Unit UT253A Manual de usuario
P/N:110401103625
DATE:2018.06.26
REV.3
1
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
s
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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