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190 Series III
®
ScopeMeter
Test Tool
Models 190-xxx-III/190M-x-III/MDA-550-III
Service Manual
É
3/2022 (English)
©2022 Fluke Corporation. All rights reserved.
Specifications are subject to change without notice.
All product names are trademarks of their respective companies.

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Summarization of Contents

Introduction
Contact Fluke
Information on how to contact Fluke Corporation for support or product registration.
Safety Information
General safety precautions and guidelines for using the Test Tool.
Specifications
Performance Verification
Procedures to ensure the Test Tool is in proper operating condition.
General Operation Instructions
Reset the Test Tool
Steps to reset the Test Tool to its default settings.
Menu Navigation
Standard Test Tool Setup
Procedure to define and recall a standard Test Tool setup for verification.
Scope Input A, B, C, D Tests
Input A, B, C, D Vertical Accuracy Test
Procedure to test the vertical accuracy of oscilloscope inputs A, B, C, and D.
Input A, B, C, D Trigger Sensitivity Test
Input B trigger sensitivity
Procedure to test the trigger sensitivity for Input B of the Test Tool.
Input C trigger sensitivity
Procedure to test the trigger sensitivity for Input C of the Test Tool.
Input D trigger sensitivity
Procedure to test the trigger sensitivity for Input D of the Test Tool.
Input A AC Voltage Accuracy (HF) and Bandwidth Test
Input B AC Voltage Accuracy (HF) and Bandwidth Test
Test procedure for high frequency AC voltage accuracy and bandwidth of Input B.
Input C AC Voltage Accuracy (HF) and Bandwidth Test
Test procedure for high frequency AC voltage accuracy and bandwidth of Input C.
Input D AC Voltage Accuracy (HF) and Bandwidth Test
Test procedure for high frequency AC voltage accuracy and bandwidth of Input D.
Meter Tests
Meter DC Voltage Accuracy Test
Procedure to test the meter DC voltage measurement accuracy.
Meter AC Voltage Accuracy and Frequency Response Test
Procedure to test AC voltage measurement accuracy and frequency response.
Continuity Function Test
Procedure to test the continuity function of the Test Tool.
Diode Test Function Test
Procedure to test the diode function of the Test Tool.
Ohms Measurements Test
Procedure to test the accuracy of Ohm measurements.
Calibration Adjustment
Calibration Number and Date
Procedure to show the calibration date and number.
General Instructions
General instructions for all calibration steps.
Warming-Up and Pre-Calibration
The initial state of the calibration mode, includes warm-up and pre-calibration steps.
Final Calibration
Procedure for the final calibration steps requiring specific input conditions.
Error Messages
Messages displayed during calibration and their meanings.
Warming-Up 2, Warm-Up Final, and ADC Timing
Specific calibration steps for warming up, final calibration, and ADC timing.
DMM Calibration
Multimeter Meter Zero
Procedure for calibrating the multimeter zero.
Multimeter Volt Gain
Procedure for calibrating the multimeter voltage gain.
Multimeter Ohm Gain
Procedure for calibrating the multimeter ohm gain.
Disassembly and Reassembly Procedures
Required Tools
List of tools required for disassembly and reassembly.
Remove the Tilt Stand, Hang Strap, and Side Strap
Instructions for removing external straps and stands.
Open the Test Tool, Remove the Battery Pack
Steps to open the test tool and remove the battery pack.
How to Access the Top Side of PCA
Procedure to access the top side of the Printed Circuit Assembly.
How to Access the Bottom Side of PCA
Procedure to access the bottom side of the Printed Circuit Assembly.
Access to LCD, Keypad Foil, and Keypad
Procedure to access the LCD, keypad foil, and keypad components.
Parts List
How to Obtain Parts
Information on how to order replacement parts.

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