Hioki IR4053, Instruction Manual, Page: 50 / 88

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PVΩ Measurement Function (Model IR4053 and IR4055 only)
3.9 PV
Ω
Measurement Function
(Model IR4053 and IR4055 only)
This function is only available on the IR4053 and the IR4055.
This function allows accurate insulation resistance measurements
between the solar panel and ground without any influence from
power generation. For measurements between the coupling box
output terminals and ground or between power conditioner and
ground, use the normal insulation resistance range.
See “Appx. 1 Measurement Principles” (p. Appx.1)
DANGER
Do not cause a short-circuit between another wire and
the wire to be measured with the test leads. Arcs or
such grave accidents are likely to occur.
WARNING
Observe the following to avoid electric shock,
shortcircuit, or damage to the instrument.
• When measuring insulation resistance, dangerous
voltage is applied to the measurement terminals. To
avoid electric shock, do not touch the metal part of
the connecting test leads.
• Check that the connection of the measurement
terminals has been secured. If the terminal is loose,
the contact resistance will increase, resulting in
overheating, equipment burnout, or fire.
• Do not touch the measuring object immediately after
measurement. A highly charged voltage may cause
electric shock.
• Discharge the measuring object with the discharge
function of the instrument after a measurement. (p. 39)
HIOKI IR4057B961-00