Equipment information:

Fluke PM6685 Frequency counter
Manufacturer:
Fluke
Model: PM6685
Date: 2003
Category: Measurement instruments
Group: Frequency counter
Description: Programmable Frequency Counter
Information:
                                    

These manuals are available for the above equipment:

Fluke -- PM6685 -- Service Manual
File name: Fluke-4781-Manual-Page-1-Picture
Manual Type: Service Manual
Pages: 94
Size: 2.15 Mbytes (2253647 Bytes)
Language: english
Revision:
Manual-ID/Number: 4822 872 20106
Date: May 2003
Quality: Electronic document, no scan, very well readable.
Upload date:
MD5: 5de372f41d3aafac18c32003734a1d48
ed2kID: 95750aa766c0c016b869f3d373046ce9
Downloads: 252 since 05 November 2013
Information:
This is a complementary service manual covering instruments with manufacturing numbers exceeding 840684. The principal
differences are to be found in Chapter 7 and in Chapter 8 due to a major redesign of the main PCB.
Do not dispose of the previous edition, identified by the part number, 4822 872 25012, and the publishing date, June 1996.
You may have to refer to it for information on older instruments as well as options not mentioned here.


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
Fluke-4781-Manual-Page-1-Picture
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