3.5 Measuring Efficiency
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In this example, we will measure the input-output efficiency (energy conversion efficiency) of a 3-phase/3-wire
inverter with DC input and AC output. The input side of the inverter will be input to CH3 of the instrument, and
the output side will be input to CH1 and CH2 of the instrument.
Measuring the input-output efficiency of a DC-to-AC (3-phase/3-wire)
inverter
1 Press and set the wiring mode to
[3P3W&1P2W].
In this case, the switching power supply’s input and
output efficiency can be calculated as
η2(=|Psum|/|P3|×100 [%]), so set the display param-
eter to η2.
2 Press or to display [sum]
[W] (Psum) for [ACDC] in area a on the
display.
Press or to display [CH3]
[W] (P3) for [ACDC] in area b on the dis-
play.
Press to display [η2] in area c on
the display.
Output side (AC, 3P3W)Input side (DC, 1P2W)
Inverter
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