HP 652A Operating And Service Manual
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HP 652A Operating And Service Manual

HP 652A Operating And Service Manual

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OPERATING AND SERVICE MAN
L
TEST OSCILLATOR
652A
HEWLETT
PACKARD

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Summary of Contents for HP 652A

  • Page 1 OPERATING AND SERVICE MAN TEST OSCILLATOR 652A HEWLETT PACKARD...
  • Page 3 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.

  • Page 4: Table Of Contents

    Model 6 52 A Table o f Contents TABLE OF CONTENTS Page Page Section Section Description ....1-1 5-18. Hum and Noise Test (Optional) ..5-7 1-1. Amplitude Stability Test (Optional) .. 5-7 1-6. Accessory Features ....1*1 5-]9. 1-8. Instrument Identification ..
  • Page 5 Model 652A Table of Contents LIST OF IllUSTRATIONS Page Figure Figure Page 1·1. Model 6 52A Test Oscillator ....1·0 5·7. Location of Internal Adjustments ..5·9 3·1. Location and Description of Controls 5·8. Frequency Calibration ....5·]0 and Indicators ....
  • Page 6 HEWLETT PACKARD SAFETY SUMMARY The following genoral safety precautions must be observed during ali phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safaty standards 01 design, manufacture, and intended use of the instrument. Hewlett·Packard Company assumes no liability for the customer's failure to comply with these requirements.
  • Page 7 SAFETY SYMBOLS General Definitions of Safety Symbols Used On Equipment or In Manuals. Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument. Indicates dangerous voltage (terminals fed from the interior by voltage exceeding 1000 volts must be so marked).

  • Page 8: Description

    1-7. The accessory furnished with the Model 6 5 2A is the sine-wave output that is adjustable from 10 microvolts to -hp- Model 1 l 04 8 C Feedthrough Termination. It is used to 3.16 volts into 5 0 or 600 ohms. The Model 6 5 2A Test...
  • Page 9 I-I. Table Specifications Frequency Range: 10 Hz to 10 MHz, 6 bands, dial Flatness (Amplitude readjusted using expanded calibrations: I to 10. scale on output monitor): +/- 0.25% 3 V and I V ranges Dial Accuracy: (including warm-up drift and +/- 10% 3 V to .

  • Page 10: Installation

    ,::H; ; I ,;UVlI 11 SECTION Ii INSTAllATION 2- 1 . INTROOUCTION. drawing is the part number for a 652A power cord equipped with a power plug of that configuration. If the 2-2. This section contains information and instructions appropriate power cord is not included with the instru�...
  • Page 11 Wrap instrument in heavy paper or plastic before placing in an inner container. bands. Use plenty of packing material around all sides of Mark shipping container with "Delicate Instrument, " instrument and protect panel faces with cardboard strips. "Fragile," etc. 2· 2 Model 652A Section II...

  • Page 13: Location And Description Of Controls And Indicators

    IDENTIFICATION P LATE: Show s in strument ser i a l AMPLITUDE Coar se and VERNIER Controls: Control s number. ampl it ude Signal a ppl ie d OUTPUT POWER TRANSFORMER (TI ) . ATTENUATOR. Figure 3-1. Location and Description of Controls and Indicators Sf'.dion lIT Model 652A...

  • Page 15: Theory Of Operation

    The The feedback voltage is removed on the XIOOK and XIM Wien bridge in the Model 652A Test Oscillator differs from the conventional Wien bridge circuit in the design of the resistive voltage divider network. The resistor in the FREQUENCY 0.

  • Page 16: Automatic Gain Control

    ModeJ652A Section IV an impedance converter between the monitor circuit and frequency range due to the value of resistors A2R8 and the power amplifier output circuit and as a current source to A2R9 exceeding the input impedance of the emitter follower provide full-scale monitor indications.

