Hioki PW3336-01 - Examples of Efficiency Measurement

3.5 Measuring Efficiency
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Examples of efficiency measurement
The following provides examples of efficiency measurement. Before making actual measurements, connect
and configure the instrument as described in "Chapter 2 Measurement Preparations" (p.27).
In this example, we will measure the input and output efficiency of a switching power supply with 1-phase/2-
wire AC input and a single DC output circuit. The input side of the power supply will be input to CH1 of the
instrument, and the output side of the power supply will be input to CH2 of the instrument. The 1P2W×2 wiring
mode will be used.
When making actual measurements, select how to connect the measurement target to the instrument based
on its voltage and current so as to minimize the effects of instrument loss. (p.30)
Measuring the input and output efficiency of a switching power supply
1 Press and set the wiring mode to
[1P2W×2].
In this case, the switching power supply’s input and
output efficiency can be calculated as
η1(=|P2|/|P1|×100 [%]), so set the display parameter
to η1.
2 Press or to display [CH2] [W]
(P2) for [
ACDC] in area a on the display.
Press or to display [
CH1] [W]
(P1) for [
ACDC] in area b on the display.
Press to display [η1] in area c on
the display.
Output side (DC, 1P2W)Input side (AC, 1P2W)
Switching
power
supply