Kikusui TOS9200, Руководство по эксплуатации

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2-4 Precautions on Handling TOS9200/9201
2.4 Warning for Residual High Voltages
• In DC withstanding v oltage testing and insulation resistance testing, the
test leadwire , test probe , and DUT are charged to a high v oltage . The
tester is equipped with a discharge circuit, b ut some time is nonetheless
required to discharge them after the output is cut off . There is a danger of
electr ic shoc k dur ing discharge . T o a v oid electr ic shoc k, tak e the utmost
care to ensure that the DUT , test leadwire , probe , and highly charged par ts
around the output ter minal are not touched. If it is necessar y to touch
them, be sure to con fi r m both (a) and (b):
(a) The analog v oltmeter indicates “z ero . ”
(b) The D ANGER lamp has gone out.
•
As soon as the output is cut off , the tester’ s discharge circuit star ts f orced
discharging. Do not disconnect the DUT dur ing a test or
pr ior to completion of discharging.
Disc harge time
The length of the discharge time varies according to the properties of the DUT and
the test voltage.
Discharge is conducted at a resistance of approximately 125 k
Ω in DC withstanding
voltage testing, and at 25 k
Ω
in insulation resistance testing.
When no DUT is connected, the tester itself requires the following lengths of time
to reduce the internal capacitor voltage to 30 V.
Assuming that a 0.05 μ F capacitor is tested, the following lengths of time are
required to reduce the charge to 30 V.
If the DUT is disconnected during a test or before the completion of discharging,
assuming that the DUT has a capacity of 0.01 μ F and a parallel resistance of 100
M
Ω
, approximately 5.3 seconds at 6 kV and approximately 3.5 seconds at 1 kV are
required for the DUT to discharge to 30 V.
When the approximate time constant of the DUT is known, the time required for
discharging to 30 V after the output is cut off is calculated as the time constant times
the value given above.
• Insulation resistance testing at 1 000 V: Approximately 0.5 ms
• DC withstanding voltage testing at 6 kV: Approximately 5 ms
• Insulation resistance testing at 1 000 V: Approximately 5 ms
• DC withstanding voltage testing at 6 kV: Approximately 40 ms
WARNING