Hioki ST4200 Instruction Manual page 90

3.10 Configuring the Band Pass Filter (for AC PD
measurement only)
During AC PD measurement, this instrument performs noise processing and signal integration processing on
the PD signal waveforms using a Digital Band Pass Filter (DBPF).
This instrument enables high-accuracy AC PD measurement insusceptible to noise by setting a BPF cutoff
frequency suitable for the noise frequency band in the environment in which the instrument is used.
First measure at the default values (fH = 1000 kHz and fL = 30 kHz). If noise affects the measurement, set the
cutoff frequency with the following procedure.
IMPORTANT
The electric charge calibration value differs depending on the band pass filter settings. When the band
pass filter settings are changed, review the electric charge calibration.
Prepare a calibration pulse generator. We recommend the following calibration pulse generators.
Fujikura Dia Cable, Ltd.
Nihon Keisokuki Seizosho Co.,Ltd
Name of manufacturer
HIOKI ST4200B971-00
9 0
Model
D-208
NPG-3