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MODEL 8640B TM 9-4935-601-14-7&P

Figure 8-40. A26A3 Modulator Assembly Component Locations.

Figure 8-41. A26A4 AGC Amplifier Assembly Component Locations.

Figure 8-42. AGC Amplifiers and Amplitude Modulator Schematic Diagram.

8-43

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Table of Contents5
Administrative Storage19
Destruction of Army Material to Prevent Enemy Use19
General19
Maintenance Forms and Records19
Reporting Equipment Improvement Recommendations (EIR)19
HP Model 8640B Signal Generator (Option 001) and Accessories Supplied20
Instrument Covered by Manual21
Introduction21
Section I21
- General Information21
General Description22
Measured Single Sideband Noise Vs Offset from Carrier22
Performance Characteristics22
Spectral Purity22
Frequency Counter23
Phase-Lock Mode23
Specified Signal-To-Phase Noise Ratio23
Amplitude Modulation24
Frequency Modulation24
Pulse Modulation24
Pulsed RF24
FM Distortion Vs FM Rate25
Multi-Function Meter and Annunciators25
Output Level25
Standard and Optional Audio Oscillators25
Accessories Supplied26
Equipment Available26
Options26
Test Equipment Required27
Warranty27
Recommended Test Equipment33
Recommended Test Accessories40
FM Linearity Circuit41
- Installation43
Initial Inspection43
Introduction43
Line Selector43
Power Requirements43
Preparation for Use43
Line Voltage Selection44
Power Cable44
Power Cables Available44
Bench Operation45
Environment45
Mating Connectors45
Operating Environment45
Packaging45
Rack Mounting45
Storage and Shipment45
Preparation for Rack Mounting46
- Operation47
Introduction47
Lamp Replacement47
Operating Instructions47
Operator's Checks47
Operator's Maintenance47
Panel Features47
Front Panel Controls, Indicators, and Connectors48
Rear Panel Controls, and Connectors52
Operator's Checks57
Setting the Frequency and Amplitude Controls58
Setting the Modulation Controls61
- Performance Tests65
Equipment Required65
Introduction65
Test Procedures65
Test Record65
Frequency Range Test66
Frequency Accuracy and Fine Tune Test67
Frequency Stability Vs Time and Restabilization Time Test69
Frequency Stability Vs Time and Restabilization Time70
Frequency Stability Vs Temperature Test71
Frequency Stability Vs Line Voltage Test72
Frequency Stability Vs Load, Level, and Mode Test73
Frequency Stability Vs Load, Level, and Mode Test74
Harmonics Test75
Specifications75
Sub-Harmonics and Non-Harmonic Spurious Test77
520 Mhz Notch Filter78
Single Sideband Phase Noise Test79
Single Sideband Phase Noise Test Setup79
Single Sideband Broadband Noise Floor Test81
Single Sideband Broadband Noise Floor Test Setup82
Residual am Test84
Residual am Test Setup84
Residual FM Test85
- Test Setup87
Output Level Accuracy Test (Abbreviated)88
Output Level Accuracy Test Setup (Abbreviated)89
Output Level Accuracy Test Setup (Complete)95
Output Level Flatness Test100
Output Level Flatness Test Setup100
Output Impedance Test (in Band)101
Output Level Flatness Test101
Output Impedance Test Setup (in Band)102
Output Impedance Test (out of Band)103
Output Impedance Test Setup (out of Band)104
Auxiliary Output Test105
Output Leakage Test106
Output Leakage Test Setup106
Internal Modulation Oscillator Test108
Internal Modulation Oscillator Test Setup108
Internal Modulation Oscillator Distortion Test (Option 001)109
Internal Modulation Oscillator Distortion Test Setup110
AM 3 Db Bandwidth Test111
AM 3 Db Bandwidth Test Setup111
