5-27
IM 253710-01E
Setting the Measurement Mode and Range
5
Explanation
The following two types of filters are available on the power measurement module. For
selecting the input filter of the motor module, see section 15.3.
Selecting the line filter
The line filter is inserted into the circuit under measurement. It removes the noise
from the inverter and from distorted waveforms. The cutoff frequency can be selected
from the following choices. Selecting OFF disables the filter.
OFF, 500 Hz, 20 kHz, 1 MHz
Selecting the zero crossing filter
This filter is inserted only into the frequency measurement circuit. Zero crossing
refers to the input signal crossing the center value of the amplitude of the input signal.
This filter is used to accurately detect the zero crossing point. This instrument detects
the zero crossing point with a hysteresis of approximately 3.5% of the measurement
range. The cutoff frequency can be selected from the following choices. When the
zero crossing filter is OFF and the line filter (above) is ON, the cutoff frequency
specified by the line filter is used as a zero crossing filter.
OFF, 500 Hz, 20 kHz
5.6 Selecting the Input Filter