KYORITSU 6017 - Manual (Page 25)

23
Note:
¡
When mains power supply that includes a residual current circuit breaker is
used for simplified measurement, the circuit breaker does not trip since test
current is as low as about 2mA.
¡ As only two terminals of the instrument are used in simplified measurement,
earth resistance "R
E
" of the earthed electrode connecting to terminal P will
necessarily be added to true earth resistance value "Rx":
Reading = Rx + R
E
If "R
E
" is known, obtain a true earth resistance value by subtracting "R
E
" from
the reading.
¡ In the simplified earth resistance measurement (method of using two terminals),
the reading includes the resistance of the test probes, which may be significant
on the x 1Ω range. For more accurate measurement, the resistance of the test
probes should be subtracted from the reading. To measure this resistance,
short the test probes together and press the test button to take the reading.