UNI-T UT90C User Manual

Table of Contents
Title Page
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
Rotary Switch
Functional Buttons
Display Symbols
Measurement Operation
A. AC & DC Voltage Measurement
B. Measuring Resistance, Diodes,
Continuity & Capacitance
C. Frequency Measurement
D. AC & DC Current Measurement
E. Power Charging
Operation of Hold Mode
The Use of Relative Value Mode
The RESET Button
The SELECT Button
Sleep Mode
General Specifications
Accuracy Specifications
A. AC Voltage
B. DC Voltage
C. Resistance
D. Diode & Continuity
E. Capacitance Test
F. Frequency Test
G. AC Current
H. DC Current
3
4
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12
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Model UT90C: OPERATING MANUAL
1

UNI-T UT90C Specifications

General

Category	Test Equipment
Model	UT90C
Brand	UNI-T
Type	Digital Multimeter
Display	LCD
Data Hold	Yes
Auto Power Off	Yes
Diode	Yes
Continuity Buzzer	Yes
hFE	Yes
Power	9V Battery
AC Voltage	4V/40V/400V/600V
DC Current	400μA/4mA/40mA/400mA/4A/10A ±(0.8%+5)
AC Current	400μA/4mA/40mA/400mA/4A/10A ±(1%+5)
Resistance	400Ω/4kΩ/40kΩ/400kΩ/4MΩ/40MΩ
Capacitance	4nF/40nF/400nF/4μF/40μF
Frequency	10Hz/100Hz/1kHz/10kHz/100kHz/1MHz/10MHz
Temperature	-40°C to 1000°C
Safety Rating	CAT III 600V

Summary

Inspection, Safety Information, and Operation Rules

Safety Information and Warnings

Essential safety information and warnings for meter usage.

Rules for Safe Operation

Key rules to follow for safe operation of the meter.

Device Identification, Symbols, and Controls

Performing Measurement Operations

AC and DC Voltage Measurement

Guides on measuring AC and DC voltage using the meter.

Resistance, Diode, Continuity & Capacitance Measurement

Instructions for measuring resistance, diodes, continuity, and capacitance.

Frequency Measurement Procedure

Procedure for measuring frequency with the meter.

AC and DC Current Measurement

Power Charging Methods

General and Accuracy Specifications

Accuracy Specifications by Measurement Type

Meter Maintenance and Fuse Replacement

General Meter Service and Care

Replacing Meter Fuses