Hioki 3181-01, Инструкция по эксплуатации

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Chapter 6 Applications
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CT
LOAD
PT
LOAD
SOURCE
Voltage/Current Transformer Measurement Method
6.6 Inputs Exceeding the Measurement
Range
If the voltage or current level of the equipment under
measurement exceeds the measurement range of the
3181-01, measurement should be performed after stepping
these down using a voltage transformer (PT) and/or
current transformer (CT). Refer to figure below for the
proper method of connection. Note, however, that such
transformers have a phase error which can greatly affect
the power measured value. An important consideration
has to be taken into if accurate power measurement is
required.
Power = (Watt display value)
×
(PT ratio)
×
(CT ratio)