FLUKE 6080a-an_rf- 电路图.pdf

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1、6080A/AN SYNTHESIZED SIGNAL GENERATOR Service Manual P/N 868906 October 1989 1989, John Fluke Mfg. Co. Inc. All rights reservedPO Box C9090 Everett WA 98206 RadioFans.CN 收音机爱 好者资料库 WARRANTY The JOHN FLUKE MFG. CO., INC warrants each instrument it manufactures to be free from defects in material and

2、workmanship under normal use for 2 years from the date of purchase. This warranty extends only to the original purchaser. This warranty shall not apply to fuses, disposable batteries, or any product or parts that have been subject to misuse, neglect, accident, or abnormal conditions of operation. In

3、 the event of failure of a product covered by this warranty, JOHN FLUKE MFG. CO., INC will repair and calibrate an instrument returned to an authorized Service Center within 2 years of the original purchase; provided the warrantors examination discloses to its satisfaction that the product was defec

4、tive. The warrantor may, at its option, replace the product in lieu of repair. With regard to any instrument returned within 2 years of the original purchase, said repairs or replacement will be made without charge. If the failure has been caused by misuse, neglect, accident, or abnormal conditions

5、of operation, repairs will be billed at a nominal cost. In such case, an estimate will be submitted before work is stated if requested. If any failure occurs, the following steps should be taken: 1. Notify the JOHN FLUKE MFG. CO., INC or nearest Service Center, giving full details of the difficulty.

6、 Include the model number, type number, and serial number. On receipt of this information, service data or shipping instructions will be forwarded to you. 2. On receipt of the shipping instructions, forward the instrument, transportation prepaid. Repairs will be made at the Service Center and the in

7、strument will be returned prepaid. SHIPPING TO MANUFACTURER FOR REPAIR OR ADJUSTMENT All shipment of JOHN FLUKE MFG. CO., INC instruments should be shipped in the original packing carton (if available). If the original carton is not available, use any suitable container that is rigid and of adequate

8、 size. If a substitute container is used, the instrument should be wrapped in paper and surrounded with at least four inches of shock-absorbing material. RadioFans.CN 收音机爱 好者资料库 Table of Contents SECTION TITLE PAGE 1 INTRODUCTION AND SPECIFICATIONS 1-1 1-1. INTRODUCTION 1-1 1-2. UNPACKING THE SIGNAL

9、 GENERATOR 1-1 1-3. SAFETY 1-2 1-4. ACCESSORIES 1-3 1-5. SIGNAL GENERATOR SPECIFICATIONS 1-3 2 THEORY OF OPERATION 2-1 2-1. INTRODUCTION 2-1 2-2. GENERAL DESCRIPTION 2-1 2-3. Front Panel Section 2-2 2-4. Upper/Lower Module Sections 2-2 2-5. Rear Panel Section 2-2 2-6. FUNCTIONAL DESCRIPTION 2-2 2-7.

10、 Frequency 2-2 2-8. Frequency Modulation 2-4 2-9. Phase Modulation 2-4 2-10. Output/Level Control 2-5 2-11. Amplitude Modulation 2-5 2-12. Pulse Modulation 2-5 2-13. Internal Modulation Oscillator 2-6 2-14. Power Supply Description 2-6 2-15. DIGITAL CONTROLLER SOFTWARE DESCRIPTION 2-6 2-16. User Int

11、erface 2-6 2-17. Calibration/Compensation Memory 2-7 2-18. Self-Test 2-7 2-19. Status Signals 2-7 3 CLOSED-CASE CALIBRATION 3-1 3-1. INTRODUCTION 3-1 3-2. Front Panel Calibration 3-2 3-3. Remote Calibration 3-2 3-4. Calibration Data 3-3 3-5. AM CALIBRATION 3-4 3-6. Front Panel AM Calibration Procedu

12、re 3-4 3-7. Remote AM Calibration Procedure 3-6 i(continued on page ii) RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS, continued SECTION TITLE PAGE 3-8. FM CALIBRATION 3-7 3-9. Front Panel FM Calibration Procedure 3-8 3-10. Remote FM Calibration 3-9 3-11. RF LEVEL CALIBRATION 3-10 3-12. Front Panel Leve

13、l Calibration Procedure 3-11 3-13. Remote Level Calibration Procedure 3-13 3-14. REFERENCE OSCILLATOR CALIBRATION 3-14 3-15. Front Panel Reference Oscillator Calibration Procedure 3-15 3-16. Remote Reference Oscillator Calibration Procedure 3-16 4 PERFORMANCE TESTS 4-1 4-1. INTRODUCTION 4-1 4-2. TES

