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HP 8660D User's Manual

1. 3 Connect the RF output to the RF INPUT of the spectrum analyzer Enter 10 MHz CF and 10 MHz SWEEP WIDTH and set the SWEEP MODE to AUTO Set the SWEEP RATE to MED and adjust the spectrum analyzer for a clear display Enter 5 MHz STEP and step the frequency across the RF range The readout should increase in 5 MHz steps Sweep should continue to be 5 MHz on each side of the CF rr Sweep Mode Checks with 86602A 866028 or 86603A RF Sections NOTE When the RANGE light comes on during the HP 86602 HP 86603 checks it is because the frequency has dropped below the lower frequency limit of 1 MHz 1 Set CF to 5 MHz Set SWEEP WIDTH to 10 MHz Set SWEEP MODE to AUTO and SWEEP RATE to MED Display should read 5 000000 MHz and the RANGE light will flash every second RF Section meter also will dip and SWEEP light will remain on 2 Set SWEEP WIDTH to 2 MHz Set CF to 1 MHz The display should read 1 000000 MHz with SWEEP light on The RANGE light will flash every second 3 Set CF to 5 MHz on the keyboard Set SWEEP WIDTH to 10 MHz Set SWEEP RATE to MED Display should read 5 000000 MHz and the RANGE light will flash every second Tionga 3 9 Operation Model 8660D Manual Sweep Check 1 Enter 50 MHz CF and 10 MHz SWEEP WIDTH Place the SWEEP MODE in the MANUA position Rotate the TUNING control knob through its range Note that CF is tuneable from 4 to 55 MHz Single Sweep Check 1 Enter 50 MHz CF and 20
2. This product is a Safety Class I instrument that is one provided with a protective earth terminal Before operating or servicing the Signal Generator service personnel should familiarize themselves with the safety markings on the Signal Generator and the safety instructions in the manual Safety information regarding installation operation performance testing or adjusting of the HP 8660D is found throughout this manual Refer to the Safety Considerations pages found at the beginning of this manual for a summary of that information 1 5 HEWLETT PACKARD INTERFACE BUS HP IB ENABLES REMOTE CONTROL The Signal Generator has a Hewlett Packard Interface Bus HP IB interface and can be used with an HP IB compatible controller for test system applications The Signal Generator is fully programmable via the Hewlett Packard Interface Bus Operation of the plug in sections may also be remotely programmed through the mainframe circuits Both BCD Binary Coded Decimal and HP IB are available for use in programming the Signal Generator An extended set of programming codes is used in the HP 8660D although the codes found with the HP 8660A C manual are completely compatible with the HP 8660D HP IB is Hewlett Packard s implementation of IEEE Standard 488 and the identical ANSI Standard MC1 1 Refer to Section IHI for more complete details about programming the HP 8660D Selecting the HP IB Address The Signal Generator s HP IB address is set
3. Manere HP 8660D SYNTHESIZED SIGNAL GENERATOR Including Options 001 002 003 and 005 Operation and Calibration Manual SERIAL NUMBERS This manual applies directly to instruments with serial numbers prefixed 3006A and all MAJOR changes that apply to your instrument This material may be reproduced by or for the U S Government pursuant to the Copyright License un der the clause at DFARS 52 227 7013 APR 1988 Copyright HEWLETT PACKARD COMPANY 1987 P O BOX 2500 SPOKANE WASHINGTON U S A 99220 2500 Valuetronics International Inc 1 800 552 8258 MASTER COPY Operation and Calibration Manual HP Part 08660 90103 Other Documents Availabie Service Manual Volume 2 3 HP Part 08660 90104 Microfiche Operation and Calibration Manua HP Part 08660 90105 Microfiche Service Manual HP Part 08660 90106 PACKARD Printed in U S A March 1993 iz HEWLETT x j e cd p e E z e se the back of this manual CERTIFICATION Hewlett Packard Company certifies that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WAR
4. Adjustiient 3 Reference Section e sit 500 sn EA A A PE A AS ER 5 11 Adjustment 4 10 MHz Bandwidth Filter After Repair 5 16 Adjustment 5 10 MHz Bandpass Filter lt lt 0 AE 5 18 Adjustment 6 High Frequency Section 2 uses de e eR A 5 19 Adjustment 7 N1 Phase Lock Loop lt lt 2 o o ee ae eo ae 5 25 Adjustment 8 N2 Phase Lock Loop sa ic a AAA Re bi 5 27 Adjustment 9 N3 Phase Lock Loops 2 e e e DA A Ee e e 5 29 Adjtstment 10 Summing Loop 2 BL 0 chiva oe i eet ae SS Ss Ad er 5 31 Adjustment 11 Summing Loop 1 SED dorcsariara a aaa A sa te er Ea a ee 5 3 Adjustment 12 DCU Sweep Output E RARA a ae GL 5 3 Model 8660D General Information Section 1 GENERAL INFORMATION 1 1 DESCRIPTION The HP 8660D Synthesized Signal Generator mainframe pictured in Figure 1 1 requires two plug in sections to provide a useable RF output The plug ins required are an RF Section and a Modulation or Auxiliary Section These plug in sections are inserted into the front of the HP 8660D all operating controls are on the front panels of the plug in sections or on the mainframe panel An internal plug in unit the Frequency Extension Module HP 11661A is required when any RF Section other than the HP Model 86601 is in use The HP 8660D is programmable using either HP IB Hewlett Packard Interface Bus or BCD Bin
5. 45 MHz A18R40 7 22 550 MHz 20 kHz 6 45 MHz A18R44 6 23 550 MHz 20 kHz 5 45 MHz A18R51 5 24 550 MHz 20 kHz 4 45 MHz A18R55 4 25 550 MHz 20 kHz 3 45 MHz lo aten62 3 26 550 MHz 20 kHz 2 45 MHz A18R67 2 27 550 MHz 20 kHz 1 45 MHz A18R74 1 28 550 MHz 20 kHz Adjustment 11 5 35 Adjustments Model 8660D Adjustment 12 DCU SWEEP OUTPUT e Service Sheet 25 Description The HP 8660D sweep output is used to drive the horizontal sweep of an oscilloscope while the RF output is used to determine the characteristics of a device being tested This procedure properly adjusts the sweep ramp output Test Equipment Digital Voltmeter 20 A RU ee A AA HP 3478A Procedure 1 Remove the bottom cover from the HP 8660D 2 Connect the DVM to the 0 8V output on the front panel Set the DVM to measure DC volts 3 Enter 1 0005 MHz center frequency and 1 kHz sweep width 4 Set Sweep Mode to Manual Using the tuning knob set frequencies shown in Table 5 15 and make the indicated adjustments All adjustments must be 1 mVdc en Table 5 15 Adjustments step Frequency Adjust 1 000799 MHz Record DVM output reading typically 6 392V 1 000800 MHz R29 for an output 8 mV greater than above Reading is typically 6 4V 1 000999 MHz R11 for an output of 7 992V _ 1 000000 MHz R28 for an output of 0 000V Repeat steps 1 through 4 4 001000 MHz R30 for an output of 8 000V Table 5 16 Frequency V
6. HP part number 2110 0303 This is a Safety Class I product that is provided with a protective earth terminal An uninterruptible safety earth ground must be provided from the Mains power source to the product input wiring terminals power cord or supplied power cord set Whenever it is likely that the protection has been impaired the instrument must be made inoperative and be secured against any unintended operation BEFORE CONNECTING THIS INSTRUMENT the protective earth terminals 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 provided 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 If this instrument is to be energized via an external autotransformer make sure the autotransformer s common terminal is connected to the earthed pole of the power source CAUTION For protection against fire hazard the line fuse should only be a 250V normal blow fuse with the correct current rating power cables available Model 8660D Installation red Operating voltage is shown in module window Selection of Operating Voltage and Fuse Replacement 1 Open cover door pull the FUSE PULL lever and rotate to left Remove the fuse 2 Remove the Line Voltage Selection Card Position the card so the line voltage appears at to
7. Locked Loops CF MHz Vdc TP17 CF ety Vde TP10 Ha Vdc TP3 z 1 1 e Ha AAA 11 2 2 me 22 2 INP 22 3 3 AA 33 3 RICA 33 4 4 o 44 4 A 44 5 5 55 5 e 55 6 6 juss Sees 66 6 Se reise ceo 66 7 7 EEN 77 7 i AA 77 8 8 AN 88 8 A h 88 9 9 ETE ee 99 9 eee 99 SL2 Loop SLi Loop HF Loop Vd Vde TPB CF MHz Vde TP140 CF MHz 1 500 mVdc 2 400 mVde 4 7 Performance Tests Model 8660D Table 4 1 Performance Test Record 2 of 2 Hewlett Packard Model 8660D Tests Performed by Synthesized Signal Generator Serial No A Date Crystal Oscillator Aging Rate Standard lt 3x107 Actual Output Reference Level Minimum Maximum Actual 0 75 Vrms 1 5 Vrms Phase Locked Loops Ni Loop N2 Loop N3 Loop ia CF MHz Vde TP170 CF kHz Vde TP10 assed ES Vdc TP3 SL2 Loop HF Loop 1 500 mVdc 2 400 mVdc 4 8 Model 8660D Adjustments Section 5 ADJUSTMENTS 5 1 INTRODUCTION This section describes adjustments and checks required to return the HP 8660D to peak operating capability when periodic adjustments are required or when repairs have been made Included in this section are test setups and procedures Except for the Abbreviated Phase Locked Loops and Power Supply adjustment procedures which should be performed before repairs are made to any part of the instrument the adjustment procedures are arranged in the same sequence as the service sheets to which t
8. TP3 and TPS is difficult because they are under the ASAI and A3A2 assemblies TP3 can be reached by using a piece of solid wire to probe down into the test point TP8 is connected to XA12 1 pin 4 which ts accessible 3 Connect the oscilloscope probe to TP 17 the first test point specified in Table 4 1 N1 Loop Set the HP 8660D CF to the corresponding frequency values and record the measured DC offsets If the DC offset exceeds 0 0V 500mV perform Adjustment 1 abbreviated phase locked loops adjustment procedure Repeat this procedure for all 6 loops in Table 4 1 Note that the HF Loop DC offset should not exceed 0 0V 100 mV after thermal stability is reached Typically the HP 8660D will be thermally stable after six hours of warm up with the covers on NOTE The trace displayed on the oscilloscope should be a de level It is normal for some ac components to appear on the trace However if the peak to peak amplitude of the ac component is greater than 500 mV the loop is probably not locked Also if the trace cannot be adjusted to O volts the loop is probably not locked In either case the full adjustment procedure should be performed Model 8660D Performance Tests Table 4 1 Performance Test Record 1 of 2 Hewlett Packard Model 8660D Tests Performed by Synthesized Signal Generator Serial No eee Date Crystal Oscillator Aging Rate Standard lt 3x107 Output Reference Level Minimum Maximum 0 75 Vrms 1 5 Vrms Phase
9. This error occurs when an unrecognized command or ASCII character is received over the GPIB while in the OLD programming format This error occurs when an unrecognized command or ASCII character is received over the GPIB while in the NEW programming format 09 This error occurs only in the HP 18 NEW programming format when an output level which is out of the respective plug in s output range is programmed over the GPIB This error condition aborts the command The Output Level is programmed with a maximum of three significant digits This error occurs only in the HP IB NEW programming format when a modulation level which is out of range for the specified modulation type is programmed over the GPIB For example AM gt 99 PC PM gt 99 DG FM gt 990 Kz or FM lt 0 1 kZ NOTE _ Modulation is programmed with a maximum of three significant digits 3 11 Operation Mode 8660D 3 9 SIGNAL GENERATOR FUNCTION TO NEW HP IB CODES Table 3 2 organizes the HP 8660D operating functions to their corresponding HP IB NEW programming codes Table 3 2 HP IB NEW Code Summary IN eee EN ee E E MODULATION SOURCE FREQUENCY internal 1 kHz Mi Center Frequency FR Internal 400 Hz M2 Frequency Step Up UP internal dc Coupled M4 Frequency Step Down DN External ac Coupled M8 increment Set FRUS External ac Coupled Unleveled M9 AMPLITUDE SWEEP Output Level AP Sweep Width FS MODULAT
10. Values N1 Loop N2 Loop N3 Loop CF MHz Vdc TP170 O CEK Vde TP100 MET Vdc TP3 0 coh he Fe Yee y 0 we a J 0 Avg Sum 10 Sum 10 Avg Sum 9 E Adjust Value 1 With 866014 only 5 8 Adjustment 1 A11R39 8 A11R54 7 A11R60 6 A11R67 S A11R73 4 A11R77 3 A11R83 2 Ai1R90 1 SL1 Loop A18R35 8 A18R40 7 A18R44 6 A18R41 5 A18R55 4 A18R62 3 A18R67 2 Ai8R74 1 HF Loop Adj Point A4A6RE0 1 A4A6R56 2 A4AGRS53 3 A4AGRS8 4 A4A6R44 5 A4A5R40 6 A4A6R35 7 A4A6R28 8 A4ABR22 9 A4AGR22 9 Model 8660D Adjustments Adjustment 2 POWER SUPPLY e Service Sheet 27 Description The power supplies in the HP 8660D provide regulated outputs of 20V 5 25V 10V and 40V Unregulated supplies provide 30V 21V 4V and 21V The following procedure should be used to adjust the regulated output of each power supply STEP 3 VOLTAGE TP s DIGITAL VOLTMETER AC VOLTMETER STEP 2 VOLTAGE TP s Figure 5 2 Power Supply Test Setup Test Equipment Digital VOLTEAR AAA ne cag HP 3478A E IN os CRAM A AINE ESSIEN GENE EROS HP 3466A Procedure 1 Set up test equipment as shown in Figure 5 2 2 Remove the top and bottom covers of the HP 8660D 3 Use the digital voltmeter and the ac microvoltmeter to check the voltages and ripple at A20 test poi
11. a Press the kHz key The display should read 1 000 kHz Units annunciator flashing b Press the MHz key The display should read 1 000000 MHz Units annunciator flashing C Press the GHz key The display should read 1 000000000 GHz Units annunciator flashing d Press the SHIFT key and then the lt key The display should read 1 000000 MHz Step t y Register and RANGE Annunciator Check Using the HP 86601 RF Section 1 Enter 109 MHz and press CF on the keyboard The display should read 109 000000 MHz 2 Enter 111111 Hz and press STEP f key The display should read 109 000000 MHz 3 Press the SHIFT key and then the STEP key The display should read 111111 Hz momentarily then return to 109 000000 MHz Model 8660D 10 12 13 Operation Press the STEP f key until the readout shows 109 999999 MHz Note that the readout increments in 111111 Hz steps Press the STEP f key one more time The RANGE annunciator should flash once Press the MANUAL MODE key four times to put manual tuning in STEP mode and turn the TUNING knob counterclockwise The value in the display should decrement in 111111 Hz steps Enter 10 kHz and press the CF key The display should read 10 000 kHz Enter 1 Hz and then press the STEP key The display should read 10 000 kHz Press the STEP The display should read 9 999 kHz With the Model 86601A RF Section the maci n lower frequency limit is 10 kH
12. after the instrument has been connected to the ac line for 72 hours dB da Beja fa OSCILLOSCOPE FREQUENCY STANDARD Ai oo TEESE jo Cece O so A VERTICAL TRIGGER INPUT INPUT 588 FEEDTHRU TERMINATION Figure 4 1 Crystal Oscillator Aging Rate Test Setup Equipment Prequeney Standard o A O a HP 5065A Oscilloscope ooooo o AI A SERA a Ge HP 54200A BOC Fecdthru Termination oi LARA EIA EIN HP 10100C Procedure 1 Set the rear panel REFERENCE switch to INT 2 Connect the equipment as shown in Figure 4 1 3 Adjust the oscilloscope controls for a stable display of the 10 MHz output 4 Measure the time required for a phase change of 360 Record the time T in seconds T 8 4 2 Mode 8660D Performance Tests 5 Wait for a period of time from 3 to 24 hours and re measure the phase change time T Record the period of time between measurements Ty in hours 6 Calculate the aging rate from the following equation Aging Rate E ee aa 2 f T T XT where l cycle the phase change reference for the time measurement in this case 360 f Synthesizer s reference output frequency 10 MHz F specified time for aging rate 24 hours Ti initial time measurement s for a 360 1 cycle change Ta final time measurement s for a 360 1 cycle change Ts time between measurement s hours for example if T 351 seconds a T 349 seconds T3 3 h
