46
PVΩ Measurement Function (Model IR4053 and IR4055 only)
• Insulation resistance is the ratio of applied voltage to leakage
current. Displayed value may not stabilize depending on the
measuring object, but it is not a failure of the instrument.
• Press the MEASURE key fully down until a live circuit indicator
lights up. If the button is not pressed down fully, a proper
measurement cannot be made.
• Turn off the rotary switch after use.
• Disconnection when measuring is recommended of any
equipment having a lower withstanding voltage than the test
voltage, or equipment or parts having an unknown withstanding
voltage connected to the circuit to be measured.
• The ground capacitance of the solar battery panel is high,
therefore the measured values may take some time to stabilize.
• Accurate measurements are not possible when open voltage
of the solar battery string is higher than the test voltage. Use
the PV
Ω
500 V range for open voltage 500V or less and PV
Ω
1000 V range for open voltage 1000 V or less.
• If a voltage higher than the test voltage is detected, the buzzer
sounds and measurement is not possible.
• Use an insulation resistance range other than PV
Ω
to perform
measurements by shorting P and N.
• Perform measurements by shorting P and N when the solar
battery panel is not generating power, such as during the night.
• For the PV
Ω
measurement function, the output voltage is
divided by the 1 M
Ω
resistor and the resistor connected
between measurement terminals because a 1 M
Ω
current
limiting resistor is connected to the EARTH terminal.
Example: When a 10 M
Ω
resistor is measured, the voltage is
divided by 1 M
Ω
and 10 M
Ω
.
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