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TM 11-6625-2780-14&P
TECHNICAL MANUAL
OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT
AND GENERAL SUPPORT MAINTENANCE MANUAL
INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
FOR
SIGNAL GENERATORS SG-1 112(V)1/U
(NSN 6625-00-566-3067)
AND SG-1l12(V)2/U (NSN 6625-00-500-6525)
(HEWLETT-PACKARD MODEL 8640B,
OPTIONS 001 AND 004)
HEADQUARTERS, DEPARTMENT OF THE ARMY
31 DECEMBER 1980
By Order of the Secretary of the Army:
E. C. MEYER
General, United States Army
Official: Chief of Staff
J. C. PENNINGTON
Major General, United States Army
The Adjutant General
DISTRIBUTION:
To be distributed in accordance with distribution list.
This manual contains copyright material reproduced by permission of the Hewlett-Packard Company.
TM 11-6625-2780-14&P
T ECHNICAL MANUAL HEADQUARTERS
DEPARTMENT OF THE ARMY
No. 11-6625-2780-14&P WASHINGTON, DC 31 December 1980
OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT,
AND GENERAL SUPPORT MAINTENANCE MANUAL
INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
FOR
SIGNAL GENERATORS SG-1112(V)1/U (NSN 6625-00-566-3067)
AND SG-1112(V)2/U (NSN 6625-00-500-6525)
(HEWLETT-PACKARD MODEL 8640B, OPTIONS 001 AND 004)
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes or if you know of a way to improve the
procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to Publications and
Blank Forms), or DA Form 2028-2 located in the back of this manual, direct to: Commander, US Army Com-
munications and Electronics Materiel Readiness Command and Fort Monmouth, ATTN: DRSEL-ME-MQ,
Fort Monmouth, NJ 07703.
In either case, a reply will be furnished direct to you.
This manual is an authentication of the manufacturer's commercial literature which, through usage, has been found to
rover the data required to opersaate and maintain this equipment. The manual was not prepared in accordance with military
specifications; therefore, the format has not been structured to consider categories of maintenance.
i
Model 8640B Option 004 Table of Contents
CONTENTS
Section Page
o INTRODUCTION . . . . . . . . . . . . . . . . . . . 0-1 Section Page
I GENERAL INFORMATION . . . . . . . 1-1 IV PERFORMANCE TESTS (cont'd)
1-1. Introduction . . . . . . . . . ...1-1 4-13. Frequency Range Test . . . . . . . 4-13
1-6. Specifications . . . . . . . . . . . . 1-1 4-14. Frequency Accuracy and Fine Tune Test . 4-14
1-8. Instruments Covered by Manual . . . . . . 1-1 4-15. Frequency Stability Vs Time and
1-13. General Description . . . . . . . . . . 1-2 Restabilization Time Test . . . . 4-16
1-19. Performance Characteristics . . . . . . . 1-2 4-16. Frequency Stability Vs Temperature Test. 4-18
1-20. Spectral Purity . . . . . . . . . . 1-2 4-17. Frequency Stability Vs Line Voltage Test . 4-19
1-26. Frequency Counter . . . . . . . . . 1-3 4-18. Frequency Stability Vs Load, Level, and
1-31. Phase-Lock Mode . . . . . . . . . 1-3 Mode Test . . . . . . . . . . 4-20
1-37. Amplitude Modulation . . . . . . . . 1-4 4-19. Harmonics Test . . . . . . . . . 4-21
1-42. Pulse Modulation . . . . . . . . . . 1-4 4-20. Sub-Harmonics and Non-Harmonic
1-45. Frequency Modulation . . . . . . . . 1-4 Spurious Test . . . . . . . . 4-23
1-48. Standard and Optional Audio Oscillators . . 1-5 4-21. Single Sideband Phase Noise Test . . . 4-25
1-51. Multi-Function Meter and Annunciators . . 1-5 4-22. Single Sideband Broadband Noise Floor
1-57. Output Level . . . . . 1-6 Test . . . . . . . . . . . . 4-27
1-61. Options . . . . . . . . . . . . . . 1-6 4-23. Residual AM Test . . . . . . . . 4-30
1-65. Accessories Supplied . . . . . . . . . 1-6 4-24. Residual FM Test . . . . . . . . 4-31
1-69. Equipment Available . . . . . . . . . 1-6 4-25. Output Level Accuracy Test (abbreviated). 4-34
1-76. Service and User Aids . . . . . . . . . 1-7 4-26. Output Level Accuracy Test (complete) . 4-39
4-27. Output Level Flatness Test . . . . . 4-45
