HP-650A-Manual 电路图.pdf

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1、I . : HP Archive . . This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! . . On-line curator: Tony Gerbic RadioFans.CN 收音机爱 好者资料库 O P E R A T I O N A N D S E R V I C I N G M A N U A L F O R MODEL 650A TEST OSCILLATOR = e+ -. 650A-1 SERVICE MANUAL

2、R E. E. INST This is a combined Operation and Service Manual f -hp- 650A Test Oscillators. This manual contains plete operation and servicing instructions for the and may be used in place of the Instruction and Ope Manual oripinallv sumlied with each instrument. - Copyright 1956 by Hewlett-Packard C

3、ompany The mformation contalned an thls booklet is intended for the operation and main- tenance o Hewlett- Packard equipment and is not to be used otherwise or reproduced without the written consent of the Hewlett- Packard Company. HEWLETT-PACKARD COMPANY 275 PAGE MILL ROAD, PAL0 ALTO, CALIFORNIA. U

4、.S.A. , 650A0Ol3-p RadioFans.CN 收音机爱 好者资料库 Section I GENERAL DESCRIPTION 1-1 General . 1 1-2 Accessories . 2 1-3 Inspection . 2 I1 OPERATING INSTRUCTIONS 2-1 Controls and Terminals . 3 2-2A Setting to Frequency . 4 2-2B Loading and Use of Internal Voltmeter . 4 2-2C Special Consideration with +10/3.

5、0 Attenuator Setting . . 4 2-2D Connecting A 600 Ohm Load . 4 2-2 Operation . 3 2-2E Output Divider Cable . . 4 I11 CIRCUIT DESCRIPTION AND INSTRUMENT MODERNIZATION 3-1 Introduction . 7 3-2 Oscillators . 7 3-2A Low Frequency Oscillator . 7 3-2B References . 7 3-2C High Frequency Oscillator . 7 3-3 B

6、uffer Amplifier . 8 3-4 AVC Amplifier . 8 3 - 5 Output Amplifier . 9 3-6 Output Monitor . 9 3-7 Output Attenuator . 9 3-8 Power Supply . 9 3-9 Procedure for Complete Modernization of Any Instrument . 10 3-9A Serial No . 529 and Below . 10 3-9B Serial No . 530 Through 589 . 11 3-9C Serial No . 590 Th

7、rough 1349 . 11 3-9D Serial No . 1350 Through 1649 . 11 3-9E Serial No . 1650 Through 1899 . 11 3-9F Serial No . 1900 Through 2499 . 12 3-9G Serial No . 2500 Through 2899 . 12 3-9H Serial No . 2900 Through 2999 . 12 3-91 Serial No . 3000 Through 3249 . 12 3-95 Serial No . 3250 Through 3349 . 12 3-9K

8、 Serial No . 3350 Through 3399 . 12 3-9L Serial No . 3400 Through 3449 . 13 3-9M Table of Parts for Modernization . 13 N MAINTENANCE 4-1 Cabinet Removal . 15 4-2 Lubrication of Tuning Capacitor Drive Mechanism . 15 4-3 Drive System for Oscillator Tuning Capacitors . 15 4-4 Tube Replacement . 15 4-4A

9、 Replacement of V1. V2. V3 . V4 . or V5 . 15 4-4B Replacement of V6. V7 . V8 . V9. or V10 . 16 4-4C Replacement of V11 or V12 . 16 4-4D Replacement of V13 or V14 . 16 4-4E Replacement of V15 . 17 4-4F Replacement of V16 . 17 4-4G Replacement of V17 . 17 4-4H Replacement of Lamp R80 . 17 RadioFans.CN

10、 收音机爱 好者资料库 TABLE OF CONTENTS (Continued) Section Iv V Figure 1-1 1-2 2-1 3-1 3 -2 3-3 3-4 4-1 4-2 4-3 4-4 MAINTENANCE (continued) 4-5 Miscellaneous Tests and Adjustments . . . 4-5A Setting V1, V2, V3, V4 and V16 Heater Voltage . 4-5B Setting Regulated Power Supply . . . . 4-5C Balancing Oscillator

