− 8 −
Procedure :
①
Connect the LINE lead (Red) and EARTH (ground) lead (Black).
②
Set the function switch to AC/DC V.
③
Connect the test leads to the object measured.
④
Read the displayed value (there is no need of pressing the TEST button).
In the DCV measurement, the “−” sign is displayed when the
Red lead is connected to negative polarity.
Notes :
• When the input is absent or below 30 V, the display shows [
Lo
]
in the main value area.
• When the input is 30 V or more, whether it is an AC voltage
(ACV) or DC voltage (DCV) is distinguished and displayed
automatically.
• In case ACV and DCV are superimposed, the distinction is
based on the voltage with the higher peak value.
5-3 Insulation Resistance Measurement
1. Never apply voltage to the input terminals.
2. Wear high voltage insulation gloves.
3. Isolate the power supply to the object measured (circuit) and
make sure no voltage is applied to it before measurement.
4. Do not touch the object measured during measurement because
the tester generates a high voltage.
5. Connect the EARTH (ground) lead (Black) first and then the LINE
lead (Red). When disconnecting the test leads, disconnect
the LINE lead first.
6. The tester and measured circuit are charged with high
voltage during measurement. To avoid the risk of electric
shock, discharge the high voltage from the object
measured immediately after measurement (see
5-4
).
1. The measurement terminals of the tester generate a high
voltage during insulation resistance measurement.
2. Some objects measured have unstable insulation resistance, in
which case their readings become also unstable. The measurement
of a capacitive load may sometimes take a long time.
3. In the insulation resistance measurement, the EARTH (ground)
terminal becomes “+” and the LINE terminal “−”.
WARNING
CAUTION