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UNI-T UT105

UNI-T UT105
56 pages
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Table of Contents
Title Page
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
Automotive Servicing Safety Guide
International Electrical Symbols
The Meter Structure
Rotary Switch
Functional Buttons
Display Symbols
Measurement Operation
Part 1 Multimeter Basic Testing
A. AC and DC Voltage Testing
B. DC Current Testing
C. Resistance Testing
D. Diode Testing
E. Continuity Testing
F. Dwell Testing
G. Engine Tach (Rotation Speed)
Testing “RPMx10”
H. Data Holding
Part 2 Diagnosis of Automotive Troubles
A. Fuse Testing: Check the fuse to
see if it is blown out.
B. Switch Testing: Check the switch
to see if it can work correctly.
C. Solenoid or Relay Testing
D. Starting/Charging System Testing
E. Battery Power Consumption Testing
when the Engine Is off
F. Trigger Voltage Battery Load Testing
G. Voltage Drop Testing
Model UT105: OPERATING MANUAL
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Table of Contents

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UNI-T UT105 Specifications

General IconGeneral
Product typeDigital multimeter
AC voltage range2 - 750 V
DC current range0.2 - 10 A
DC voltage range0.2 - 1000 V
Dimensions (WxDxH)88 x 39 x 179 mm
Battery voltage9 V
Weight and Dimensions IconWeight and Dimensions
Weight352 g

Summary

Safety Information

Rules For Safe Operation

Rules For Safe Operation Part 1

Essential safety rules for operating the meter, covering case inspection, test leads, and voltage limits.

Rules For Safe Operation Part 2

Continued safety guidelines on servicing, cleaning, battery handling, and environmental conditions.

Automotive Servicing Safety Guide

Automotive Servicing Safety Guide Part 1

Safety precautions for working on vehicles, including air bags, ventilation, and tool placement.

Automotive Servicing Safety Guide Part 2

Procedures for connecting/cutting off components and general advice on visual inspection before diagnostics.

Automotive Servicing Safety Guide Part 3

Further checks for ignition leads, vacuum hoses, leads, and circuit connections during automotive servicing.

Rotary Switch Functions

Functional Button Operations

Display Symbols

Measurement Operation: Part 1 - Basic Testing

Measurement Operation: Part 2 - Diagnosis of Automotive Troubles

Fuse Testing

Procedure to check if a fuse is blown out by measuring its resistance.

Switch Testing

Method to test if a switch is working correctly by checking resistance when connected and disconnected.

Solenoid or Relay Testing

Procedure for testing the impedance of solenoids or relay coils, noting potential limitations.

StartingCharging System Testing

Overview of testing engine starting and charging systems, highlighting the multimeter's role.

Battery Power Consumption Testing

Test battery power consumption with the engine off to identify additional current draw.

Trigger Voltage Battery Load Testing

Test the battery's ability to provide adequate voltage upon engine start.

Voltage Drop Testing

Test voltage drops across components to diagnose issues affecting engine start.

Ignition System Testing

Fuel System and Engine Sensor Testing

Maintenance

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