9. Earth resistance measurement
With the earth resistance measurement function of this instrument, earth
resistance of power distribution lines, in-house wiring system and electrical
appliances can be measured.
DANGER
● The instrument will produce a maximum voltage of about 50 V between
C (H) and E terminals at earth resistance measurement. Take enough
caution to avoid electric shock hazard.
● When measuring earth voltage, do not apply voltage greater than 600 V
between measuring terminals.
● When measuring earth resistance, do not apply voltage between
measuring terminals.
9-1 Measurement principle
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 C (current electrode), and finding out the potential difference V between
E and P (potential electrode).
Rx = V / I
Fig. 9-1
P (Potential)
Constant current generator
C (Current)
Voltmeter
E (Earth)
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