushbuttons 1 24 Frequency stability is dependent on the time base either an internal or external oscillator The internal crystal oscillator operates at 10 MHz while an external oscillator must operate at 5 or 10 MHz The heart of the Synthesizer a YIG tuned oscillator YTO is phase locked to the time base oscilla
48. put 1 Vpk into 600 ohms nominal Distortion for rates less than 10 kHz and meter readings 0 dB and helow 15 C to 35 C lt 3 at 30 depth lt 4 at 50 depth lt 5 at 75 depth Indicated Meter Accuracy 100 Hz 10 kHz rates 5 of range Accuracy Relative to EXT AM Input Level 100 Hz 10 kHz rates 10 of range Incidental Rates lt 10 kHz 30 Depth lt 0 5 Rad 2 0 6 2 GHz lt 1 5 Rad 6 2 12 4 GHz 1 0 Rad 12 4 18 0 GHz Incidental FM Incidental x fmo FREQUENCY MODULATION CHARACTERISTICS Peak Deviation maximum The smaller of 10 MHz or faoa X 5 20 6 2GHz 10 MHz or x 10 6 2 12 4 GHz 10 MHz or 15 12 4 18 0 GHz Rates 3 dB bandwidth typical 30 100 kHz V ranges 50 Hz to 10 MHz 300 kHz V and 1 3 10 MHz V ranges 1 kHz to 10 MHz Frequency Response relative to 100 kHz rate 2 0 dB 100 Hz 3 MHz 30 and 100 kHz V ranges 2 0 dB 3 kHz 3 MHz 300 kHz V and 1 3 10 MHz V ranges Sensitivity peak deviation per Vpk 30 100 300 kHz V and 1 3 10 MHz V ranges maximum input 1 Vpk into 50 ohms nominal ms Harmonic and Non Harmonic Distortion lt 12 for rates 3 kHz decreasing linearly with frequency to 5 at 20 kHz rate lt 5 for 20 to 100 kHz rates Residual FM i in FM and CW Modes noise and power line related Residual FM in Post Detection EIS dth 12 Hz rms Mode Range CW and 30 ee V thru 3 MHz V
49. r cannot act as a controller 4 Require Service SR1 SRQ Service Request The Synthesizer sets SRQ line true when when unlocked unleveled FM overmo dulated or out of range freq Status Byte Yes SPE Serial Pol Enable The Synthesizer responds to a serial poll by sending a status byte SPD Serial Poll Disable Status Bit PP2 Yes PP Parallel Poll The Synthesizer responds to a parallel poli by sending a status bit on a switch selected data line Yes IFC Interface Clear The synthesizer stops listening ortalking NOTE Complete HP IB capability as defined in IEEE Std 488 is DC1 RL2 SR1 PP2 L4 AH1 SH1 DTQ CQ Model 8672A Operation Receiving Data Messages Cont d amp EXAMPLE 1 prove Level Modulation 4 Frequency Range Vernier AM FM ALC Controller Talk XOX CX CX CX K Synthesizer Listen WHERE C PROGRAM CODE X ARGUMENT OR FREQUENCY DIGIT EXAMPLE 2 90 dBm 4 dB Dummy Argument AM Off Frequency Digits FM Off C iler Talk Norm Internal ontroller Ta T r Sree P P12596365Z0K9L7MONGO1 ALC Code For 10 GHz FM Frequency Execute AM Levei Vernier The Synthesizer ignores spaces commas decimal Table 3 6 Frequency Program Codes and Arguments points carriage returns and line feeds Paragraph 3 37 has more information on program codes All functions may be programmed together as shown or separately as will
50. ranges 10 MHz V range 20 Hz rms Indicated Meter Accuracy at 100 kHz rate 10 of full scale at 15 C to 35 C 15 of full scale at 0 to 55 C Accuracy Relative to External Input Level at 100 kHz rate 7 795 of range at 15 C to 35 10 of range at 0 to 55 incidental AM rates 100 kHz peak deviation lt 1 MHz lt 1096 6 Hz rms 12 The meter reading of output power level when using AM is carrier level only does NOT include power in AM sidebands 13 14 1 0V peak gives maximum depth on each range depth is linearly controlled by varying input level between 0 and 1 Vpk 1 Vpk gives maximum deviation on each range Peak deviation is linearly controlled by varying input level between O and 1 Vpk 15 For certain FM modulating frequencies spurious FM signals non harmonie distortion may occur After demodulation in an external FM discriminator the contribution to distortion of these spurious FM signals is typically less than 0 6 16 17 Residual FM doubles in 6 2 12 4 GHz range triples in 12 4 18 0 GHz range For FM rates other than 100 kHz add FM frequency response specification Model 8672A General Information Tahle 1 1 Specifications 4 of 4 REMOTE PROGRAMMING CHARACTERISTICS Frequency Programmable over full range up to 18 599 997 GHz with same resolution as in man ual mode Output Level Programmable in 1 dB steps 3 to 120 dBm
