KYORITSU 6017 - Manual (Page 23)

21
CAUTION
¡ When earth voltage is more than 10V, accurate earth resistance
measurement can not be made. Reduce the earth voltage, for example,
by detaching the earth electrode from the equipment that it connects to or
the disconnecting mains from the equipment.
¡ When connecting the test leads, make sure that they are separated. If the
test leads are twisted or in touch with each other, induction voltage or
current may result to affect measurement accuracy.
¡ For accurate measurement, make sure to drive the auxiliary earth spikes
in the moist part of the earth and make good test lead connection.
6-7 Simplified Measurement ( 2 POLE )
Use the pair of test probes supplied with the instrument for simplified earth
resistance measurement. This method is useful when an earth resistance is
greater than 10Ω or when is not possible to drive auxiliary earth spikes into the
earth. In this method, an approximate value of earth resistance can be measured
by using terminal E and P and, instead of the auxiliary earth spikes, existing
earthed equipment that is known to have a low earth resistance. Typical
examples are a common earth of mains power supply, an earth electrode of a
building, and metal water supply piping.
DANGER
¡ When mains power supply is used, be sure to make connection to the
earth side of the power supply in order to avoid possible shock hazard.
¡ Never touch the tips of the test probes or the circuit under test during earth
resistance measurement in order to avoid possible shock hazard. When
the test button is pressed, a voltage of up to 50V AC is supplied through
the probe leads.
1. Connect the earth probe (alligator clip on black lead) to the earth conductor of
an earthed equipment and the line probe (red) to the earth electrode under test.