11、Output Levels . . . 4-5E Output Meter Sensitivity Adjustment . . . 4-5F Attenuator Check . . . . . . . 4-5G Checkfor 60 CPSBeat . . . . . . 4-5H Instrument Response to Line Voltage Changes . 4-51 Output Impedance . . . . . . . 4-55 Maximum Output Voltage . 4-6 Complete Test Procedure . 4-5D Check Ou

12、tput Hum Level . 4-6A Heater and Regulated Power Supply Voltages . 4-6B Preliminary Low Frequency Response Adjustment 4-6C Low Frequency Oscillator Output Voltage . . 4-6D Low Frequency Oscillator Distortion . . . 4-6E Low Frequency Output Distortion . . . . 4-6F Calibration of Low Frequency Oscilla

13、tor . . 4-6G Low Frequency Oscillator Response . . . 4-6H High Frequency Oscillator Amplitude Adjustment 4-61 Output Meter Frequency Response Adjustment . 4-65 High Frequency Oscillator Response Adjustment 4-6K High Frequency Distortion Measurement . . 4-6L Check FM at 10 MC . . . . . . . 4-6M Calib

14、ration of High Frequency Oscillator . . 4-6P Other Adjustments . . . . . . . 4-6N Calibration of XlOOKC Range 4-7 Trouble Shooting . . . . . . . . TABLE OF REPLACEABLE PARTS 5-1 General . . . . . . . . . 5-2 Table of Replaceable Parts . . . . . LIST OF ILLUSTRATIONS Page . . . 1 7 . . . 1 7 . . . 1

15、7 . . . 1 7 . . . 1 7 . . . 1 7 . . . 1 7 . . .18 . . . 1 8 . . . 1 8 . . .18 . . . 1 8 . . . 1 9 . . . 1 9 . . . 1 9 . . . 1 9 . . . 1 9 . . . 1 9 . . . 2 0 . . . 2 0 . . . 2 1 . . . 2 1 . . . 2 1 . . . 2 2 . . . 2 2 . . . 2 2 . . . 2 2 . . . 2 5 . . . 3 3 . . Q 3 3 Page -hp- Model 650A Test Oscill

16、ator . . . . . . . . . 1 Accessory Cable Assemblies . . . . . . . . . . 2 Block Diagram of -hp- Model 650A Test Oscillator . . . . . 6 Simplified Schematic Diagram of High Frequency Oscillator Section . 8 Simplified Diagram of High Frequency Oscillator AVC Control System . 8 Lubrication Points for T

17、uning Capacitor Drive Mechanism . . . 14 100 KC Filter . . . . . . . . . . . . . 18 Calibration and Response Check for Low Frequency Oscillator . . 20 Equipment for High Frequency Distortion Measurement . . . . 22 Schematic Diagram of Output Divider Cable . 4 Simplified Schematic for Power Supply Re

18、gulator . . . . .9 SPECIFICATIONS FOR MODEL 650A TEST OSCILLATOR FREQUENCY RATING FREQUENCY RANGE: FREQUENCY DIAL CALIBRATION : RANGES: FREQUENCY RESPONSE : FREQUENCY STABILITY: POWER OUTPUT RATING POWER OUTPUT: DISTORTION: HUM LEVEL: OUTPUT MONITOR OUTPUT ATTENUATOR ATTENUATOR ACCURACY: POWER SUPPL

19、Y RATING VOLTAGE: FREQUENCY: ACCESSORIES FURNISHED LENGTHOVERALL: CONNECTORS: OVERALL DIMENSIONS CABINET MODEL: RELAY RACK MODEL: PANEL SIZE: WEIGHT CABINET MODEL : RACK MODEL: 10 cps to 10 MC 1 to 10 X l R 10 to 100 cps x 1 0 m 100 to 1000 cps XlKC 1 to 10 KC X 1 OKC 10 to 100 KC XlOOKC 100 to 1000

20、 KC X1M 1 to 10 MC f l db from 10 cps to 10 MC at rated output. t2% from 10 cps to 100 KC and f3% from 100 KC to 10 MC. Includes calibration error, warm-up drift, and line voltage variations. 15 milliwatts into a 600 ohm resistive load. 3 volt output signal 600 ohm source impedance. 6 ohm source imp