  • Page 17: Output Attenuator

    16 V circuit: A3Cll and A3R14. A3CI l adjusts the expand by a malfunction in the 652A circuitry. A direct short to monitor circuit response at 10 MHz, and A3R l 4 calibrates ground of either supply will result in an output current of the monitor at 10 kHz.
  • Page 18 WARNING These servicing instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing other than that can· tained in the operating instructions unless you are qualified to do so.
  • Page 19 Reference Supply n ± Resistor: fxd, 6500 a. -hp- Part No. 0811-0392 n ± Resistor: var, 500 b. ·hp- Part No. 21 " 0 0-0324 n ± c. -hp- Part No. 2100 - 1481 Resistor: var, 50 d. BatterYl 1.34 V d.

  • Page 20: Maintenance

    OUTPUT ATTENUATOR ..3.0 V 5-4. The equipment needed to properly maintain the OUTPUT MONITOR NORMAL Model 652A is listed in Table 5·1. The table lists the type • ..• ..OUTPUT AMPLITUDE...

  • Page 21: Frequency Range Test

    ' 0 ,0 d. Disconnect ac voltmeter from 50 ohm output termi­ 10.0 ± X ' O K nal of 652A and connect to 600 ohm output. Replace 50 X l O K ± 25.0 ohm load with a 600 ohm load.
  • Page 22 2. Connect the 11049A Thermal Converter +/- 560 microvolts +/- 4% directl y to the 50 n output of the 652A. The ac input is set for 7.0 m V at the output 3. Connect the 419A DC Nullmeter across of the thermal converter.
  • Page 23 Adjust 652A AMPLITUDE and VERNIER controls f. Set 652A FREQUENCY dial for 1 2 Hz and repeat for dc null meter indication of7.0 mY. Step 5·12e. g. Set 652A FREQUENCY dial for 1 5 Hz and repeat d. Adjust frequency supply for null indication. Do not Step 5·12e.

  • Page 24: 4. Output Monitor Accuracy Test

    Attenuator Test meter indication. a. Connect external attenuator, amplifier, ac voltmeter g. Repeat Step f of this paragraph at each of the 652A and digital voltmeter to 652A as shown in Figure 5·4. Use FREQUENCY RANGE and FREQUENCY dial settings an attcnuator with known accuracy.

  • Page 25: Distortion Test

    Distortion level, as indicated on distortion analyzer, . 70 dBm position. should be less than I %. g. Repeat Steps c through f of this paragraph with 652A d. Repeat Steps b and c to check distortion at each of frequency set to 10 MHz.

  • Page 26: Hum And Noise Test (Optional)

    Figure 5 · 2. d. Set recorder output adjustment of ac differential b. Set 652A controls as follows : voltmeter so that a ± 0.06 V variation of 652A output can be easily recorded. FREQUENCY RANGE X l OO .

  • Page 27: Output Impedance Test

    Output Impedance Test. and allow it to dry completely bef ore opera· ting. Do not use alcohol or any other cleaning a. Connect 50 ohm output of 652A directly to ac solution except mild detergen t and water. Do voltmeter.
  • Page 28 T O P � S l � . SiC4 SIC7 s!elo SiC9 6�2A - c - oeISA BOTTOM � A2C14 @A2R1 7 AI R 40 @A2R16 A2TPi$ 8A2TP2 [§lA2e5 Figure 5·7. Location of I nternal Adjustments. Mnrl�l () "i ? A Section V...

  • Page 29: Preliminary Distortion Adjustment

    5-28. Preliminary D istortion Adjustment bottom covers should be in place when final frequency and A2T P2 voltage tests are made. a. Connect 652A to distortion analyzer as shown in All internal shields must be in place and held Figure 5 · 5.

  • Page 30: Frequency Dial Calibration

    A2TP2. a. Preliminary mechanical adjustments (Perform only if necessary). Set 652A FREQUENCY dial to 1 0 . Readjust SI C2 and SI C7 alternately until count,r indicates frequency of 1 0 kHz and an A2TP2 voltage of - 370 mY.