AM Distortion Test113
AM Distortion Test Setup113
AM Sensitivity and Accuracy Test114
AM Sensitivity and Accuracy Test Setup115
Peak Incidental Phase Modulation Test Setup118
Peak Incidental Phase Modulation Test119
Pulse Modulation Test120
Pulse Modulation Test Setup121
Pulse Measurements122
FM 3 Db Bandwidth Test Setup125
FM Distortion Test Setup127
FM Sensitivity and Accuracy Test Setup129
Incidental am Test Setup132
Counter External Sensitivity Test Setup134
Internal Reference Accuracy Test Setup135
Internal Reference Drift Rate (Stability) Test Setup137
Performance Test Record141
Pulse On/Off Ratio Test146
Counter External Sensitivity Test147
FM 3 Db Bandwidth Test147
FM Distortion Test147
FM Sensitivity and Accuracy Test147
Incidental am Test147
Internal Reference Accuracy Test147
Internal Reference Drift Rate (Stability) Test148
Phase Lock Restabilization Time Test148
Recommended Test Abridgements149
Blade Tuning Tools152
Introduction152
Pozidriv Screwdrivers152
Safety Considerations152
Service Aids152
Test Equipment Required152
Factory Selected Components153
Post-Repair Test and Adjustments154
Post-Repair Test and Adjustments155
Fixed-Frequency Modulation Oscillator Adjustment159
Power Supply Adjustments159
Variable-Frequency Modulation Oscillator Adjustment (Option 001)160
Meter Adjustments163
RF Detector Offset Adjustment163
Output Level Knob Adjustment164
Output Level Vernier and Meter Adjustment165
Output Level Vernier and Meter Adjustment Test Setup166
AM Sensitivity Adjustment168
AM Sensitivity Adjustment Test Setup168
Peak Deviation and Range Switch Adjustment170
Range Switch Adjustment171
VT Pot (A3R1) Adjustment172
VT Pot Adjustment172
VT Voltage Adjustment173
Filter Terminology174
RF Filter Adjustment174
RF Filter Adjustment Test Setup175
RF Filter Check177
Mhz High Band Capacitor Adjustment Orientation178
Preliminary FM Adjustments178
FM Linearity Adjustment180
FM Linearity Display183
FM Sensitivity Adjustment183
FM Sensitivity Adjustment Test Setup184
Internal Reference Frequency Adjustment185
Internal Reference Frequency Adjustment Test Setup186
RF Oscillator End Stop Adjustment187
- In Maximum Ccw Position. Top View with Instrument Upside down188
RF Oscillator Output Power Adjustment189
RF Oscillator Output Power Adjustment Test Setup189
FM Linearity Adjustment (Alternate)190
FM Linearity Adjustment (Alternate) Test Setup191
- Replaceable Parts193
Abbreviations193
Exchange Assemblies193
Introduction193
Ordering Information193
Replaceable Parts List193
Spare Parts Kit193
Illustrated Parts Breakdowns194
Part Numbers for Exchange Assemblies194
- Illustrated Parts Breakdown194
Reference Designations and Abbreviations195
Replaceable Parts197
- A26A4)228
Cabinet Parts232
Type N Connector233
Code List of Manufacturers234
- Manual Changes235
Introduction235
Manual Changes by Serial Number235
Summary of Changes by Component236
Manual Change Instructions244
A8A2 Counter/Lock Board Assembly Backdating (Change B)246
A3A4 Connector Board Assembly Backdating (Change C)247
A26A1 Power Amplifier and AGC Detector Assembly Backdating (Change D)248
A26A2U1 Backdating (Change E)251
A8A1 RF Scaler Assembly Backdating (Change E)252
A12 Rectifier Assembly Backdating (Change F)253
A8A1 RF Scaler Assembly Component Locations265
A22 +20V and -20V Regulator Assembly Component Locations267
A26A1 Power Amplifier and AGC Detector Assembly Component Locations273
A4 Meter/Annunciator Drive Assembly278
P/O A8A2 Counter/Lock Board Assembly Component281
