METREL EurotestCOMBO MI 3125 User Manual

MI 3125 / BT EurotestCOMBO Measurements
51
Earth resistance measurements, common measurement procedure
* model MI 3125 BT
 Select EARTH function using the function selector switch.
 Enable and set limit value (optional).
 Connect test leads to the instrument
 Connect the item to be tested (see Figure 5.33 and Figure 5.34).
 Press the TEST key to perform the measurement.
 Store the result by pressing the MEM key (optional)*.
Figure 5.35: Example of earth resistance measurement result
Displayed results for earth resistance measurement:
R.............. Earth resistance,
Rp............ Resistance of S (potential) probe,
Rc ............ Resistance of H (current) probe.
Notes:
 High resistance of S and H probes could influence the measurement results. In
this case, “Rp” and “Rc” warnings are displayed. There is no pass / fail indication
in this case.
 High noise currents and voltages in earth could influence the measurement
results. The tester displays the “noise” warning in this case.
 Probes must be placed at sufficient distance from the measured object.
5.8 PE test terminal
It can happen that a dangerous voltage is applied to the PE wire or other accessible
metal parts. This is a very dangerous situation since the PE wire and MPEs are
considered to be earthed. An often reason for this fault is incorrect wiring (see examples
below).
When touching the TEST key in all functions that require mains supply the user
automatically performs this test.

METREL EurotestCOMBO MI 3125 Specifications

General

Brand	METREL
Model	EurotestCOMBO MI 3125
Category	Measuring Instruments
Language	English