28
GMC-I Messtechnik GmbH
10.1
Measuring with Probe
Earth Resistance Measurement with Probe (Mains Powered) – Connection Circuit Diagram
Key
R
B
Operational earth
R
E
Earth resistance
R
X
Earth resistance via equipotential bonding systems
R
S
Probe resistance
PAS
Equipotential bonding strip
RE
Overall earth resistance (R
E1
//R
E2
//water pipe)
Measurement R
E
Select the Measuring Function
Connection
Connected components:
2-pole adapter and probe
Set parameters
q
Measuring range:
AUTO,
10 k
(4 mA), 1 k
(40 mA), 100
(0,4 A), 10
(> 0.65 A)
In systems with RCCBs, resistance and/or test current must
be chosen such that they are below the tripping current
(½ I
N
).
q
Connection type:
2 pole a probe
q
Contact voltage:
UL < 25 V, < 50 V, < 65 V, freely adjustable
voltage, see section 5.7
q
Transformer ratio:
without significance in this case
Start Measurement
Note
The following diagram appears if the
2-pole adapter is connected
incorrectly.
PRO
FITE
ST
wa
ter
pip
e
S
E
2
E
1
B
R
E1
U
Probe
I
----------------
=
R
E
Limit value
:
R
E
< limit value
U
L
R
L