13. be charged even if the instrument has been dis connected from its source of supply For continued protection against fire hazard replace the line fuse s only with 250V fusets of the same current rating and type for exam ple normal blow time delay etc Do not use repaired fuses or short circuited fuseholders HA A ee E Model 8660D Volume 1 Contents l VOLUME 1 CONTENTS Section 1 General Information Description lea ante is RO Ses Se A Se ee A e ee a eee Ree 1 1 Introduction to the Operation and Calibration Manual ee ee ee ee Poa a ee ae 1 1 Volume I Operation and Calibration Manual o oo o o 1 1 Where to Find Instrument Specifications cies e a A ee ee ee ow 1 1 Where to Find Safety Considerations ee ewe ee ee ee eens 1 2 Hewlett Packard Interface Bus HP IB Enables Remote Control 1 2 Selecting the HP IB Address a sa a e a AA A ERA A A 1 2 Accessories Supplied with the HP 8660D 6 03 4 S05 a6 6 wee a a a Re we 1 2 Equipment Required but Not Supplied oo 4 2 4 2 2 2 1 2 Options Available with the Instrunent 3 aries EA AA ARS A A ANA 1 3 Electrical Options 56 5 4 as acs a tae NA to sate as Ce ee Tale ata gD wah Raat er eaten a a ae ER Mechanical Options 1 644 06 4 99 Se ee ei es ES RN 1 3 Manual Options desa a Gene Ak a te RIO PAD ira ve Re AS eR AA ee A 1 3 General Operating Principle
14. frequency is controlled by changing the 10 kHz 1 kHz and 100 Hz digits of the front panel display The following procedure adjusts the pretuning circuitry of the loop gt DIGITAL VOLTMETER HP 866800 es wre PE S UTPU FREQUENCY COUNTER o oc 0 EXT TIMEBASC INPUT Figure 5 19 N2 Loop Test Setup Test Equipment Digital Voltmeter consi A tle Wad atic edema aaa ea tee dose HP 34784 Frequency Counter vaa Tas cia Rs waged HP 5385A Procedure 1 Set up test equipment as shown in Figure 5 19 2 Set the center frequency to 0 MHz and ground A2TP12 on the A2 Motherboard with one of the jumper plugs provided 3 Connect the digital voltmeter to A2TP9 and adjust A13R37 or A13R39 to 30V 0 1 Vdc Disconnect the digital voltmeter 4 Connect the frequency counter to the N2 oscillator output at XA13 14 Adjust A13C19 for a counter reading as close as possible to 29 79 MHz 0 02 MHz 5 Set the HP 8660D center frequency to 95 5 kHz Adjust A13R37 for a counter reading of 20 24 MHz 0 020 MHz Hint Set the Step Freq increment to 90 kHz 6 Set the HP 8660D center frequency to 5 5 kHz Adjust AI3R39 for a frequency counter reading of 29 24 MHz 0 020 MHz 7 The adjustments in steps 5 and 6 are interactive Repeat these steps until both counter readings are within tolerance Adjustment 8 5 27 Adjustments 5 28 8 Remove the ground from A2TP12 9 Connect the voltmeter to A2 Motherboard TP10 10 Se
15. gt i l y gn mn DS at HP 10100C a i Sweep Generator Test Oscillator Frequency Range 10 Hz to 20 MHz Output Level 35 to 10 dBm RF Voltmeter Range 0 1 to 2V Frequency Range 1 to 10 MHz SON Feedthru Termination Use A Adjustments P Performance Tests S Service 1 6 Model 8660D General Information Table 1 2 Recommended Test Equipment and Accessories List 2 of 2 Model Description or Part Number Service Kit Consisting of HP 11672A Adapter BNC female to OSM male HP 1250 1200 Adapter BNC female Sealectro female HP 1250 1236 Adapter BNC female Sealectro female HP 1250 1237 Adapter Right angle OSM male female HP 1250 1249 Sealectro jack printed circuit mount HP 1250 1255 Adapter Sealectro Tee HP 1250 1391 Tool Adjustment HP 8330 0024 Cabie Extender 66 pin gray HP 41672 60001 Cable Extender 42 pin gray HP 11672 60002 Cable Assy Sealectro male female 24 long gray HP 11672 60005 Cable Assy Sealectro male femaie right angle connectors 24 long red HP 11672 60004 Cable Assy Sealectro right angle female BNC male 24 long gray HP 11672 60003 Cable Assy Sealectro male female 24 long gray with blue stripe HP 11672 60006 Cable Assy White HP 11672 60008 Use A Adjustments P Performance Tests S Service 1 7 Model 8660D Installation Sur Section 2 INSTALLATION 2 1 INTRODUCTION TO THIS SECTI
16. in 100 kHz steps The output frequency is controlled by changing the 1 MHz and 100 kHz digits of the front panel display The following procedure adjusts the pretuning circuitry of the loop A21P18 DIGITAL VOLTMETER ig MHz OUTPUT E sjesesale oloocoa O Fo cocoa lo also o 0 Neree Test Equipment Digital Voltmeter sesssrsrssrrossesevearererseresossusvescansearesneesesares HP 3478A Frequency Counter se cr AR A AR AAA HP 5385A Procedure 1 Set up test equipment as shown in Figure 5 18 2 Enter 0 MHz center frequency and ground A2 Motherboard test point A2T P16 with one of the jumper plugs provided Connect the digital voltmeter to A2TP18 3 Adjust A17R31 or A17R28 for a voltmeter reading of 30 Vde 0 1 Vde and disconnect the digital voltmeter 4 Connect the frequency counter to the N1 oscillator output on the A2 mother board and adjust A17C17 for a counter reading of 29 70 MHz 0 02 MHz 5 Set the HP 8660D center frequency to 9 5 MHz Adjust A17R31 for a counter reading of 20 2 MHz 0 02 MHz Hint Set the Step Freq increment to 9 MHz 6 Set the HP 8660D center frequency to 0 5 MHz Adjust A17R28 for a counter reading of 29 2 MHz 0 02 MHz 7 The adjustments in steps 5 and 6 are interactive Repeat these adjustments until both counter readings are within tolerance Adjustment 7 5 25 Adjustments 5 26 Model 8660D 8 Remove the ground jumper from A2TP16 9 Disconnect the 400
17. t0 422 ohms 422 ohms A4A7R23 Sampling To permit adjustment of A4A7R22 See paragraph 5 30 7 5k to 11k Phase Detector step 2b ABR18 N3 Oscillator To aid in balancing Summing loop for Varactor tuning 19 6kto25k A8RZ5 N3 Oscillator E l 4k to 6k A13R30 N2 VCO To center range of associated potentiometer 62k to 8 25k Lanne a N2 VCO To center range of associated potentiometer 42 1k to 17 4k A13R60 N2 VCO To compensate tor variations in the Varactor diode by 68k to 120k reducing phase error output of the N2 assembly Selected for an output at A2TP10 phase monitor of 0 00 0 35 Vde A13R81 N2 VCO To produce the most symmetrical square wave at 23 7 to 237 ohms A14aTP1 See Service Sheet 9A and 10 A16R2 N1 Phase To compensate for variations in UTA switching 825 ohms to 1 21k Detector characteristics A17R29 N1 VCO To center range of associated potentiometer center range of associated To center range of associated potentiometer EN 1k EN 17 4k A17R32 N1 VCO To center range of associated potentiometer 5 11k to 7 5k A19R55 SLI Oscillator To set the SL1 Oscillator output between 3 amp 5 dBm 511 ohms to 1 47k Table 5 3 Range of Values 4dB 5a 6d 7a 8dB R37 R38 R41 R42 315 178 147 133 R39 R40 12 1 17 8 23 7 28 7 34 8 46 4 Model 8660D Adjustments Adjustment 1 PHASE LOCKED LOOPS ABBREVIATED Description This procedure specifies the adjustments for the
18. until Manual Mode is set to COARSE and rotate the TUNING control clockwise until the readout indicates 109 000000 MHz Note that the readout steps in 1 MHz increments 3 Repeatedly press the manual MODE key until Manual Mode is set to MED and rotate the TUNINC control clockwise until the readout indicates 109 999000 MHz Note that the readout steps i 1 kHz increments 3 8 Model 8660D Operation 4 Repeatedly press the manual MODE key until Manual Mode is set to FINE then rotate the y TUNING control clockwise until the readout indicates 109 999999 MHz Note that the readout steps in 1 Hz increments NOTE The RANGE light flashes on if the RF Section upper frequency limit 109 999999 MHz is passed The system rejects overrange frequencies and the CF register retains the last valid entry Sweep Mode Checks with 86601A RF Section NOTE Proper operation of the instrument in the sweep mode is best verified with a spectrum analyzer However operation of the sweep function can be verified by front panel indications in steps 1 and 2 Also when the RANGE light comes on during these checks it is because the frequency has dropped below the lower frequency limit of 10 kHz 1 Set CF to 5 kHz Enter 10 kHz and press SWEEP WIDTH Place SWEEP MODE in the AUTO position and the SWEEP RATE in MED position The SWEEP and RANGE lights should be on 2 Set CF to 10 kHz The SWEEP light should remain lit RANGE light should flash every second
19. 0 0 D 0000 0 10 00 00 00 00 Temporary Command 00 10 00 00 00 Address D 1111 15 Dz 0001 1 00 10 00 00 00 00 00 00 00 00 Last Input Last input Last input Last Input Last input 00 10 00 00 Transfer Command 3 22 Model 8660D Operation Table 3 5 AM FM Function Register Coding Digit 2 D Digit 1 D 0 High 1 Low O High t Low 1100 12 EXT AC Unieveled 1001 9 HP 86633 only 0100 4 EXT DC 0100 4 0010 2 INT 400 Hz 0010 2 0001 1 INT 1 kHz 0001 1 0000 0 Table 3 6 Programming Connections to A23J3 Remote Inputs Rear Panel Pin 1 To A23J3 Pin 18 Pin 3 Pin 2 Error Pin 5 Pin 5 LOL RMT Pin 9 Pin 11 Command Pin 13 Pin 15 Digit 1 8 Pin 14 Pin16 Digit 1 4 l Pin 15 Pin 17 Digit 1 2 Pin 16 Pin 18 Digit 1 1 Pin 17 Pin Fiag Busy Pin 24 Pin J Reset Pin 28 Pin S Digit 2 8 Pin 29 Pin T Digit 2 4 Pin 30 Pin U Digit 2 2 Pin 31 Pin v Digit 2 1 Pin 36 To Ground A23J3 pins not listed are also wired to A3XA5 See the Rear Interface Assembly schematic diagram for wiring information 3 23 Model 8660D Performance Tests Section 4 PERFORMANCE TESTS 4 1 INTRODUCTION Most of the procedures in this section apply to verifying the instrument s electrical performance using the specifications of table 1 1 as the performance standards Performance Test 3 Phase Locked Loops Test verifies that the error volta
20. 0 kHz 2 2 lt Vp p lt 5 0 100 kHz 2 2 lt Vp p lt 5 0 100 kHz 2 2 lt Vp p lt 5 0 OSCILLOSCOPE Figure 5 8 Oscilloscope Level Checks Test Setup Adjustment 3 15 Adjustments Model 8660D Adjustment 4 10 MHZ BANDPASS FILTER ADJUSTMENT AFTER REPAIR NOTE It is necessary to remove this assembly from the mainframe in order to perform the adjustments Therefore this adjustment is to be performed ONLY if the Reference Assembly is repaired Description The 700 Hz sidebands are set at least 20 dB down from the 10 MHz reference oscillator signal Test Equipment Synthesizer A SS A A OS HP 8660 or 33254 REVOCA dl ES HP 3400A 50 ohm Feedthrough Terminalio seccatid AA HP 10100C 22 FEEDTHRU TERMINATION Figure 5 9 A22A1 Adjustment Test Setup After Repair Procedure 1 Connect equipment as shown in Figure 5 9 The 5 25 Vdc source must be connected to the junction of the inductor and feedthrough capacitor The ground return must be connected to the chassis and the feedthrough capacitor 2 Release and rotate the A4 assembly up and out of the chassis Locate A21 output cable J1 white and disconnect from reference oscillator A21 Connect external synthesizer to cable Set Reference Synthesizer to 10 000000 MHz 13 dBm 5 16 Adjustment 4 Model 8660D 0 3 0 0t A 0 Adjustments Set the unit under test reference switch to INTERNAL Adjust A22A1C3 for maximum RF Voltmeter reading use a non metallic adjus
21. 4 and 5 are interactive Repeat these steps until both counter readings are within tolerance 8 Remove the ground from the A2 TP8 12 13 14 Set the HP 8660D center frequency to 94 5 kHz Connect the voltmeter to A2 Motherboard TF and adjust A11R19 for a DVM reading of OV 5 mVdc Connect the oscilloscope to A2 Motherboard TP7 Adjust A12R37 for a square wave with 50 50 symmetry Remove the oscilloscope Set the HP 8860D center frequency to 4 5 kHz Adjust A11R15 for a DVM reading o iy OV 100 mVdc at A2TP8 NOTE The voltage readings will drift immediately after a frequency change Wait until the reading stabilizes before making the adjustment Set the HP 8660D center frequency to 94 5 kHz Adjust A11R19 for a DVM reading of OV 100 mVdc The adjustments in steps 11 and 12 are interactive Repeat these steps until both DVM readings are within tolerance Set the HP 8660D center frequency to the values given in Table 5 13 At each frequency setting adjust the control listed in the table for a DVM reading of OV 100 mVdc The frequency at TP6 SL2 OSC should be as shown in the table Adjustment 10 Model 8660D Adjustments Table 5 13 SL2 Oscillator Output Frequency Adjustments Center Frequency at Counter Readout 84 5 kHz A11R39 8 21 55 MHz 20 kHz 74 5 kHz A11R54 7 22 55 MHz 20 kHz 64 5 kHz AT1R6O 6 23 55 MHz 20 kHz 54 5 kHz A11R67 5 24 55 MHz 20 kHz 44 5 kHz
22. A11R73 4 25 55 MHz 20 kHz 34 5 kHz A11R77 3 26 55 MHz 20 kHz 24 5 kHz O ATIRB3 2 27 55 MHz 20 kHz 14 5 kHz A11R90 1 28 55 MHz 20 kHz Adjustment 10 5 33 Adjustments Model 8660D Adjustment 11 SUMMING LOOP 1 SL1 Service Sheet 15 16 and 17 Description SLI is a phase lock loop that provides a digitally controlled RF output to the RF Section plug in This output which is from 20 000001 to 30 000000 MHz in 1 Hz steps is controlled by changing the Ni and SL2 phase locked loops The following procedure adjusts the pretuning circuitry of the loop OSCILLOSCOPE VERT IN RF TEST POINTS DIGITAL VOLTMETER FREQUENCY COUNTER a j EXT TIMEBASE INPUT Test Equipment Digital Voltmeter dor TS A A EEA HP 3478A Frequency DOM A A R E D a HP 5385A Oscilloscope 10 1 divider probes o oooooooocronommormms s Ei HP 542004 Procedure 1 Set up test equipment as shown in Figure 5 22 2 Set the HP 8660D center frequency to 0 Hz Connect a plug in jumper on the A2 Motherboard between TP14 and GND 3 Connect the voltmeter to A2TP21 Adjust A19R9 for 30V 0 1 Vdc Remove the voltmeter cable from TP21 4 Connect the frequency counter to the A2 Motherboard test point labeled SL1 OSC Adjust A19C18 for a counter reading of 30 MHz 0 02 MHz 5 Set the center frequency to 9 45 MHz Adjust A19R9 for a counter reading of 20 55 MH 0 02 MHz 5 34 Adjustment 11 M
23. D display of CW frequency is active in either local or remote mode unless the DISPLAY BLANK command has been programmed over the remote interface bus HP IB or BCD Synthesized Search The Tuning dial increments the synthesized output frequency 60 steps per revolution with the HP 86601A the COARSE and STEP tuning are desensitized to 30 steps revolution Step sizes are 1 Hz 1 kHz 1 MHz or any step size entered through the keyboard Digital Sweep Type Symmetrical about CW center frequency Sweep width is divided into 100 r synthesized steps for fastest sweep speed or 1000 steps for slower speeds or Manual Sweep Sweep Width Continuously adjustable over range of RF section installed Smallest step size is equal to frequency resoiution of mainframe Sweep End Point Accuracy Same as reference oscillator accuracy Sweep Speed Selectable 0 1 sec 1 sec or 50 sec per sweep Auto or Single Sweep Output 0 to 8V stepped ramp 100 or 1000 equal steps depending on sweep speed Manual Sweep Synthesized search dial allows manual sweep over width selected in 1000 steps LED dispiay follows output frequency during manual sweep Single Sweep Initiated by momentary contact key Frequency Stepping After a step size has been entered on the keyboard depressing f or button will increment frequency up or down by the desired step size The knob can also be used to vary the frequency by that same step size Step Accuracy Same as reference os
24. EFERENCE INPUT Used when an external standard of 5 or 10 MHz is used 1 REFERENCE OUTPUT Provides the capability of using the internal reference as a time base in external equipment 11 12 14 SELECTOR Selects INT or EXT reference 16 REMOTE INPUTS When the instrument is operated in the remote mode all functions of the instrument are controlled by the remote programming device Front panel controls except for LINE STBY ON have no effect on operation of the instrument 3 2 Model 8660D ni ch ate s 6660 SYNTHESIZED SIGNAL PENERATOR e 5 ouENeY cami n Ed Pts Ue Figure 3 1 Front and Rear Panel Features 16 Operation 3 3 Operation Mode 8660D 3 3 OPERATOR S MAINTENANCE Operator s maintenance of the HP 8660D Synthesized Signal Generator mainframe is limited to fuse replacement 3 4 OPERATING PRINCIPLES The HP 8660D may be operated by front panel controls in the local mode or externally programmed in the remote mode Allow the system to warm up for 15 minutes before operating The power requirements and safety precautions listed throughout this manual must be observed to preserve the built in safety features of the HP 8660D 3 5 LOCAL OPERATION In the local mode of operation all functions of the mainframe are controlled by front panel controls except when an external reference oscillator is used When an external reference oscillator is used the rear panel SELECTOR switch