A12 Rectifier Assembly Component Locations282
P/O A3A4 Connector Board Assembly Component Location283
P/O A8A2 Counter/Lock Board Assembly Component Locations287
- Component Locations294
  - Component Locations295
FM Amplifiers Schematic Diagram296
FM Shaping Circuits and Phase Lock Loop Filter Schematic Diagram298
- Component Locations299
Over-Deviation Detector and Meter Control Circuits Schematic Diagram301
A8A2 Counter/Lock Board Assembly Improvements (Serial Prefix 1229A)312
Elimination of Frequency Shift in Expand X100 Mode (Serial Prefix 1229A)312
Improved FM Metering Accuracy (Serial Prefix 1229A)312
Instrument Improvement Modifications312
A8A4 Counter Display Assembly Modification313
A26A1 Power Amplifier and AGC Detector Assembly Improvement (Serial Prefix 1229A)314
Fixed-Frequency Modulation Oscillator (All, A13)314
Improved Audio Output Level Accuracy (Serial Prefix 1229A)314
Reduction of RFI Leakage from Front Panel (Serial Prefix 1244A and Below)314
A26A4 AGC Amplifier Assembly Improvement (Serial Prefix 1245A and Below)315
Reduction of RFI Leakage from RF Oscillator (Serial Prefix 1246A and Below)315
Replacement A7 FM Shaping Assembly (Serial Prefix 1246A and Below)315
Replacement A9 Peak Deviation and Range Switch Assembly (Serial Prefix 1246A and Below)315
- Prefix 1249A)317
A5 FM Amplifier Assembly Improvement (Serial Prefix 125La and Below)317
A8A2 Counter/Lock Board Assembly Improvement317
- (Serial Prefix 1251A and Below)317
Front Panel Meter M1 Replacement (Serial Prefix 125La and Below)317
A26 AM/AGC and RF Amplifier Assembly Improvement318
A26A4 AGC Amplifier Assembly Improvement318
A10A2 RF Divider Assembly Improvement (Serial Prefix 1313A and Below)319
A10A2 RF Divider Assembly Improvement (Serial Number Prefixes 1333A and Below)320
A10A2 RF Divider Assembly Improvement (Serial Numbers 1316A00464 and Below)320
A8A4 Counter Display Assembly Improvement320
Improved Audio Output Level Flatness (Serial Prefixes 1244A through 1316A)320
Improved FM Bandwidth on 5Khz Deviation Range320
Improved Noise Performance (Serial Prefixes 1327A and Below)320
Power Supply Improvement (Serial Prefix 1313A and Below)320
A18, A20, and A22 Power Supply Regulator321
Time Base Vernier and Pot Replacement (Serial Prefix 1333A and Below)321
All Variable Frequency Modulation Oscillator (Option 001) Improvement (Serial Number Prefixes 1350A and Below)322
Improvement in Lock Acquisition Capability (Serial Number Prefixes 1350A and Below)322
Line Switch Modification (Serial Number Prefixes 1406A and Below)322
Regulator Improvement (Serial Number Prefixes 1405A and Below)322
Reliability Improvements in am and Pulse Circuits (Serial Number Prefixes 1345A and Below)322
REDUCE PEAK POWER" Lamp Drive Modification (Serial Number Prefix 1526A and Below)323
- Service325
Reduction in Popcorn Noise on Power Supplies (Serial Number Prefixes 1406A and Below)323
- Operation (Serial Number Prefixes 1423A and Below)323
Introduction325
Principles of Operation325
Recommended Test Equipment325
Schematic Diagram Notes325
Service Aids325
Troubleshooting325
Signal Generator with Circuit Boards on Extenders326
Component Replacement327
Etched Circuits327
Etched Conductor Repair327
Factory Selected Components327
Repair327
Etched Circuit Soldering Equipment328
Examples of Diode and Transistor Marking Methods328
Basic Circuit Theory329
Binary Circuits and Symbols329
Illustrated Parts Breakdowns329
Binary Symbols330
Logic Levels330
