Kikusui TOS8030 - Appendix; Improvements in Waveform Obtained Using a Zero-Start Switch; A.1 Improvements in Waveform Obtained Using a Zero-Start Switch

50 Appendix TOS8030
Appendix
Provides guidelines for zero-start switch.
A.1 Improvements in Waveform Obtained Using
a Zero-start Switch
In the withstanding voltage tester, opening and closing the primary side of the high
voltage transformer with a contact switch opens and closes the primary winding,
distorting the output waveform. This results in the application of unnecessarily high
voltage to the DUT, potentially damaging the DUT or resulting in a FAIL assess-
ment for a good DUT.
To reduce distortion of test voltage waveforms, the TOS8030 tester uses a zero-start
switch semiconductor to open or close a circuit when the supply voltage is near 0 V.
Fig. A-1 Improvements in Waveform Obtained Using the Zero-start
Switch
START
STOP
The period when a test is executed.
Test voltage
waveform obtained
using a mechanical
relay
Test voltage
waveform obtained
using the zero-
start switch