UNI-T UT253A, UT253B Operating Manual

P/N:110401103625
DATE:2018.06.26
REV.3

Contents

TITLE PAGE
Warnings 2
I. Introduction 4
II. Model Comparison 5
III. Electrical Symbols 6
IV. Technical Specifications 7
V. Meter Description 10
VI. Operating Instructions 12

1. Power On/Off 12

2. Backlight Control 12

3. Data Hold and Save 12

4. Data Access and Exit 13

5. Data Transmission to PC 13

6. Data Delete 14

7. Leakage Current, Current and Voltage Measurements 14
VII. Battery Replacement 18
VIII. Packing List 19

1

Warning

Thank you for purchasing .
In order to use the product properly, please follow instructions
below:

2 3

s

UNIT large jaw leakage current clamp meter

Read user's manual carefully.
Strictly observe safety rules and notes mentioned in this manual.

I. Introduction

UNIT large jaw leakage current clamp meter, supported by latest CT and
digital integration technologies and coupled with large diameter clamp(80mm

80mm, able to enclose 80mm cable or 96mm 4mm flat steel ground
wire) and automation function, is professional tool for measuring leakage
current, current and voltage. It can simultaneously measure one-way leakage
current and three-way voltages and offer simultaneous display on the screen,
which all together allow users to operate easily and quickly. The meter is
widely used in electric power, communications, meteorology, railway, oil field,
construction, metrology, R&D institutes, mining, ect.

This kind of meter is designed with clamp iron core made with special alloy
and latest magnetic screening technology, which make it able to avoid
magnetic interference from outside and ensure high accuracy, stability and

4 5

reliability all the year around. It contains RS232 interface that allows its
maximum storage of 200 sets of data to transfer into PC, thus facilitating
further operations such as on-line monitoring, history lookup, dynamic display,
history data recall, save and printing. Other functions such as backlight and
data hold together with those mentioned above turn the meter a necessary
tool for electrical safety testing.

II. Model Comparison

Model

UT253A

UT253B

Range

0.00mA 1200A 0.01mA 80mm 80mm

0.0mA 2000A 0.1mA 80mm 80mm

Resolution

Jaw Size