12
metal auxiliary earthing object when making measurement.
Earth ground resistance simple testing wire connection is as following
figure, and refer to precision measurement for other operations.
Simple method for measurement of earth ground resistance, its reading
on Tester is the total value of earth ground resistance value of measured
earthing object and that of commercial earthing object, namely:
RE=RX
＋
re
In which:
RE
is the Tester reading value;
RX
is the earth ground resistance value of measured earthing
object;
re
is the earth ground resistance value of common earthing
object like commercial use power system.
Then, the earth ground resistance value of measured earthing object is:
RX=RE
－
re
Adopting simple method for measurement of earth ground resistance
shall try to select the earthing object with low value as the auxiliary earth
ground electrode, then 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.
Note
Simple method for measurement of earth ground resistance also needs
to confirm that voltage value to ground must be lower than 10V. If the
voltage value is over 10V, the measurement value of earth ground
resistance may cause error and at that time, it shall firstly cut off power
on measured earthing equipment and make resistance measurement
after the earthing voltage is decreased.
7
．
Backlight Control
After startup, press
“
“
button to turn on or off backlight. The backlight
function is suitable to dark spot. It will default backlight turn-off for each
startup.
Summary of Contents for ES3010
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