UNI-T UT501, UT502 Operating Manual

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UT501/UT502 OPERATING MANUAL

Table of Contents

Title Page

Introduction
Unpacking the Meter
Safety Information
International Electrical Symbols
The Meter Structure
Key Functions
Rotary Switch

Measurement Operation

A. Measuring Voltages
B. Measuring Insulation Resistance

4
4

6
11
12
14
15
16
16
18

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UT501/UT502 OPERATING MANUAL

Maintenance

A. General Service
B. Replacing the Battery

Specifications

Safety and Compliances
Physical Specifications
General Specifications
Feature Summary
Detailed Accuracy Specifications
A. Voltage Measurement
B. UT501: Insulation Resistance Measurement
UT502: Insulation Resistance Measurement

21
21
23
25
25
26
27
27
28
28
29
30

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UT501/UT502 OPERATING MANUAL

List of Tables

Table Title Page

1. Unpacking Inspection

2. International Electrical Symbols

3. Meter Front Description

4. Key Description

5. Rotary Switch Description

List of Figures

Figure Title Page

1. The Meter Front Structure

2. Voltages Measurement

3. Insulation Resistance Measurement

4. Battery Replacement

5
11
13
14
15

12
16
18
23

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UT501/UT502 OPERATING MANUAL

Introduction

Uni-Trend Model UT501 and UT502 insulation resistance tester (hereafter, "the Meter")
is a handheld instrument designed primarily to make resistance/ insulation resistance,
DC/AC Voltage measurement.

Unpacking the Meter

The Meter includes the following items:

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UT501/UT502 OPERATING MANUAL

Table 1. Unpacking Inspection

Description

English Operating Manual
Test Lead
Test probe
Alligator clip
Carry bag
Strap

1.5V Battery (LR14)

Item

1
2
3
4
5
6
5

Qty

1 piece

1 set
1 set

1 set
1 piece
1 piece

6 pieces

In the event you find any missing or damage, please contact your dealer immediately.

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UT501/UT502 OPERATING MANUAL

Safety Information

This Meter complies with the standards IEC61010 -1 safety measurement requirement:
in pollution degree 2, overvoltage category (CAT. III 600V, CAT.II 1000V) and double
insulation.

CAT II: Local level, appliance, portable equipment etc., with smaller transient voltage
overvoltages than CAT. III
CAT III: Distribution level, fixed installation, with smaller transient over voltages than
CAT. IV

Use the Meter only as specified in this operating manual, otherwise the protection
provided by the Meter may be impaired.

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UT501/UT502 OPERATING MANUAL

Danger identifies conditions and actions that pose hazard(s) to the user.
Warning identifies avoiding electric shock.
Caution identifies conditions and actions that may damage the Meter and carrying
out accurate measurement.

International electrical symbols used on the Meter and in this Operating Manual are
explained on page 11.

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UT501/UT502 OPERATING MANUAL

Danger
Use of instrument in a manual not specifed by the manufactuer may impair
safety features/protection provided by the equipment. Read the following safety
information carefully before using or servicing the instrument.
Do not apply more than 1000V DC or 750V AC.
Do not use the Meter around explosive gas, vapor or dust.
Do not use the Meter in a wet environment.
When using the test leads, keep your figures away from the lead contacts.
Keep your figures behind the finger guards on the leads.
Do not use the Meter with any parts or cover removed.
When carrying out insulation measurement, do not contact the circuit
under test.

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UT501/UT502 OPERATING MANUAL

Warning

Do not use the Meter if it is damaged or metal part is exposed. Look for
cracks or missing plastic.
Be careful when working above 30V rms, 46.7V ac rms and 70V DC. Such
voltages pose a shock hazard.
Do not change battery when the Meter is in wet environment.
Place test leads in proper input terminals. Make sure all the test leads
are firmly connected to the Meterís input terminals.
Make sure the Meter is turned off when opening the battery compartment.
Carefully read the operating manual before operating the Meter.
Follow the operating manual all the time when using the Meter and keep
the operating manual in a safe place.
Wrong operation will cause incident and damage to the Meter.

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UT501/UT502 OPERATING MANUAL

Caution

When performing resistance tests, remove all power from the circuit to

be measured and discharge all the power.

When servicing the Meter, use only the same model number or identical
electrical specifications of test leads and power adaptor.
Do not use the Meter if the battery indicator ( ) shows a battery
empty condition. Take the battery out from the Meter if it is not used
for a long time.
Do not use or store the Meter in an environment of high temperature,
humidity, explosive, inflammable and strong magnetic field. The

performance of the Meter may deteriorate after dampened.