21、edance is available with the voltage divider (65A-16D Output Cable). L e s s than 1% from 20 cps to 100 KC and approximately 5% from 100 KC to 10 MC. L e s s than . 5% of the maximum attenuated signal level. A vacuum tube voltmeter monitors the level a t the input to the attenuator in volts and db w

22、hen the instrument is properly terminated. Zero db - 1 m w in 600 ohms. Accuracy is +5% of full scale reading. Meter scales: 0-1 volt; 0-3 volt; -12 to t2 dbm. The output level is attenuated 50 db in 10 db steps. ator when used with the AMPLITUDE control provides a con- tinuously variable output vol

23、tage from t12 dbm to -50 dbm that is from 3 volts to 3 millivolts. Low level sources down to 30 microvolts m a y be provided by using the 65A-l6D Output Cable (voltage divider). f l db when the instrumentis workinginto 600 ohms resistive load. The attenu- 115 o r 230 volts 210% 50 to 1000 cps 65A-l6

24、D Output Cable (voltage divider) 26 Front (marked 6 0 0 , ) In - Banana plugs spaced 3/4 Out - Universal binding posts spaced 3/4 Out - Universal binding posts spaced 3/4 Rear (marked 6,) 20-1/2 wide x 12-1/2 high x 14-1/4 deep 19 wide x 10-1/2 high. 19 wide x 10-1/2 high. Depth behind panel 13. 45

25、lbs. net. 38 lbs. net. SECTION 1 general descrtpgton 1-1 GENERAL The Hewlett-Packard Model 650A Test Oscillator is a wide range precision resistance tuned oscillator cover- ing from 10 cps to 10 MC. It has a highly stable output signal level that is adjustable from 30 microvolts to 3 volts into 600

26、ohms. Frequency response is essen- tially flat (il db) throughout the complete extended range. The output impedance is normally 600 ohms. Where a low source impedance is desired, 6 ohms is pro- vided by the Voltage Divider Cable supplied with the instrument. The Model 650A Test Oscillator output vol

27、tage is con- stantly monitored by a vacuum tube voltmeter at the input to the output attenuator system. This VTVM has two voltmeter scales plus a dbm scale (0 dbm = 1 milliwatt in 600 ohms). The attenuator control, in conjunction with the AMPLITUDE control, will pro- duce a monitored signal of any d

28、esired level when the instrument is resistive loaded with 600 ohms. The flexibility and simplicity of the 650A Test Oscilla- tor find a wide variety of uses in audio, video, rf, and alignment applications as well as laboratory wide band measurements. This instrument was designed for such application

29、s as fast and accurate testing of filter trans- - Figure 1-1 -hp- Model 650A Test Oscillator -1 - v - 16A kk 44 u _ I AC-I6B LL- 45 . Figure 1-2. Accessory Cable Assemblies mission characteristics, tuned circuit response, com- plete receiver alignment, telephone or telegraph carrier equipment, plus

30、video and audio amplifiers. The Model 650A Test Oscillator is well suited as a signal source for a f and rf bridge measurements. The wide range of test frequencies necessary for repair and testing of electronic frequency counters is also available from the 650A Test Oscillator. 1-2 ACCESSORIES The M

31、odel 650A Test Oscillator is supplied complete with a 65A-16D Output Divider Cable. The following accessories may be purchased separately: a. -hp- Model AC-16A Cable Assembly. Equipped with two dual banana plugs having 3/4 inch cen- ters. Made from 50 ohm coaxial cable type RG-58/U. (See Figure 1-2.

32、) -2- b. -hp- Model AC-16B Cable Assembly. Same as AC-16A except one dual banana plug is replaced by a UG-88/U type BNC male connector. (See fig- ure 1-2.) c. -hp- Model AC-44 Cabinet. This cabinet was de- signed for use with Hewlett-Packard instruments having 10-1/2 in. x 19 in. front panels such a

33、s the Model 650 Test Oscillator. Cabinets are equipped with sturdy carrying handles and an easily detached back cover. Finish is grey wrinkle to match -hp- grey baked enamel panel color. Overall dimensions are 20-3/4 in. wide, 12 in. high, and 14 in. deep. Weight is approximately 15 pounds. 1-3 INSP