14、T EQUIPMENT 4-1 4-3. POWER-ON TEST 4-4 4-4. FREQUENCY ACCURACY TEST 4-5 4-5. SYNTHESIS TEST 4-5 4-6. HIGH-LEVEL ACCURACY TEST 4-6 4-7. MID-LEVEL ACCURACY TEST 4-8 4-8. LOW-LEVEL ACCURACY TEST 4-9 4-9. ALTERNATE-LEVEL ACCURACY TEST 4-10 4-10. FLATNESS TEST 4-13 4-11. OUTPUT LEAKAGE TEST 4-14 4-12. HA

15、RMONIC AND LINE-RELATED SPURIOUS TEST 4-15 4-13. PHASE NOISE AND NON-HARMONIC SPURIOUS TESTS 4-16 4-14. MODULATION TESTS 4-17 4-15. VOLTAGE STANDING-WAVE RATIO (VSWR) TESTS 4-23 4-16. PULSE TESTS 4-24 5 ACCESS PROCEDURES 5-1 5-1. INTRODUCTION AND SAFETY 5-1 5-2. LOCATION OF MAJOR ASSEMBLIES 5-3 5-3.

16、 ACCESS INSTRUCTIONS 5-3 5-4. Removing the Front Panel Section 5-3 5-5. Removing the Rear Panel Section 5-3 5-6. Removing the A2 Coarse Loop PCA 5-4 5-7. Removing the A3 Sub-Synthesizer VCO PCA 5-4 5-8. Removing the A4 Sub-Synthesizer PCA 5-5 5-9. Removing the A5 Coarse Loop VCO PCA 5-5 5-10. Removi

17、ng the A6 Mod Oscillator PCA 5-5 5-11. Removing the A8 Output PCA 5-5 5-12. Removing the A9 Sum Loop VCO PCA 5-6 5-13. Removing the A10 Premodulator PCA 5-6 5-14. Removing the A11 Modulation Control PCA 5-6 5-15. Removing the A12 Sum Loop PCA 5-7 5-16. Removing the A13 Controller PCA 5-7 5-17. Remov

18、ing the A14 FM PCA 5-8 5-18. Removing the A20 Attenuator/RPP Assembly 5-8 5-19. Removing the A22 Delay Cable Assembly 5-8 ii(continued on page iii) TABLE OF CONTENTS, continued SECTION TITLE PAGE 6 CIRCUIT DESCRIPTIONS, TROUBLESHOOTING, AND ALIGNMENT 6-1 6-1. INTRODUCTION 6-1 6-2. MODULE REPLACEMENT

19、 6-4 6-3. A1 Display PCA 6-5 6-4. A2 Coarse Loop PCA 6-5 6-5. A3 Sub-Synthesizer PCA 6-5 6-6. A4 Sub-Synthesizer PCA 6-5 6-7. A5 Coarse Loop VCO PCA 6-5 6-8. A6 Mod Oscillator PCA 6-5 6-9. A7 Relay Driver PCA 6-5 6-10. A8Output PCA 6-5 6-11. A9 Sum Loop VCO PCA 6-5 6-12. A10 Premodulator PCA 6-6 6-1

20、3. A11 Modulation Control PCA 6-6 6-14. A12 Sum Loop PCA 6-6 6-15. A13 Controller PCA 6-6 6-16. A14 FM Board PCA 6-6 6-17. A15 Power Supply PCA 6-6 6-18. A19 Switch PCA 6-6 6-19. A20 Attenuator/RPP Assembly (A7, A21, A30) 6-6 6-20. A22 Delay Line Assembly (A25+A26+Delay Cable+Trim Cable) . 6-6 6-21.

21、 UPDATING COMPENSATION MEMORY WITH MODULE EXCHANGE DATA 6-7 6-22. PARTS REPLACEMENT 6-8 6-23. SELF-TEST DESCRIPTION 6-8 6-24. Digital Tests 6-8 6-25. AM Tests 6-9 6-26. FM Tests 6-9 6-27. M Tests 6-9 6-28. DCFM Test 6-10 6-29. Coarse Loop Tests 6-11 6-30. Sub-Synthesizer Tests 6-11 6-31. Sum Loop Te

22、sts 6-11 6-32. RF Output Tests 6-12 6-33. Pulse Modulator Tests 6-12 6-34. Filter Tests 6-12 6-35. STATUS SIGNALS AND STATUS CODES 6-13 6-36. SOFTWARE DIAGNOSTIC FUNCTIONS 6-14 6-37. Digital Control Latch Test 6-14 6-38. Instrument Diagnostic State 6-14 6-39. Set Internal DACs 6-14 6-40. Display Syn