  • Page 31: X]O Range Frequency Calibration

    Paragraph 5-30, Step over the entire range of the dial, A2TP2 voltage should not vary g. Set 652A FREQUENCY dial to 1 0. Readjust SI C2 more than 40 m V. and S I C 7 alternately (See Table 5-6) until frequency...

  • Page 32: Mhz Flatness Adjustment

    Set 652A FREQUENCY RANGE switch to XIM and alignment access covers with cut-outs lhat will FREQUENCY dial to 1 0. If 652A does not oscillate, adjust allow adjustments while the covers are in A2C5, S I CS and S I C I O .

  • Page 33: Output Adjustments

    Since there is a· direct interaction between Wavefonn g. Making all o wance for any error of the ac voltmeter at Adjustment and Amplitude Adjustment, recheck Ampli­ 1 0 MHz, adjust A I C l 5 for a 3.0 V indication on 652A tude Adjustment. monitor.

  • Page 34: Expanded Monitor Calibration

    5-43. 10 MHz Monitor Response Adjustment. 5-42. 10 kHz Monitor Calibration. Connect thermal converter, de null meter, and reference supply to 652A as shown in Figure 5-3, setting Set 652A controls as follows: 652A and reference supply outputs to minimum before connecting. FREQUENCY RANGE .

  • Page 35: After Calibration

    BRATION PROCEDURE, repeat PERFORMANCE TESTS troubles and problems; it presents a list of key pOints to be (paragraphs 5-7 through 5-20) to assure that the 652A is checked for normal circuit indications or conditions, which within specifications listed in Table 1 - 1 .

  • Page 36: Troubleshooting Information

    Limit condition if the power supplies are still diagram in Figure 6·1 , and the schematics of Figures 6·2, loaded by the 652A circuitry. In the Locked 6·3 and 6-4, when using the troubleshooting tree. Current Limit condition the de output drops to less than 2 V and does not return to normal 5·51.

  • Page 37: Troubleshooting The Oscillator Circuit

    ® ® The normal signal at A2 Pin 20, when the 652A Check for .72 V ac at the junction of A3C R I and output voltage is 3, will be a sine wave of about A3CR2 and check A3Ql , A3CRl , and A3CR2.

  • Page 38: Troubleshooting The Power Amplifier

    Paragraph 5-55) to A2 Pin 4 (the dc blocking capacitor is from C l , and to the 652A chassis ground. The capacitor not necessary). blocks any dc present on the signal generator.

  • Page 39: Servicing Etched Circuit Boards

    NOTE 5·60. SERV ICING ROTARY SWITCHES. For correct alignment, refer to Frequency Dial 5·6 1 . The Model 652A contains two rotary type switches: Calibration. Paragraph 5-29. FREQUENCY RANGE and OUTPUT ATTENUATOR. 5-20...
  • Page 40 Model Section V 652A " " " " " " � • • � • • • 2..3 - - " • ____ 5.S-,�,,-,,- -"-,,�--'" 1.0- -- -- -- 8.1 X I :I: � ii8 �o • f-(l; !;:; �...
  • Page 41 � � � � � � � � � I" " "" '§p-"W SB When using the troubleshooting tree, set the 652A controls as follows, unless stated otherwise for a particular step: +3CV ±O.9V AT AI P I N I 5.8V AC...
  • Page 42 INALS "I i£ +2.7V AT AI PIN EXPAN[l MONITOR CIRCUIT r - - ,- - - - - - - �� � � � �;/ 5.8V AC VOLTA I N 9 AT A I P I N J4 TRUE O.75V RMS AT CHECK MI -9V ±O.2V AT ,1,3 TP! COLLECTOR OF AI 09...
  • Page 43 P E R F O R M A N C E C H E C K T E S T C A R D Tests Perfonned by Hewlett-Packard Model 652A Test Oscillator Period/Frequency 5-7. FREQUENCY RANGE: Dial Max. Min. Freq. Range...
  • Page 44 +/- 0.25% 1 0 Hz to Max. Min. OUTPUT MONITOR ACCURACY: 5-14. 3.06 V 2.94 V Frequency 652A Attenuator DC Voltmeter 5-15. ATTENUATOR: I kHz J O MHz 8.91 mV to 9 .09 mV +20 dB 8.91 mV to 9.09 mV +10 dB 8.91 mV to 9 .09 mV...

