20
OPERATION PROCEDURE
TOS8870A
3.4 Automatic Test
1)
Selecting a test sequence
The Tester is capable of performing a withstanding voltage test and an insulation resistance
test sequentially.
1.
Sequence is selectable for "ACW
→
IR" or "IR
→
ACW" with the FUNCTION switches.
2.
When the Tester is set for this mode, the AUTO lamp illuminates. (Letter "ACW" stands
for withstanding voltage test and letter "IR" for insulation resistance tests.)
2)
Setting the test conditions
Set the test voltages of withstanding voltage test or insulation resistance test, leakage current
detection reference values, test time, and insulation resistance judgement reference values as
in the case for the single-item tests.
3)
Connecting the DUT
1.
Make sure that the output voltmeter indication is zero.
2.
Make sure that the DANGER lamp is not illuminating.
3.
Connect the LOW test leadwire to the LOW terminal of the Tester.
4.
Connect the high voltage test leadwire to the HIGH VOLTAGE terminal.
5.
Short the high voltage test leadwire to the LOW test leadwire to make sure that no high
voltage is being delivered to the HIGH VOLTAGE terminal.
6.
Connect the LOW leadwire to the DUT.
7.
Connect the high voltage test leadwire to the DUT.
4)
Test procedure
1.
Set the Tester in the RESET state.
2.
Press the START switch.
3.
The Tester will automatically perform the two types of tests.
4.
When the test is over without the FAIL judgement, the PASS signals are generated at the
end of the test. The signals are the same with those of the single test.
When the withstanding voltage test or insulation resistance test is over with FAIL judgement,
the output voltage is instantaneously cutoff the FAIL alarm is generated, and the test is end.
The signals are the same with those of the single test.
5)
To abort the test
To abort the test being performed, press the STOP switch. The output voltage will be instan-
taneously cutoff and the Tester will be RESET state.
6)
Reapplication of test voltage (retest)
When the test is over with the PASS judgement, the Tester generates the PASS signals for
approximately 50 ms and then resets itself. The next test can be started simply by pressing the
START switch. When the Tester has generated the FAIL alarms, reset once the Tester and
then press the START switch.
7)
Checking discharge from DUT
•
In case of "ACW
→
IR" test mode, DUT is charged after testing. Be sure to check
discharge from DUT. Refer to "2.3.2 Cautions in electric charging in insulation resis-
WARNING