25. ES HP SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at SAFETY CONSIDERATIONS GENERAL This product and related documentation must be re viewed for familiarization with safety markings and instructions before operation This product is a Safety Class 1 instrument provided with a protective earth terminal BEFORE APPLYING POWER Verify that the product is set to match the available line voltage and the correct fuse is installed SAFETY EARTH GROUND An uninterruptible safety earth ground must be pro vided from the main power source to the product input wiring terminals power cord or supplied power cord set SAFETY SYMBOLS Instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual refer to Table of Contents A Indicates hazardous voltages L Indicates earth ground terminal WARNING The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal in jury Do not proceed beyond a WA
26. ION Sweep Mode FM Deviation FM Sweep Off WO AM Depth AM Auto Sweep Wi OM Deviation PM Single Sweep w2 Modulation Off MO Single Sweep Trigger W3 Moduiation Level PC FM Calibration FC Sweep Rate Modulation Degrees DG SL T1 EM 2 gt CN MED RS T2 FAST E T3 _ DISPLAY Biank CF Display DB UNITS Output CF Display DO GHz GZ MHz MISCELLANEOUS kHz HP 18 OLD Mode Hz HP 1B NEW Mode dBm Register Ciear dBm 1 FM code must be followed by up to 3 digits of FM deviation followed by the units For example FM150KZ 2 AM depth must be programmed using PC 3 PM depth must be programmed using DG 4 If CN is not programmed in when the modulation section is 86632B or 86635A the FM or AM modulation will be twice the value programmed 3 12 Model 8660D Operation 3 10 HP iB CAPABILITIES E Refer to the following table for a synopsis of HP IB operations the HP 8660D is capable of performing Table 3 3 HP IB Capabilities Related HP IB Commands interface Capability Applicable Response and Functions Controis All Front Panel functions and Remote only functions are programmabile except knob rotation and all shift key functions SH1 PARUN LOCAL Trigger No The Signal Generator does not have a device trigger capability RR Ei 7 Local Lockout The Signa Generator responds to the LLO b bus command ae The Signal Generator does not respond to the DCL or SDC bus
27. Local_operation 330 GOTO 330 i 340 i 350 Center_freq Input and program center frequency 360 DISP Enter center frequency in MHz 370 INPUT Center_freq 380 GOSUB Set_center_freq 390 PERURI 400 410 Rf level Input and program RF level 420 DISP Enter Rf level in dBm 430 INPUT Rf_level 440 GOSUB Set rf level 450 RETURN 460 470 Modulation a Input type of modulation desired and enable 480 t softkey selection 490 DISP Enter type of mod AM FM PHASEM or none 500 INPUT Modulation 510 IF Modulation AM THEN 520 ON KEY 6 LABEL AM GOSUB Am 530 GOSUB Am 540 RETURN 3 14 Model 8660D Operation eer 550 560 570 580 590 600 610 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 820 830 840 850 860 870 880 890 900 10 920 930 940 950 960 970 980 990 1000 1010 1020 1030 1040 1050 1060 1070 1080 1090 1100 1110 1120 1130 1140 1150 1160 1170 1180 1190 1200 END 1F IF Modulation FM THEN ON KEY 6 LABEL FM GOSUB Fm GOSUB Fm RETURN END IF IF Modulation PHASEM THEN ON KEY 6 LABEL PHASEM GOSUB Phasem GOSUB Phasem RETURN END IF IF Modulation none THEN OUTPUT 719 M0 OFF KEY 6 RETURN END IF GOTO Modulation f Am f AM modulation selected Enter desired AM depth DISP Enter AM depth in percent INPUT Modulation GOSUB Set_mod_ source GOSUB Set_am depth RETURN l 5 Fn t FM mod
28. MHz SWEEP WIDTH and place the SWEEP MODE in the SINGLE position Connect the RF output to the RF INPUT of the spectrum analyzer to display the 50 MHz signal Press the SINGLE SWEEP key Display should read 50 000000 MHz The spectrum analyzer display is swept once from 40 to 60 MHz Modulation Piug ins Since the modulation plug ins are not affected by the mainframe except for digital control signals operator s checks for the modulation plug ins are not included in the Operator s Checks Refer to the individual manuals for the modulation plug in operator s checks 3 7 ERROR CODES Table 3 1 explains the meaning of all error codes the HP 8660D Digital Control Unit DCU is programmed to output Note that errors 01 05 can be redisplayed by pressing the blue SHIFT ERROR 3 8 HP IB PROGRAMMING OLD AND NEW CODES EXPLAINED The HP 8660D features a new DCU section which recognizes two versions of HP IB code The version used by the HP 8660A HP 8660B and HP 8660C is termed OLD It is the only code recognized b the HP 8660D after being powered up or reset or when the command OLD is sent via HP IB An extended version of HP IB codes is termed NEW and these codes are the only ones that can be used after the command NEW is sent The NEW codes can also be used when adding to existing programs which may contain OLD codes Simply send the command NEW for code being added and send the comm
29. ON This section provides the information needed to install the Synthesized Signal Generator Included is information pertinent to initial inspection power requirements line voltage selection power cables interconnections operating environment remote selection rack mounting storage and shipment 2 2 INITIAL INSPECTION To avoid hazardous electrical shock do not perform electrical tests when there are signs of shipping damage to any portion of the outer enclosure covers panels meters 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 electrically Procedures for checking electrical performance are given in Section 4 If there is mechanical damage or defect incompleteness or if the instrument does not pass the electrical performance test notify the nearest Hewlett Packard office 1f y the shipping container is damaged or the cushioning material shows signs of stress notify the carrier f as well as the Hewlett Packard office Keep the shipping materials for the carrier s inspection 2 3 PREPARATION FOR USE Power Requirements The Synthesized Signal Generator requires a power source of 100 120 220 or 240 Vac 5 to 10 48 to 400 Hz Power consumption is 400 VA maximum CAUTION To prevent damage to the instrument make th
30. P 8660D functions can be selected by front panel controls or by a remote controller RF plug in functions can also be remotely programmed through the mainframe circuits Service information descriptions and operating instructions for the various plug in sections are provided in separate manuals 1 10 EQUIPMENT AVAILABLE A service kit HP 11672A is r commended for servicing and adjusting the mainframe and the plug in sections Contents of the service kit are listed in Table 1 2 Individual items in the kit may be ordered separately if desired General Information Model 8660D Table 1 1 HP 8660D Specifications 1 of 2 Electrica Characteristics Description Frequency Selection Keyboard control panel allows selection of CW or center frequency by entry keys or synthesized tuning dial The least significant digit is 1 Hz Reference Oscillator Internal 10 MHz quartz oscillator Aging rate less than 3x10 9 24 hours after 30 day warmup Standard External Rear panel switch allows operation from any 5 MHz or 10 MHz signal at a level between 0 5V and 2 5V rms into 17022 Stability and spectral purity will be partially determined by characteristics of external reference oscillator Reference Output Rear panel BNC connector provides output of signal selected INT or EXT at the following levels into 1700 Internal Reference 0 75V to 1 5 Vrms External Reference Nominally equa to external input Display Ten digit numerical LE
31. P 8660D will function correctly with associated RF and modulation sections when the error voltages are within these limits It is recommended that the abbreviated adjustment procedure be performed regularly every six months to insure trouble free performance of the HP 8660D HP 86680 Me es TEF o OSCILLOSCOPE E colo Soba 05 o 220 Q o o oo Figure 4 3 Phase Locked Loop Test Setup Equipment Oscilloscope with 10 1 divider probes verdades rr RS EELS Cease HP 54200A Procedure NOTE Set the HP 8660D Line switch to ON and allow the instrument to warm up with the covers on for at least six hours before starting the measurements The warm up period is required to stabilize the internal temperature 1 Set up the test equipment as shown in Figure 4 3 2 Adjust the oscilloscope as follows VOLTSIDIV is Udi En id ARA Sones ewe Crewe gw em 0 01V TIMED AA Bon wk DS Re tke OR a eT Ce BS he eh oem eta Tes 10 us MODE cotas dos in A E Sx E eO EOS DC COUPLED GROUND POSITION ooo da 1 ade Pos Segoe he Nes CENTER OF DISPLAY 4 5 Performance Tests Model 8660D NOTE All of the test points except for the HF loop are located on the Low Frequency motherboard Access to these test points is obtained by raising the Ad assembly and locking it in the up position see Figure 4 3 Figure 5 23 shows the approximate location of all test points The reference designators of the test points are etched on the pe board Access to
32. POWER and FM CAL controls and the SHIFT POWER and LOCAL keys are inhibited 4 Digital sweep may not be operated in the remote mode of operation 5 When changing from the local to the remote mode of operation the temporary storage register should be cleared before a remote entry is made 6 The data level inputs to the Model 8660D are as follows approximately 0 volts TTL LOW 1 and approximately 2 8 volts TTL HIGH 0 sometimes referred to as negative or ground true logic In BCD remote operation two four bit parallel codes are applied to the instrument circuits through a rear panel connector J3 These inputs if numeric data are converted to BCD digit serial information and clocked into a temporary storage register If the inputs are address information they are used to direct a clock to strobe the data from the temporary storage register into the desired final storage register When all of the significant data entries have been stored in the temporary storage registers the least significant digit is stored in a position to allow it to be the first digit strobed out then the next least significant digit etc so that the information will be stored in the appropriate register in the same sequence in which it was received Operation of the storage registers not located in the HP 8660D mainframe is detailed in the manuals for the plug in sections Examples 1 7 provides examples of programming the registers which may be programmed when
33. RANTY This Hewlett Packard instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment During the warranty period Hewlett Packard Company will at its option either repair or replace products which prove to be defective For warranty service or repair this product must be returned to a service facility designated by HP Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to HP from another country HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument HP does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYERS S SOLE AND EXCLUSIVE REMEDI
34. RNING sign until the indicated conditions are fully understood and met The CAUTION sign denotes a haz ard It calls attention to an operating procedure practice or the like which if not correctly performed or adhered to could result in dam age to or destruction of part or all of the product Do not proceed beyond a CAUTION sign until the indi cated conditions are fully understood and met WARNING Any interruption of the protective ground ing conductor inside or outside the instru ment or disconnecting the protective earth terminal will cause a potential shock hazard that could result in personal injury Ground ing one conductor of a two conductor outlet is not sufficient protection _ Whenever it is likely that the protection has been impaired the instrument musi be made inoperative and be secured against any unin tended operation If this instrument is to be energized via an autotransformer for voltage reduction make sure the common terminal ts connected to the earth terminal of the power source Servicing instructions are for use by service trained personnel only To avoid dangerous electric shock do not perform any servicing unless qualified to do so Adjustments described in the manual are per formed with power supplied to the instrument while protective covers are removed Energy available at many points may if contacted re sult in personal injury Capacitors inside the instrument may still
35. and OLD before the program goes back to a section of OLD code The advantages of the NEW over the OLD programming code includes e Frequency units of GHz MHz kHz and Hz are used No conversion to Hz necessary e No digit reversal required e Desired output level is entered directly in dBm or dBm No adjustment is needed to compensate for a 13 dBm reference level e Programming syntax is consistent with other HP signal generators currently being manu factured Model 8660D Operation Table 3 1 Error Codes This error occurs when an error is detected during power up RAM TEST can be redisplayed by pressing the blue SHIFT ERROR This error occurs when an error is detected in ROM Checksum during power up can be redisplayed by pressing the blue SHIFT ERROR This error occurs when a Read error occurs during the Read Write test of the instrument interface PIA A1A3U8 ports during the power up Self Test can be redisplayed by pressing the blue SHIFT ERROR This error occurs when a Read error is detected during the Read Write check of the BCD Interface PIA A1A5U7 during the power up Self Test can be redisplayed by pressing the blue SHIFT ERROR This error occurs when in the Sweep Mode and the Sweep Width has been selected such that it will cause the CW to sweep to a Frequency below 0 Hz or above the maximum output frequency of the RF plug in can be redispiayed by pressing the blue SHIFT ERROR
36. ary Coded Decimal 1 2 INTRODUCTION TO THE OPERATION AND CALIBRATION MANUAL This manual contains information required for a qualified person to install operate test adjust and service the Hewlett Packard Model 8660D Synthesized Signal Generator mainframe The HP 8660D will generally be referred to as the Signal Generator throughout the manual The Operation and Calibration Manual is comprised of five sections as described below Volume Operation and Calibration Manual Section General Information General Information covers instrument specifications options equipment available and recommended test equipment Section li Installation Installation covers initial inspection preparation for use and storage and shipment l Section Ii Operation Operation provides HP IB operating information and detailed operating information for either the beginning or experienced user Section IV Performance Tests Performance tests enable you to check the performance of the instrument against the specifications listed in Table 1 1 Section V Adjustments Adjustment A A provide information required to adjust and align the instrument after repairs are made 1 3 WHERE TO FIND INSTRUMENT SPECIFICATIONS Instrument specifications are listed in Table 1 1 These specifications are the performance standards or limits against which the instrument can be tested 1 1 General Information Model 8660D 1 4 WHERE TO FIND SAFETY CONSIDERATIONS
37. ation o 0 3 16 BCD Remote Operation s o c c ha pd ene a Aa A AS a 3 17 Data Inputs ire AE ES A SRS Sa eR Oe es A Dees ee 3 20 Flag Signal DRA eS Sy eR er een eR eS DE OS EN Sete eee eee 3 20 A oors ne e A BOR deka Ac ee eat he wee ee eee ar amp eo ek ee 3 20 Introduction lt A AL A a aa dr Mo ees eee 4 1 Equipment Required o ra seta ade le Sia eee he E AA E AR A a dp 4 1 Test Record a a A A A SIG RES daa ae as eee cae 4 Performance Test 1 Internal Crystal Oscillator Aging Rate 4 Performance Test 2 Reference Test o eee 4 4 Performance Test 3 Phase Locked Loops Test 4 5 Section 5 Adiustments Introduction di AE A NR ALA A AAA is ae Se 5 1 Periodic Adjustments Required da 0 AR AO AE EA A BEE AE RES 5 1 Equipment Required 2000 sasas A A e A AA E Sicha seh Are o 0 1 Adjustment A A AAA 5 1 Factory Selected Components e a ro da a da AAA 5 2 Related Adjustments i aaa AA O EVA ASAS RS Ae ad Bere wee 5 2 Adjustment Locations IE E RAR ARA e RA 5 2 Checks and Adjustments ao oa E a da E 5 2 Safety Considerations nic A bie AAA ia e RAE E AAA A E la dad A 5 2 Adjustment 1 Phase Locked Loops Abbreviated o o o 5 5 Adjustment 2 Power Supply 2 4 4 e848 4 98 6 GW a Rie ON Ow ae SH Ee ae oe 5 9
