Hioki 3181-01, Instruction Manual

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Chapter 3 Principle of Operation
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｛
｛
INPUT
OUTPUT
CT
PT
To A
IN
To V
IN
Power supply
To each
section
Figure 3.1-1 The Block Diagram 1
Chapter 3
Principle of Operation
3.1 Power Measurement
Figure 3.1-1 and 2 show the block diagram. The line
voltage and current of the device under measurement are
detected by a voltage transformer (PT) and current
transformer (CT), respectively. The resulting detected
signals are voltage-level converted and input to a
multiplier.
Since the DC component of the output of this
multiplier is proportional to the active power, after the
level is adjusted, this is displayed and output as the
power value.