Hioki ST4030, Instruction Manual

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231
Repeat Accuracy (Reference Value)
Oscillation waveform reproducibility
Describes the typical values of waveform variation when implementing impulse tests on the coil.
The oscillation waveform when implementing impulse tests on a low-loss 1 mH coil using 1000 V is
as described below.
Voltage [V]
First peak voltage
Second peak voltage
Third peak voltage
Time [µs]
The repeat accuracy of the peak voltages when implementing 100 consecutive tests is as described
below.
Nearly all 0.3% max.
Repeat accuracy [%]
First peak
Second peak
Third peakFourth peak Fifth peakSixth peak
Seventh peak
Note: The values shown here are typical values, and repeat accuracy cannot be assured.
Waveform variation depends greatly on the inductance, stray capacitance, linear resistance, and
core magnetic characteristics of the workpiece being tested.
For example, the peak voltage will drift a little more each time due to the increasing residual
magnetization of the magnetic core.
For good impulse test reproducibility, implement degaussing pulses a sufficient number of times so
that there is no more waveform drift.
15
Appendix