  • Page 45: Circuit Diagrams

    6-2. This section contains the circuit diagrams necessary for the two rotary switches. operation and maintenance of the Model 652A. Figure 6·1 a block diagram which shows the overall relationship be· 6·3.
  • Page 46 F=== ==- POWER AMPLIFIER ==== ==� == == == == == == == == =; [jiM� O-- � ;-- -- --- - -- ---_." F£EDBACK " RI-RI2 A2RI4 OUTPUT AMPLITUDE I MP EDANCE A2 PIN 20 CON VE RTE R CIA,eIS COMP EMITTER...
  • Page 47 == == == == == = A2 ASSEMBLY ==== == == == ==�, WHT IORN/GRN WHT/ORN/YEL C2 2 652A- 8-0826A ASSEMBLY COMPONENT LOCATIONS 12 ASSEMBLY WIRE COLORS [BOTIOMI PINNQ. WlRE COLon WHITE BLACK WHT/ORN BLACK ORANGE WHT/GRN WHT/YEL "...
  • Page 49 � SIO(R) 10�C0 ;6� SIRI SIR, SIRS SIOK 4700 FEEDBACK � .1.C17 SIR4 SIR6 S!Rsn ' +T�5 LSICI3 StRIQ SIRI2 T' S 12M , '.23M 123K PF !210 �: 12.3K }1:ZlQJ C21--'-. 12PF'T' SWiRl 10KHz I MHz :OMHz ADJUST ADJUST ADJUST G R A "-FEEDBACK 51C2...
  • Page 50 DJ:QKJ ---- -- --Q • -- - -- -- - - - -J. -:- - -- -- -- '0-12V .," " " " r--'"-" 1.02 .+,' SHIELO - -- OUTPUT ATTENUATOR �-------- T ----------r---------- r -------- 7 iam) E(RI/ OIFI /O(R) elF) /e(R) B(F) A(F,Rl/...
  • Page 51 ASSEMBLY MONITOR CIRCUIT POWER SUPPLY -CRI- -CR2� --GR3- -CR4- -CR6- -RI- �C 6 - 8 __ +--BLK -RIO- -GRI2- HT I BLU -R 6 - -R7- -R3- -R43 - -CRI3- -R5- --R2-- -R 4 - -C3- -CRI4- -CRI -R8- -RII- -C19-- --020- -RJ2-...
  • Page 52 .. ��--,. " '" f­ � '" " "...
  • Page 53 --------------------------- ------------- � DIFFERENTIAL AMPLIFiER �VARIABLE REFERENCE SUPPLY� 9090 �16A TO "iSoaVDC 9090 RIB'" 1 " ' I" C:" '" 2'10;< 180K 270;( 240K :;- 10K '" ', e o ..6.19V - - - --- -- --- - - --- - - --- - - --- - - --- - - --- - - --- - - --- - - --'-5 2 Figure 6·3.
  • Page 54 ASSEMBLY MONITOR CIRCUIT POWER SUPPlY -CRI- -CR2- -CR5- -CR4- - C R 6 - ---<: R3 - -R I - -C6- -RIO- " __ -GR!2- -R6- -R43- - R7 - - R 3 - -CRf3- -R5- --82-- -CRI4 - - 8 4 - -C3- -CRI5- 6 ___...
  • Page 55 � POWER 't AI 00652 -66504 ..-3QV R43 3.9 NORMAL METER CIRCUIT " Ri 33K �CR 3 :10 +30V R6 3.9 - ---9, 0 $HI<: L O ON CABLE BETWEEN ON-Ortrt R5 324 SWITCH (S3,FRONT PANELi AND 115/230 C' 9 SWITCH (S4, REAR PANEl) MUST BE "...