23、thesizer Loop Frequencies 6-15 6A POWER SUPPLY 6A-1 6A-1. POWER SUPPLY BLOCK DIAGRAM 6A-1 6A-2. POWER SUPPLY CIRCUIT DESCRIPTION 6A-1 6A-3. POWER SUPPLY TROUBLESHOOTING 6A-4 6A-4. Troubleshooting Procedure 6A-4 6A-5. POWER SUPPLY ADJUSTMENT PROCEDURE 6A-5 iii(continued on page iv) TABLE OF CONTENTS,

24、 continued SECTION TITLE PAGE 6B DIGITAL CONTROLLER 6B-1 6B-1. DIGITAL CONTROLLER BLOCK DIAGRAM 6B-1 6B-2. DIGITAL CONTROLLER CIRCUIT DESCRIPTION (A13) 6B-1 6B-3. Microprocessor 6B-1 6B-4. Memory 6B-1 6B-5. Memory Control 6B-3 6B-6. Front Panel Interface 6B-3 6B-7. IEEE-488 Interface 6B-3 6B-8. Atte

25、nuator Control Interface 6B-3 6B-9. Module I/O 6B-3 6B-10. Status and Control 6B-4 6B-11. DIGITAL CONTROLLER TROUBLESHOOTING 6B-4 6B-12. RF Control 6B-4 6B-13. Microprocessor Kernel 6B-5 6B-14. Clock 6B-5 6B-15. Power-On Reset 6B-5 6B-16. Unused Microprocessor Inputs 6B-5 6B-17. Bus Error 6B-5 6B-18

26、. Interrupts 6B-5 6B-19. Microprocessor Bus 6B-6 6B-20. Address Decoder 6B-6 6B-21. I/O Diagnostic Tests 6B-7 6B-22. CALIBRATION/COMPENSATION MEMORY 6B-8 6B-23. Calibration/Compensation Memory Status 6B-8 6B-24. Repairing Calibration/Compensation Memory Checksum Errors . 6B-9 6B-25. Calibration/Comp

27、ensation Memory Origin Status 6B-9 6B-26. FRONT PANEL CIRCUIT DESCRIPTION 6B-9 6B-27. Display PCA 6B-10 6B-28. Data Communications 6B-10 6B-29. Display Filament Voltage 6B-10 6B-30. Bright-Digit Effect 6B-10 6B-31. Switchboard Interface 6B-10 6B-32. Remote Footswitch 6B-10 6B-33. Edit Knob Interface

28、 6B-11 6B-34. Display Blanking 6B-11 6B-35. Operate/Standby Selection 6B-11 6B-36. FRONT PANEL TROUBLESHOOTING 6B-11 6B-37. Display and Controls 6B-11 6C FREQUENCY SYNTHESIS 6C-1 6C-1. FREQUENCY FAULT TREE 6C-1 6C-2. SUB-SYNTHESIZER BLOCK DIAGRAM 6C-1 6C-3. SUB-SYNTHESIZER CIRCUIT DESCRIPTION (A4) 6

29、C-1 6C-4. SUB-SYNTHESIZER TROUBLESHOOTING 6C-9 6C-5. SUB-SYNTHESIZER ADJUSTMENTS 6C-13 6C-6. Steering DAC Full Scale Adjustment 6C-13 6C-7. Lower Clamp Adjustment, R99 6C-13 6C-8. Upper Clamp Adjustment, R98 6C-14 6C-9. SSB Mixer LO Drive Adjustment, R106 6C-14 6C-10. 10-kHz Notch Adjustment, L56 6C

30、-15 IV(continued on page v) TABLE OF CONTENTS, continued SECTION TITLE PAGE 6C-11. SUB-SYNTHESIZER VCO (A3) CIRCUIT DESCRIPTION 6C-16 6C-12. SUB-SYNTHESIZER VCO TROUBLESHOOTING 6C-16 6C-13. COARSE LOOP CIRCUIT DESCRIPTION (A2) 6C-17 6C-14. REFERENCE SECTION BLOCK DIAGRAM 6C-17 6C-15. COARSE LOOP BLO

31、CK DIAGRAM 6C-20 6C-16. COARSE LOOP TROUBLESHOOTING 6C-22 6C-17. COARSE LOOP PCA ADJUSTMENTS 6C-26 6C-18. Discriminator Video Amplifier Offset Adjustment, R102 6C-26 6C-19. Steering Gain Adjustment, R221 6C-28 6C-20. Acquisition Oscillator Level Adjustment, R227 6C-28 6C-21. 40-MHz Oscillator Adjust