38. ation may then be used as reference in later tests 5 9 SAFETY CONSIDERATIONS 5 2 Although this instrument has been designed in accordance with international safety standards this manual contains information and warnings which must be followed to ensure safe operation and to retain the instrument in a safe condition see Section II Service and sejusiments should be performed only by qualified service personnel Any interruption of the protective grounding conductor inside or outside the instrument or disconnection of the protective earth terminal is likely to make the apparatus dangerous Intentional interruption ts prohibited Any adjustment maintenance and repair of the opened instrument under voltage should be avoided as much as possible and when inevitable should be carried out only by a skilled person who is aware of the hazards involved The opening of covers or removal of parts may expose live parts and accessible terminals may be live Capacitors inside the instrument may still be charged even if the instrument has been disconnectea from its source of supply Model 8660D Adjustments Make sure that only fuses with the required rated current and of the specified type normal blow time l delay etc are used for replacement The use of repaired fuses and the short circuiting of fuseholders must be avoided Whenever it is likely that the protection has been impaired the instrument must be made inoperative and be secu
39. bility with associated components Factory selected components and suggested range of values are listed in Table 5 2 The recommended procedure for replacing a factory selected component is as follows a Try the original value then perform the test specified in Section V of this manual for the circuit being repaired b If the specified test cannot be satisfactorily performed try the typical value shown in the parts list and repeat the test c If the test results are still not satisfactory substitute various values within the tolerances specified in Table 5 2 until the desired result is achieved 5 6 RELATED ADJUSTMENTS Most of the adjustments within any given phase lock loop are interrelated This is especially true in digital to analog converters Adjustments should be made in the order in which they appear for any given loop Generally it will not be necessary to adjust any of the phase lock loops except the one in which the component failure occurred An exception to this will be when adjustment to any phase lock loop has been attempted while the reference section is not functioning properly 5 7 ADJUSTMENT LOCATIONS Adjustment locations are identified pictorially on Section VIH foldout service sheets referred to in t individual procedures and in Figures listed in the individual procedures 5 8 CHECKS AND ADJUSTMENTS Data taken while following the adjustment procedures should be recorded in spaces provided This inform
40. ble to the RF Voltmeter as shown in Figure 5 10 4 Adjust A22A1C3 using a non metallic tool accessible through hole in A22 assembly for maximum reading on the RF Voltmeter 5 Adjust A22A1R2 accessible through a hole in the A22 assembly for an RF Voltmeter reading of 270 mVrms 6 Reconnect the Reference Input cable to A4J5 5 18 Adjustment 5 Model 8660D Adjustments Adjustment 6 HIGH FREQUENCY SECTION e Service Sheets 4 5 and 6 Description The High Frequency Section contains a voltage controlled oscillator which provides eleven discrete output frequencies from 350 to 450 MHz in 10 MHz steps The output of the voltage controlled oscillator is phase locked to a 10 MHz reference derived from the master oscillator in the reference section The output from the HF section is used in the RF Section plug in or in the internal frequency extension plug in module These checks verify proper operation of the High Frequency Section circuits PULSE GENERATOR SPECTRUM ANALYZER Figure 5 11 Phase Detector Response Adjustment Test Setup Test Equipment Brequency Counter A A A TRAS AA AAA HP 5385A Digital Voltmeter 2000 ER A AN O ABN se os HP 3478A Pulse Generator id ia A A AAA AA AA AA HP 8011A Spectrum Analyzer cian EE E E eee eks HP 8590A Oscilloscope with 10 1 divider probes o o o ooomoo o Ae ig Sot EEEE ARAA HP 54200A Signal Generator Test Oscillator oooomooororooorarnorccnarrcncro rete rro r
41. cillator accuracy When using 86603A RF section above 1300 MHz least significant digit becomes 2 Hz Model 8660D General Information Table 1 1 HP 8660D Specifications 2 of 2 Electrical Characteristics Remote Programming Frequency CW frequency is programmable over entire range with same resolution obtained in manual operation Frequency Step ft or may also be programmed to change the output frequency by a previously selected step size Output Level Programmable in 1 dB steps over the output range of the RF section installed for output level accuracy see RF section specifications See specifications for modulation and RF section installed Mating Connector Types Modulation Programming input BCD interface 36 pin Cinch type supplied HP 1B interface 24 pin Cinch type 57 supplied with option 005 Logic TTL compatible negative true 0 logic state corresponds to 2V or higher 1 logic state corresponds to 0 8V or lower 0 to 55 C Meets radiated and conducted limits of MIL STD 4618 at frequencies above 100 kHz 100 or 120 Vac 5 10 at 48 to 440 Hz 200 or 240 Vac 5 10 at 48 to 66 Hz 400 VA maximum Operating Temperature Range Weight Signal Generator only Net 23 2 kg 51 Ib shipping 28 6 kg 63 Ib All functions controlled from the front panel with the exception of the power switch and
42. commands The Signal Generator s Remote mode is enabled when the REN bus line is true However it remains in local that is the keyboard is active until it is first addressed to listen The RF output power level goes to its minimum level upon entering the remote mode The front panel REMOTE indicator turns on when in the remote mode Clear The Signal Generator returns to the local mode when the REN REN a lockout Set bus line goes false local Pass control Take control The Signa Generator does not pass or take control of the HP IB bus ATN IFC Ci C2 C3 C28 Status Byte SPE SPD T6 MTA Status Bit 4 ATN E01 neal abot ves The Signal Generator stops listening T6 L3 Commands Control lines and interface Functions are defined in IEEE Std 488 and the identical ANSI Standard MC1 1 Knowledge of these might not be necessary if your controllers manual describes programming in terms of the tweive HP IB Messages shown in the left column Require The Signal Generator does not activate the SRQ bus line Service The Signal Generator does not respond to a seria poll enable The Signal Generator does not respond to a ci poll enable Complete HP IB capability as defined in EEE Std 488 and the identical ANS Standard MC1 1 is SH1 AH1 T6 TEO L3 LEO SR1 RL1 PPO DC1 DTO Ci C2 C3 C28 E2 Operation Model 8660D 3 11 EXAMPLE PROGRAM This program
43. ct an HP IB cable to the rear panel requires an adapter HP Part Number 08660 60187 This adapter ts si with instruments ordered with Option 005 Option 100 HP 11661B factory installed Option W30 Extends hardware support three years Mechanical Options Option 908 Adds a rack mount kit If the HP 8660D was purchased without the rack mount option the kit may be ordered from the nearest Hewlett Packard office using HP part number 08660 60347 Manual Options Option 910 Adds Extra Manual Set 1 additional Operation Calibration Manual plus 2 Service Manuals Option 915 Adds Service Manual 1 copy 1 9 GENERAL OPERATING PRINCIPLES All of the signals generated in the HP 8660D are phase locked directly or indirectly to a 100 MHz master oscillator in the reference section The 100 MHz master oscillator is phase locked to an internal temperature controlled oscillator or to an external standard Provisions are made for the internal oscillator to be used as a reference signal for other equipment The HP 8660D uses synthesizer techniques to provide digitally controlled precise RF signals which are used in the RF Section output plug ins to produce the selected output frequency The output frequencies are exactly those selected in 1 Hz or 2 Hz increments Six phase locked loops all phase locked to the 100 MHz master oscillator are used to generate the RF signals used in the RF Section plug ins to produce the final output signal l The H
44. dout by pressing the blue SHIFT key then the STEP f or STEP key MANUAL MODE can be used for changing the center frequency Choose STEP mode and the TUNING knob will increment the frequency by the same value stored in the STEP register The other increments selected by the MANUAL MODE key are 1 Hz FINE 1 kHz MED and 1 MHz COARSE 3 6 OPERATOR S CHECKS NOTE If the instrument ts returned for service be sure to attach a blue repair tag located at the end of this manual with failure information During final checkout at the factory the HP 8660D Synthesized Signal Generator mainframe is adjusted for proper operation No adjustments should be required when the instrument is received The following operator s checks are based on the assumption that properly operating RF Sections and Modulation Sections are in place during the tests Refer to the manuals for the specific plug ins for operating parameters The steps listed in the Operator s Checks need not be followed in the sequence listed Their purpose is to aid operators in familiarizing themselves with the instrument and to provide assurance that all functions of the instrument are operating properly Many of the tests specified in the Operators checks do not apply specifically to an RF Section plug in Those checks which do not refer to a specific RF Section apply equally to the HP 86601 HP 86602 and HP 86603 When procedures apply to specific RF Sections only this informat
45. e line voltage selection BEFORE connecting the line power Also ensure the line power cord is connected to a line power circuit that is provided with a protective earth contact Line Voltage Selection 2 1 Installation 2 2 A rear panel line power module A7 permits operation from 100 120 220 or 240 Vac The number visible in the window located on the module indicates the nominal line voltage to which the instrument Model 8660D must be connected To prepare the instrument for operation slide the fuse compartment cover to the left the line power cable must be disconnected Pull the handle marked FUSE PULL and remove the fuse rotate the handle to the left Gently pull the printed circuit voltage selector card from its slot and orient it so that the desired operating voltage appears on the top left side see Figure 2 1 Firmly push the voltage selector card back in its slot Rotate the FUSE PULL handle to the right install a fuse of the correct rating and slide the fuse compartment cover to the right Power Cable This instrument is equipped with a three wire power cable When connected to an appropriate 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 Table 2 1 for the part numbers of the NOTE For 110 120V line use 4A slo blo fuse HP part number 2110 0635 For 220 240V line use 2A slo blo fuse
46. eee wees O HP 54200A Procedure 1 Set up the test equipment as shown in Figure 5 21 2 Set the HP 8660D center frequency to 0 MHz Ground A2TP8 on the A2 Motherboard Adjustment 10 5 31 Adjustments 5 32 Model 8660D NOTE The A2 Motherboard test points used in this procedure are covered by the interface boards AZA1 and A3A2 The HP 8660D will not function with the interface boards removed The best way to access these test points is to use a short piece of wire 14 AWG with one end filed to a point The pointed end of the wire can be forced into the test points located between the interface boards Then the oscilloscope or DVM probe can be connected to the other end of the wire Likewise instead of using the plug in jumper to short TP 8 to ground insert the piece of wire into TP8 and connect a Jumper from the wire to ground The HP 8660D DCU must be moved forward to gain access to TP5 See Remote Selection in Section 2 for this procedure Connect the voltmeter to A2 Motherboard TP5 Adjust A11R19 for a DVM reading of 30V 0 1 Vdc Remove the voltmeter from TP5 Connect the counter to the A2 Motherboard TP6 SL2 OSC Adjust A11C17 for a counter reading of 30V 0 02 MHz Set the HP 8660D center frequency to 94 5 kHz Adjust A11R19 for a counter reading of 20 55 0 02 MHz Set the HP 8660D center frequency to 4 5 kHz Adjust A11R15 for a counter reading of 29 55 0 02 MHz The adjustments in steps
47. eing adjusted continue with Step 5 If the SL1 SL2 or HF loop is being adjusted jump to step 7 5 Set the HP 8660D to the center frequencies in Table 5 5 for the loop that is being adjusted At each frequency setting record the voltage level displayed on the oscilloscope Ensure that the loop remains locked at each of these settings Adjustment 1 Model 8660D Adjustments 6 When all voltages have been recorded for the loop being adjusted do the following 3 Add all voltage readings and enter as the SUM value Divide the Sum value by 10 and enter the average AVG Reverse the sign polarity of the AVG value and enter this figure as the Adjust value Once again set the HP 8660D CF to the corresponding frequency value under the Adjustment 1 of Table 5 4 column for the loop being adjusted and adjust the potentiometer in the Adj Point column to make the de value of the oscilloscope trace equal to the calculated Adjust Value in Table 5 5 Return to Step 3 and repeat the procedures until the N1 N2 and N3 loops are adjusted 7 In Table 5 5 locate the HP 8660D frequency values given for the loop that is being adjusted SL2 SL1 or HF Loops At each frequency setting adjust the potentiometer under the Adjustment 1 column for a level of OV 100mVdc on the oscilloscope 8 Return to Step 3 and repeat the procedures until the SL2 SL1 and HF Loops are adjusted Adjustment 1 5 7 Adjustments Model 8660D Table 5 5 PLL Adjustment
48. el j Output programmed RF level to the 8660 OUTPUT 719 AP Rf_level dm RETURN Set_am_depth Output programmed AM depth to the 8660 OUTPUT 719 M Mod_source AM Modulation PC RETURN J fm dev Output programmed FM deviation to the 8660 OUTPUT 719 M Mod_source FM Modulation KZ RETURN 1 Set_pm_dev i Output programed Phase deviation to the 8660 OUTPUT 719 M Mod_source PM Modulation DG RETURN END HP IB Address Selection The Signal Generator s address is set to 19 at the factory by an internal switch located inside the instrument This address can be locally changed using either the front panel function SET ARRS or the internal switch The HP IB address cannot be changed by remote command It is simpler to change the address from the front panel than from the internal switch However it is a more permanent change to change the address using the internal switch The address set from the front panel reverts to the address set by the internal switch whenever the instrument is turned off then on again Changing the Address from the Front Panel Available addresses are from 00 to 30 Example of changing the address to 15 15 SET ADRS SHIFT 1 Changing the Address Using the Internal Switch For a procedure for changing the address using the internal switch refer to Remote Selection in Section 2 of this manual Further HP IB Programming Information For more information about HP IB ref
49. er the A3AI and A3A2 assemblies TP3 can be reached by using a piece of solid wire to probe down into the test point TP8 is connected to XA12 1 pin 4 which is accessible 3 In Table 5 4 PLL Adjustment Points connect the oscilloscope probe to the test point corresponding to the loop being adjusted start with N1 Loop TP 17 Set the HP 8660D CF to the frequency value under the Adjustment 1 column then the Adjustment 2 column adjusting the corresponding potentiometer for OV 50 mVdc Adjustments 1 and 2 are interactive Repeat the adjustments until both measurements are correct NOTE The trace displayed on the oscilloscope should be a dc level It is normal for some ac components to appear on the trace However if the peak to peak amplitude of the ac component Is greater than 200 mV the loop is probably not locked Also if the trace cannot be adjusted to the required level the loop is probably not locked In either case the full adjustment procedure should be performed Table 5 4 PLL Adjustment Points Adjustment 1 Adjustment 2 Loop Adj Point Adj Point Ni TP17 9 5MHz A17R31 0 5 MHz A17R28 N2 TP10 95 5 MHz A13R37 5 5 kHz A13R39 N3 TP3 95Hz ABR26 5 Hz ABR24 SL2 TPS 94 5 kHz A11R19 4 5 kHz A11R15 SLi TP14 9 45MHz A19R9 0 45 MHz A19R3 HF PHASE ERROR 0 MHz A4A6R20 0 90 MHz A4AGR20 PROFILE 2 if an 86601A AF Section is installed set CF to 100 0 MHz 5 6 4 If the N1 N2 or N3 loop is b
