Hioki 3390 - Measurement Examples

4.7 Viewing Efficiency and Loss Measurement Values
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4
Chapter 4 Viewing Measurement Values
Here is an efficiency and loss measurement example.
Before measuring, perform the preparations in "Chapter 3 Measurement Preparations" (p. 23)), and
make the appropriate connections and settings.
Example. The input and output sides of the switching power supply are connected to CH 1 and CH 2 of
the instrument, respectively.
4.7.3 Measurement Examples
Measuring Efficiency and Loss of a Switching Power Supply
Connection Example
Required items:
• L9438-50 Voltage Cord(2)
• 9272-10 Clamp On Sensor(1) ......input side
• 9277 Universal Clamp On CT (1) .output side
input side output side
Switching
Power Supply
Wiring Mode Setting
Calculation Formula Setting
Wiring Mode 1
[1P2W] × 4 systems
Set Pin1 to P1,
and Pout1 to P2
Calculation Formula
η1 = 100 × |P2|/|P1|
Loss1 = |P1| - |P2|