KYORITSU 6016 - Manual (Page 46)

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11. EARTH TESTS
11.1 Principles of Earth Measurement
This Earth function is to test power distribution lines, in-house wiring system, electrical
appliances etc.
This instrument makes earth resistance measurement with fall-of-potential method,
which is a method to obtain earth resistance
value Rx by applying AC constant current I
between the measurement object E (earth
electrode) and H(C) (current electrode),
and finding out the potential difference V
between E and S(P) (potential electrode).
Rx = V / I
11.2 Earth resistance Measurement
 WARNING
● The instrument will produce a maximum voltage of about 50V between
terminals E-H(C) in earth resistance function. Take enough caution to avoid
electric shock hazard.
 CAUTION
● When measuring earth resistance, do not apply voltage between measuring
terminals.
1.Select Earth function with the Rotary Switch
2.Insert the Test Leads (MODEL7228) into the instrument. (Fig.41)
3.Test Lead connection
Stick the auxiliary earth spikes S(P) and H(C) into the ground deeply. They should be
aligned at an interval of 5-10m from the earthed equipment under test. Connect the
green wire to the earthed equipment under test, the yellow wire to the auxiliary earth
spike S(P) and the red wire to the auxiliary earth spike H(C) from terminals E, S(P) and
H(C) of the instrument in order.
Fig.40
Fig.41
Red Green
Yellow