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Table of Contents
Related Manuals for UNI-T UT276A
Summary of Contents for UNI-T UT276A
- Page 1 P/N:110401103514...
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Page 2: Table Of Contents
UT276A/278A OPERATING MANUAL Contents I Safety Instructions II Product Overview Unpack and Check IV Product Specification Series Types Range and Accuracy Technical Specification V Clamp Meter Structure VI Liquid Crystal Display Liquid Crystal Display Instruction for Special Symbol Display Demonstration... -
Page 3: I Safety Instructions
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL I Safety Instructions 6 Data Inquiry Thank you for purchasing the Clamp-on Ground Resistance of our company Alarm Function Setting and for the full use of the product, please: Alarm Critical Value Inquiry Read the user manual carefully. -
Page 4: Product Overview
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL institution to address the problem. Contact surface of the clamp jaw shall keep clean and refrained from cleaning by corrosive and coarse matters. The contents labeled with in the user manual shall be only applicable to Refrain from any shock on the clamp meter , especially the junction surface of UT278A. -
Page 5: Unpack And Check
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL contact with your supplier . Product in the UT270 clamp-on ground series, its uniqueness are: No long time waiting for start up, enter into testing immediately . Meter The only one clamp-on ground resistance meter with... -
Page 6: Range And Accuracy
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL 3 Technical Specification 2 Range and Accuracy Resistance range Measurement mode Accuracy Measurement Scope Resolution *Current range Resistance resolution *Current resolution Data storage 99groups To upload stored data into the computer for Resistance RS232 port data analysis. -
Page 7: Clamp Meter Structure
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL V Clamp Meter Structure Clamp jaw dimension 65mm 32mm Clamp jaw stretch size 28mm 1 Long clamp head: 65 32mm Clamp surface mass 1160g (inclusive of battery) 2 Trigger: control the closure and open... -
Page 8: Liquid Crystal Display
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL 2 Instruction for Special Symbol VI Liquid Crystal Display clamp jaw open symbol. It shall display when the clamp jaw is open. It 1 Liquid Crystal Display indicates that it might be artificial pull-off the trigger; or the clamp jaw has been too dirty to measure, requiring clamp jaw cleaning. -
Page 9: Display Demonstration
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL (8) MEM full stored data symbol, when the stored data has reached 99 groups power-on error indication Er(Error) and can't store data anymore, the symbol MEM shall flicker. (It might be caused by the dirtiness (9) MR Data inquiry symbol, it shall appear in inquiring data and indicate the No. - Page 10 UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL resistance of the loop being start alarm function and the current measured is 2.1 being measured exceed the set hold the present measurement alarm critical value value 2.1 , battery low voltage display and the store automatically as the No.08...
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Page 11: Operation Methods
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL VII Operation Methods 1 Power-on Notes When starting it, don't pull the trigger , open the clamp jaw and clamp any wires. pull the trigger, open the clamp jaw and clamp wires only after power-on and... -
Page 12: Power-Off
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL original accuracy in measuring low resistance, user can use it with assurance. Users are required to test by random test ring as shown in picture 5. The displayed value should be the same with 2 Power-off standard value on the test ring (10.0 ), which... -
Page 13: Current Measurement
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL Display L0.01 it means the resistance being measured exceed the lower limit 4 Current measurement of clamp meter, as shown in picture6. Notes: the meter is mainly used for ground resistance test and the current measurement... -
Page 14: Data Hold/Unlock/Store
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL numbered automatically orderly and be stored. Press key HOLD to cancel hold, the symbol HOLD would disappear and continue to measure. Operate as the above steps; you can store 99 groups of data. If the memory is full, the symbol MEM will flicker . -
Page 15: Data Inquiry
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL Under the data inquiry mode, press key SAVE to exit the data inquiry and hold, Under setting alarm critical value status, it is required to press key POWER to exit store the data. the status and press key SAVE to enter into the stored data inquiry mode. -
Page 16: Alarm Critical Value Inquiry
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL Flicker Flicker Flicker Picture 15 Picture13. Set the resistance Picture14. Set the current 9 Data Wipe alarm critical value alarm critical value Under the data inquiry mode, press key SA VE+POWER, automatically wipe all stored data, after it , meter shall display as shown in the picture 12, and all 8 Alarm Critical Value Inquiry wiped data shall not able to recover . -
Page 17: Measurement Principles
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL 2 Current Measurement Principle VIII Measurement Principles The basic principle of UT278A clamp-on ground resistance meter is the same with 1 Resistance Measurement Principle that of current transformer measurement. Conductor being measured Basic principle of the clamp-on ground... -
Page 18: Ground Resistance Measurement Method
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL Of which, R1 is the estimated ground resistance and R0 is the equivalent Of which: n is the transformer ratio coefficient between secondary and primary coil. resistance of all other towers ground resistance in parallel. -
Page 19: Single Point Ground System
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL great errors. This is nonlinear equations with N unknown and N equations. It has certain Owing to the same reason, we neglect the impact of mutual resistance solution, but which is difficult to solve by manual operations and even impossible... - Page 20 UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL method fail to measure. of test line. Resistance RL could be measured by clamp meter by connecting the test line Two -point method As shown in the following picture, find an independent ground body RB with good end to end.
- Page 21 UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL Step3, connect RC and RA with a test line, as shown in the following picture, and read the third data R3 by clamp meter . Step2, connect RB and RC with a test line, as shown in the following picture, and read the second data R2 by clamp meter.
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Page 22: On-Site Application
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL resistance of the opposite line, and then divided by2. In measurement, if clamp meter display L 0.01 it is possible that more Ground resistance value of other two reference ground bodies are: than 2 ground down leads of... -
Page 23: Application Of The Building Lightning Protection Ground System
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL If measurement value of clamp meter is lower than the allowable value of ground resistance +fire hydrant ground resistance resistance, ground resistance of computer room and launching tower shall be If the fire hydrant ground resistance is quite low, computer room ground qualified. -
Page 24: Application Of The Gas Station Ground System
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL explosion-proof mark being Exia BT3. The clamp can apply to the flammable 4 Application of the gas station ground system and explosive atmosphere. Under the explosive gas atmosphere, equipment or infrastructure such as gas Oil tank and loading point ground resistance measurement station, oil field, oil chute etc. - Page 25 UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL We can calculate that: As shown in the above picture, find a ground polarity independent from Oil tank ground resistance RA= R1+R2-R3 oil-filling machine, for instance, loading point polarity . Connect them with test line...
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Page 26: Notes About Ground Resistance Measurement
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL ground resistance is qualified. Connect oil stopper with the oil-filling machine by a test line and measure the For instance: the ground resistance allowable value stipulated in the GB50061-97 reading RT by clamp meter, then calculate:... - Page 27 UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL composite resistance of the ground branch circuit, it includes the contact resistance, lead resistance and ground body resistance of the branch circuit to the public ground wire. Value measured by the traditional voltage current method in tripping is only the ground body resistance.
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Page 28: Appendix: Loop Resistance Analysis
UT276A/278A OPERATING MANUAL UT276A/278A OPERATING MANUAL Appendix: loop Resistance Analysis If the parallel value of ground A and B loop measured by 2-point method is 5.0 Loop resistance includes ground resistance value of point A to the ground, RA+RB+R over head wire +R ground down lead=5.0...