Kikusui IB022853, Руководство пользователя

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KPM1000 Installation and Preparation
9
Wiring the measurement circuit
This section will explain how to wire the KPM1000, AC power supply, and load.
This product is designed for use with alternating current. It cannot measure current that has a
DC component. If you try to measure an object that produces asymmetrical current
waveforms (half-wave rectified or full-wave rectified waveforms)—for example, a hair dryer—
errors will occur.
To construct the measurement circuit, you can connect the voltage input terminal to the load
or connect the current input terminal to the load. The effect of input impedance may become
large depending on the measured voltage or measured current. Select a measurement circuit
that will minimize the input impedance.
You can connect the current input terminal to the L side or the N side. Normally connect the
current input terminal to the L side, but by connecting the terminal to the N side, you can
reduce the amount of error caused by the influence of common-mode voltage.
In the following table, “r” is the KPM1000’s current input terminal (input resistance: 2 m
Ω ). “R”
is the KPM1000’s voltage input terminal (input resistance: 6 M Ω ).
WARNING
Possible electric shock. Before you connect the KPM1000 to an AC power supply, (1)
turn the KPM1000 off, and remove the power cord from the outlet, or (2) turn off the
distribution switch that is connected to the power cord.
IEC standard measurement category CAT II
• Applies to measurements on circuits directly connected to a low-voltage installation. This
category applies to measurements on circuits of equipment on the primary side of a
transformer. Such pieces of equipment have a power cord connected to a power outlet.
Examples are household appliances and portable tools.
• This product cannot be used to perform measurements in building installations. For
example, this category applies to distribution boards, circuit breakers, and wiring systems
in a fixed installation, and to stationary motors with a permanent connection to a fixed
installation. This product cannot be used to perform measurements on these objects.
Connecting the current input terminal to the
L side
Connecting the current input terminal to the
N side
Connecting
the voltage
input
terminal to
the load
Connecting
the current
input
terminal to
the load
±
±
I U
L
N
L
N
Load
AC power
supply
R
r
± ± I
U
L
N
L
N
Load
AC power
supply
R
r
±
±
I U
L
N
L
N
Load
AC power
supply
R
r
± ± I
U
L
N
L
N
Load
AC power
supply
R
r