50. er to one or all of the following documents IEEE Standard 488 1978 ANSI Standard MC1 1 Improving Measurements in Engineering and Manufacturing HP part number 5952 0058 the Hewlett Packard catalog of Electronic Systems and Instruments Tutorial Description of the Hewlett Packard Interface Bus HP part number 5952 0156 Model 8660D Operation Data Input ce Data input must be present for full E duration of command input Command input i 100 ns Min Fiag Output 80 uS oe w w e an am m a an a b ga ae Command Pulse Input To Enter Qualitier Address Combination 2 AY mammy penne And Execute The Non valid Command lt 0 4V Ll 100 ns Minimum 30 us o be Error Line Stays Low Error Output gt 2 4V a Until a new Valid i t Frequency is Entered lt gt 0 4V i at saa a i Command Pulse input a i ae lt 0 4V h 100 ns Minimum 60 us until restoration f ERROR output Error Output gt 2 4V gt pu lt 0 ay Figure 3 3 HP 8660D Data Input and Error Output Timing rev 09FEB91 3 19 Operation Model 8660D Data Inputs Data inputs logic 1 0V must be referenced to the command pulse as shown in Figure 3 3 The dat inputs may be terminated after the command pulse trailing edge The command pulse causes the input data to be stored in the temporary storage register or if the data input is an address to be stored in one of the final storage registers These
51. ersus Exact Output Levels 1 000000 MHz 1 000799 MHz 1 000800 MHz 1 000999 MHz 1 001000 MHz Nominal step size 8 mV Hz 5 36 Adjustment 12 Model 8660D Adjustments A2 MOTHERBOARD SOLDER SIDE O O O 1P17 ESE EEES AA A AAA AAA O a TP14 A O Q TPig O 3 TP8 O 0 o XA9A1 Oo 2 Y Jol___we gt TP3 Figure 5 23 A2 Test Point Locator 5 37 38
52. ess or change programmin format HP IB to BCD or BCD to HP IB Setting of the HP IB address should be performed only by service trained persons who are aware of the potential shock hazard of working on an instrument with protective covers removed To avoid hazardous electrical shock the line Mains power cable should be disconnected before attempting to change the HP IB address With the instrument in front of you as if in operating position 1 Make certain no power is connected to the instrument 2 Remove the top cover 3 Locate DCU module and trace power cable bundle one black wire one red white wire one white wire from DCU module back to a connector mounted on the chassis Remove the right side screw and pull the connector loose Remove the 2 ribbon cables from the DCU Rotate the instrument clockwise onto its right side Remove the bottom cover 3 TD Ot A To remove the DCU module locate and remove 4 recessed screws fastening each corner of the DCU front to the chassis With the instrument up on its side screws are located on the right and left sides 8 Slide the DCU out through the front of the instrument and turn it upside down to further disassemble St Remove 4 screws holding the DCU bottom cover and lift bottom cover up exposing 3 circuit boards co 10 Remove the board furthest back A1A5 by pulling straight up out of mounting connectors With the A1A5 board removed the HP IB add
53. external reference is being used disconnect the source Allow at least 15 minutes warmup time for the oscillator to stabilize and adjust A4A4C2 for a counter readout of 100 000 MHz 20 kHz Disconnect the frequency counter Connect the Spectrum Analyzer RF INPUT to the 100 MHz output of the A4A4 assembly and tune the Spectrum Analyzer CENTER FREQUENCY to 100 MHz The 100 MHz signal should be gt 10 dBm see Figure 5 5 and 5 6 Disconnect the Spectrum Analyzer and enable the 100 MHz phase lock loop by returning the INT EXT switch to INT or by reconnecting the external standard NOTE Steps f through p need to be performed only if the 100 MHz output signal is low or if the total harmonic distortion in the FM mode is gt 1 Use a standard flatblade screwdriver to kios the fastener which locks the A4 assembly i place Rotate A4 up and to the right until it locks into position Disconnect W6 and A23W9 from the A4A8 100 MHz Band pass Filter Assembly Connect W6 to A23W9 Set the Synthesized Signal Generator controls for a center frequency of 100 MHz at 10 dBm Set the spectrum analyzer controls as follows A oc saan genet 42 by nd aera ade enews G Vad awe AEE Sk 100 MHz Frequency Span Per Division rad da sank now eee eet dead 5 MHz Resolution Bandwidth 2d a seems 100 kHz Input Attenuation AAA IRA era 20 dB Vertical Sensitivity Per Division 44454 ri hw bt edhe eee de das o4dd a oOo 10 dB Reference Leve
54. ference To optimize performance of 500 MHz tuned ampiifier Loop A4A408 To optimize performance of 100 MHz tuned amplifier se Loop A4A4R29 Reference VCO To compensate for variations in the 100 MHz reference 42 2 to 422 ohms and Divider output level Selected for an output level of 11 to 13 dBm into a 50 ohm load at the output of A4A8 Range of Vaiues Referance 38 to 72 pF Loop Adjustments Model 8660D Table 5 2 Factory Selected Components 2 of 2 A4A5C7 08 HF Loop VCO 7 5 to 24 pF C13 C14 C19 C20 If one or more of the amplifiers in the 340 to 450 MHz tuned amplifier stages are overdriven a one half fraquency harmonic spur will track the output signal Reduce the drive to the overdriven stage by decreasing the value of the appropriate capacitor After selecting a capacitor be sure there is sufficient output to drive the amplifier To compensate for variations in the 350 450 MHz output See Table 5 3 level Selected for a level of 10 to 13 dBm To compensate for variations in the 350 450 MHz output See Table 5 3 level to the phase detector Selected for a level of 10 to 12 dBm A4A6CE HF Loop To ensure tuning range sufficient to trap the 10 MHz 16 to 24 pF signal A4A6R19 HF Loop To center the travel of ASASRZO Profile Adjust center the travel of A4A6R20 Profile To center the travel of ASASRZO Profile Adjust 215 t0 422 ohms 215
55. from 40 to 60 MHz The sweep rate selected by the SWEEP RATE key is as follows FAST 100 steps at 1 millisecond per step MED 1000 steps at 1 millisecond per step and SLOW 1000 steps at 50 milliseconds per step When the SWEEP MODE key is in the SINGLE mode pressing the SINGLE SWEEP key causes the output of the RF Section to be swept one time When the single sweep is completed the output of the RF Section returns to the selected center frequency The sweep width and sweep rate are selected in the same manner as they are in the AUTO mode Model 8660D Operation Manual Tuning When the SWEEP MODE key is in the MANUAL position the output frequency of the RF Section may be manually controlled by the TUNING knob In this mode the sweep width is still controlled by the information in the sweep register The selected sweep width in this mode is divided by 1000 and the output of the RF Section may be controlled in frequency steps that are 1 1000 of the sweep width Example with a 50 MHz center frequency and a 20 MHz sweep width output may be swept manually from 40 to 60 MHz in 20 kHz steps The center frequency may be stepped up or down in any increment within the frequency range of the RF Section in use Enter the desired increment and units then press STEP f or STEP The increment entered into the step register remains in the register until changed or the instrument is reset or placed in standby mode and may be displayed on the rea
56. ge for each phase locked loop is within normal operating limits but does not verify any instrument specifications The Operator s Checks in section 3 are useful for incoming inspections routine maintenance and general post repair checks Other instrument performance specifications depend on the modulation and RF plug in section installed The service manual for the associated plug in sections provide performance tests specific to the plug in 4 2 EQUIPMENT REQUIRED 4 3 TE E Equipment required for the performance tests is listed in the Recommended Test Equipment table in Section 1 Any equipment that satisfies the critical specifications given in the table may be substituted for the recommended models ST RECORD Results of the performance tests may be tabulated in the Performance Test Record Table 4 1 It is located on the last page of this section we suggest that you make several copies of the table for future use before the you perform the first performance test Test results recorded at incoming inspection can then be used for comparison in periodic maintenance and troubleshooting and after repairs or adjustments l 4 1 Performance Tests Model 8660D Performance Test 1 INTERNAL CRYSTAL OSCILLATOR AGING RATE Specifications Reference Oscillator Internal 10 MHz quartz oscillator Aging rate less than 3 parts in 10 per 24 hours after 30 day warmup Description This test verifies the reference oscillator aging rate
57. he level is between 11 and 13 dBm r If the level is incorrect change A4R29 to a lower value 42 20 minimum and peak the output level Continue until one output level is 12 1 dBm s Reconnect A23W9 to the output of the A4A8 Assembly Unlock A4 and return it to the original position Lock A4 into place 3 500 MHz Output Adjustment a Connect the Spectrum Analyzer RF INPUT to the 500 MHz output connector on the A4A4 assembly and tune the analyzer to 500 MHz Set the analyzer scan width to 50 MHz per division and other analyzer controls for a clear display see Figure 5 6 b Adjust A4A4C17 A4A4C23 and A4A4C31 for a peak amplitude of the 500 MHz signal The 500 MHz signal amplitude should be gt 3 dBm The 400 MHz signal observed at the 500 MHz output is typically lt 10 dBm The 600 MHz signal observed at the 500 MHz output is typically lt 20 dBm Disconnect the analyzer 500 MHz dBm 400 MHz dBr 600 MHz dBm 5 14 Adjustment 3 Model 8660D Adjustments 4 20 MHz Output Check j a Connect the Spectrum Analyzer RF INPUT to the 20 MHz output on the A4A4 assembly and tune the analyzer to 20 MHz The 20 MHz signal should be gt 6 dBm and lt 2 dBm Disconnect the analyzer 20 MHz COC Bm 5 Reference Section Outputs Not Previously Checked a Check the outputs listed in Table 5 8 for the levels shown see Figure 5 8 Table 5 8 Reference Section Output Levels 10 MHz gt 1 Vp p 2 MHz gt 2 2 Vp p 40
58. hey refer 5 2 PERIODIC ADJUSTMENTS REQUIRED The following table shows adjustments that should be performed at recommended 6 month but no longer than 1 year intervals Table 5 1 Periodic Adjustments Adjustment Adjustment 1 Phase Locked Loops Abbreviated _ Adjustment 2 Power Supply Adjustment 3 Reference Section 100 MHz Output All other adjustments need only be performed after repair or to correct instrument malfunction 5 3 EQUIPMENT REQUIRED Each adjustment procedure in this section contains a list of test equipment and accessories required to perform the procedure Each test setup identifies test equipment and accessories by callouts Minimum specifications for test equipment used in the adjustment procedures are detailed in Table 1 2 Because the HP 8660D Synthesized Signal Generator is an extremely accurate instrument minimum specifications in Table 1 2 are particularly important in performing these adjustment procedures 5 4 ADJUSTMENT AIDS The HP 11672A Service Kit is an accessory item available from Hewlett Packard for use in maintaining the HP 8660D Table 1 2 contains a detailed description of the Service Kit Any item in the kit may be ordered separately 5 1 Adjustments Model 8660D 5 5 FACTORY SELECTED COMPONENTS Some component values are selected at the time of final checkout at the factory Usually these values ar not extremely critical they are selected to provide optimum compati
59. ion is conveyed in the procedure NOTE Any operator s checks specified tn the plug in manuals should also be performed Initial Turn On Check 1 Set the rear pane line select switch in the line power module to be compatible with the available line power refer to Section 2 2 Connect the instrument to the power outlet use ground pin adapter for electrical systems having no ground outlet Operation E Model 8660D NOTE The instrument should remain connected to the power source in the STBY standby mode when not in use This will maintain a constant temperature in the crystal oven and eliminate the need for a warmup period 3 Place the POWER key STBY ON in the ON position Allow the system to warm up for 15 minutes before operating The cooling fan should start and the display should read 1 000000 MHz Keyboard Register and Readout Checks 1 Enter 1 234567890 Note that readout input steps from right to left Units annunciators GHz MHz kHz Hz should be off and the display should read 1 234567890 2 Press GHz key The display should read 1 234567890 GHz Units annunciator flashing 3 Press MHz key The display should read 1 234567 MHz Units annunciator flashing 4 Press kHz key The display should read 1 234 kHz Units annunciator flashing 5 Press Hz key The display should read 1 Hz Units annunciator flashing 6 Press the key The display should read 1 000000 MHz 7 Press 1
60. ipment Freguency Standard RA PP ae wea SW S VGN O HP 5065A Oscilloscope with 10 1 divider probes 00s6acisu caste ct eeeanaece dees ou stuees ous HP 54200A Spectrum Analyzer 00062 0000 dida a Ae mea este ta eet ees de HP 8590A Frequency Counter A IN AE HP 5328B Option 031 50 Ohm Feedthru Termination A A st cis aes HP 10100C Procedure 1 Set up test equipment as shown in Figure 5 3 2 Internal Reference Accuracy Adjustment see Figure 5 3 Allow adequate warmup time a Use the signal source to trigger the oscilloscope at the SYNC INPUT and connect the reference output from the HP 8660D rear panel reference output to the oscilloscope vertical input b Observe the 10 MHz sine wave on the oscilloscope and adjust the A21 oscillator until the oscilloscope display stops drifting c Set the oscilloscope to sweep at 0 1 Sec Division and the sweep magnifier to x10 If drift is observed readjust the A21 oscillator Adjustment 3 11 Adjustments 5 12 Model 8660D NOTE When the oscilloscope display drift is less than 1 division in 10 seconds the HP 8660D reference oscillator is set within 1 part in 10 of the signal source 3 100 MHz Output Adjustment a Connect the frequency counter to the 100 MHz output on the A4dA4 assembly see Figure 5 4 If the internal reference is being used place the rear panel INT EXT switch in the EXT position to open the 100 MHz phase lock loop If an
61. is written in BASIC for the HP 9826 computer The program will display a menu of softkey selections which allow you to enter frequency modulation amplitude frequency step an go to local or remote operation You must have a modulation plug in HP 86632B or HP 86635A and any RF section plug in to use all the features of the program Once the program is loaded and running press remote to display softkey selection 10 l 20 l 30 COMPUTER CONTROL OF THE 40 t HP 8660D 50 t USING THE 9826 60 l 70 RESTORE TESTSOD 80 t 90 DIM Input 6 Step_size 11 100 DIM Center _freq iil Rf_level 4 110 DIM Modulation 6 Mod_source 1 120 130 CLEAR 7 140 150 Local operation Enable local mode and give user choice of stopping 160 LOCAL 719 t program or going into remote mode 170 OFF KEY 180 ON KEY 3 LABEL STOP GOTO Stop_pgm 190 ON KEY 8 LABEL REMOTE GOTO Remote 200 GOTO 200 210 e 220 Remote E Enable remote mode and set 8660D to new programming 230 REMOTE 7 mode Provide softkey selection of frequency output 1 240 OUTPUT 719 NEW level modulation step size step up step down and 250 OFF KEY f local modes 260 ON KEY O LABEL FREQ GOSUB Center reg 270 ON KEY i LABEL MOD GOSUB Modulation 280 ON KEY 5 LABEL LEVEL GOSUB Rf_level 290 ON KEY 7 LABEL S SIZE GOSUB Set _5tep_size 300 ON KEY 3 LABEL UP GOSUB Step_up 310 ON KEY 4 LABEL DOWN GOSUB Step_down 320 ON KEY 8 LABEL LOCAL GOTO