32、ment, L601 6C-28 6C-22. 80-MHz Filter Tuning, L612 and L613 6C-29 6C-23. 80-MHz Level Adjustment, R617 6C-30 6C-24. 2-MHz Notch Adjustment, L205 6C-30 6C-25. Alternate Reference Frequency Selection 6C-31 6C-26. COARSE LOOP VCO (A5) CIRCUIT DESCRIPTION 6C-31 6C-27. COARSE LOOP VCO TROUBLESHOOTING 6C-

33、32 6C-28. SUM LOOP BLOCK DIAGRAM 6C-32 6C-29. SUM LOOP (A12) CIRCUIT DESCRIPTION 6C-34 6C-30. RF Section 6C-34 6C-31. Audio Section 6C-35 6C-32. SUM LOOP TROUBLESHOOTING 6C-38 6C-33. SUM LOOP ASSEMBLY ADJUSTMENTS 6C-41 6C-34. Steering Level Adjustment, R112 6C-41 6C-35. Buffer Gain Match Adjustment,

34、 R121 6C-42 6C-36. FM Null Adjustment, R116 6C-42 6C-37. Loop Gain Adjustment, R167 6C-43 6C-38. Acquisition Oscillator Level Adjustment, R132 6C-44 6C-39. SUM LOOP VCO (A9) CIRCUIT DESCRIPTION 6C-44 6C-40. SUM LOOP VCO TROUBLESHOOTING 6C-45 6D RF LEVEL/AM 6D-1 6D-1. RF LEVEL FAULT TREE 6D-1 6D-2. R

35、F LEVEL BLOCK DIAGRAM 6D-1 6D-3. RF LEVEL CIRCUIT DESCRIPTION 6D-3 6D-4. RF Path 6D-3 6D-5. Leveling Loop 6D-5 6D-6. Level Control 6D-6 6D-7. RF LEVEL TROUBLESHOOTING 6D-6 6D-8. Unleveled Condition 6D-8 6D-9. Output Assembly Test Point Signal Information 6D-9 6D-10. RF LEVEL ADJUSTMENTS 6D-10 6D-11.

36、 Mod Control PCA Level DAC Offset Adjustment, R23 6D-10 6D-12. Mod Control PCA AM DAC Offset Adjustment, R8 6D-11 6D-13. Mod Control PCA Detector Offset Adjustment, R28 6D-12 6D-14. Mod Control PCA AM Depth Adjustment, R10 6D-13 6D-15. Mod Control PCA RF Level Adjustment, R20 6D-14 6D-16. Mod Contro

37、l PCA External Modulation Level Indicator Adjustment, R71 6D-15 6D-17. Mod Control PCA Sum Steer Gain Adjustment 6D-15 v (continued on page vi) TABLE OF CONTENTS, continued SECTION TITLE PAGE 6D-18. Output PCA Het Mixer Level Adjustment, R72 6D-16 6D-19. Output PCA Het Level Adjustment, R10 6D-17 6D

38、-20. Premodulator PCA Bandwidth Adjustment, R51 and C7 6D-17 6D-21. Output PCA Q16 Bias Adjustment, R96 6D-18 6D-22. Output PCA Q9 Bias Adjustment, R1 6D-19 6D-23. Output PCA) Gain Flatness Adjustment, C201 6D-19 6D-24. FM Gain Adjustment, R82, on Mod Control PCA 6D-20 6D-25. FM Steer Gain, R101 on

39、Mod Control PCA 6D-20 6D-26. FM INV Balance, R102 on Mod Control PCA 6D-20 6D-27. ATTENUATOR/REVERSE POWER PROTECTION (RPP) 6D-20 6D-28. ATTENUATOR RPP TROUBLESHOOTING 6D-21 6E FREQUENCY AND PHASE MODULATION 6E-1 6E-1. FM/M FAULT TREE 6E-1 6E-2. FM/M BLOCK DIAGRAM 6E-2 6E-3. CIRCUIT DESCRIPTION 6E-2

40、 6E-4. Oscillator Section 6E-2 6E-5. Divider Section 6E-4 6E-6. Phase Detectors, Loop Circuits, and Logic Section 6E-4 6E-7. Modulation Section 6E-7 6E-8. MODULATION CONTROL CIRCUIT DESCRIPTION 6E-10 6E-9. FM Input Voltage Processing 6E-10 6E-10. FM Steer Voltage Generation 6E-10 6E-11. FM Control S

