Manual

60 Gossen Metrawatt GmbH
15.1 Earthing Resistance Measurement – Mains Powered
The following types of measurement and connection are possible:
• 2-wire measurement via 2-pole adapter
• 2-pole measurement via earthing contact plug
(not possible in IT systems)
• 3-wire measurement via 2-pole adapter and
probe
• Selective measurement: 2-pole measurement
with probe
and current clamp sensor
At left in figure:
2-pole measuring
adapter for con-
tacting PE and L
measuring points
At right in figure:
The PRO-Schuko
measuring
adapter can be
used as an alter-
native.
Select Measuring Function
Select Operating Mode
The selected operating mode is displayed inversely:
mains~ in white against a black background.
Special Case: Manual Measuring Range Selection (test current
selection)
(R  AUTO, R = 10 k (4 mA), 1 k (40 mA), 100  (0,4 A),
10  (3.7 … 7 A), 10 /U
E
)
Note
When the measuring range is selected manually, accuracy val-
ues are only valid starting at 5% of the upper limit range value
(except for the 10 W range; separate display for small values).
Set Parameters
❏ Measuring range: AUTO
10 k (4 mA), 1 k (40 mA), 100  (0.4 A), 10  (> 3.7 A)
In systems with RCCBs, resistance or test current must be se-
lected such that it is less than tripping current (½ I
N
).
❏ Touch voltage: UL < 25 V, < 50 V, < 65 V, see section 10.8 re-
garding freely selectable voltage
❏ Transformer ratio: depends on utilized current clamp sensor
❏ Connection: 2-pole adapter, 2-pole adapter + probe,
2-pole adapter + clamp meter
❏ System type: TN or TT
❏ Test current waveform
See section 15.4 through section 15.6 regarding advisable
parameters for the respective measurement and connection
types.
Performing Measurements
See section 15.4 through section 15.6.
15.2 Earthing Resistance Measurement – Battery Powered,
“Battery Mode” (PROFITEST MPRO & PROFITEST MXTRA
only)
The 5 following types of measurement and connection are possi-
ble:
• 3-wire measurement via PRO-RE adapter
• 4-wire measurement via PRO-RE adapter
• Selective measurement with clamp meter (4-
pole)
via PRO-RE adapter
• 2-clamp measurement via PRO-RE/2 adapter
• Measurement of soil resistivity

E
via PRO-RE adapter
Figure at right:
PRO-RE adapter for connect-
ing earth electrode, auxiliary
earth electrode, probe and
auxiliary probe to the test
instrument for
3/4-pole measurement,
selective measurement and
measurement of soil resistivity
Figure at right:
PRO-RE/2 measuring adapter as
accessory for connecting the E-
Clip 2 generator clamp for 2-clamp
measurement and earth loop resis-
tance measurement.
Select Measuring Function
Select Operating Mode
The selected operating mode is displayed inversely:
white battery icon against black background.
Set Parameters
❏ Measuring range: AUTO, 50 k, 20 kW, 2 kW, 200 W, 20 W
❏ Current clamp sensor transformer ratio:
1:1 (1 V/A,) 1:10 (100 mV/A), 1:100 (10 mV/A), 1:1000 (1 mV/A)
❏ Connection: 3-pole, 4-pole, selective, 2-clamp, 
E
(Rho)
❏ Distance d (for measuring

E
): xx m
See section 15.7 through section 15.11 regarding advisable
parameters for the respective measurement and connection
types.
Performing Measurements
See section 15.7 through section 15.11.
R
E
R
E