62. kHz reference signal by disconnecting the cable from A4J3 and connect th 10 Lee 12 13 digital voltmeter to A2TP17 Adjust A16R38 for a digital voltmeter readout of OV 10 mV Reconnect the 400 kHz reference signal Set the HP 8660D center frequency to 9 5 MHz The frequency counter reading should be 20 200000 MHz Adjust A17R31 for a DVM reading of OV 100 mVdc at TP17 Set the HP 8660D center frequency to 0 5 MHz The frequency counter reading should be 29 200000 MHz Adjust A17R28 for a DVM reading of OV 100 mVdc at TP17 The adjustments in steps 10 and 11 are interactive Repeat these steps until the DVM reading is within tolerance at both frequency settings Enter the center frequencies shown in Table 5 10 The counter readings should be as shown in the table Hint Set the Step Freq increment to 1 1 MHz Table 5 10 N1 Loop Output Frequency Checks Center Frequency Counter Readout 29 700000 MHz 28 600000 MHz 27 500000 MHz 26 400000 MHz 25 300000 MHz 24 200000 MHz 23 100000 MHz 22 000000 MHz 20 900000 MHz 19 800000 MHz NOTE The adjustments shown in Table 5 10 should be made with the counter time base connected to the synthesizer REFERENCE OUTPUT Adjustment 7 Mode 8660D Adjustments Adjustment 8 N2 PHASE LOCK LOOP e Service Sheets 9 and 10 Description The N2 phase lock loop produces digitally controlled RF signals from 19 80 to 29 79 MHz in 10 kHz increments The output
63. l oo ooomom o ee eee ee ree eee EEEE 10 dBm Sweep Time Per Division NA 2 ms Adjustment 3 Model 8660D Adjustments FREQUENCY STANDARD o roba o Figure 5 4 100 MHz Adjustment Test Setup 86680 Figure 5 5 RF Level Checks Test Setup Figure 5 6 RF Level Checks Typical Waveform Adjustment3 5 13 Adjustments Model 8660D ASAS OUTPUT A4AB ASSY HP 86680 SPECTRUM ANALYZER OUTPUT Figure 5 7 100 MHz Band pass Filter Adjustment Test Setup j Connect the equipment as shown in Figure 5 7 If necessary readjust the analyzer controls to center the 100 MHz signal on the display o k With a non conducting alignment tool adjust A4A8C1 and C2 for peak output at 100 MHz Set the spectrum analyzer s vertical sensitivity to 2 dB per division or linear Set the Synthesized Signal Generator sweep width to 50 MHz Verify that the flatness is 3 dB for a bandwidth of gt 4 MHz it o p E Check that the insertion loss is lt 1 dB Bypass the 100 MHz Band pass Filter and measure the output directly from the signal source Compare the direct signal with the signal leve through the filter To achieve the 1 dB maximum insertion loss flatness may be compromisec slightly p Reconnect W6 to the A4A8 Assembly Monitor the 100 MHz output level of the of the A4A8 Assembly with the RF voltmeter into 50 q Adjust A4C41 for the maximum output level Verify that t
64. lerks ok venus bs bapa is Fu ok eh anal ea Rees anthem OLD Input ALLSDUACI N Loria ns a le A tc even Gw headwear nese O GD Scan Timo Per DIVISION cositas L MSEC Ref Level iri E a a a a a a a saa m ABM d Adjust A4A6C5 trap for minimum 10 MHz amplitude e Reconnect input to A4A6 f Replace all High Frequency Section Covers Adjustment 6 5 23 Adjustments Model 8660D A4J12 REFERENCE SIGNAL TEE L JO Asui3 CONNECTOR dr SPECTRUM ANALYZER Figure 5 16 10 MHz Trap Adjustment Test Setup 7 Output Frequency and Amplitude Check see Figure 5 17 a Set the HP 8660D CF to 6 MHz b Connect the Spectrum Analyzer RF INPUT to A4J12 Set the analyzer controls as required to view the 450 MHz signal The output should be 13 dBm to 15 dBm To increase or decrease output change resistors A4A5R38 R40 R42 See Table 5 2 for suggested sets of values Ba c Switch digits 9 and 8 from 00 through 10 The frequency should decrease in 10 MHz ste amplitude at 13 dBm minimum 440 MP2 cia Brm 430 MHz dBm 420 _dBm 410 MHz Sti dBm 400 MH dBm 39_________dBm 380 MHz dBm 370 MHz__dGBm 360_________dBm 350 MHz Od Bm SPECTRUM ANALYZER Figure 5 17 Output Frequency and Amplitude Check Test Setup 5 24 Adjustment 6 Model 8660D Adjustments Adjustment 7 N1 PHASE LOCK LOOP e Service Sheets 7 and 8 Description The N1 phase lock loop produces digitally controlled RF signals from 19 8 to 29 7 MHz
65. lug In Section is not used it will be necessary to have an HP 86631B Auxiliary Section in place of the Modulation Section The Auxiliary Section completes a signal path from the mainframe to the RF Section Plug In and also provides a means of modulating the RF Section from an external source 3 2 PANEL FEATURES gt Front and rear panel controls indicators and connectors of the HP 8660D are shown in Figure 3 1 i and their functions are described in the following table 1 SINGLE SWEEP key in the SINGLE mode when pressed causes the RF output to be swept one time only across the range stored in the sweep TOS at a speed determined by the sweep RATE key OUTPUT 0 to 8V Provides a sweep ramp for use in external equipment oscilloscopes X Y recorders etc when operating in the swept mode SWEEP RATE key Selects sweep rates as follows FAST 100 steps at 1 millisecond per step MED 1000 steps at 1 millisecond per step and SLOW 1000 steps at 50 milliseconds per step functional only when in Single or Auto Sweep modes POWER STBY ON switch in the STBY position with the instrument connected to the ac line source the reference oscillator oven temperature is maintained at the operating temperature to avoid the necessity of allowing for a warm up period each time the instrument is used CENTER FREQUENCY readout Dispiays the output center frequency of the RF Section when a frequenc units annunciator is lit and is
66. ly disconnected from the VCO OUTPUT A4J10 connect the digital voltmeter to the A4A6 Frequency Control output white black violet lead b Adjust the A4A6 0 CONTROL A6A6R18 for a digital voltmeter reading of 34 Vdc voltage should be adjustable from about 33 to 35 Vdc c Connect the frequency counter io the A4A5 voltage controlled oscillator output A4J12 Replace the A4A6 assembly cover d The counter should display 450 MHz 1 MHz If the correct reading is obtained proceed to step f If the frequency reading is not correct proceed to step e e Adjust A4A5C3 for a 450 MHz 1 MHz reading f Disconnect the frequency counter and reconnect the voltage controlled oscillator output to the phase detector 5 20 Adjustment 6 Model 8660D Adjustments DIGITAL VOLTMETER FREQUENCY COUNTER Figure 5 13 Voltage Controlled Oscillator Adjustments Test Setup g Connect the digital voltmeter to the phase error test point Connect the frequency counter to A4J12 350 450 MHz OUTPUT white yellow cable h Set the center frequencies as shown in Table 5 9 and set the digital to analog controls on the A4A6 assembly for 0 0 1 volt for each frequency listed Note that the counter displays the output frequency listed for each center frequency setting NOTE When the 86602 or 86603 is installed in the mainframe the 350 MHz output of the High Frequency Section ts not used When this situation exists the adjus
67. mark the container FRAGILE to assure careful handling In any correspondence refer to the instrument by model number and full serial number Other Packaging The following general instructions should be used for re packaging with commer cially available materials 1 Wrap the instrument in heavy paper or plastic If shipping to a Hewlett Packard office or service center attach a tag indicating the service required return address model number and full serial number 2 Use a strong shipping container A double wall carton made of 2 4 MPa 350 psi test material is adequate 3 Use enough shock absorbing material 75 to 100 mm TAN 3 to 4 in layer around all sides of the instrument to provide firm cushion and prevent movement inside the container Protect the front panel with cardboard 4 Seal the shipping container securely 5 Mark the shipping container FRAGILE to assure careful handling Model 8660D l Operation Section 3 OPERATION 3 1 INTRODUCTION TO THIS SECTION This section provides operating instructions for the Hewlett Packard Model 8660D Synthesized Signal Generator mainframe for both the local and remote modes The Model 8660D is designed to be used with plug in sections that provide the selected output frequency with the chosen modulation parameters Having access to the operating manuals for the plug in sections you are using might make it easier to learn complete instrument operation NOTE If a Modulation P
68. me Per A eaa a es Oe PSR ES RENA re 5 ms Disconnect the reference input to A4J13 10 MHz output from A4A4 and reconnect it together with the RF output of the Signal Generator Sweeper Set the Signal Generator Sweeper to 11 5 MHz CW at 35 dBm and symmetrical sweep width to 3 MHz The analyzer display should be approximately as shown in the typical waveform shown in Figure 5 15 Adjust the A4A6 GAIN control A4A6R2 for the response shown Disconnect the Analyzer and the Generator Sweeper Reconnect the reference signal to A4J13 ASJi2 TEE fa ta rp p ar FROM AsA4 CONNECT TO A6UI3 GENERATOR SWEEPER Figure 5 14 Loop Gain Adjustment Test Setup 5 22 Adjustment 6 Model 8660D Adjustments Figure 5 15 Loop Gain Adjustment Waveform 6 10 MHz Trap Adjustment see Figure 5 16 NOTE This adjustment is necessary only if the A4A6 10 MHz trap has been repaired i a Disconnect the coaxial cable from A4J10 350 450 MHz to detector b Disconnect the 10 MHz reference signal from A4J13 and reconnect it using a TEE connector Connect the 10 MHz reference signal from the other TEE port to the input of the A4A6 assembly white wire from the A4A7 assembly c Connect the Spectrum Analyzer RF INPUT to the A4A6 Frequency control output white black violet wire Set the analyzer controls as follows Center Frequentes dO MHZ Scan Width Per DivisioM cooooooooomooororsraaross 00 KHZ Video Filter c
69. must be in the EXT position The 25 key keyboard may be used to 1 Select any frequency within the range of the RF Section plug in in 1 Hz increments above 1300 MHz 2 Hz increments NOTE When a center frequency is keyed in on the HP 8660D the frequency is displayed and the units GHz MHz kHz Hz annunciator flashes Upon keying in CF the frequency ts accepted or rejected If the entered frequency is above the upper limit of the RF Section plug in being used the readout reverts back to the last valid entry If the frequency being entered is below the minimum frequency limit the frequency is displayed but the RANGE annunciator comes on indicating that the output amplitude may be degraded 2 When frequencies below the RF Section frequency range are selected the RANGE lamp lights 3 Select any desired sweep width within the frequency range of the RF Section in use 4 Select any incremental step within the frequency range of the RF Section in use Sweep Functions 3 4 The sweep width is selected by entering a frequency then pressing SWEEP WIDTH The sweep width may be displayed on the CENTER ERE ENCS readout by pressing the blue SHIFT key and then the SWEEP WIDTH key When the SWEEP MODE key is in the AUTO mode the output signal of the RF Section is swept about the selected center frequency by the selected sweep width Example With the center frequency at 50 MHz and the sweep width at 20 MHz the RF output is swept
70. n reference loop 20 MHz The HP 866328 and the HP 86635A require inputs of one half of the desired deviation in remote mode EXAMPLE 1 Set 100 000000 MHz Center Frequency CF input 0 High 1 Low Temporary Register CF Register Data D 0001 1 Da 0000 0 00 00 00 00 00 01 00 00 00 00 01 00 00 00 00 00 00 00 00 00 Last Input Temporary Command Address D 1111 15 Da 0000 0 Last Input Last Input 01 00 00 00 00 Transfer Command 3 20 Model 8660D Operation For a detailed description of the Hewlett Packard Interface Bus connector refer to Figure 3 2 For information regarding OLD HP IB programming codes refer to Programming Note HP part number 5953 8391 or the HP 8660 A B or C manuals 3 12 BCD REMOTE OPERATION NOTE The following information pertaining to BCD programming does not apply to HP IB programming There are several conventions which must be observed when remotely controlling the 8660D using BCD code Besides providing data with the least significant digit first these conventions include 1 All output levels are referenced to 13 apm This reference operation involves subtracting 13 from the desired output level 2 There are three separate modulation parameters which may be programmed source type and Source and type are combined into one number source is the least significant digit 3 When in the remote mode all front panel controls except the
71. not flashing ANNUNCIATORS Provide a visual display of mode of operation crystal oven temperature and out of range frequency selection A frequency display annunciator flashes if a frequency value is not transferred to a register by pressing CF Sweep Width or Step TUNING Works as specified in the MANUAL MODE descriptions May also be used to set the RF output to any point within the limits stored in the sweep register when the SWEEP MODE key is set to MANUAL 7 3 1 Operation Model 8660D MANUAL MODE Works in conjunction with the TUNING control to step the RF output in steps of 1 Hz FINE 1 kHz MED and 1 MHz COARSE In the STEP position the TUNING control steps the RF output frequency by the step stored in the instrument DATA KEYS Contains 20 keys which are used to enter data or instructions as follows Numerais O through 9 Decimal Point lt u Clears last data entry GHz MHz kHz and Hz select frequency in conjunction with numeric keys CF transfers keyboard storage register data to the center frequency register ft transfers keyboard storage register data to the step register or steps the center frequency up when keyboard data is not present on the display Same as ff except that frequency is stepped down SWEEP WIDTH transfers keyboard storage register data to sweep register SHIFT Blue SHIFT key lights up amber annunciator when pressed At this time any one of the following shifted functi
72. nts specified in Table 5 6 4 Use the digital voltmeter to adjust each power supply voltage specified in Table 5 7 using the corresponding adjustment Verify that the ripple does not exceed the limits indicated Adjustment 2 5 9 Adjustments Model 86601 5 10 Table 5 6 Unregulated Power Supplies side of A20C7 Typical 3 37V Specified 0 6V Typicai 0 31 side of A20C4 Typical 21V Specified 2 4V Typical 1 1 side of A20C5 Typical 21V Specified 2 4V Typical 1 15 side of A20C1 Typical 33V Specified 4V Typical 1 0 Table 5 7 Regulated Power Supplies Adjust ASTPA ASR24 125 uV 5 25 ADJ ASR26 10 ADJ ASR21 20 ADJ A5R2B 40 ADJ Adjustment 2 Model 8660D Adjustments Adjustment 3 j REFERENCE SECTION e Service Sheets 2 and 3 Description The reference section contains a voltage controlled master oscillator from which all RF signals generated in the HP 8660D mainframe are derived The master oscillator is phase locked to an internal temperature controlled crystal oscillator or to an external standard The reference section provides outputs of 500 MHz 100 MHz 20 MHz 10 MHz 2 MHz 400 kHz and 100 kHz These checks verify proper operation of the circuits within the reference section REFERENCE OSCILLATOR OSCILLOSCOPE FREQUENCY STANDARD OUTPUT VERTICAL TRIGGER INPUT INPUT SB FEEDTHRU TERMINATION Figure 5 3 Reference Accuracy Adjustment Test Setup Test Equ
73. odel 8660D Adjustments Set the HP 8660D center frequency to 0 45 MHz Adjust A19R3 for a counter reading of 29 55 MHz 0 02 MHz The adjustments in steps 5 and 6 are cine Repeat these steps until both weiter readings are within tolerance 8 Remove the jumper from the A2 Motherboard 9 Set the HP 8660D center frequency to 9 45 MHz Connect the voltmeter to A2 Motherbgani 10 11 12 13 14 15 TP14 Adjust A19R9 for a DVM reading of 0 mVde 5 mVdc Connect the oscilloscope to A2 Motherboard TP13 Adjust A15R14 for a square wave with 50 50 symmetry Remove the oscilloscope Set the HP 8660D center frequency to 0 45 MHz Adjust A19R3 for a DVM reading of 0 mVde 100 mVdc at A2 TP14 NOTE The voltage reading will drift immediately after a frequency change Wait until the reading stabilizes before making the adjustment Set the HP 8660D center frequency to 9 45 MHz Adjust A19R9 for a DVM reading of 0 mVde 100 mVdc The adjustments in steps 12 and 13 are interactive Repeat these steps until both DVM readings are within tolerance Set the HP 8660D center frequency to the values given in Table 5 14 At each frequency setting adjust the control listed in the table for a DVM reading of 0 mVde 100 mVdc The frequency counter reading at the test point called SL1 OSC should be as shown in the table Table 5 14 SLI Oscillator Output Frequency Adjustments 8 45 MHz A18R35 8 21 550 MHz 20 kHz 7