1-82. Test Equipment Required . . . . . . . . 1-7 4-28. Output Impedance Test (Signal-Frequency) . 4-47
4-29. Output Impedance Test (Broadband) . . . 4-49
II INSTALLATION . . . . . . . . . . . 2-1 4-30. Auxiliary Output Test . . . . . . . . 4-50
2-1. Introduction . . . . . . . . . . . . 2-1 4-31. Output Leakage Test . . . . . . . . 4-51
2-3. Initial Inspection . . . . . . . . . . . 2-1 4-32. Internal Modulation Oscillator Test . . . . 4-53
2-5. Preparation for Use . . . . . . . . . . 2-1 4-33. Internal Modulation Oscillator
2-6. Power Requirements . . . . . . . . 2-1 Distortion Test (Option 001) . . . . . 4-55
2-8. Line Voltage Selection . . . . . . . . 2-2 4-34. AM 3 dB Bandwidth Test . . . . . . . 4-56
2-11. Power Cable . . . . . . . . . . . 2-2 4-35. AM Distortion Test . . . . . . . . . 4-58
2-13. Mating Connectors . . . . . . . . . 2-3 4-36. AM Sensitivity and Accuracy Test . . . . 4-59
2-15. Operating Environment . . . . . . . 2-3 4-37. Peak Incidental Phase Modulation Test . . 4-62
2-18. Bench Operation . . . . . . . . . . 2-3 4-38. Demodulated Output Accuracy Test . . . 4-65
2-20. Rack Mounting . . . . . . . . . . 2-3 4-39. AM Phase Shift Test . . . . . . . . . 4-69
2-22. Storage and Shipment . . . . . . . . . 2-3 4-40. AM Flatness Test . . . . . . . . . . 4-71
2-23. Environment . . . . . . . . . . . 2-3 4-41. Pulse Modulation Test . . . . . . . . 4-73
2-25. Packaging . . . . . . . . . . . . 2-3 4-42. Pulse On/Off Ratio Test . . . . . . . 4-77
4-43. FM 3 dB Bandwidth Test . . . . . . . 4-78
III OPERATION ..... . . . . . . 3-1 4-44. FM Distortion Test . . . . . . . . . 4-79
4-45. FM Sensitivity and Accuracy Test . . . . 4-81
3-1. Introduction . . . . . . . . . . . . 3-1 4-46. Incidental AM Test . . . . . . . . . 4-85
3-3. Panel Features . . . . . . . . . . . 3-1 4-47. Counter External Sensitivity Test . . . . 4-87
3-5. Operator's Checks . . . . . . . . . . 3-1 4-48. Internal Reference Accuracy Test . . . . 4-88
3-7. Operating Instructions . . . . . . . . . 3-1 4-49. Internal Reference Drift Rate (Stability)
3-9. Operator's Maintenance . . . . . . . . 3-1 Test . . . . . . . . . . . . .4-89
4-50. Phase Lock Restabilization Time Test . . . 4-92
IV PERFORMANCE TESTS . . . . . . . . 4-1
4-1. Introduction . . . . . . . . . . . . 4-1 V ADJUSTMENTS . . . . . . . . . . 5-1
4-4. Equipment Required . . . . . . . . . 4-1 .
5-1. Introduction . . . . . . . . . . . 5-1
4-6. Test Record . . . . . . . . . . . . 4-1 5-3. Safety Considerations . . . . . . . . 5-1
4-8. Test Procedures . . . . . . . . . . . 4-1 5-9. Test Equipment Required . . . . . . . 5-1
4-12. Basic Functional Checks . . . . . . . . 4-5 5-11. Posidriv Screwdrivers . . . . . . . 5-1
ii
Table of Contents Model 8640B Option 004
CONTENTS (cont'd)
Section Page Section Page
V ADJUSTMENTS (cont'd) 7-11. A10A2 RF Divider Assembly Improvement
5-13. Blade Tuning Tools . . . . . . . . 5-1 (Serial Number Prefixes 1333A and Below). 7-16
5-15. Service Aids . . . . . . . . . . . 5-1 7-13. A18, A20, and A22 Power Supply Regula-
5-19. Factory Selected Components . . . . . . 5-2 tor Improvements (Serial Number Prefixes
5-22. Post-Repair Tests and Adjustments . . . . . 5-3 1333A and Below) . . . . . . . . 7-16
5-25. Power Supply Adjustments . . . . . . . 5-8 7-15. Al1 Variable Frequency Modulation
5-26. Fixed-Frequency Modulation Oscillator Oscillator Improvements (Serial Number
Adjustment . . . . . . . . . . . 5-8 Prefixes 1339A and Below) . . . . . 7-16
5-27. Variable Frequency Modulation Oscillator 7-18. A12 Rectifier Assembly Input Crowbar
Adjustment (Option 001) . . . . . . . 5-9 Failures (Serial Number Prefixes 1339A
5-28. Meter Adjustments . . . . . . . . . . 5-12 and Below) . . . . . . . . . . . 7-16
5-29. RF Detector Offset Adjustment . . . . . . 5-13 7-20. Reliability Improvements in AM and Pulse
5-30. Output Level Vernier and Meter Adjustment. . 5-14 Circuits (Serial Number Prefixes 1345A
5-31. Preliminary AM Adjustments . . . . . . 5-17 and Below) . . . . . . . . . . 7-16
