Power and Harmonics Clamp Meters P/N: 110401102607
UT241/242/243 OPERATING MANUAL 1 2 3 4 5 6 7 8 9 10 11 Safety Warning------------------------------------------------------------------------------------------------- 1 Characteristics------------------------------------------------------------------------------------------------- 2 Technical specifications-------------------------------------------------------------------------------------- 3 Instrument Layout--------------------------------------------------------------------------------------------- 9
UT241/242/243 OPERATING MANUAL 1 Safety Warning UT241/242/243 OPERATING MANUAL Safety Mark The instrument shall be designed according to safety standard of Safety Requirements for Electronic Measurement Products (IEC61010-1). The manual includes guaranteeing safety status of instruments for safe use, warnings and safety statutes which must be executed by users. Please read following instructions before use: LCD will display warning symbol if measured voltage exceeds AC 30V.
UT241/242/243 OPERATING MANUAL Please design and produce according to international standard of EN61010-1 and international safety code of EN61010-2-032 by abiding by safety standard of duplex insulation of CAT 600V strictly. Adopt power measurement system which consists of chips by new high-performance and large-capacity chip microprocessor and the latest special high-precision chips used for power measurement with high integration level and reliable performance.
UT241/242/243 OPERATING MANUAL Active power W=V A COS Voltage UT241/242/243 OPERATING MANUAL Inactive power Var=V A voltage range voltage range Voltage Current Current current range current range Accuracy Resolution The maximum permissible overload protection voltage 600V r.m.s The maximum permissible overload protection current 1000A r.m.s SIN Accuracy Resolution ar ar ar ar ar ar ar ar ar ar ar ar ar The maximum permissible overload protection voltage 600V r.m.
UT241/242/243 OPERATING MANUAL Phase location angle ( PG = acos(PF) ) Range Accuracy Other functions: Resolution Only for reference Measurement conditions The minimum measurement current is 10A. The minimum measurement voltage is 45V. Measurement current is less than 10A or measurement voltage is less than 45V. The maximum permissible overload protection voltage 600V r.m.s The maximum permissible overload protection current 1000A r.m.
UT241/242/243 OPERATING MANUAL Fittings: User's Manual--------------------------------------------------------------1 manual Alkaline battery------------------------------------------------------------ 4 batteries (Red, black, blue and yellow) testing wires ------------------------4 wires (Red, black, blue and yellow)------------------------------------------ 4 wires Tool kit and colorful box------------------------------------------------- 1 respectively USB communication interface wire -------------------
UT241/242/243 OPERATING MANUAL 4-2 Bottom view of instrument (Figure 2) UT241/242/243 OPERATING MANUAL 4-3 LCD display (Figure 3) Figure 2 Figure 2 1. Infrared interface slot; 2. USB communication interface wire (only for UT242/243) 11 1. LV symbol of battery 3. Full symbol for data save 5. Data retention symbol 7. Opening symbol of automatic power-off function 9. Symbol of the 3rd phase location 11. Symbol of the 1nd phase location 13. Unit of the 1st auxiliary parameter 15. Minute unit 17.
UT241/242/243 OPERATING MANUAL 5 Key function POWER Press POWER key for a long time for bootstrap and restore function gear during previous power-off automatically after bootstrap. Press the key for a short time under bootstrap status for power-off. HOLD(UT241) Press the key for a short time to keep display data; HOLD/LIGHT(UT242/243) Press the key for a short time to keep display data or press backlight ON/OFF key for a long period.
UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL (As shown in Figure 5), connect V1 end/red testing pen, V2 end/blue 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 measured.
UT241/242/243 OPERATING MANUAL (As shown in Figure 6), connect one of V1, V2 & V3 ends which correspond to 3 phase locations and 2 testing pens of COM end to firing line and zero line of measured wires during measurement of 2 single-phase wires.
UT241/242/243 OPERATING MANUAL As shown in Figure 7-6, please press key to measure total three-phase power. Current measured power of the 3rd phase location also shall be calculated and saved. Figure 7-6 As shown in Figure 7-7, total three-phase active power can be displayed by pressing SELECT key finally. Figure Measurement operation of the 1st and 2nd phase locations is the same as that of three-phase four-wire system.
UT241/242/243 OPERATING MANUAL As shown in Figure 8-3, please press SELECT key to select the 2nd phase location. It also can display active power, voltage and current of phase location of 2. Figure As shown in Figure 8-4, 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 8-5, please press SELECT key to select the 3rd phase location.
UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL 7.2Inactive power(kWar)+Voltage(V)+Current(A) 1 2 Press MENU key to select inactive power (kWar)+voltage(V)+current(A) Jaw shall be fixed to measured conduits in corresponding phase locations. That is, user shall measure a certain phase of three-phase circuit so that jaw is on corresponding conduit.
UT241/242/243 OPERATING MANUAL 6 Display will show MAX symbol by pressing MAX/MIN key so as to display the maximum active power, voltage and current during measurement. Please press MAX/MIN key to show MIN symbol on LCD and display the minimum active power during measurement. Please press MAX/MIN key so that MAX and MIN symbols flicker together. It can display current value and record the maximum value and the minimum value at the same time during measurement.
UT241/242/243 OPERATING MANUAL UT241/242/243 OPERATING MANUAL 7.5 Phase location angle ( )+Voltage (V)+Current (A) 5 1 2 Note: Please do not measure AC voltage of more than 600V r.m.s 3 4 Press MENU to select gear of Phase location angle ( )+ Voltage (V)+ Current (A) ; Jaw shall be fixed to measured conduits in corresponding phase locations. That is, user shall measure a certain phase of three-phase circuit so that jaw is on corresponding conduit.
UT241/242/243 OPERATING MANUAL Please press SELECT key to select the 3rd phase location of 3 shown in Figure 12-3. It also can display frequency, voltage and current of phase location of 3. 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 statistic period and current accumulated electric energy on LCD.
UT241/242/243 OPERATING MANUAL 7.8 Phase Sequence Detection 1 UT241/242/243 OPERATING MANUAL 1 As shown in Figure 14, press MENU to select gear of voltage (V)+voltage (V)+voltage (V) . Insert red testing pen into V1 jack, blue testing pen into V2 jack, yellow testing pen into V3 jack and black testing pen into COM jack and connect 4 testing pens to measured power, three-phase load and grounding end.
UT241/242/243 OPERATING MANUAL 4 Jack Phase location A, B & C Detection result 3 UT241/242/243 OPERATING MANUAL 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. Positive sequence Inverted sequence layout is shown in following figure.
UT241/242/243 OPERATING MANUAL 8 Harmonic measurement function Press HARM key for circulation switchover of following harmonic measurement functions. 3 frequency modes, namely, AUTO , 50Hz and 60Hz c an be s elected for all harmonic measurement functions respectively.User can press HARM key for a l ong time to alter frequency mode temporarily during measurement. (Instrument will restore default mode after power-off.) Default frequency mode also can be set under setup mode. (Please refer to Clause 9.
UT241/242/243 OPERATING MANUAL 8.2 Total voltage harmonics for fundamental wave distortion rate UT241/242/243 OPERATING MANUAL 8.3 Voltage harmonics It will measure and display effective value of total harmonics of single-phase voltage to fundamental wave distortion rate, harmonic order and corresponding orders of harmonic voltage for load of three-phase four-wire system.
UT241/242/243 OPERATING MANUAL 8.4 Total current harmonics for full wave distortion rate It will measure and display effective value of total harmonics of single-phase current to full wave distortion rate, harmonic order and corresponding orders of harmonic current under the mode. UT241/242/243 OPERATING MANUAL As shown in Figure 25, user can press SELECT key to select No.
UT241/242/243 OPERATING MANUAL 8.5 Total current harmonics for fundamental wave distortion rate UT241/242/243 OPERATING MANUAL 8.6 Current Harmonics It will measure and display effective value of total harmonics of single-phase current to fundamental wave distortion rate, harmonic order and corresponding orders of harmonic current under the mode.
UT241/242/243 OPERATING MANUAL 9 Setup mode 9.2 User can press SELECT key for bootstrap and entry into setup mode. User can set automatic power-off time (SE1), automatic backlight OFF time (SE2) and default frequency mode of harmonic function (SE3) under setup mode. User also can press SELECT key for a short time for SE1 & SE2 switchover and SE2 setup functions. User shall press SAVE key to save setup and enter into normal measurement mode after setup.
UT241/242/243 OPERATING MANUAL 10 Battery replacement (shown in Figure 31) UT241/242/243 OPERATING MANUAL 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.
UT241/242/243 OPERATING MANUAL 49 UT241/242/243 OPERATING MANUAL 50
