Kikusui TOS9200, Operation Manual

Page: 92 / 172

3-54 Basic Operations TOS9200/9201
When the measured current fl ashes, recheck the cable connections in order to
reduce the stray capacity, and then reactivate the offset cancel function.
Offset cancel procedure
1. Connect cables exactly as they are connected in an actual AC with-
standing voltage test, but remove the DUT.
2. On the ACW1 screen, set the lower judgement function to OFF.
3. Using the SHIFT + ACW/OFFSET keys, shift to the offset measurement
screen (OFFSET). The screen displays the test voltage, test frequency,
test time, and the on/off settings for TIMER exactly as they were on the
previous screen.
4. When necessary, set the test voltage, test frequency, and test time. For
the setting procedures, see "3.4 Settings for AC Withstanding Voltage
Testing".
5. When “READY” (READY status) is displayed on the offset measure-
ment screen (OFFSET), press the START switch; offset measurement
then starts.
The tester saves the offset value that is valid when the STOP-switch is pressed or the
preset timer time has elapsed. Upon completion of the offset measurement, the
tester returns to the READY status.
On the ACW1 screen, if OFFSET is set to ON, the test result is the value obtained
by subtracting the offset value measured above from the measured current.
To check the offset value, press the SHIFT + ACW/OFFSET keys in order to return
to the offset measurement screen (OFFSET).
VOLT TIMER
5.00
kV
5.0
s
OFFSET OFFSET
FREQ TIMER ON
READY
60Hz
123
μ
A
+j
23
μ
A
REAL
IMAG
VOLT TIMER
5.00
kV
5.0
s
OFFSET OFFSET
FREQ TIMER ON
TEST
60Hz
123
μ
A
+j
23
μ
A
REAL
IMAG
Real-number portion of the measured current (REAL)
Imaginary-number portion of the measured current (IMAG)