Unit UT255A Manual de usuario
P/N:110401103626
1
Contents
TITLE PAGE
Warning 3
I. Introduction 6
II. Electrical Symbols 8
III. Model Comparison 9
IV.Technical Specifications 10
V. Meter Description 14
VI. Display Mode 16
1. LCD Display 16
2. Special Icon Description 17
3. Display Examples 18
VII. Operating Instructions 21
1. Measuring Instruction 21
(1) Power On/Off 21
(2) General Measurement 22
2 3
TITLE PAGE
(3) PEAK Measurement 28
(4) Data Hold 29
(5) Data Save 29
(6) Data Access 30
(7) Data Delete 30
*(8) Data Transmission 30
2. Receiving Instructions 31
(1) Power On/Off 31
(2) Data Receive 32
(3) Data Hold 32
(4) Data Save 32
(5) Data Access 33
(6) Data Delete 33
VIII. Battery Replacement 34
IX. Packing List 36
Warnings
Thank you for purchasing UNIT series high voltage clamp ammeter.
In order to use the product properly, please follow instructions below:
-----Read this manual carefully and the operator is required to fully
understand the manual and operate skillfully before beginning
on-site tests.
-----Strictly observe safety rules and notes mentioned in this manual.
4 5
6 7
I. Introduction
High voltage clamp ammeter stands out from traditional concept and is
especially designed for on-line measurement on current, leakage current of
high-voltage lines and determining working status of zinc oxide arrester. It is
supported by latest CT and screening technologies and made up of exclusively
high-voltage tester and high-voltage insulation rods. UT255B, in particular can
offer wireless data transmission function and be equipped with wireless
receiver that allows it to straightly receive data within 20 meters. The meter is
also used as kinds of low-voltage leakage current clamp tester and
amperemeter that are capable of accuracy up to 0.01mA .You had better to
use wireless transmission model when focusing on measuring extremely
small flow of leakage current or current and at the same time offered with
timely data display.The design to integrate both clamp jaw and guide zone
ensures this kind of meter to enjoy high accuracy, reliability and stability all
the year around, and it is offered with insulation rods with outstanding
With the insulation rod, the meter can measure leakage current in high-
voltage lines below 60kV and on-line current, and identify if zinc oxide
arrester is moisture-affected or not. There are also other functions provided
for the meter: peak value hold, data hold, data save and wireless data
transmission. Given the condition that high-voltage clamp can be easily
connected or disconnected to measured lines with the help of insulation rods,
so the meter can be widely used in transformer station, power plant, mining,
inspection center, electrician maintenance and repairing center for conducting
leakage current testing and outdoor electrical operation.
This kind of meter is also used as high/low-voltage current transformer
ratio tester and zinc oxide arrester meter, that is to say it can respectively
measure two times of loop current of current transformer and then calculate
features such as moisture proof, high temperature resistance, anti-strike and
bending, high insulation, extendibility ,ect.
8 9
the ratio or reduced ratio. One thing to mention is: under general circumstances,
considering the leakage current should be lower than 500uA for a running
arrester, the meter can tell us the working status of the arrester. If checked
out with leakage current higher than 500uA, the arrester may have been
contaminated, moisture-affected or experienced aging, because the higher
flow of leakage current it is, the more severe phenomena above are.
II. Electrical Symbols
Extreme danger! To avoid personal injury or accidents in case of
electric shock, observe safety rules strictly.
Danger! To avoid personal injury or accidents in case of electric
shock, please follow safety notes.
Warning! Confirm to the safety instructions, otherwise it may cause
personal injury or damage to the meter.
Alternating Current AC
Direct Current DC
UT255A 10uA 600A 10uA 33mm
III. Model Comparison
Model Range Resolution Jaw Size Notes
General Type
Special, with
wireless
transmission
function
UT255B 10uA 600A 10uA 33mm
under general circumstances
10 11
IV. Technical Specifications
To measure high-and low-voltage AC leakage current
and on-line current; indirectly obtain ratio of current
transformer
DC6V Alkaline dry battery 1.5V AAA 4
Clamp-type CT, integral mode
UT255B 433MHz wireless transfer up to about 20
meters
4- digit LCD display, backlight, suitable on dark sites
47mm 28.5mm
Functions
Power
Measuring Mode
*Transmission mode
Display Mode
LCD Size
Dimensions
High-voltage tester (wide high thick): 68mm
245mm 40mm
UT255B Receiver (wide high thick): 75mm
170mm 30mm
33mm
2 times per second
AC 0.01mA 600.0A 50/60Hz auto
10uA
0.01mA 600A automatically switch
Jaw Opening
Sampling Rate
Measuring Range
Resolution
Function Switchover
0.01mA 100.0A: 1% 5dgt
100.0A 200.0A: 2% 5dgt
200.0A 600A: 3% 5dgt
Accuracy
23 5
80%RH
Max.99sets, MEM icon displays during storing,
FULL icon shows if fully save
Automatically hold peak values, Press PEAK button
under general measuring mode to start, indicated by
peak light, repress to switch off
Data Save
PEAK Hold
To measure line voltage below 60kV operate with
insulation rod
Press HOLD button to hold data under general
measuring mode, indicated by HOLD icon, then
repress to cancel the operation.
Line Voltage
Data Hold
Out of-range display: indicated by OL A icon
Dynamic display of no- - icon when receiving no
signal
15 minutes later after power on, to conserve power
energy
Indicated by MR icon able to scroll up or down
to read out data
Low battery icon displays with voltage lower
than 4.8V, please timely change the battery
Data Access
Overload Display
* Display for no signal
Auto Power Off
Battery Voltage
Tester 335g battery included ; total weight
2.5Kg insulation rod and battery included
Weight
Storage
Temperature/ Humidity
Operating
Temperature /Humidity -20 40 ; 80%Rh
-20 60 ; 70%Rh
No 315MHz, 433MHz shared frequency interference
32mm, 1m per piece 5PCS
*Interference
Insulation Rod
Insulation strength between fifth insulation rod and
tester housing: AC 100kV/rms; between tester
housing and iron core: AC1000V/rms
Leakage resistance type
Insulation Strength
Structure
12 13
14 15
V. Meter Description
1. Clamp Jaw (Guide zone included)
2. UT255A Tester
3. LCD Display
4. PEAK Measuring Indication
5. PEAK Button
6. POWER Button
7. HOLD Button
* 8. UT255B Receiver
9. Insulation Rod connection Terminal
*10. POWER Indication
*11. UT255B tester
12. Insulation Rod (5 Pcs)
16 17
VI. Display Mode
1. LCD display
. AC icon
. Low battery icon
. Data Save Display
. Data Access Display
. 2-digit serial numbers
for data save
. Unit Icon
. Data hold Display
. Decimal Point
. 4-digit LCD Display
. Low battery displays with voltage lower than 4.8V, please change
batteries timely.
. OL A icon indicates measured current is out of limit.
. MEM icon displays during data save process.
. FULL icon flashes when maximum value of 99sets are achieved,
indicating no save operation any more.
. MR icon displays together with saved data serial numbers during data
research.
. End is to indicate exiting the process.
. dEL indicates during data delete process.
* . no- - dynamically indicates no signal is received; it is likely the tester
is not under testing mode, or being adjusted for right receiving place and
distance.
2. Special Icon Description
Este manual sirve para los siguientes modelos
1
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