51. s The programmed output level is more accurate than can be obtained in the local mode This occurs because the output level is set by program ming rather than being set by monitoring the meter r ading The meter reading may be in error due to meter nonlinearity 1 40 OPTIONS 1 41 Electrical Options 1 42 Option 001 The RF Output connector is mounted on the front panel but the internal atten uator is omitted The specified output level is 5 to 10 dBm 1 43 Option 002 The internal 10 MHz crystal ref erence is omitted 1 6 Model 8672 1 44 Option 003 A special fan allows operation from 400 Hz power Mains 1 45 Option 004 The Synthesizer s RF output connector is located on the rear panel Maximum output power is 2 0 dBm Total indicated level accuracy and flatness is degraded by 0 25 dB 1 46 Option 005 The Synthesizer s RF output connector is located on the rear panel and the attenuator is omitted The specified output power is 4 0 to 10 dBm Total indicated level accuracy and flatness is degraded by 0 25 dB 1 47 Mechanical Options 1 48 The following options may have been ordered and received with the Synthesizer If they were not received with the original shipment and are now required they must be ordered from your nearest Hewlett Packard office using the part num ber included in each of the following paragraphs 1 49 Chassis Slide Mount Kit This kit is ex tremely useful
52. tax is as shown in Example 1 For example to pro gram the four functions for 12 596365 GHz 94 dBm AM and FM OFF and ALC internal nor mal use the program codes and arguments in Table 3 10 and write the string as in Example 2 3 13 Operation Model 867 2A Tahle 3 5 Message Reference Table Message and Identification Applicable Command and Title D T6 Talker L4 Listener Synthesizer can change frequency output ata AH1 Acceptor Handshake level modulation and ALC Sends status Trigger DT SH1 Source Handshake byte when addressed to talk B Local RL2 Yes Local Lockout RL2 Device Trigger Synthesizer does not respond to a Device Trigger DCL Device Clear The Synthesizer responds to a DCL or SDC command by setting frequency to 3 GHz Modulation to off RF off and ALC to Internal SDC Selected Device Clear REN Remote Enable Synthesizer goes to remote when the REN line is true and the Synthesizer is first addressed to listen GTL Go to Local Synthesizer goes to local when a GTL command is received The frequency does not change but the front panel controls determine the other functions LLO Local Lockout Synthesizer does not respond to the LLO command Clear Lockout Set Local RL2 REN Remote Disable Synthesizer goes to local when REN goes false Pass Contro Take Control CQ Controller The Synthesize
53. ter Mode selector LEVEL Set the LINE switch B to ON and set the OUTPUT LEVEL VERNIER control and the OUTPUT LEVEL RANGE control tor 10 dBm output E Connect the external leveling crystal detector XTAL or a power meter PWR MTR to sense the RF signal level at the point to be leveled The leveling device may produce either a positive or negative polarity output voltage The Synthesizer automatically produces the proper polarity signal to use with the ALC loop using a crystal detector connect the detectors output to ine EXT ALC INPUT connector e Set the ALC selector to XTAL If using a power meter connect the Recorder Output to the EXT ALC INPUT connector Set the ALC selector e to PWR MTR Operation Model 8672 Table 3 4 Local Operating Instructions 4 of 4 SETTING EXTERNAL ALC WITH A POWER METER OR CRYSTAL DETECTOR Cont d NOTE If the HP 436A Power Meter is to be used set the Synthe sizer s output level to 1 dBm with the ALC selector to INT Depress the RANGE HOLD pushbutton on the 436A If the RANGE HOLD pushbutton is not depressed the power meter may slowly oscillate due to autoranging 5 Set the OUTPUT LEVEL RANGE control o and the VERNIER control for the desired power level 6 Adjust the CAL control e to obtain z stable leveled power output 10 dB below the output level indicated by the RANGE dBm display the indication on the Meter o The 10 dB offset
54. this manual s pririt date and part number both of which appear _ the title page Complimentary copies of the supplement are available from Hewlett Packard 1 1 General Information Model 8672A Table 1 1 Specifications 1 of 4 SPECIFICATIONS FREQUENCY CHARACTERISTICS Range 2 0 to 18 0 GHz overrange to 18 599 997 GHz Resolution 1 kHz 2 0 6 199 999 GHz _ 2 kHz 6 2 12 399 998 GHz 3 kHz 12 400 002 18 0 GHz Time Base Internal 10 MHz Aging Rate is 5 x 10 day after 30 day warmup 2 External 5 or 10 MHz 0 1 to 1 Vrms nominal into 50 ohms Reference Outputs 10 MHz and 100 MHz 0 2 Vrms nominal into 50 ohms Frequency Accuracy same as time base Switching Time CW and AM modes 15 ms to be within 1 kHz for frequencies from 2 6 2 GHz with in 2 kHz from 6 2 to 12 4 GHz and within 3 kHz from 12 4 18 GHz lt 15 ms to be within 3 dB of final amplitude level for any frequency change on the same band SPECTRAL PURITY CHARACTERISTICS Harmonics up to 18 GHz lt 25 dBe Sub harmonics and Multiplies up to 18 GHz 25 dBe Spurious CW and AM modes Non harmonically related lt 70 dBc 2 0 6 2 GHz lt 64 dBc 6 2 12 4 GHz lt 60 dBc 12 4 18 0 GHz Power Line Related and Spurious Due to fan rota tion within 5 Hz below line frequency and multiples Except Option 003 Instruments 400 Hz operation Carrier Fc Power Line R
