UNI-T UT241 Operating Manual
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UNI-T UT241 Operating Manual

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P/N:110401103621

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Summary of Contents for UNI-T UT241

  • Page 1 P/N:110401103621...

  • Page 2: Table Of Contents

    UT241/242/243 OPERATING MANUAL Safety Warning------------------------------------------------------------------------------------------------- 1 Characteristics------------------------------------------------------------------------------------------------- 2 Technical specifications-------------------------------------------------------------------------------------- 3 Instrument Layout--------------------------------------------------------------------------------------------- 9 Key function----------------------------------------------------------------------------------------------------13 Preparation before measurement------------------------------------------------------------------------ 16 Measurement function of electric energy--------------------------------------------------------------- 16 Harmonic measurement function------------------------------------------------------------------------- 37 Setup mode---------------------------------------------------------------------------------------------------- 45 10 Battery replacement ---------------------------------------------------------------------------------------- 47 11 Maintenance--------------------------------------------------------------------------------------------------- 48...

  • Page 3: Safety Warning

    UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Safety Mark 1 Safety Warning The instrument shall be designed according to safety standard of Safety Requirements for Please refer to manual for important safety marks. Electronic Measurement Products (IEC61010-1). The manual includes guaranteeing safety...

  • Page 4: Technical Specifications

    To provide USB communication record interface and special WINDOWS window image Range Accuracy Resolution software. Note: UT241 has no this function. To facilitate instrument operation by automatic range conversion circuit and panel key. 3 Technical specifications The maximum permissible overload protection current: 1000A Tolerance limit: (a% of reading + word quantity);...
  • Page 5 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Active power W=V A COS Inactive power Var=V A SIN voltage range voltage range Voltage Voltage Current Current current current range range Accuracy Accuracy Resolution Resolution The maximum permissible overload protection voltage 600V r.m.s The maximum permissible overload protection voltage 600V r.m.s...
  • Page 6 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Phase location angle ( PG = acos(PF) ) Other functions: Range Accuracy Resolution Measurement conditions Display: 4 bits of LCD with the maximum counting of 9,999 and multiplex display Range selection: Automatic rangelOver-range display: The minimum measurement current is 10A.

  • Page 7: Instrument Layout

    14. CLEAR/ key (summation key) 15. SAVE key 16. HARM key (harmonic function selection key) black blue yellow 17. UT241: HOLD key;UT242/243:LIGHT/HOLD key 18. UT241: LIGHT key; UT242/243:USB key 19. LCD 20. (Red, black, blue and yellow) testing pens Figure 1...
  • Page 8 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL 4-3 LCD display (Figure 3) 4-2 Bottom view of instrument (Figure 2) Figure 2 1. LV symbol of battery 2. Resetting symbol of data save 3. Full symbol for data save 4. USB communication symbol 5.

  • Page 9: Key Function

    UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Key function LIGHT(UT241) Press backlight ON/OFF key for a long time. POWER USB UT242/UT243 Press POWER key for a long time for bootstrap and restore function gear during Press USB communication ON/OFF key for a long time.
  • Page 11 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL (As shown in Figure 5), connect end/red testing pen, end/blue testing pen 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 measured.
  • Page 12 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL (As shown in Figure 6), connect one of V1, V2 & V3 ends which correspond to 3 phase locations As shown in Figure 7-1, please select SELECT key to and 2 testing pens of COM end to firing line and zero line of measured wires during...
  • Page 13 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Note: As shown in Figure 7-6, please press key to measure 1 Please do not measure AC voltage of more than 600 v.r.s and AC current of 1000A( v.r.s). total three-phase power. Current measured power of the 3rd...
  • Page 14 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Measurement operation of the 1st and 2nd phase locations As shown in Figure 8-3, please press SELECT key to select is the same as that of three-phase four-wire system. As Figure the 2nd phase location. It also can display active power,...
  • Page 15 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL 7.2Inactive power(kWar)+Voltage(V)+Current(A) As shown in Figure 9-5, please press SELECT key to select 1 Press MENU key to select inactive power (kWar)+voltage(V)+current(A) the 3rd phase location. It also can display active power,voltage Figure 2 Jaw shall be fixed to measured conduits in corresponding phase locations. That is, user and current of phase location of shall measure a certain phase of three-phase circuit so that jaw is on corresponding conduit.
  • Page 16 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL 6 Display will show symbol by pressing MAX/MIN key so as to display the maximum As shown in Figure 10-2, please press SELECT key to select active power, voltage and current during measurement. Please press MAX/MIN key to show...
  • Page 17 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL 7.5 Phase location angle ( )+Voltage (V)+Current (A) 5 There is no measurement function of the maximum/minimum value for this function gear. Note: 1 Press MENU to select gear of Phase location angle ( )+ Voltage (V)+ Current (A) ;...
  • Page 18 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL As shown in Figure 13, please press SELECT key to select phase locations of 1 3 to display current power of Please press SELECT key to select the 3rd phase location of Figure measured load for corresponding phase locations, current 3 shown in Figure 12-3.
  • Page 19 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL 7.8 Phase Sequence Detection 1 As shown in Figure 15, 16 &17, instrument will display phase sequence detection result for load loop of three-phase four-wire system. 1 As shown in Figure 14, press MENU to select gear of voltage (V)+voltage (V)+voltage (V) .
  • Page 20 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Jack 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 load. As shown in Figure 20, symbols of corresponding phases will not be displayed on LCD.

  • Page 21: Harmonic Measurement Function

    UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Harmonic measurement function As shown in Figure 21, LCD will display current harmonic order (with auxiliary display in left lower corner), total voltage harmonics for full wave distortion rate (with auxiliary display in right lower corner) and effective value of harmonic voltage (with main display in the middle) Press HARM key for circulation switchover of following harmonic measurement functions.
  • Page 22 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Total voltage harmonics for fundamental wave distortion rate Voltage harmonics It will measure and display effective value of total harmonics of single-phase voltage to It will measure and display effective value of various harmonics of single-phase voltage to...
  • Page 23 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Total current harmonics for full wave distortion rate As shown in Figure 25, user can press SELECT key to select No. of any measurement port to display current harmonic order (with auxiliary display in left lower corner), total current...
  • Page 24 UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL 8.5 Total current harmonics for fundamental wave distortion rate Current Harmonics It will measure and display effective value of total harmonics of single-phase current to It will measure and display effective value of total harmonics of single-phase current to...

  • Page 25: Setup Mode

    UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL Setup mode 9.2 Setup of automatic OFF time of SE2 backlight As shown in Figure 29, user can press SELEST key for bootstrap and entry into setup mode. User can press SELECT key for bootstrap and entry into setup mode. User can set automatic He also can press SELECT key for switchover to SE 2 setup.

  • Page 26: Battery Replacement

    UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL 10 Battery replacement (shown in Figure 31) symbol shows on LCD means that load voltage of battery is less than the minimum voltage to guarantee measurement tolerance limit and instrument will prompt battery replacement. Please replace battery 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.

This manual is also suitable for:

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