  • Page 56: Replaceable Parts

    ORDERING INFORMATION. replacement parts. Figures 7-1 and 7-2 illustrate the important mechanical parts of the 652A. Table 7-1 7-5. To obtain replacement parts, address order or lists parts in alphameric order of their refer. e nce inquiry to your local Hewlett-Packard Field Office.
  • Page 57 < � MP44 THRUST SPRING BEHIND MP9 ATTACHING HARDWARE MPII 65IA-B-0691 DESCRIPTION ITEM -hp- PART NO. Screw: Se, ', 6-32xl/8"long 3030-0022 � � 3030-0001 Screw: Set, 8-32 x 3/16" long "" � 3030-0004 Screw: Set, 8-32 x 1" long �...
  • Page 58 652A Model Section r=== == == == = T OP==== == == == =-�i MPi6 MPI8 MPI9 MP21 MP20 MP36 7-2. Figure Chassis Component.s (Mechanical Parts)
  • Page 59 0:) LA k)ecnon v 11 Table Replaceable Parts (Cont'd) REFERENCE -hp - DESCRIPTION MFR. MFR. PART NO. DESIGNATOR PART NO. 00652-66504 PC board: power supply 28480 00652-66504 A1Cl Not assigned ± A1C3 0140-0177 C: fxd 400 pF 1 % 300 vdcw...
  • Page 60 b)LA MOClel Table 7·1 Replaceable Parts (Cont'd) REFERENCE -h p- DESCRIITION MFR. MFR. PART NO. DESIGNATOR PART NO. ± ± Al Rll R, fxd comp 23.2 kn 1 % l!BW 0698-4485 24546 C4-1/8·To··2322-F A1R12 R, fxd 5.76K 06984445 1% 1/8w ±...
  • Page 61 Heplacea ble Parts (Cont' d) Table 7 -hp­ REFERENCE DESCRIPTION MFH. MFR PART NO. DESIGNATOR PART NO. 00652-66501 Pc board: oscillator amplifier 28480 00652-66501 A2C1 0180-0061 C: fxd Al elect 100 IlF +75% -10% 15 vdcw 56289 30Dl07GOI5DC2- A2C2 0180-0237...
  • Page 62 Table 7-1. Replaceable Pans (Cont'd) - hp­ REFERENCE DESCRIPTION MFR. :yrPR. PAHT NO. DESIGNATOR PART NO. A2Q 9 1853 0007 TSTR: Si PNP 2N3251 04713 2N3251 Si NPN * A2QI0, A2Q11 1854-0254 TSTR: 04713 A2Q 12 1853-0012 TSTR: Si PNP 2N2904A...
  • Page 63 Table Heplaceable 7�1, Parts (Cont'd) -hp­ REFERENCE DESCRIPTION MFR PART NO. DESIGNATOR PART NO. A3C13, A3C14 0180-0032 fxd Al elect 10 J-LF +75% -lO'} G 12 vdcw 56289 30Dl06G012BA4 A3C15 0180-0059 fxd elect 10 f-LF +100% -10% 25 vdcw 56289...
  • Page 64 Table Replaceable Parts 7-l. (Cont'd) -h p- REFERENCE DESCRIPTION MFR_ PART ,,0 DESI GNATOR PART ,,0_ 1460-0256 Spring: compression -hp- 5060-0020 Gear Assembly -hp- 5020-0233 Collar -hp- 5020-0348 Shaft -hp- 5020-0641 Shaft: spur gear -hp- 5020-0639 Casting: Capacitor drive assembly...
  • Page 66 LIST OF MANUFACTURERS to Name) and their latest supplements, The date of revision and the date of the supplements uSed appear at the bottom of each page, Alpha­ The following code numbers are from the Federal Supply Code for Manufacturers Cataloging Handbooks H4-1 (Name to Code) and H4-2 (Code betical codes have been arbitrarily assigned to suppliers not appearing in the H4 Handbooks.

  • Page 67: Code List Of Manufacturers

    73899 81860 54294 Goshen Stamping & Tool Co..Goshen , Ind. Airpax Electronics, Inc . . Cambridge, Maryland HP Co Med. Elec. Div. Waltham , Mass. '73905 55026 JFD Electronics Corp..Brooklyn, N. Y.
  • Page 68 CHANGE No. 1 Delete A2C25· Delete A2R46 Change A2C l l to 200 microfarads, -hp- Part No. 0 1 80-0060. Change A2CR5 to a breakdown diode, 7.87 V +/- 2%, -hp- Part No. 1 902-0778. Change A2Q7 to 2N3393, -hp- Part No. 1 854-02 1 8 .
  • Page 69 CHANGE No. 5 Table 7-1 , Page 7-4: Change the -hp· Part No. of A I Q2 to I S50-0 1 07 Change the ·hp- Part No. of A I Q3 to I S53-0007 Change the -hp- Part No. of A I Q5 to 1 850-0 1 07 Cbange tbe ·hp- Part No.
  • Page 70 Appendix Model 652A CHANGE No. 7 Page 4-3 : Replace Paragraphs 4-29 through 4-32 with the following paragraphs: 4-29. R E G U LATED POWER SUPPL Y . 4-30. The regulated power supply provides a l l voltages required by the test oscillator circuits. The power supply...
  • Page 71 ® Page 5- 1 7 , Paragraph 5-5 1 : Change troubleshooting information Steps through to the following: Check the power supply connections to external circuits, and check the resistors in series with the connections (A2 Pins 1 , 2, 6 and 7 ; A3 Pin 4 and A l R 1 7 , Al R24, A I R26 and A l R28), A procedure for checklng the oscillator circuit is given in Paragraph 5·53.
  • Page 72 � powm MONITOR CIRCUIT SUPPLY WHrlBLU WHT/BRNIVIQ WHT/BRN/BLU WHT /eRN/ORN WHT/BRN/RED Figure C-4 . AI Component Locator, -hp- Part No. 00652-66502. Page 6-9/6-10, Figure 6-4: Change the Power Schematic drawing as in Figure C·S. Figure C�5. Power Supply Schematic Drawing.
  • Page 73 0 1 1 2 1 EB7525 R' val' eomp lin 2000 n ±30% O. 15 W AIR3 0687-3921 EFl3921 0 1 1 2 1 UPM-70RE(-hp-) obel R: £Xd camp 7500 Q ±59'0 1/4 W A1R4 2100-0090 71450 A 1 R S * 0683-7525...
  • Page 75 A2CR6, A2CR7. A2Q2, and A2Q3) havc been replaced. To c'heck this reconnect the peak detector, fepbee A2R16* Xl K with a ohm potentiometer, switch the 652A to the range and vary the value of the potentiometer, while tuning the dial over its entire range. Page 6 -4: Change A 2 Component Locator drawings a s in Figure r:�7.
  • Page 76 Model 652A Appendix C Page 6·5/6·6. Figure 6·2: Change Oscillator Schematic and Component Locator as in Figure C·S. � 6 11 StlElUH£ UI!PU£IIT UUlIUS �:: �:: I �:: I E15 01. "" " " '" "" '" rlt! " G�2 "...
  • Page 77 O P E R A T I N G N O T E 1 . The ·hp- Models 1 1 048C, 1 l 094B and I I 095A Feedthru Terminations can be used with any device having an input or output impedance of 50 ohms, 75 ohms or 600 ohms respectively.
  • Page 78 1 1 5 V and 230 V operation. j/""-- 2·1, 2·14. Delete from last sentence "and instruc­ Page Paragraph tions furnished with your instrument," and add " -hp- part number 5060-8740." ± ± 5·11, 5·29, Change 5 mV to...

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