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6.6 PASS or FAIL Determination
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NOTE
If a current double to the preset upper-limit value is detected while performing a withstand-voltage test, the voltage
is immediately blocked by the insulation circuit, resulting in an UPPER FAIL. In such cases, the measured
current value is not displayed correctly.
When the optional "Insulation Resistance Measurement Range" function is set to "1: Auto Range", it
takes up to 1.5 s to display the resistance value. When the test finishes before the preset test time,
the test results in a LOWER FAIL.
Setting an upper-limit value while using a fixed range restricts the range of resistance that can be
measured. Therefore, even if a resistance value lower than the preset upper-limit value is measured,
"O.F." is displayed resulting in an UPPER FAIL. If the measured values have deviated from the test
conditions, the unit switches to the FAIL state. As soon as the unit switches to this state, it stops
outputting voltage. (See Section 4.3.2)
・Insulation resistance test termination mode is
enabled only in I mode. In Auto test mode or Program test mode, in which
Insulation resistance test termination mode is disabled, the unit shifts to the FAIL
state and the test is terminated. To make the unit operate in the same way as that
with a timer test termination function enabled, set a delay time.
Example of setting
For the test time of 1.0 s, set the delay time to 0.9 s.
Because screening is performed for 0.1 s, the unit operates in the same way as a
timer termination.
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