5-32. AM Accuracy Adjustment . . . . . . . . 5-19 7-23. All Variable Frequency Modulation
5-33. Peak Deviation and Range Switch Oscillator (Option 001) Improvement
Adjustment . . . . . . . . . . . 5-22 (Serial Number prefixes 1350A and
5-34. Range Switch Adjustment . . . . . . . . 5-22 Below) . . . . . . . . . . . 7-16
5-35. VT Pot (A3R1) Adjustment . . . . . . . 5-23 7-26. Improvement in Lock Acquisition Capa-
5-36. VT Voltage Adjustment . . . . . . . . 5-25 bility (Serial Number Prefixes 1350A
5-37. RF Oscillator End Stop Adjustment . . . . 5-25 and Below). . . . . . . . . . 7-17
5-38. RF Oscillator Output Power Adjustment . . . 5-28 7-28. +44.6V Regulator Improvement (Serial
5-39. RF Filter Adjustment . . . . . . . . . 5-29 Number Prefixes 1405A and Below) . 7-17
5-40. preliminary FM Adjustments . . . . . . . 5-33 7-30. Line Switch Modification (Serial Number
5-41. FM Linearity Adjustment . . . . . . . . 5-35 Prefixes 1406A and Below) . . . . . 7-17
5-42. FM Linearity Adjustment (Alternate) . . . . 5-38 7-33. Reduction in Popcorn Noise on Power
5-43. FM Sensitivity Adjustment . . . . . . . 5-40 Supplies (Serial Number Prefixes 1406A
5-44. Internal Reference Frequency Adjustment . . 5-42 and Below) . . . . . . . . . . . 7-18
7-35. Recommended Fuse Replacement for
220/240V Operation (Serial Number
VI REPLACEABLE PARTS . . . . . . . .6-1 Prefixes 1423A and Below) . . . . . 7-18
6-1. Introduction . . . . . . . . . ...6-1
6-3. Exchange Assemblies . . . . . . . . . 6-1 VIII SERVICE . . . . . . . . . . . . 8-1
6-5. Abbreviations. . . . . . . . . . . .6-1 8-1. Introduction : . . . . . . . . . . 8-1
6-7. Replaceable Parts List . . . . . . . . .6-1 8-5. Principles of Operation . . . . . . . . 8-1
6-11. Ordering Information . . . . . . . . . 6-1 8-8. Troubleshooting . . . . . . . . . . 8-1
6-14. Spare Parts Kit . . . . . . . . . .. 6-1 8-12. Recommended Test Equipment . . . . . 8-1
6-16. Illustrated Parts Breakdowns . . . . . . . 6-2 8-14. Service Aids . . . . . . . . . . . 8-1
8-23. Repair . . . . . . . . . . . . . 8-3
8-24. Factory Selected Components . . . . 8-3
8-26. Etched Circuits . . . . . . . . . 8-3
V I I MANUAL CHANGES . . . . . . . . .7-1
8-28. Etched Conductor Repair . . . . . . 8-3
7-1. Introduction . . . . . . . . . . ..7-1 8-30. Component Replacement . . . . . . 8-3
7-3. Manual Changes.. . . . . . . . ..7-1 8-37. Illustrated Parts Breakdowns . . . . . 8-5
7-6. Manual Change Instructions . . . . . . . 7-4 8-39. Basic Circuit Theory . . . . . . . . 8-5
7-7. Instrument Improvement Modifications . . . 7-16 8-40. Binary Circuits and Symbols . . . . . 8-5
7-9. Improved FM Bandwidth on 5 kHz Devia- 8-53. Binary Registers . . . . . . . . . 8-8
tion Range (Serial Number Prefixes 8-60. Decade Counters and Symbols . . . . 8-9
1323A and 1327A) . . . . . . . . .7-16 8-68. Linear Integrated circuits . . . . . 8-11
iii
Model 8640B Option 004 Table of Contents
SERVICE SHEETS
Service Sheet Page Service Sheet Page
1 Overall Block Diagram . . . . . . . . 8-18 15 AM Interconnections, RF ON/OFF Switch
2 FM Circuits and RF Oscillator and Demodulation Amplifier
Troubleshooting . . . . . . . . . 8-20 (A9, A26A8) . . . . . . . . . . 8-48
3 AM/AGC Circuits and Output Amplifier 16 RF Vernier (A19A1, A26) . . . . . . . 8-50
Troubleshooting . . . . . . . . . 8-22 17 Meter Circuits (A2, A4, A6) . . . . . . 8-52
4 Counter/Lock Circuits Troubleshooting . . 8-24 18 Counter RF Scaler (A8A1, A8A3) . . . . 8-54
5 RF Oscillator (A3) . . . . . . . . . 8-26 19 Counter Time Base (A8A3, A9) . . . . . 8-56
6 FM Amplifiers (A3, A5, A9, A13) . . . . 8-28 20 Up/Down Counter & Display (A8A2, A8A4) . 8-58
7 FM Shaping Circuits and Phase Lock 21 Counter Phase Lock Circuits (A8A2) . . . 8-60
Loop Filter (A7, A9) . . . . . . . 8-30 22 Power Supply Circuits
8 Over-Deviation Detector and Meter (A12, A14, A20, A22) . . . . . . . 8-62
Control Circuits (A6, A7, A9) . . . . 8-32 23 ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo