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123
Industrial ScopeMeter
Service Manual
4822 872 05375
August 1997, Rev. 3, 01/00
© 1997 Fluke Corporation. All rights reserved. Printed in the Netherlands
All product names are trademarks of their respective companies.
SERVICE CENTERS
To locate an authorized service center, visit us on the World Wide Web:
http://www.fluke.com
or call Fluke using any of the phone numbers listed below:
+1-888-993-5853 in U.S.A. and Canada
+31-402-678-200 in Europe
+1-425-356-5500 from other countries
Table of Contents
Chapter
Title
Page
1
Safety Instructions ............................................................................. 1-1
1.1 Introduction .................................................................................................
1-3
1.2 Safety Precautions.......................................................................................
1-3
1.3 Caution and Warning Statements................................................................
1-3
1.4 Symbols.......................................................................................................
1-3
1.5 Impaired Safety ...........................................................................................
1-4
1.6 General Safety Information.........................................................................
1-4
2
Characteristics ................................................................................... 2-1
2.1 Introduction .................................................................................................
2-3
2.2 Dual Input Oscilloscope..............................................................................
2-3
2.2.1 Vertical ................................................................................................
2-3
2.2.2 Horizontal ............................................................................................
2-4
2.2.3 Trigger .................................................................................................
2-4
2.2.4 Advanced Scope Functions..................................................................
2-5
2.3 Dual Input Meter .........................................................................................
2-5
2.3.1 Input A and Input B .............................................................................
2-5
2.3.2 Input A .................................................................................................
2-8
2.3.3 Advanced Meter Functions..................................................................
2-8
2.4 Miscellaneous .............................................................................................
2-9
2.5 Environmental .............................................................................................
2-10
2.6 Service and Maintenance ............................................................................
2-11
2.7 Safety ..........................................................................................................
2-11
2.8 EMC Immunity ...........................................................................................
2-12
3
Circuit Descriptions ........................................................................... 3-1
3.1 Introduction .................................................................................................
3-3
3.2 Block Diagram ............................................................................................
3-3
3.2.1 Channel A, Channel B Measurement Circuits.....................................
3-4
3.2.2 Trigger Circuit .....................................................................................
3-4
3.2.3 Digital Circuit ......................................................................................
3-5
3.2.4 Power Circuit .......................................................................................
3-6
3.2.5 Start-up Sequence, Operating Modes ..................................................
3-7
123
Service
Manual
3.3 Detailed Circuit Descriptions......................................................................
3-9
3.3.1 Power Circuit .......................................................................................
3-9
3.3.2 Channel A - Channel B Measurement Circuits ...................................
3-15
3.3.3 Trigger Circuit .....................................................................................
3-20
3.3.4 Digital Circuit ......................................................................................
3-25
4
Performance Verification ................................................................... 4-1
4.1 Introduction .................................................................................................
4-3
4.2 Equipment Required For Verification ........................................................
4-3
4.3 How To Verify ............................................................................................
4-3
4.4 Display and Backlight Test .........................................................................
4-4
4.5 Input A and Input B Tests ...........................................................................
4-5
4.5.1 Input A and B Base Line Jump Test ....................................................
4-6
4.5.2 Input A Trigger Sensitivity Test ..........................................................
4-7
4.5.3 Input A Frequency Response Upper Transition Point Test .................
4-8
4.5.4 Input A Frequency Measurement Accuracy Test ................................
4-8
4.5.5 Input B Frequency Measurement Accuracy Test ................................
4-9
4.5.6 Input B Frequency Response Upper Transition Point Test .................
4-10
4.5.7 Input B Trigger Sensitivity Test ..........................................................
4-10
4.5.8 Input A and B Trigger Level and Trigger Slope Test..........................
4-11
4.5.9 Input A and B DC Voltage Accuracy Test ..........................................
4-14
4.5.10 Input A and B AC Voltage Accuracy Test ........................................
4-15
4.5.11 Input A and B AC Input Coupling Test .............................................
4-16
4.5.12 Input A and B Volts Peak Measurements Test ..................................
4-17
4.5.13 Input A and B Phase Measurements Test ..........................................
4-18
4.5.14 Input A and B High Voltage AC/DC Accuracy Test.........................
4-19
4.5.15 Resistance Measurements Test ..........................................................
4-20
4.5.16 Continuity Function Test ...................................................................
4-21
4.5.17 Diode Test Function Test ..................................................................
4-22
4.5.18 Capacitance Measurements Test .......................................................
4-22
4.5.19 Video Trigger Test.............................................................................
4-23
5
Calibration Adjustment ...................................................................... 5-1
