17

18

Figure 4 Power measurement of three-phase four-wire system

(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.

Figure 5 Power measurement of three-phase three-wire system

UT241/242/243 OPERATING MANUAL 

UT241/242/243 OPERATING MANUAL