Fluke PM6681 - Page 5

Contents
1 Safety
Instructions
Caution
and Warning Statements
1-2
Grounding
1-2
Disposal
of Hazardous Materials
1-2
Line Voltage
1-2
2
Performance
Check
General
Information
2-2
Required Test Equipment
2-2
Preparations
2-2
Front Panel
Controls
2-2
Power-On
Test
2-2
Internal
Self-Tests
2-2
Keyboard Test
2-3
Short
Form
Specification Test
2-4
Sensitivity
and Frequency Range
2-4
Check
VMAXA/MIN
2-4
Trigger
Indicators
and
Controls
2-4
Trigger level check
2-4
Reference
Oscillators
2-5
Resolution Test
2-5
Rear Input/Output.
2-5
10
MHz OUT
2-5
GATE OPEN
Output
2-5
REFERENCE
IN
2-5
EXT
ARM input
2-6
TRIG
LEVEL
A&B Outputs
2-6
Probe Comp View
2-6
Measuring Functions
2-6
Check on HOLD OFF function
2-7
Options 2-7
Check
on Prescalers
2-7
PM 6681 Performance
Check Report B-1
3 Disassembly
Removing
the Cover.
3-2
Reinstalling the Cover
3-2
Fan 3-3
PM
9621
,
PM
9624 or PM
9625 HF Input ..........
3-3
PM 9678B TCXO
3-3
PM 9690 or PM 9691 Oven
Oscillator
3-4
Reinstalling
the Battery
3-4
Exchange
Procedure
3-4
4
Circuit Descriptions
Block
Diagram Description
4-2
General
4-2
Hardware Functional
Description
4-4
Front
Unit
4-4
LCD
Drivers
4-4
Keyboard
4-4
Main Board
4-5
Input Amplifier A
4-5
Input
Amplifier
B
4-8
Calibration Circuits
4-8
Trigger Level Circuits
4-9
Power Supply
4-10
Counter Circuits
4-12
Oscillator Circuits
4-14
Logical
Circuits
4-16
GPIB Interface
4-18
Analog Output
4-18
Rear
Panel Unit.
4-19
Optional
Units
4-20
HF Inputs
4-20
Test
Routines
4-23
Test
Routines via
AUX MENU Key
4-23
Power-On Tests
4-23
5
Repair
Preventive
Maintenance
5-2
Calibration
5-2
Oscillators
5-2
Battery Replacement
5-3
Troubleshooting
5-4
General
5-4
Quick Troubleshooting
5-4
Where to Start
5-4
Logical Levels
5-4
Required Test Equipment
5-4
Operating Conditions
5-4
introduction
5-4
Running
Test Programs
5-5
Troubleshooting Tree
5-5
Power
Supply (Functional Level
1)
5-6
Oscillator (Functional Level
2)
5-7
Microcontroller (Functional Level
3)
5-8
Microcomputer Kernel (Functional
Level
4a)
5-9
Microcomputer
Kernel (Functional
Level 4b)
5-9
V