41、ignals Generation 6E-10 6E-12. FM TROUBLE SHOOTING (A14) 6E-11 6E-13. Frequency Check 6E-11 6E-14. Modulation Check 6E-12 6E-15. Input Signals and Control Input Signals Checks 6E-12 6E-16. FM ADJUSTMENTS 6E-13 6E-17. Adjustments on the Modulation Control PCA (A11) 6E-13 6E-18. Alignment of FM PCA (A

42、14) 6E-14 6F INTERNAL MODULATION OSCILLATOR 6F-1 6F-1. MODULATION OSCILLATOR BLOCK DIAGRAM 6F-1 6F-2. INTERNAL MODULATION OSCILLATOR CIRCUIT DESCRIPTION 6F-1 6F-3. Direct Digital Synthesized Wave Generator 6F-1 6F-4. Pulse Generator 6F-3 6F-5. Signal Routing 6F-3 6F-6. MOD OSCILLATOR TROUBLESHOOTING

43、 AND ADJUSTMENTS 6F-4 6F-7. Direct Digital Synthesizer Troubleshooting 6F-4 6F-8. Pulse Generator Troubleshooting 6F-5 7 LIST OF REPLACEABLE PARTS 7-1 TABLE OF CONTENTS 7-1 7-1. INTRODUCTION 7-2 7-2. HOW TO OBTAIN PARTS 7-2 7-3. SERVICE CENTERS 7-3 vi(continued on page vii) TABLE OF CONTENTS, contin

44、ued SECTION TITLE PAGE 8 SCHEMATIC DIAGRAMS 8-1 TABLE OF CONTENTS 8-1 APPENDICES A. INSTRUMENT PRESET STATE A-l B. SPECIAL FUNCTION TABLE B-l C. REJECTED ENTRY ERROR CODES C-l D. OVERRANGE/UNCAL STATUS CODES D-l E. SELF-TEST STATUS CODES E-l F. COMPENSATION MEMORY STATUS CODES F-l G. EXAMPLE CALIBRA

45、TION CONTROLLER PROGRAMS G-l H. COMPENSATION PROCEDURES H-l I. REAR PANEL AUX CONNECTOR PINOUT 1-1 viilviii List of Tables TABLE TITLE PAGE 1-1. Accessories Included with each Signal Generator 1-3 1-2. Optional Accessories 1-3 1-3. 6080A/AN Specifications 1-4 1-4. Typical Signal Generator Performanc

46、e 1-9 2-1. Frequency Coverage Bands 2-3 3-1. Front Panel Controls for AM Calibration Procedure 3-5 3-2. Remote Programming Commands for AM Calibration Procedure 3-7 3-3. Front Panel Controls for FM Calibration Procedure 3-8 3-4. Remote Programming Commands for FM Calibration Procedure 3-10 3-5. Fron

47、t Panel Controls for Level Calibration Procedure 3-12 3-6. Remote Programming Commands for Level Calibration Procedure 3-14 3-7. Front Panel Controls for Reference Oscillator Calibration Procedure 3-15 3-8. Remote Programming Commands for Reference Oscillator Calibration Procedure 3-17 4-1. Recommen

48、ded Test Equipment 4-2 4-2. High-Level Accuracy Test Conditions 4-7 4-3. High-Level Accuracy Test Conditions Sample 4-8 4-4. Modulation Tests Requirements 4-17 4-5. AM Test Conditions 4-19 6-1. Module Exchange Assemblies 6-4 6-2. General Self-Test Results 6-8 6-3. Digital Test Results 6-9 6-4. AM Te

49、st Conditions 6-9 6-5. FM Tests 6-10 6-6. Phase Modulation Test Conditions 6-10 6-7. DC FM Tests 6-10 6-8. Coarse Loop Tests 6-11 6-9. Sub-Synthesizer Tests 6-11 6-10. Sum Loop Tests 6-11 6-11. RF Output Tests 6-12 6-12. Pulse Modulator Tests 6-12 6-13. Filter Tests 6-13 6-14. Status Signals and Codes 6-13 6-15. Parameter Settings of Diagnostic States 6-14 ix (continued on page x) LIST OF TABLES, continued TABLE TITLE PAGE 6A-1. Supplies Provided by Power Supply Assembly 6A-3 6C-1. Sub-Synthesizer PCA Test Points 6C-11 6C-2. A3 Sub-Synthesizer VCO PCA DC Voltages 6C-17 6C-3.