13
Note
: The clamps of charging and receiving are not
interchangeable.
3
、
Two-clamp method measure the independent grounding
objection
A
．
There must be an effective closed-loop for two-clamp
method in the testing process The solution is to find an auxiliary
electrode, and link the tested grounding objection with well
grounding system (such as water pipes, etc.) Then clamp the two
clamps on the wire with a distance of 30cm. Then enter the double
clamp interface by pushing button “double clamp” and get the value
by pushing “test” button. Different method can be chosen under
different conditions in measuring independent grounding
resistance.
B
．
The grounding resistance can be measured when the
devices are in lower floors (the ground floor or second floor).
C. Devices in a higher floor can use "independent grounding"
test method. The grounding resistance of water pipe is assumed to
be zero of the theory. But it is not true. So the value R
A
should be
obtained with "independent grounding" test methods and then the
resistance R
B
of water pipe get measured with the same method
and then been subtracted from R
A
.
Figure 5
