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2.9 PV
Ω
Measurement
• Insulation resistance is a ratio of a voltage applied and
a leakage current. Indication values are not sometimes
stable depending on the object to be measured but it is
not a failure.
• The MEASURE key should be fully pressed until the
hot-line warning indication lights. Insufficient press
may result in an incorrect measurement.
• After using this instrument, turn OFF the rotary switch.
• When you test an electrical line connected to
equipment having a withstand voltage lower than the
test voltage or equipment/part with an unknown
withstand voltage, it is recommended to make any
measurement after they are disconnected from the
line.
• As solar panel to ground capacitance is larger, it may
take time until measured values become stable.
• The PVΩ measurement function does not comply with
EN61557 requirements. To perform measurements in
conformity with EN61557, select the insulation
resistance range.
• If open voltage of solar cell string is higher than test
voltage, accurate measurement cannot be achieved.
PVΩ500 V range should be used with an open voltage
500 V or lower and PVΩ1000 V range for an open
voltage 1000 V or lower.
• If a voltage higher than test voltage is being generated,
no measurement is available.
•As PVΩ measurement uses a current-limiting resistor
of 1 MΩ connected to EARTH terminal, the output
voltage is divided by the 1 MΩ resistor and the resistor
connected between the measuring terminals. For
example, when a 10MΩ resistor is used, the output
voltage is divided by 1 MΩ and 10 MΩ.
• During hours such as in the nighttime while a solar
panel is not generating power, make measurements
with P-N shorted.
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