ADInstruments AD2811 Instruction Manual page 14

AD Instruments
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the test leads specified for the simplified measurement.
(5) Rx = Re – re
Fig. 2
Rx = True earth resistance
Re = Indicated value
re = Earth resistance or earth electrode.
(6) Since the measuring current is as low as 2mA, the earth leakage breaker
(ELCB) does not trip even if the earth side of the commercial power supply with
an ELCB is used.
* Follow the proper connection as shown in Fig. 1. The LED (red)
indicator will be lit. This proves that a correct current circulation is
under its operation.
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Manual de usuario AD4120ER