D Flip-Flop331
Schmitt Trigger331
Triggered Flip-Flop331
Binary Latch332
Binary Registers332
Binary Shift Register332
Multiple Input J/K Flip-Flop332
Binary Latch333
Binary Shift Register333
Decade Counters and Symbols333
Programmable Counter334
Linear Integrated Circuits335
Programmable Up/Down Counter336
Operational Amplifier337
Assembly Information Index338
Comparator338
- Service Sheets338
- Schematic Diagram339
Overall Block Diagram343
Overall Block Diagram344
FM Circuits and RF Oscillator Block Diagram345
FM Circuits and RF Oscillator Troubleshooting346
AM/AGC Circuits and Output Amplifier Block Diagram347
AM/AGC Circuits and Output Amplifier Troubleshooting348
Counter/Lock Circuits Block Diagram349
Counter/Lock Circuits Troubleshooting350
RF Oscillator Simplified Diagram351
P/O A3A4 Connector Board Assembly Component Locations352
P/O A9 Peak Deviation and Range Switch Assembly352
- Component Locations352
A5 FM Amplifier Assembly Component Locations353
P/O A9 Peak Deviation and Range Switch Assembly Component Locations353
P/O A7 FM Shaping Assembly Component Locations357
A11 Variable-Frequency Modulation Oscillator361
Variable-Frequency Modulation Oscillator (Option 001) Schematic Diagram361
A10A1 RF Filter Assembly Component Locations362
- Variable-Frequency Modulation Oscillator for Option362
RF Filters (A10Al)362
RF Dividers (A10A2)364
AM Preamplifier (A13, A26A2)370
RF Amplifier, Pulse Switching, and Step Attenuator (A1, A26A1, A26A2)370
AM Interconnections and RF ON/OFF Switch Schematic Diagram373
AM Interconnections and RF ON/OFF Switch (A9, A26)374
RF Vernier Schematic Diagram375
A2 Meter Switch/Detector Assembly Component Location376
Meter Drive Amplifier Data376
RF Vernier (A1A1, A26)376
Meter Circuits Schematic Diagram377
P/O A6 Annunciator Assembly Component Locations377
Meter Circuits (A2, A4, A6)378
Counter RF Scaler Schematic Diagram379
P/O A8A3 Time Base Assembly Component Locations379
Count Modes of Counter A8A3U15380
Count Modes of Counters A8A3U13 and U14380
Counter RF Scaler (A8A1, A8A3)380
Data Inputs of Decimal Point Shift Register380
Total Count of Time Base Reference Counters U13, U14, and U15380
Counter Time Base Schematic Diagram381
P/O A8A3 Time Base Assembly Component Locations381
Counter Time Base (A8A3, A9)382
A8A4 Counter Display Assembly Component Locations (P/O A8)383
Up/Down Counter and Display Schematic Diagram383
Counter Phase Lock Circuits (A8A2)384
Up/Down Counter and Display (A8A2, A8A4)384
Counter Phase Lock Circuits Schematic Diagram385
Current Foldback386
Power Supply Circuits Schematic Diagram387
Power Supply Circuits (A12, A14, A20, A22)388
- Regulator and Fan Circuits (A16, A18)390
A17 Power Supply Mother Board Assembly Component Locations391
Power Supply Mother Board Schematic Diagram391
A13 Modulation/Metering Mother Board Assembly Component Locations392
Power Supply Mother Board (A17)392
Modulation/Metering Mother Board (A13)394
A1 Output Level Assembly Illustrated Parts Breakdown395
- Al Assembly Removal and Disassembly396
- A8 Assembly Removal and Disassembly396
A9 Peak Deviation and Range Switch Assembly Illustrated Parts Breakdown399
- A9 and All Assemblies Removal and Disassembly400
- A10 Assembly Removal and Disassembly400
A10 Divider/Filter Assembly Illustrated Parts Breakdown401
A26 AM/AGC and RF Amplifier Illustrated Parts Breakdown403
Bottom Internal Views (Option 001 Shown)406

artisan 8640B - Page 367

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