34、ECTION This instrument has been thoroughly tested and in- spected prior to shipment and is ready for use when received. Carefully examine for possible shipping damage before and after unpacking. If any shipping damage is found, refer to Claim for Damage in Ship- ment! I I I I 1 I I I I 1 I I I I I t

35、 I I i SECTION 2 operating instruceions 2-7 CONTROLS AND TERMINALS ON This toggle switch controls the power transformer primary circuit. When switch is ON, the calibrated FREQUENCY dial is also illuminated. FREQUENCY RANGE SWITCH This six-position rotary switch has markings of XlOq XlOOv: XlKC, XlOK

36、C, XlOOKC, and X1M. The posi- tion of this switch indicates the multiplication factor which must be applied to the reading of the FREQ- UENCY dial to determine output frequency. FREQUENCY Oscillator frequency on any band is determined by rotating the two control knobs under the tuning dial. The uppe

37、r knob provides coarse tuning while the lower knob provides a 6 to 1 mechanical vernier for fine tuning. TUNING DIAL The tuning dial is accurately calibrated from .9 through 10. The dial reading multiplied by the Frequency Range Switch setting is the instrument output frequency. R.M.S. VOLTS/DB. Thi

38、s rotary switch is the output attenuator control which provides signal levels from -40 dbm to +10 dbm in 10 db steps. This switch also indicates voltage across a 600 ohm load connected to output terminals when instrument output is adjusted for a full scale voltmeter indication. Attenuator constants

39、and switching are shown in a separate schematic detail on schematic diagram or Power Supply Section. Note that this control becomes a straight-through connection when rotated full clock- wise and the attenuator is effectively switched out of the circuit. AMPLITUDE This control permits adjustment of

40、input level to the output amplifier and thereby controls instrument out- put level. Any desired output signal level between the 10 db steps of the R.M.S. VOLTS/DB selector switch can be obtained. OUTPUT METER This meter continuously monitors the signal level when operating into a 600 ohm resistive l

41、oad. It in- dicates as a full scale deflection the value of the R.M.S. VOLTS/DB selector switch setting. The meter is in- dicated as M1 on the schematic diagram and together withV16 and associated components, constitutes the VTVM monitor section. 600 A The output terminals are universal binding past

42、s on 3/4 in. centers. The output signal is developed between these two terminals with the one marked G grounded to the instrument chassis. FUSE The fuseholder. located on rear of chassis, contains a 2 ampere slo-blo fuse for 115 voltoperation. If instrument power transformer primary connections have

43、 been changed for 230 volt operation, a 1 ampere slo-blo fuse must be used. POWER CABLE The three conductor power cable supplied with this instrument is terminated in a polarized three prong male connector recommended by the National Elec- trical Manufacturers Association. The third contact is an of

44、fset round pin added to a standard two-blade ac plug which grounds the instrument chassis when used with the appropriate receptacle. To use this NEMA plug in a standard two contact outlet an adapter will be required. The ground connection emerges from the adapter as a short lead which should be con-

45、 nected to ground for the protection of operating per- sonnel. - NOTE - This Model 650A Test Oscillator is shipped from the factory with the power transformer dual primary windings connected in parallel for 115 volt operation. If operation from a 230 volt source is desired. primary windings must be

46、reconnected in series as shown in the de- tail on the schematic diagram. A simultaneous fuse change will also be required. 2-2 OPERATION The operation procedure for the -np- Model 650A Test Oscillator is as follows: a. Connect instrument to power source of 115 volts. 50-1000 cps unless modified for

47、230 volt operation. -3- r-1 r-1 4 I n I n I 6f2 SOURCE I 300 f 2 SOURCE TO IMPEDANCE I 650 A OUTPUT I 4 I n G L- Figure 2-1. Schematic Diagram of Output Divider Cable b. Turn instrument on and, for best results, allow a minimum warm-up time of 15 minutes. c. Select desired output frequency by adjusting the Range Switch and FREQUENCY controls. d. Connect load to output terminals and adjust for desired output level by setting attenuator switch and AMPLITUDE controls. Refer to the following paragraphs for specific instruc- tions on setting to a frequency, loading. and use of the output monitor.