5.1 General ........................................................................................................
5-3
5.1.1 Introduction..........................................................................................
5-3
5.1.2 Calibration number and date................................................................
5-3
5.1.3 General Instructions.............................................................................
5-3
5.2 Equipment Required For Calibration..........................................................
5-4
5.3 Starting Calibration Adjustment .................................................................
5-4
5.4 Contrast Calibration Adjustment ................................................................
5-6
5.5 Warming Up & Pre-Calibration ..................................................................
5-7
5.6 Final Calibration .........................................................................................
5-7
5.6.1 HF Gain Input A&B ............................................................................
5-7
5.6.2 Delta T Gain, Trigger Delay Time & Pulse Adjust Input A................
5-9
5.6.3 Pulse Adjust Input A (firmware V01.00 only) ....................................
5-10
5.6.4 Pulse Adjust Input B............................................................................
5-11
5.6.5 Gain DMM (Gain Volt) .......................................................................
5-11
5.6.6 Volt Zero..............................................................................................
5-13
5.6.7 Zero Ohm (firmware V01.00 only)......................................................
5-13
5.6.8 Gain Ohm.............................................................................................
5-14
5.6.9 Capacitance Gain Low and High .........................................................
5-15
5.6.10 Capacitance Clamp & Zero................................................................
5-15
5.6.11 Capacitance Gain ...............................................................................
5-16
5.7 Save Calibration Data and Exit...................................................................
5-16
Contents
(continued)
6
Disassembling the Test Tool ............................................................. 6-1
6.1. Introduction ................................................................................................
6-3
6.2. Disassembling Procedures .........................................................................
6-3
6.1.1 Required Tools ....................................................................................
6-3
6.2.2 Removing the Battery Pack .................................................................
6-3
6.2.3 Removing the Bail ...............................................................................
6-3
6.2.4 Opening the Test Tool .........................................................................
6-3
6.2.5 Removing the Main PCA Unit.............................................................
6-5
6.2.6 Removing the Display Assembly.........................................................
6-6
6.2.7 Removing the Keypad and Keypad Foil..............................................
6-6
6.3 Disassembling the Main PCA Unit .............................................................
6-6
6.4 Reassembling the Main PCA Unit ..............................................................
6-8
6.5 Reassembling the Test Tool........................................................................
6-8
7
Corrective Maintenance ..................................................................... 7-1
7.1 Introduction .................................................................................................
7-3
7.2 Starting Fault Finding. ................................................................................
7-4
7.3 Charger Circuit............................................................................................
7-4
7.4 Starting with a Dead Test Tool ...................................................................
7-6
7.4.1 Test Tool Completely Dead.................................................................
7-6
7.4.2 Test Tool Software Does not Run. ......................................................
7-7
7.4.3 Software Runs, Test Tool not Operative .............................................
7-7
7.5 Miscellaneous Functions.............................................................................
7-8
7.5.1 Display and Back Light .......................................................................
7-8
7.5.2 Fly Back Converter ..............................................................................
7-9
7.5.3 Slow ADC............................................................................................
7-10
7.5.4 Keyboard..............................................................................................
7-11
7.5.5 Optical Port (Serial RS232 Interface)..................................................
7-11
7.5.6 Channel A, Channel B Voltage Measurements ...................................
7-12
7.5.7 Channel A Ohms and Capacitance Measurements ..............................
7-13
7.5.8 Trigger Functions.................................................................................
7-14
7.5.9 Reference Voltages..............................................................................
7-15
7.5.10 Buzzer Circuit ....................................................................................
7-15
7.5.11 Reset ROM Circuit (PCB version <8 only).......................................
7-16
7.5.12 RAM Test ..........................................................................................
7-16
7.5.13 Power ON/OFF ..................................................................................
7-16
7.5.14 PWM Circuit......................................................................................
7-17
7.5.15 Randomize Circuit .............................................................................
7-17
7.6 Loading Software ........................................................................................
7-17
8
List of Replaceable Parts................................................................... 8-1
8.1 Introduction .................................................................................................
8-3
8.2 How to Obtain Parts ....................................................................................
8-3
8.3 Final Assembly Parts ..................................................................................
8-4
8.4 Main PCA Unit Parts ..................................................................................
8-6
8.5 Main PCA Parts ..........................................................................................
8-7
8.6 Accessory Replacement Parts .....................................................................
8-24
8.7 Service Tools...............................................................................................
8-24
9
Circuit Diagrams................................................................................. 9-1
9.1 Introduction .................................................................................................
9-3
9.2 Schematic Diagrams....................................................................................
9-4
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