Unit UT253A Manual de usuario

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

2 3

Warning

Thank you for purchasing .

In order to use the product properly, please follow instructions

below:

Read user's manual carefully.

Strictly observe safety rules and notes mentioned in this manual.

UNIT large jaw leakage current clamp meter

4 5

UT253A 0.00mA 1200A 0.01mA 80mm 80mm

UT253B 0.0mA 2000A 0.1mA 80mm 80mm

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

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 Range Resolution Jaw Size

6 7

III. Electric Symbols

Extreme danger! To avoid personal injury or accidents due to electric

shock, observe safety rules strictly.

Danger To avoid personal injury or accidents due to electric shock,

please follow safety regulations.

Warning Conform to safety notes, otherwise it may cause personal

injury or damage to the meter.

Dual insulation

Alternating Current AC

Direct Current DC

IV. Technical Specifications

Functions

Power

Measuring Mode

Jaw Size

Range

Resolution

to measure leakage current, current and three-phase

AC voltage

6V DC(LR6 4 Alkaline dry battery,12 hours of battery

life)

Clamp-shape CT integral mode

80mm 80mm (Able to clamp 80mm conductor or

96mm 4mm flat steel ground line)

Current: AC 0.00mA 1200A; Voltage: AC 0.00V 600V

Current: AC 0.01mA; Voltage: AC 0.01V

Conductor Location

Data Save

RS232 Port

Placed at the center of clamp jaw

Maximum 200 sets, indicated by FULL flash icon.

Yes, for data transmission to PC for further data analysis

8 9

0.00mA 300A: 1.5% 3dgt

300A 1200A: 2% 3dgt

1200A 2000A: 3% 3dgt

0.00V 600V 1.5% 3dgt

Measuring Accuracy

(23 3 70%

RH, conductor located

at the center of jaw

Communication Line

Frequency

Function Switchover

Sample Rate

Circuit Voltage

Display Mode

Dimensions

RS232 type, 1.8 meters long

Self-identification between 50Hz and 60Hz

Automatic

about 2 times per second

To measure AC voltage below 600V

LCD 128dots 64dots

Display Zone: 43mm 29mm

( Long wide thick)275mm 145mm 40mm

Backlight

Data Hold Data maintained: Indicated by HOLD icon

Controlled by LIGHT button

Overload Display

Auto Power Off

Battery Voltage

Weight

Operating Current

Out of range indicated by OL icon

Automatically 15minutes later after power on, to

conserve power energy

Low battery icon displays with battery voltage

below 5.2V, please change batteries.

The meter 1kg(battery and accessories included)

50mA consumed with backlight on; 25mA when

turning off backlight

Insulation Strength

Operating

Temperature/ Humidity

Storage

Temperature/ Humidity

-10 40 80%rh

-10 60 70%rh

AC 2kV/rms(Between iron core and housing)

IEC1010-1, IEC1010-2-032, Pollution Class 2, CAT (600V)

Safety Standards

Followed

V. Meter Description

1. Clamp Jaw

2. Function Buttons

3. LCD Display

4. Voltage Input Terminal

5. Jaw Opening Trigger

6. RS232 port (to transfer data to PC)

7. Screws (to connect upper and lower covers, 6pcs)

8. Battery Cover

9. Screw (to fix battery cover, 1pcs)

10 11

12 13

VI. Operating Instructions

1. Power on/off

Press POWER button to power on, display LCD and enter into measuring

mode, repress to turn off the meter. The meter will automatically switch off

15 minutes later after power on. You should change the battery if dark LCD

appears after power on and may be caused by low battery voltage.

Under data save status, you need to press HOLD button to cancel the

operation before press POWER button to power off the meter.

2. Backlight Control

Use LIGHT button to control backlight, suitable for dark sites and at night.

The default is backlit status after power on.

3. Data Hold and Save

Under measuring mode, press HOLD button to maintain displayed data,

indicated by HOLD icon, and repress to cancel the operation. The meter

will automatically number current data at the time of saving, indicated by

group number such as SAVE NO. 001 . Maximum data storage is 200

sets and is achieved when FULL icon shows

4. Data Access and Exit

Under measuring mode, Press MENU to access data research with

indication of READ icon. You can start data research from R 001 ,

press Up button to increment by 1, down button to increment by 10

and MENU button to exit this status and return to measuring mode.

5. Data Transmission to PC

The accessory RS232 connection line is used for communication of the

meter with PC. With the meter power on and the software running, several

following operations such as history lookup, data recall, save, report sheet,

history printing can all be performed. The more data the meter saves,

more time it will take to read out. History data can be saved in Txt or Excel

format.

14 15

6. Data Delete

Press CLEAR button to select data clearing option under data access

mode, then use Left or Right button to move the cursor for selecting

YES or NO , finally press MENU button to confirm the operation or

return to the measuring mode.

7. Leakage Current, Current and Voltage Measurements

Dangerous Voltage! To avoid personal injury or accidents in case of

electric shock, only trained and authorized staff is allowed to operate

and must strictly observe safety rules

Danger! To avoid any damage to the meter or personal injury in

case of electric shock do not measure voltage above 600V

Please Keep the jaw properly open or close when measuring

leakage current or current.

Try to place the conductor at the center of the jaw

Please keep the jaw clean and regularly maintained after finishing

measurement.

Ensure correct wire connection to avoid short-circuit problem during

voltage measurement

Disconnect test leads with measured lines before pulling them out

of the meter in case of electric shock

Clamping live and wires is to measure leakage current of

electric instruments(2 wires needed)

neutral

Clamping the ground wire is to measure its leakage current (single

wire needed)

Clamping all three phases and four wires is to measure total

leakage current(four wires needed)

Clamping the main wire is to measure current of the main circuit

(single wire needed).

16 17

Measuring Reference Figure: Measuring Leakage

Current of Built-in

Cable

Measuring Instrument

Leakage Current

Measuring Ground

Leakage Current

Measuring Total

Leakage

Grounding Line

Measuring

Tank

Measuring Current and

Voltage Phase Angles

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