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4-2 Bottom view of instrument (Figure 2)

Figure 2 

1. Infrared interface slot; 
2. USB communication interface wire (only for UT242/243)

4-3 LCD display (Figure 3)

1. LV symbol of battery

2. Resetting symbol of data save

3. Full symbol for data save

4. USB communication symbol

5. Data retention symbol

6. Phase sequence judgment symbol

7. Opening symbol of automatic power-off function

8. Symbol of total three-phase power

9. Symbol of the 3rd phase location

10. Symbol of the 2nd phase location

11. Symbol of the 1nd phase location

12. Main parameter unit

13. Unit of the 1st auxiliary parameter

14. Second clock unit

15. Minute unit

16. Hour unit

17. Symbol of the minimum value

18. Symbol of the 2nd auxiliary parameter

19. Symbol of true effective value

20. Symbol of the maximum value

21. Sine symbol

22. Cosine symbol

23. Cathode symbol

24. AC symbol

25. Data retention symbol

26. Callout symbol of data save

27. HV warning symbol

UT241/242/243 OPERATING MANUAL

UT241/242/243 OPERATING MANUAL

Figure 2 

Summary of Contents for UT241

Page 1: ...P N 110401103621...

Page 2: ...cteristics 2 3 Technical specifications 3 4 Instrument Layout 9 5 Key function 13 6 Preparation before measurement 16 7 Measurement function of electric energy 16 8 Harmonic measurement function 37 9...

Page 3: ...the operation manual especially safety content carefully before using instruments Safety Mark Please refer to manual for important safety marks HV danger Grounding Duplex insulation for Class II safet...

Page 4: ...active power inactive power and apparent power which contains harmonics for 20 times correctly To measure total harmonic distortion rate of voltage current signals for at most 20 times and harmonic c...

Page 5: ...ar ar ar ar ar ar ar ar ar Current Voltage current range Accuracy Resolution The maximum permissible overload protection voltage 600V r m s The maximum permissible overload protection current 1000A r...

Page 6: ...inimum value is 50V and the maximum value is 500V Other functions Display 4 bits of LCD with the maximum counting of 9 999 and multiplex display Range selection Automatic rangelOver range display OL A...

Page 7: ...y electric energy function selection key 6 LOAD key 7 SELECT key phase location selection key and total power measurement selection key 8 key 9 V3 end the 3rd phase location of measurement input end 1...

Page 8: ...otal three phase power 9 Symbol of the 3rd phase location 10 Symbol of the 2nd phase location 11 Symbol of the 1nd phase location 12 Main parameter unit 13 Unit of the 1st auxiliary parameter 14 Secon...

Page 9: ...undamental wave distortion rate and current harmonics Press the key for a long time to alter harmonic frequency mode temporarily under harmonic mode for invalidation after power off LIGHT UT241 Press...

Page 10: ......

Page 11: ...e testing pen and COM end black testing pen to every firing line of three phase load respectively during load measurement of three phase three wire system V3 end yellow testing pen also cannot be meas...

Page 12: ...2 please press key to measure total three phase power Current measured power of the 1st phase location also shall be calculated and saved Figure As shown in Figure 7 3 please press SELECT key to sele...

Page 13: ...ng measurement Please press the key for a long time to exit the maximum minimum value mode Note 1 Please do not measure AC voltage of more than 600 v r s and AC current of 1000A v r s 2 key does not e...

Page 14: ...our wire system As shown in Figure 8 8 total three phase apparent power can be displayed by pressing SELECT key after tripping the 3rd phase location of measurement Figure 5 The maximum measuring rang...

Page 15: ...Figure As shown in Figure 9 4 please press key to measure total three phase power Current measured power of the 2nd phase location also shall be calculated and saved Figure As shown in Figure 9 5 ple...

Page 16: ...stem three phase three wire system or single phase two wire system 4 As shown in Figure 10 1 please press SELECT key to select the 1st phase location of 1 for load of three phase four wire system It a...

Page 17: ...operation of the 1st and 2nd phase locations is the same as that of three phase four wire system after tripping the 3rd phase location of measurement 5 There is no measurement function of the maximum...

Page 18: ...tem or single phase two wire system As shown in Figure 13 please press SELECT key to select phase locations of 1 2 3 to display current power of measured load for corresponding phase locations current...

Page 19: ...1 As shown in Figure 15 16 17 instrument will display phase sequence detection result for load loop of three phase four wire system Figure 15 Any phase of voltage is less than 30V Figure 16 Inverted...

Page 20: ...ult Jack Inverted sequence Inverted sequence Figure 19 4 LCD will display default phase detection result if certain phase of voltage is less than 50V or without signal for three phase four wire system...

Page 21: ...tage for load of three phase four wire system Measurement steps Press HARM key to enter into measurement mode of total voltage harmonics to total wave distortion rate firstly after bootstrap and conne...

Page 22: ...in right lower corner respectively Figure 23 User can press key to increase harmonic order or press key to reduce harmonic order It also will display effective value of various voltage harmonic compo...

Page 23: ...loop cables of measured phase and loosen and guarantee excellent closing of binding clip Figure 24 As shown in Figure 25 user can press SELECT key to select No of any measurement port to display curre...

Page 24: ...rder It also will display effective value of various current harmonic components 8 6 Current Harmonics It will measure and display effective value of total harmonics of single phase current to fundame...

Page 25: ...2 20m 20 minutes 3 30m 30 minutes 4 OFF Automatic power off function is OFF 9 2 Setup of automatic OFF time of SE2 backlight As shown in Figure 29 user can press SELEST key for bootstrap and entry int...

Page 26: ...y according to following steps 1 Cut off testing circuit for testing pen press POWER key for power off and remove testing pen from input jack 2 Open cell cover of instrument and remove old battery and...

Page 27: ......

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