Fluke PM6685 - Default Chapter; Table of Contents

Contents
1 Safety Instructions
2 Performance Check
General Information .........................2-2
Recommended Test Equipment ................2-2
Front Panel Controls .........................2-2
Short Form Specification Test ..................2-3
Rear Input/Output ...........................2-4
Measuring Functions .........................2-4
Options ...................................2-5
3 Disassembly
Removing the Cover .........................3-2
Reinstalling the Cover ........................3-2
PM9624 (HF Input) ..........................3-2
PM9626B (GPIB Interface) ....................3-3
PM9691 or PM9692 (Oven Oscillator) ...........3-3
4 Circuit Descriptions
Block Diagram Description ....................4-2
General ..................................4-2
Hardware Functional Description ...............4-4
Front Unit .................................4-4
Main Board ................................4-5
Rear Panel Unit ............................4-13
Optional Units .............................4-14
Software Functional Description ..............4-15
Test Routines .............................4-16
5 Repair
Preventive Maintenance.......................5-2
Calibration .................................5-2
When to Replace the Fan
(PM6685R only ) ............................5-3
Troubleshooting .............................5-4
General ...................................5-4
Safety Inspection and Test After Repair .........5-9
General Directives...........................5-9
6 Calibration Adjustments
Introduction ................................6-2
Preparation ................................6-2
Power Supply ..............................6-2
Input Amplifier ..............................6-3
Reference Oscillators ........................6-4
Other Options ..............................6-6
7 Replacement Parts
Introduction ................................7-2
Mechanical Parts............................7-3
Main Board ................................7-6
Front Board ...............................7-12
GPIB Interface (PM9626B) ...................7-13
8 Drawings & Diagrams
How to read the diagrams.....................8-2
9 Appendix
How to Replace Surface Mounted Devices........9-2
Electrostatic discharge .......................9-3
Glossary ..................................9-4
Power Supply Switchmode Module .............9-5
Circuit Descriptions ..........................9-5
Repair ....................................9-6
Calibration Adjustments ......................9-7
Replacement Parts..........................9-8
PM6685R ..................................9-12
Introduction ...............................9-12
Performance Check ........................9-12
Functional Description.......................9-12
Calibration Adjustments .....................9-13
Replacement Parts .........................9-14