(6) Press the TEST button or remote control switch to start a continuous
measurement.
Note: Sometimes the insulation resistance value takes long time until
becomes stable because the string capacitance is big.
It is possible to relatively compare the insulation resistance value of each
string taking the reading after 1 minute of testing, so without waiting for
long time until the value is stable.
The LCD shows “>2099MΩ” when the measured result exceeds
the display range (over-range).
[Display example]
(7) Press TEST or remote control switch again to stop a continuous
measurement.
PV Insulation resistance – Measurement principle
Measured value
Elapsed time
Fig. 7-4
● Influences of voltage and current
generated by PV system are
subtracted.
● Flow of current I
2
stops when
static capacitance C is fully
charged.
Resistance = Voltage / Current
RX = V / (I
1
+ I
2
)
Fig. 7-5
LINE(-) P terminal N terminal
PV
Voltage:V
EARTH(+)
StaticResistance
Current:I1
Current:I2
capacitance:C:RX
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