MI 3101 EurotestAT: Measurements
Resistance to earth
67
bl
u
e -
N
bl
a
c
k
-
L
g
ree
n - P
E
E
H
S
R 3
E
R 4
E
MPEC
d
>5d
R
E1
R 2
E
Rp
Rc
Figure 5.33: Resistance to earth measurement – lighting protection
Resistance to earth measurement procedure
Select the
EARTH
function.
Enable and set
limit
(optional).
Connect
test cable to the instrument.
Disconnect
tested object from mains supply.
Connect
test leads to the tested object (see
figures 5.32 and 5.33
).
Press the
TEST
key.
After the measurement is finished
store
the result (optional).
Figure 5.34: Example of resistance to earth measurement result
Displayed results for earth resistance measurement:
R..............Earth resistance,
Rc............Resistance of S probe,
Rp............Resistance of H probe.
