UNI-T UT255A Operating Manual Download Page 2

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Contents

TITLE PAGE
Warning

I. Introduction

II. Electrical Symbols

III. Model Comparison

IV.Technical Specifications

V. Meter Description

VI. Display Mode

1. LCD Display

2. Special Icon Description

3. Display Examples

VII. Operating Instructions

1. Measuring Instruction

(1) Power On/Off

(2) General Measurement

Summary of Contents for UT255A

Page 1: ...P N 110401103626 ...

Page 2: ...ls 8 III Model Comparison 9 IV T echnical 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 ...

Page 3: ...a 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 ...

Page 4: ...4 5 ...

Page 5: ...nd 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...

Page 6: ...he 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 C...

Page 7: ...de 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 du...

Page 8: ...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 ...

Page 9: ...w 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 ...

Page 10: ...ed 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 ...

Page 11: ...data serial number 03 Measured current displayed 160 5A Measured current displayed 571A Low battery display please change the battery Access to data No 03 Measured current displayed 160 5A FULL icon flashes Max 99 is achieved Memory needs clearing before resave dEL to indicate data clearing ...

Page 12: ... POWER button to switch off under HOLD mode 1 Power On Off Press POWER to power on display LCD and enter into general measuring mode You should change the battery if dark LCD appears after power on and may be caused by low battery voltage To conserve power energy the meter will automatically switch off 15 minutes later after power on indicated by 30 seconds of LCD flashing And you can continue ope...

Page 13: ...ise it may cause personal injury or damage to the meter in case of electric shock General Measurement LCD will display real time measured current during measuring process Displayed data on LCD varies with current flow and will be back to zero if no measuring result has been held after disconnecting the tester with measured lines General measuring mode is suitable for short distance operation and f...

Page 14: ...higher range or choose another meter then if disconnecting the conductor with the meter pull back the meter see Figure C and try to keep the conductor perpendicular to the guide zone during this operation The Conductor Pull Forward Pull Back Figure A Figure B Figure C Ground Terminal Measuring Leakage Current of Zinc Oxide Arrester High Voltage Terminal Measuring Current in High Voltage Circuit Me...

Page 15: ...d and aging to cause this problem The more flow of leakage current it is the more severe the phenomenon is The operator can decide to repair the arrester or discharge it for lab testing based on leakage current flow so as to avoid blind operations Press HOLD button to return to general measuring mode if under HOLD mode Press HOLD button to return to general measuring mode if under data access mode...

Page 16: ...to switch from general measuring mode to PEAK Mode indicated by PEAK light Then the meter will display and automatically hold the maximum current value If under other modes you need to return to measuring mode before starting PEAK measurement Press PEAK to exit and go back to general measurement mode indicated by End during the process 4 Data Hold Press HOLD button to maintain data on LCD under ge...

Page 17: ... can offer wireless data transmission function and allow testing results to send back to the receiver in a wireless way So the receiver can provide real time data and is easy to observe Send back signals only under measuring mode If not successfully receiving those signals it will dynamically display no icon UT255B it can wirelessly transfer data and the receiver can receive data within about 20 m...

Page 18: ...e Under receiving mode the receiver will automatically number current data when pressing HOLD button to keep data MEM icon displays one time during the process The maximum storage is 99 sets and achieved when FULL icon continuously flashes to indicate the memory needs clearing for second save 5 Data Access Under receiving mode press HOLD POWER buttons to enter into data access mode MR icon and at ...

Page 19: ...attery icon displays with voltage lower than 4 8V please change batteries timely 2 Power off confirm it and then loosen two screws on the battery cover With the cover opened change old batteries with new specified ones Ensure right polarity is selected and tighten screws to close the cover 3 Press POWER button and check if the meter can successfully power on if not repeat the second step Battery C...

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