45
Simplified Measurement for Earth Resistance
(Simplified Measurement Method, Two-pole Method)
CAUTION
•
When the device is set to two-pole method, even if it
is connected to the earth side of a commercial power
supply, it will not trigger the earth leakage breaker since
the measurement current is suppressed to 4 mA or less.
However, do not use this method for measurement at
a location where an earth leakage breaker or leakage
relay with the current sensitivity of less than 10 mA has
been installed, since such an earth leakage breaker or
leakage relay may be triggered.
• The simplified measurement function of this device is
a function for measuring earth resistance with small
inductance component.
Therefore, a resister connected in series with
inductance component of 3 mH or more may not be
accurately measured.
•
Removable sleeves are attached to the metal pins at
the ends of the test leads. To prevent a short circuit
accident, be sure to use the test leads with the sleeves
attached when performing measurements in the CAT
III measurement category. For the measurement
categories, see “Measurement categories” (p.7).
•
If the sleeves are inadvertently removed during
measurement, stop the measurement.
•
When carrying out measurements with the sleeves in
place, be careful to avoid damaging the sleeves. If the
cover cap accidentally comes off during measurement,
it should be handled carefully to avoid electric shock.
•
Since the tip of the metal pin is sharp, care needs to be
taken to avoid injury.
• L9787 is a test lead specifically designed for indoor use.
Do not use it outdoor.
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