Fluke PM6690 Service Manual

Contents
GENERAL INFORMATION.....................III
1 Safety Instructions
Caution and Warning Statements ...............1-2
Grounding .................................1-2
Operation ................................. 1-2
Line Voltage ............................... 1-4
2 Performance Check
General Information ......................... 2-2
Test Equipment............................. 2-2
Preparations ...............................2-2
Front Panel Controls.........................2-2
Short Form Specification Test..................2-4
Rear Inputs/Outputs ......................... 2-6
Measuring Functions.........................2-6
Check of HOLD OFF Function .................2-7
RF Options ................................ 2-7
3 Disassembly
Removing the Cover .........................3-2
Fan...................................... 3-3
Prescaler Options ........................... 3-3
OCXO Options .............................3-4
4 Circuit Descriptions
Version A .................................. 4-3
Block Diagram Description ....................4-4
General ................................... 4-4
Block Diagram .............................4-4
Hardware Functional Description ...............4-6
Front Unit ................................. 4-6
Main Board ................................4-6
Test Routines ............................. 4-10
Version B .................................4-11
Block Diagram Description ...................4-12
General .................................. 4-12
Block Diagram.............................4-12
Hardware Functional Description ..............4-14
Front Unit ................................ 4-14
Main Board ...............................4-14
Test Routines ............................. 4-18
5 Corrective & Preventive Maintenance
Introduction ................................ 5-2
Calibration................................. 5-2
Instructions for Firmware Upgrade ..............5-2
Utility Program .............................5-3
Fan Replacement ...........................5-3
Other Important Information ...................5-3
6 Repair
Version A .................................. 6-3
Troubleshooting.............................6-4
General ................................... 6-4
Power Supply .............................. 6-4
Input Amplifiers .............................6-8
Timebase Reference Circuits .................6-12
Prescalers................................ 6-15
Microprocessor & Memories ..................6-15
Microprocessor Bus & Interfaces ..............6-21
Measuring Logic ...........................6-27
Version B .................................6-31
Troubleshooting............................6-32
General .................................. 6-32
Power Supply ............................. 6-32
Input Amplifiers ............................ 6-36
Timebase Reference Circuits .................6-40
Prescaler................................. 6-43
Microprocessor & Memories ..................6-43
Microprocessor Bus & Interfaces ..............6-49
Measuring Logic ...........................6-55
Safety Inspection and Test After Repair.........6-59
General Directives .........................6-59
7 Calibration Adjustments
Calibration ................................. 7-2
General Principles...........................7-2
The Calibration Submenu .....................7-3
Frequency Reference ........................7-3
Voltage Reference .......................... 7-5
Calibration Subsystem
Command Reference .........................7-6
Adjustments ...............................7-11
Preparations ..............................7-11
Input Amplifiers ............................ 7-12
Power Supply ............................. 7-13
V

Fluke PM6690 Specifications

General

Brand	Fluke
Model	PM6690
Category	Measuring Instruments
Language	English