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Gossen Metrawatt PROFITEST MXTRA Manual

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GMC-I Messtechnik GmbH 33
10.4 Earthing Resistance Measurement, Mains Powered – 3-Pole Measurement: 2-Pole Adapter with Probe
Key
R
B
Operational earth electrode
R
E
Earthing resistance
R
X
Earthing resistance through equipotential bonding sys-
tems
R
S
Probe resistance
PAS Equipotential bonding busbar
RE Overall earthing resistance (R
E1
//R
E2
//water pipe)
Measurement of R
E
Select Measuring Function
Select Operating Mode
Connection
2-pole adapter and probe are connected
Set Parameters
q Measuring range: AUTO,
10 k (4 mA), 1 k (40 mA), 100 (0.4 A), 10 (3.7 ... 7 A)
In systems with RCCBs, resistance or test current must be se-
lected such that it is less than tripping current (½ I
N
).
q Connection type: 2-pole adapter + probe
q Contact voltage: UL < 25 V, < 50 V, < 65 V, see section 5.7 re-
garding freely selectable voltage.
q Test current waveshape:
Sinusoidal (full-wave), 15 mA sinusoidal (full-wave),
DC offset and positive half-wave
q System type: TN/TT, IT
q Transformer ratio: irrelevant in this case
Start Measurement
Note
The following diagram appears if the
2-pole adapter is connected incor-
rectly.
P
R
O
F
I
T
E
S
T
W
a
t
e
r
P
i
p
e
SE
2
E
1
B
R
E1
U
Probe
I
--------------=


R
E
Limit value:
R
E
> Limit Value
U
L
R
L
… 33 …


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