74. olarized in many nations 125V 8120 1378 5 Straight NEMA5 15P 80 Black United States 8120 1398 5 90 80 Black Canada Mexico 8120 1754 7 Straight NEMAS 15P 36 Black Japan 100V or 8120 1378 1 Straight NEMA5 15P 80 Jade Gray 200V Philippines 8120 1521 6 90 80 Jade Gray Taiwan 8120 1676 2 Straight NEMAS5 15P 36 Jade Gray 250 V 8120 2104 Straight SEV1011 79 Gray Switzerland i 1959 24507 LES us o E 250V 8120 0698 6 Straight NEMA6 15P United States Canada Lo 2 a a 220V 2 StraighttDHCK107 79 Gray Denmark 3 90 79 Gray 8120 4211 Straight IEC83 B1 South Africa India 8120 1860 Straight CEE22 VI Systems Cabinet Use 8120 1957 8120 2956 yon number shown for plug is industry identifier for plug only Number shown for cable is HP Part Number for complete cable including plug E Earth Ground L Line N Neutral Installation Model 8660D Packaging Tagging for Service If the instrument is being returned to Hewlett Packard for service pleas complete one of the blue repair tags located at the end of this manual and attach it to the instrument 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
75. ons blue key labels can be selected RESET sets instrument to power up state CF 1 MHz Sweep Width 2 MHz Step 5 MHz HP IB Addr 19 or value selected by internal dip switches Sweep Functions Off Manual Step Mode Off ERROR will redisplay error codes 01 05 Refer to Error Codes SET ADRS allows HP iB address 0 30 to be entered into volatile memory Power down or instrument reset will cause the address to revert back to the manually set switch address DISPLAY ADRS displays current HP IB address or BCD if BCD is selected LOCAL allows keyboard entry of data during remote programming returns instrument to the local mode CLEAR KYBD causes display to revert to center frequency DISPLAY f or i displays step size td noia DISPLAY SWEEP WIDTH displays sweep width wie ee SWEEP MODE key With the sweep mode switch in the AUTO position sweep operation is automatic the RF output is swept continuously about the center frequency by the data stored in the sweep register at the rate selected by the SWEEP RATE key In the SINGLE mode the RF output is swept once each time the SINGLE key is pressed in the MANUAL mode the sweep is controlled by the MANUAL TUNE control and the data stored in the sweep register LINE MODULE Contains a means of switching input line voltage to 100 120 220 240 Vac 5 10 fuse tine cable connector and filtering NOTE The cabinet earth ground is also applied through the line moduie R
76. ours then _ z i cyce 1 l 24hrs j _ 11 Aging Rate z MHz Car 349s 3hrs 1 306 x 10 7 Enter calculated Aging Rate in Table 4 1 4 3 Performance Tests Model 8660D Performance Test 2 REFERENCE TEST Specifications At 5 or 10 MHz from 0 75 to 1 5 Vrms into 170 ohms Description This test verifies proper operation of the reference amplifier and relay switching circuits Equipment RE VOM A NA Cabal nies says HP 3400A TEE CONNECTOR REF OUT Y Lt HP 86680 enna a iss cesses RF VOLTMETER orslcooco r oc posed lo 0 o o Figure 4 2 Internal Reference Test Setup Procedure 1 Connect the RMS Voltmeter to the REFERENCE OUTPUT rear panel jack and set the SELECTOR switch rear panel to the INT position 2 The RF Voltmeter should display a voltage from 0 75 to 1 5 Vrms 3 Enter measured voltage in Table 4 1 4 4 Model 8660D Performance Tests Performance Test 3 PHASE LOCKED LOOPS T TEST Specifications N1 N2 N3 SL1 and SL2 Loop error voltages must be 0V 500 mVde HF Loop error voltage must be OV 100 mVdc Description The Phase Locked Loops Test does not verify any instrument specifications The purpose of this test is to determine if the error voltages for the phase locked loops require adjustment If the loops do not meet the limits of this test then perform the abbreviated adjustment procedure adjustment 1 for the Phase Locked Loops The H
77. p left corner Push the card firmly into the slot 3 Rotate the FUSE PULL lever to its norma position Insert a fuse of the correct value in the holder Close the cover door A ee Figure 2 1 Line Voltage and Fuse Selection Operating Environment The operating environment should be within the following limitations Temperature eer ee eon Mere rere eee ere cee P EEE E 0 C to 55 C Humidity osan Rd E tek AS AS lt 95 relative Altitudes esea REE TEES lt 4600 meters 15 000 feet Clearances for airflow around the instrument should be as follows 7 6 cm 3 in minimum clearance at the rear of the instrument and 2 5 cm 1 in minimum clearance on each side The clearances provided by the plastic feet in bench stacking and the filler strip in rack mounting are adequate for the top and bottom cabinet surfaces Remote Selection The HP 8660D is factory configured for BCD programming or HP IB programming address 19 if option 005 is specified If you are not sure what configuration the instrument is in turn power on and press blue shift 3 display address Either the letters bed or the HP IB address will be displayed 2 3 Installation Model 8660D The HP IB address can be changed through front panel operation see section 3 but upon power on or reset conditions it will always revert to the hardware setting on rocker switches found within the DCU module The following procedure will allow you to change the HP IB addr
78. perator CHECKE meli ar OEA y aoe es A A bag B hee 3 5 tal Tur On Cheles sa da Sd ee ise ewe AAC a Sd A 3 5 Keyboard Register and Readout Checks 0 0 ee ee ee eens 3 6 Step f Y and RANGE Annunciator Check Using the HP 86601 RF Section 3 6 Volume 1 Contents Mode 8660D Section 3 Operation cont d Operator s Checks cont d STEP 1 y Register and RANGE Annunciator Check with the HP 86602A RF Section 3 7 STEP ft Y Register and RANGE Annunciator Check with the HP 86603A RF Section 3 8 Manual Mode Manual Tuning Check With 86601A A Bok Bes 3 8 Sweep Mode Checks with 86601A RF Section o ee eee 1 3 9 Sweep Mode Checks with 86602A 86602B or 86603A RF Sections lt lt 3 9 Manual Sweep Check 65 5 3 4 5 8 426 Wa a re Aa ee A r 3 10 Single Sweep Check o 0 Mea A ate A EA AN E AE E ar a Ba 3 10 Modulation Plug ins cito eer Se anemone N erg ee BOM ee 3 10 Eror Codae e306 ko 8 694 a Ge oad AE ie bhai Se VARAS ee 3 10 HP IB Programming OLD and NEW Codes Explained 2 2 0 ee ee ee ee 3 10 Signal Generator Function to NEW HP IB Codes o lt E AR RS 3 12 HP IB Capablanca e ee ae AA AA A AA ATA TI a a are 3 13 Example Program aac a SR Se ret Bae AO a O AN Qe ata oe Re 3 14 BP IB Address Selection 10 aos eS hw ek Sees ee A Swe Bae CR a eee 3 16 Further HP IB Programming Inform
79. phase locked loops which are most likely to change due to aging or temperature effects and thus require periodic attention This procedure can only be used if a phase locked loop is locked If it is not the full adjustment procedure should be performed OSCILLOSCOPE Figure 5 1 Abbreviated Phase Locked Loops Test Setup Test Equipment Oscilloscope with 10 1 divider probes 0 00 0 66 c sees cece cence tr HP 54200A Procedure NOTE Set the HP 8660D Line switch to ON and allow the instrument to warm up with the covers on for at least six hours before starting the measurements The warm up period is required to stabilize the internal temperature 1 Set up the test equipment as shown in Figure 5 1 2 Adjust the oscilloscope as follows l VOLTS DIV ura dia 0 01V Actually 0 1V since 10 1 probes are used PING OEY ovens rots be SAS EAN ART OOM wea al tale eet RIE Dee e 10 us MODE ia pear Sethe AS aN ae ad ieee thins di eae Sores Raye a DC COUPLED GROUND POSITION ones iaa esa CENTER OF DISPLAY a E Adjustment 1 5 5 Adjustments Model 8660D NOTE Ali of the test points except for the HF loop are located on the A2 Motherboard Access to these test points is obtained by raising the A4 assembly and locking it in the up position see Figure 5 1 Figure 5 23 shows the approximate location of all test points The reference designators of the test points are etched on the pc board Access to TP3 and TP8 is difficult because they are und
80. pulses are logic 1 OV pulses of 100 nanoseconds minimum width maximum frequency of 500 kHz Pulses for low transfer frequencies may be wider if consistent with the duty cycle The trailing edge must have a rise time of 100 nanoseconds or less Transfer occurs on the trailing edge of the pulse Note that data must be held until the command pulse terminates The flag signal is also initiated by the falling leading edge of the command pulse Fiag Signal The flag signal indicates receipt and execution of the command pulse from the remote programming device The flag signal will be logic 1 OV Duration of the signal will depend on the function programmed Reset Controls the DCU circuits in the same manner as a front panel reset Requires a logic 1 OV level which may be as short as 5 microseconds Table 3 4 Storage Register Addresses Address ae Functi Name of Register O High 1 Low ocation nection Center Frequency 0000 0 Mainframe To Set Frequency Step f 0001 1 To step center frequency up in any increment 4 Step 0010 2 Mainframe DCU To step center frequency down in any increment Attenuator 0011 3 RF Section plug in Controls level of RF OUTPUT AM FM Function 0100 4 Modulation Section Selects Modulation Function plug in AM FM 0101 5 Modulation Section Selects AM of Modulation or FM Deviation plug in FM CAL 86632 or 0110 6 Modulation Section Phase locks 20 MHz FM oscillator to the 86635 only plug i
81. rary Command Data D 0000 0 Dz 0000 0 Last input Last Input Temporary Command Address D 1111 15 Da 0011 3 Last Input Last input 007 Transfer Command NOTE The attenuator is a three digit register only the three most significant digits are retained 3 21 Operation Model 8660D EXAMPLE 5 Shut off Modulation MODULATION SECTION Input 0 High 1 Low Temporary Register Address D 1111 15 D 0100 4 00 00 00 00 00 00 00 00 00 00 CF Register Last Input 000 Transter Command NOTE All digits are zero no modulation EXAMPLE 6 Set 3 AM Modulation Internal 1 kHz MODULATION SECTION input 0 High 1 Low Temporary Register CF Register Data D 0011 3 Da 0000 0 Temporary Command Address D 1111 15 Da 0101 5 00 00 00 00 00 03 00 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 81 00 00 00 00 81 00 00 00 00 00 00 00 00 00 Last Input Last Input Last Input Transfer Command Data D 0001 2 Da 1000 8 03 into Storage Temporary Command Address D 1111 15 Dz 0100 4 Transfer Command 81 into AM FM Function Register Sets AM and 1 kHz NOTE See Table 3 5 for AM FM Function Register Codes EXAMPLE 7 Set 10 MHz STEP 4 Input 0 High 1 Low Temporary Register CF Register Data D 0000 0 D 0001 1 00 00 00 00 00 Temporary Command 10 00 00 00 00 Data D 000
82. rd Interface Bus system is 20 metres 65 6 ft l Figure 3 2 Hewlett Packard Interface Bus Connection 3 18 Model 8660D Operation EXAMPLE 2 Set 107 654321 MHz Center input 0 High 1 Low Temporary Register CF Register Data D 0001 1 Dz 0010 2 00 00 00 00 00 Last Input Temporary Command 21 00 00 00 00 Last input Data D 0011 3 Da 0100 4 21 00 00 00 00 Last input Temporary Command 43 21 00 00 00 Last Input Data D 0101 5 Dz 0110 6 43 21 00 00 00 Last input Temporary Command 65 43 21 00 00 Last input Data D 0111 7 Dz 0000 0 65 43 21 00 00 Last Input Temporary Command gt 07 65 43 21 00 Last input Data D 1111 15 D 0000 0 01 07 65 43 21 Last Input Temporary Command 00 00 00 00 00 01 07 65 43 21 EXAMPLE 3 Set 120 dB Attenuation RF SECTION Below 13 dBm 1 volt input 0 High 1 Low Temporary Register CF Register Data D 0010 2 Da 0001 1 00 00 00 00 00 Last input Temporary Command 12 00 00 00 00 Last input Address D 1111 15 Dy 0011 3 12 00 00 00 00 Last Input Transter Command 00 00 00 00 00 120 NOTE The attenuator is a three digit register only the three most significant digits are retained EXAMPLE 4 Set 7 dB Attenuation RF SECTION Below 13 dBm 1 volt input 0 High 1 Low Temporary Register CF Register Data D 0000 0 D 0111 7 00 00 00 00 00 70 00 00 00 00 70 00 00 00 00 00 70 00 00 00 00 70 00 00 00 00 00 00 00 00 Last input Tempo
83. red against any unintended operation NOTE When repairs or adjustments to the instrument are required such work should not be performed even by a skilled technician unless another person is in the same general area This is not to be interpreted to mean that two persons are required to perform the necessary work but only that another person should be available should the need for assistance arise In Adjustments 1 12 it is assumed that a At the start of the test the output frequency is set to 0 b An RF Section output plug in section must be in place during the tests c A Modulator Section or an Auxiliary Section must be in place in the modulator compartment d All tests in which a counter is used should be made with the HP 8660D and the counter referenced to the same source The HP 8660D internal reference may be used as the source Table 5 2 Factory Selected Components 1 of 2 A4A2011 A variable 10 MHz signal at 45 dB is connected in paralle with the 10 MHz reference signal to A4J5 The frequency is varied to show the 3 dB points The capacitor is selected for the reference loop 3 dB bandwidth of 60 to 160 kHz 30 to 80 kHz measured at the 100 MHz output ASA2R42 To achieve correct phase error signal level 100 to 422 ohms A4A4C010 Reference VCO To set reference loop bandwidth and capture range 10 to 56 pF interacts with A4A2C11 A4A4L12 Reference To control output level of 100 MHz 0 34 to 1 0 uH Loop A4A4Q7 Re
84. ress can be changed or the programming format can be changed by moving the blue jumper to J3 for HP IB or to J4 for BCD Rack Mounting Option 908 Rack mounting information is provided with the rack mounting kit If the kit was not ordered with the instrument as an option it may be ordered through the nearest Hewlett Packard office For rack mount kit part numbers refer to paragraph 1 8 Options Available with the Instrument 2 4 STORAGE AND SHIPMENT 2 4 Environment The instrument should be stored in a clean dry environment The following environmental limitations apply to both storage and shipment Temperate E eel eee Nagas CARS A OTe ASIA 40 C to 75 C Humidity dt Bicone ent Cain dine Megha EAO O how Soro vag IAS eM ave lt 95 relative Altitudes srera cw ea ea eat Dt E ar STO eae dan ND lt 7600 meters 25 000 feet Model 8660D Installation Table 2 1 AC Power Cables Available o Cable Cable 0 Plug Cable For Use Plug Type cee Gj Description inches Color In Country 90 Straight BS1363A 90 8120 1351 Mint Gray 8120 1703 Mint Gray United Kingdom Cyprus Nigeria Rhodesia Singapore 250V eQ L N m e 250V 8120 1369 Straight NZSS198 ASC112 79 Austrailia 8120 0696 90 87 Gray New Zealand OV 8120 1689 7 Straight CEE7 Y11 79 Mint Gray East and West 8120 1692 2 90 79 Mint Gray Europe Saudi Arabia Egypt unp
85. ro HP 3325A Procedure 1 Set up test equipment as shown in Figure 5 11 a Disconnect the coaxial cable from VCO INPUT A4J11 Connect the PULSE OUTPUT of the pulse generator to A4J11 Set the pulse generator for 100 kHz pulse rate 0 035 psec pulse width 0 5 volt amplitude and polarity Adjustment 6 5 19 Adjustments Model 8660D b Remove the cover of the A4A6 assembly Connect the spectrum analyzer RF INPUT to the test point marked 6 on the A4A6 assembly This test point should have a white wire and a resistor soldered to it Set the analyzer controls as follows Center Frequency O AY 5 MHz Scan Width Per DIVISION scossi cmime ae sd el Made d oie e Oe ee lee oe 1 MHz Scan Time Per Division lead pii as ss i ms Gain and A A dds Vea daw eeate c aaa Tate ia sy eee sawene dee as required c Adjust efficiency control A4A7R18 for a flat response to approximately 5 MHz with very slight peaking 1 dB 1 dB See the waveform in Figure 5 12 for typical response d Disconnect the pulse generator and the spectrum analyzer Figure 5 12 Phase Detector Response Waveform a NA 3 Balance Adjustment a Connect the digital voltmeter to phase error TP b Adjust the BALance control A4A7R22 for a digital voltmeter reading of 0 volts 0 05 volt Disconnect the digital voltmeter 4 Voltage Controlled Oscillator Adjustment see Figure 5 13 a Remove the A4A6 cover With the output cable of the A4A5 assemb
