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2. Motor current measurement
l
(ii) Besides the method outlined in (i), the motor current can be
l
0
l
Due to the reactance of the motor, the current is somewhat
smoothed from pulsive waveforms into sine waves.
connect a moving-iron type of ammeter for measurement.
Transistor
amplifier V
measured by the voltage of CH34-AG on card AX04.
The output (DC output) is a result of 3-phase half-wave-
rectifying the actual current.
relationship between the actual current and voltage.
The output voltage differs according to the amplifier and
the setting plug.
When S2 is open
Transistor amplifier
TRS75
TRS150
of ammeter
The table below shows the
CH34 voltage V/Arms
Therefore,
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