55. tor 1 25 Output Level 1 26 The output of the Synthesizer is excep tionally flat due to the action of the internal auto Power 100 120 220 or 240V 5 10 48 66 Hz 300 VA maximum Net Weight 27 2 kg 60 Ib Dimensions 600 mmD x 425 mmW x 133 mmH 23 5 8 x 16 3 4 x 5 1 4 matic leveling control ALC loop The accuracy of the total indicated output level the sum of the front panel meter reading and the attenuator range is increased 1 27 The OUTPUT LEVEL VERNIER controls the output level as indicated by the front panel meter 3 to 10dB The OUTPUT LEVEL RANGE switch sets the attenuation of the output level in twelve 10 dB steps 0 to 110 dBm The 10 dBm range overrange is also controlled by the OUTPUT LEVEL RANGE switch 1 28 Modulation Modes 1 29 Both amplitude and frequency modulation capabilities are available in the instrument using either front panel switches or remote program ming External drive signals are used for both AM and FM operation AM depth and FM deviation are linear with the applied external voltage Full scale modulation is attained with 1 0 V peak 1 30 Two ranges of AM depth are selectable either from the front panel or via remote pro gramming The front panel meter can be used to set the AM depths of up to 75 between 2000 MHz and 6200 MHz up to 60 between 6200 MHz and 12 400 MHz and 50 between 12 400 MHz and 18 000 MHz Amplitude mod ulation can
56. tput when in the OFF position This condition is displayed in the RF annunciator and causes the NOT PHASE LOCKED annunciator in the STATUS Block to illuminate When the ON position is selected the Synthesizer returns to normal operation The functions of the RF switch are programmable METER MODE switch selects either LEVEL AM or FM to be displayed on the meter Operation 3 4 Model 8672A Table 3 2 Rear Panel Features HP IB CONNECTOR connects the Synthesizer to the Hewlett Packard Interface Bus for remote operation When in remote operation the STATUS Block see Figure 3 1 REMOTE annunciator illuminates 100 MHz OUT A3J7 0 dBm nominal into 50 ohms can be used as an external timebase and for trouble shooting RF OUT A3J6 only for Options 004 and 005 50 ohm type N output connector see Table 1 1 for Option information 10 MHz GUT A3J8 0 dBm nominal into 50 ohms can be used as an external timebase and for trouble shooting FREQ STANDARD Output A3J9 10 000 MHz into 50 ohms at 7 dBm nominal from the internal frequency standard except when INT EXT switch Q isin the EXT position FREQ STANDARD INT EXT switch normally left in the INT position Removes power from internal frequency standard when in the EXT position 9 Jumper A3W3 normally connects the Internal Fre quency Standard Output A3J9 to the External Fre quency Standard Input A3J10
57. wer level uncalibrated with RF power on 4 FM overmodulated with RF power on The Synthesizer sends this message by setting the service request line SRQ true It will request service in local or remote whether or not it is addressed 3 58 Sending the Status Byte Message 3 59 The Synthesizer sends the status byte when addressed to talk This byte is the Synthesizer s re sponse to a serial poll The Synthesizer responds to a serial poll when the controller sends a serial poll enable command SPE then addresses the Synthe sizer to talk The SPE command enables the Synthesizer to clear the service request SRQ when addressed to talk Also when the Synthesizer re ceives its talk address bit 7 of the status byte is latched The Controller can then determine the status of the Synthesizer by converting the status byte to a decimal value Status byte coding is as follows E NOT LEV PHASE UNCAL LOCKED Operation Sending the Status Byte Message Cont d 3 60 The RSV Request Service bit is true when ever any of the four conditions that cause a re quest for service exists even during the first 50 ms after a programming change Once the Synthesizer is addressed to talk the RSV line is latched even though the Synthesizer s need for service may have changed 3 61 The status byte is useful for determining when a given programming change has been exe cuted For example if the Synthesizer is addressed to talk im

HP 8672A User's Manual

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