57
PV Insulation Resistance Measurement Function (IR5051 Only)
5
Hold down the MEASURE key for more than one second to start
measurement.
Voltage is generated, and the mark and MEASURE key start blinking.
Do not disconnect the test leads from the terminals during the measurement.
Correct measurement is not possible.
IMPORTANT
For the PV insulation resistance measurement, press the MEASURE key after the
test leads are connected to the object under measurement. Correct measurement
is not possible if the test leads are connected to the object under measurement
when the MEASURE key has been pressed and voltage is being generated.
6
When the resistance appears, check the value.
If the indication is unstable, enable the lter function. An average of the
measured value is displayed.
See “3.5 Filter Function” (p. 47).
IMPORTANT
If there is insulation deterioration and the resistance is lower than the reference
value, do not measure the P terminal side in step 8. The PV panel may be
damaged. For the insulation resistance reference value, check in the safety
regulations and other information in advance.
7
Press the MEASURE key to end measurement.
Discharge is started, and the mark and MEASURE key start blinking.
When the voltage falls to about 30 V, the instrument stops discharging and the
mark and MEASURE key are turned o.
The mark may not be turned o when discharging is stopped because
voltage is generated from the PV cells.
When measuring for 1 min. or more, the 1-min. value can be displayed with the
or key, either during or after measurement.
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