13

14

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.

MENU

    Function menu selection key: Please select active power (kW)+voltage(V)+current(A), 
    apparent power (kVA)+voltage(V)+current(A), inactive power(kVar)+voltage(V)+current(A), 
    power factor (COS

)+voltage (V)+ current(A), reverse power factor (SIN

)+voltage(V)

   +current(A), phase location angle(

)+voltage(V)+current(A), frequency(Hz)+voltage(V)

   +current(A), electric energy(kWh)+active power(kW)+statistic period and phase sequence 
    judgment in sequence. (Only UT243 has this function.)

HARM 

    Press the key for a short time to enter into harmonic measurement mode with switchover 
    circulation for total voltage harmonics to total wave distortion rate, total voltage harmonics to 
    fundamental wave distortion rate, voltage harmonics, total current harmonics to total wave 
    distortion rate, total current harmonics to fundamental 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 backlight ON/OFF key for a long time.
    USB

UT242/UT243

    Press USB communication ON/OFF key for a long time.

LOAD

    Press LOAD key for a short time once to enter into single LOAD data status and 
    press it again to exit LOAD status.
    Press LOAD key for a long time to enter into continuous circulation LOAD data status 
    and press it again to exit LOAD status.

SELECT

    Phase A, B & C and total phase power selection key

SAVE

    Press the key for a short time once to record data.
    To record data continuously when pressing SAVE key for a long time and press it for a 
    short time to exit continuous SAVE status.
    LCD will display FULL symbol to show that RAM is full of data when displaying data save 
    quantity of 999. Next group of data cannot be saved until pressing CLEAR key for a long time 
    to eliminate data in RAM.

/CLEAR

    Press 

 key for a short time during measurement in active power/apparent 

    power/inactive power function gear to calculate and save power for the 1st phase of 
    currently measured measurement result. Measure the 2nd phase of power and press 
   

 key again to calculate and save the 2nd phase of data power. Measure the 3rd 

UT241/242/243 OPERATING MANUAL 

UT241/242/243 OPERATING MANUAL