86. s loves o o o o EXT TIMEBASE INPUT Figure 5 20 N3 Loop Test Setup Test Equipment Digital Vo l ase HP 3478A PEGUEN EY Counter ala EA a paws alee a acti E HP 53854 NOTE The A2 Motherboard test points used in this procedure are covered up by the HP 8660D DCU To access these test points remove the 4 screws holding the DCU to the chassis and slide it forward Refer to the Remote Selection procedure in Section 2 if needed Procedure 1 Set up test equipment as shown in Figure 5 20 2 Set the HP 8660D center frequency to 95 Hz Ground A2TP4 on the A2 Motherboard with one of the jumpers provided 3 Connect the frequency counter to the A2 Motherboard test point labeled N3 OSC which is adjacent to XA8 1 pin 7 The other test point labeled N3 OSC is the VCO output after the frequency is divided by 10 Adjust A8R26 for a counter reading of 20 05 0 02 MHz 4 Set the HP 8660D center frequency to 5 Hz Adjust A8R24 for a counter reading of 20 95 0 02 MHz Adjustment 9 5 29 Adjustments 5 30 Model 8660D The adjustments in steps 3 and 4 are interactive Repeat these adjustments until both counter readings are within tolerance Connect the voltmeter to A2 Motherboard TP3 7 Remove the ground from A2 TP4 10 11 Set the HP 8660D center frequency to 95 Hz The counter reading should be 20 050000 MHz Adjust A8R26 for a DVM reading of OV 100 mVdc Set the HP 8660D center frequency to 5 H
87. s iaa A A A A AAA a 1 3 Equipment Av ilable rare ra AA e A AR Y A A ARA 1 3 How to Use the Recommended Test Equipment Table oo o 1 6 Section 2 Installation Introduction to This Section o dd ia 2 1 Anitial Inspection we Sa he SS ee re ee ee E se Rows 2 1 Preparation for Use oua e E A AS ee RAT ER eS Oke Oe dee Shae Sem 2 1 Power Requirements Bu Ss SF ae AR Webi Shik TED O Se poke A Re a a ee beeen cee ad 2 1 Line Voltage Selection ss brisa eee ere WALA ew ARES EU Se ee ae 2 1 Power Cables pisos lts BER we bd A eee oe Bd la Ge GAR ee Peale we wee See 2 2 Operating Environment ia AAA ASA O Be Si Rac wpe 2 3 Remote Selection owi aah ci Vd oe BSA A Ae hw EE ROR SSO Oe Pod eS 2 3 Rack Mounting Option 908 lt lt ss 4 640 42k Rok a A REA E TARA Sid 2 4 Storage and Shipment iv jun DIA EAS AAA AAA da a a 2 4 Environment cr ds e a E SEA a Sh eS eee RIA Os 2 4 Packaging A E AAA ASIA 2 6 Section 3 Operation Introduction to This Section c o Da A AA A A A AAA A Gre 3 1 Panel Features eee he a dine A A ae lad AA a AO ere ee 3 1 Operator s Maintenance o i ai la ee ES A RAR oe ee a A perating Principles tid Wee Soe es RA AAA DAA LAIA Se 3 4 Local Operation a a ele ia fe ae ot he ee Ge one ee a A a ka AS ARA e 84 Sweep Functions S44 bie ek wee oe ae AAN ed tate om es Pe 3 4 Manual Tuning saa o 6 9 Sw Se werd fe al ech Ge the PE ios cae tases ea eae E E E ah 8 3 5 O
88. t the HP 8660D center frequency to 95 5 kHz The frequency counter reading should be 20 240000 MHz Adjust A13R37 for a DVM reading of OV 100 mVdc 11 Set the HP 8660D center frequency to 5 5 kHz The frequency counter reading should be 29 240000 MHz Adjust A13R39 for a DVM reading of OV 100 mVdc 11 The adjustments in steps 10 and 11 are interactive Repeat these steps until the DVM reading is within tolerance at both frequency settings 12 Set center frequency as shown in Table 5 11 The counter readings should be as shown in the table Hint Set the Step Freq increment to 11 1 kHz Adjustment 8 Table 5 11 N2 Loop Output Frequency Checks Center Frequency Counter Readout N2 0 29 790000 MHz 11 1 kHz 28 680000 MHz 22 2 kHz 27 570000 MHz 33 3 kHz 26 460000 MHz 44 4 kHz 25 350000 MHz 55 5 kHz 24 240000 MHz 66 6 kHz 23 130000 MHz 77 7 khz 22 020000 MHz 88 8 kHz 20 910000 MHz 99 9 kHz 19 800000 MHz Model 8660D Model 8660D Adjustments Adjustment 9 N3 PHASE LOCK LOOP e Service Sheets 11 and 12 Description The N3 phase lock loop produces digitally controlled RF signals from 2 001 to 2 100 MHz in 1 kHz increments The output frequency is controlled by changing the 1 Hz and 10 Hz digits of the display The following procedure adjusts the pretuning circuitry of the loop DIGITAL VOLTMETER HP 86680 __ ASE OUTPUT En FREQUENCY COUNTER lo closoo
89. the HP 8660D mainframe is used Refer to Figure 3 3 for timing information and to Table 3 6 for interconnection information NOTE Although it is not necessary to program frequency first then modulation if any then attenuation this sequence minimizes the time required for entering data 3 17 Operation Model 8660D SIGNAL GROUND SHIELD CONNECT TO P O TWISTED PAIR WITH 11 ATN EARTH P O TWISTED PAIR WITH 10 SRO GROUND SHOULD BE GROUNDED P O TWISTED PAIR WITH 9 IFC NEAR TERMINATION P O TWISTED PAIR WITH 8 NDAC OF OTHER WIRE OF P O TWISTED PAIR WITH 7 NRFD TWISTED PAIR P O TWISTED PAIR WITH 6 DAV REN EO DIO 8 1 DIO 4 DIO 7 i DIO 3 DIO 6 DIO 2 DIO DIO 1 ISOMETRIC THREAD M3 5 x 0 6 24 PIN MICRO RIBBON SERIES 57 CONNECTOR Logic Levels The Hewlett Packard interface Bus logic levels are TTL compatible i e the true 1 state is 0 0 Vde to 0 4 Vde and the false 0 state is 2 5 Vde to 5 Vde Programming and Output Data Format Refer to Section lll Operation Mating Connector HP 1251 0293 Ampheno 57 30240 Mating Cables Available HP 10631A 1 metre 3 3 ft HP 10631B 2 metres 6 6 ft HP 10631C 4 metres 13 2 ft HP 10631D 0 5 metres 1 6 ft Cabling Restrictions 1 A Hewlett Packard interface Bus system may contain no more than 2 metres 6 6 tt of connecting cable per instrument l 2 The maximum accumulative length of connecting cable for any Hewlett Packa
90. the knob are programmable with the same accuracy and resolution as in manual mode General Information Model 8660D 4 11 HOW TO USE THE RECOMMENDED TEST EQUIPMENT TABLE Table 1 2 lists the test equipment and accessories required to test adjust and service the Signal Generator The minimum specifications column describes the essential requirements for each piece of test equipment Other equipment can be substituted if it meets or exceeds these minimum specifications Table 1 2 Recommended Test Equipment and Accessories List 1 of 2 ftom O Minimum Specifications Suggested Modei User Digital Voltmeter Voltage Accuracy 0 02 HP 3478A A S 0 000V to 40 Vdc 1 pV Sensitivity HP 3466A A 0 05 of reading 3 uV accuracy General Radio W4MT3A HP 5065A ea PA HP 54200A PAS i AC RMS Voltmeter Variable Voltage Transformer Range 103 to 127 Vac Meter range 103 127 Vac 1V Frequency Standard Oscilloscope 10 1 Divider Probes 10 1 Divider 10 Megohm 10 pF HP 10014A 2 Spectrum Analyzer Frequency Range 0 1 to 500 MHz HP 8590A Frequency Counter Range 10 Hz to 500 MHz HP 5385A 1 Hz Resolution Frequency 10 MHz Long Term Stability lt 1 x 109 24 hours Frequency de to 50 MHz Time base 10 ns to 1s Time base accuracy 3 External Time Base Input Pulse Rate 100 kHz Pulse width 0 035 usec Amplitude 0 5V Potarity Selectable Pulse Generator HP BOTTA
91. tment procedure for A4A6R15 10 is not valid and the following procedure should be substituted 1 Ground the collector of ASA6Q1 2 Adjust A4A6R15 10 for 350 MHz 3 Remove the ground from the collector of A446Q1 X e Table 5 9 Pretune Adjustments Center Frequency Adjust Control 0 MHz A4AGR13 0 450 000000 MHz 10 MHz A4A6R60 1 440 000000 MHz 20 MHz A4A6R56 2 430 000000 MHz 30 MHz A4A6R52 3 420 000000 MHz 40 MHz A4A6R48 4 410 000000 MHz 50 MHz A4AGR44 5 400 000000 MHz 60 MHz A4A6R40 6 390 000000 MHz 70 MHz A4A6R35 7 380 000000 MHz 80 MHz A4AGR28 8 370 000000 MHz 90 MHz A4A6R22 9 360 000000 MHz 100 MHz A4AGR15 10 350 000000 MHz Adjustment 6 5 21 Adjustments i Model 8660D NOTE The adjustments shown in Table 5 9 should be made with the counter time base connected to the synthesizer REFERENCE OUTPUT If any of the controls listed in Table 5 9 cannot be adjusted to 0 volts adjust A4A6R20 profile to obtain additional range Repeat al pretune adjustments until satisfactory results are obtained Disconnect the digital voltmeter and the frequency counter 5 Loop Gain Adjustment see Figure 5 14 a oO With the center frequency set to 0 MHz connect the Spectrum Analyzer RF INPUT to A4J12 350 450 MHz OUTPUT and set the analyzer controls as follows Center PTEQUE ati ate 450 MHz Bandwidth A A SAS ew ese 30 kHz Scan Width Per Division ii A A is 0 5 MHz Scan Ti
92. tment tool Adjust A22A1R2 for an RF Voltmeter reading of 270 mVrms Set the Reference Synthesizer to 10 000700 MHz record RF Voltmeter reading in dBm Set the Reference Synthesizer to 0 999300 MHz record RF Voltmeter reading in dBm Establish the higher of the power levels in steps 6 and 7 as a reference Reset the Reference Synthesizer to 10 000000 MHz Adjust A22A1R6 for a voltmeter reading 20 dBm above the reference Example Reference level 18 dBm 420 dBm _ 2 dBm Reinstall the A22 Assembly 10 Perform Adjustment 5 10 MHz Bandpass Filter Adjustment Adjustment 4 5 17 Adjustments Mode 8660D Adjustment 5 10 MHZ BANDPASS FILTER ADJUSTMENT Description The A22A1 sub assembly is adjusted to the internal 10 MHz reference frequency The assembly level is adjusted for 270 mV into 50 ohms Test Equipment RE Voltmeter a rs des DE re eter ae HP 3400A 60 ohm Feedthrough Termination coria AAA ohh HP 10100C RF VOLTMETER S R FEEDTHRU TERMINATION Figure 5 10 A22A1 Adjustment Test Setup NOTE Adjustment of the Reference Section Adjustment 3 is recommended before performing this procedure Procedure 1 Set up test equipment as shown in Figure 5 10 2 Remove HP 8660D left side cover and top cover Turn power ON and allow HP 8660D to operate for 2 hours to ensure reference stability Set INT EXT reference switch to INT 3 Remove 10 MHz Reference input cable from A4J5 Connect the ca
93. to 1 000000 MHz 7 Press STEP key The RANGE light should come on STEP y Register and RANGE Annunciator Check with the 86603A RF Section 1 Enter 2500 MHz CF on the keyboard The display should read 2 500000000 GHz 2 Enter 11 111111 MHz STEP 4 on the keyboard The display should read 2 500000000 GHz 3 Press STEP f until the readout displays 2 599999998 GHz NOTE The frequency increase alternates between 11 111110 and 11 111112 MHz due to the 2 Hz resolution of center frequencies gt 1300 MHz 4 Press the STEP f key one more time The display should read 2 599999998 MHz and the RANGE light should flash once 5 Repeatedly press the manual MODE key until manual tuning is in STEP mode Turn the TUNING CONTROL counterclockwise The readout decrease is in 11 111110 or 11 111112 MHz steps down to 1300 MHS When the frequency gets below 1300 MHz it will decrease in 11 1111111 MHz steps down to a minimum of 25 Hz 6 Enter 1 MHz CF on the keyboard Enter 1 Hz STEP on the keyboard The display should read 1 000000 MHz 7 Press the STEP Y key The display should read 999 999 kHz and the RANGE light should stay on Manual Mode Manual Tuning Check With 86601A NOTE The upper frequency limit for 86602A B RF Section is 129 999999 MHz for 86603A 2599 999998 MHz 1 Set SWEEP MODE off no annunciators lit and enter 0 MHz CF Display should read 0 Hz and RANGE light is on 2 Repeatedly press the manual MODE key
94. to 19 at the factory in both internal memory Refer to Remote Selection in Section 2 for information regarding changing the HP IB address 1 6 ACCESSORIES SUPPLIED WITH THE 8660D e A detachable three wire power cable The type of power cord will be determined by the shipment destination For the part numbers of the power cables refer to Table 2 1 AC Power Cables Available Signal Generators shipped to countries using 115 volts are also supplied with a set of fuses for 230 volt operation e An accessory kit 08660 60417 consisting of the following al Connector Type N to BNC 1250 0780 1 Extender Board 20 contact 5060 0256 1 Extender Board 24 contact 5060 0258 2 Extender Boards 30 contact 5060 0276 1 Connector 36 pin with hood and clamp 1251 0084 2 Extenders 08660 60406 1 Extender 08660 90102 A BCD to HP IB Adapter HP Part Number 08660 60187 attached to rear panel 1 7 EQUIPMENT REQUIRED BUT NOT SUPPLIED 1 2 An RF Section and Modulation or Auxiliary Section must be installed in the HP 8660D mainframe In addition when an RF section such as the HP 86602 or HP 86603 is used the internal Frequency Extension Module HP 11661 must be used Model 8660D General Information 1 8 OPTIONS AVAILABLE WITH THE INSTRUMENT Electrical Options Option 001 3x10 24 hours internal oscillator Standard Option 003 Operation from 48 to 440 Hz line Standard Option 005 Factory configured for HP IB Operation NOTE To conne
95. ulation selected Enter desired FM deviation DISP Enter FM deviation in kHz INPUT Modulation GOSUB Set_mod_source GOSUB Set_fm_dev RETURN Phasen Phase modulation selected Enter desired Phase deviation DISP Enter phase deviation in degrees INPUT Modulation GOSUB Set_mod_source GOSUB Set_pm_dev RETURN 1 Stop pgm STOP Set_mod_ source Enter the type of modulation source desired f internal 1000 Hz internal 400 Hz external DC external AC or external AC unleveled Input Mod_source 0 Enter_source DISP Enter Source 11000 1400 EDC EAC EACU INPUT Input IF Input 1 000 THEN Mod_source 1 IF Input 1400 THEN Mod_source 2 IF Input EDC THEN Mod_source 4 IF Input EAC THEN Mod_source 8 IF Input EACU THEN Mod_source 9 IF Mod_source 0 THEN GOTO Enter_source RETURN t Set_step_ size t Input and program frequency step size DISP Enter step size in MHz i INPUT Step_size OUTPUT 719 IS Step_size Mz RETURN Step_up t Program frequency step up OUTPUT 719 UP 3 15 Operation 1210 1220 1230 1240 1250 1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370 1380 1390 1400 1410 1420 1430 1440 1450 1460 Model 8660D RETURN Step_down Program frequency step down OUTPUT 719 DN RETURN Set_center_freq Output programmed center frequency to the 8660 OUTPUT 719 FR Center_freq Mz RETURN t Set_rf_lev
96. z The counter reading should be 20 950000 MHz Adjust A8R24 for a DVM reading of OV 100 mVdc The adjustments in steps 8 and 9 are interactive Repeat these steps until the DVM reading is within tolerance at both frequency settings Set center frequencies as shown in Table 5 12 The counter readings should be as shown in the table Table 5 12 N3 Oscillator Output Frequency Checks Center Frequency Counter Readout 21 000000 MHz 20 890000 MHz 20 780000 MHz 20 670000 MHz 20 560000 MHz 20 450000 MHz 20 340000 MHz 20 230000 MHz 20 120000 MHz 20 010000 MHz Adjustment 9 Model 8660D Adjustments Adjustment 10 SUMMING LOOP 2 SL2 e Service Sheets 13 and 14 Description SL2 is a phase lock loop that provides a digitally controlled RF output to Summing Loop 1 This output which is from 20 0001 to 30 000 MHz in 100 Hz steps is controlled by changing the frequency of the N2 and N3 phase locked loops The following procedure adjusts the pretuning circuitry of the loop OSCILLOSCOPE VERT IN RF TEST POINTS DIGITAL VOLTMETER HP 86680 Hp aaa so enemas i 2 al 0 rE 0 FREQUENCY COUNTER o wr E T ae OOO INPUT o olo oono o 8 o o EXT TIMEBASE INPUT Figure 5 21 SL2 Test Setup Test Equipment Digital Volmetenaipraleis licita dia IN HP 3478A Frequentes Counter o cesia venie S EAEEREN ie RERUN we ema os HP 5385A Oscilloscope 10 1 divider probes 0 cee eee ee ee
97. z therefore the RANGE light should stay on NOTE The Model 866014 RF Section lower frequency limit is specified at 10 kHz The output frequency is accurate down to 1 Hz and the output power level is typically accurate down to 3 kHz or less However the output sena should be considered unusable below 1 5 kHz Enter 3 kHz CF on the keyboard The display should read 3 000 kHz the RANGE light should be on Enter 100 Hz STEP J The display should read 3 000 kHz Repeatedly press the STEP key Note that the CF readout decreased in 100 Hz steps The RF output level will typically start to drop when the frequency drops below 2 kHz Also the RANGE light will remain on STEP 4 Register and RANGE Annunciator Check with the 86602A RF Section L Enter 1200 MHz CF on the keyboard The display should read 1 200000000 GHz Enter 11 111111 MHz STEP f 2 Press STEP f until display reads 1 299999999 MHz 3 Press the STEP f key one more time The display should read 1 299999999 GHz and the RANGE light should flash once 4 Repeatedly press the manual MODE key until manual tuning is in STEP mode and turn the TUNING CONTROL counterclockwise The readout should decrease in 11 111111 MHz steps 3 7 Operation Model 8660D 5 Enter 1 MHz CF on the keyboard The display should read 1 000000 MHz 6 Enter 1 Hz STEP f on the keyboard Press SHIFT key Press the STEP key The display should read 1 Hz momentarily then return

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