MEWOI MEWOI4000, Руководство пользователя, Страница: 15 / 20

-12-
Simple method for measurement of earth ground resistance, its reading
on Tester is the total value of earth ground resistance value of measured
grounding object and that of commercial grounding object, namely:
RE=RX
＋
re
In which: RE is the Tester reading value;
RX is the earth ground resistance value of measured
grounding object;
re is the earth ground resistance value of common grounding
object like commercial use power system.
Then, the earth ground resistance value of measured grounding object is:
RX=RE
－
re
Adopting simple method for measurement of earth ground resistance
shall try to select the grounding object with low value as the auxiliary
earth ground electrode and thus the tester reading value can be more
approaching to true value. Please take precedence in selecting metal
water pipes, fire hydrants as auxiliary earth electrode when measuring,
and refer to the following figure for application.