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5.5 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 UPPER 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. In addition, even if the measured resistance value is higher than
the preset lower-limit value, "
U.F.
" may be displayed, resulting in a LOWER
FAIL. (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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