dehn EP4 Instructions For Use Manual page 19

4.3 Zero balancing
Prior to each measurement series, the EP4 continuity tester must be
calibrated together with the measuring cable (see measurement set-up 4.2).
To consider temperature influences, this is also required if the same
measuring cable is reused after a while. Zero balancing is performed
automatically for a measuring range between 10 Ω and 200 Ω with 2 – 200
mA.
⇒ Simultaneously press the
device. "CAL" is displayed and the POL +/- LED lights up.
A progress bar appears in the upper line.
⇒ Immediately position the test prod on the reference earth electrode and
ensure safe contact
⇒ Maintain contact as long as "CAL" and the progress bar are displayed.
Zero balancing is completed if +1 appears and the middle LED lights up.
The resistance of the measuring cable remains stored until a new zero
balancing is performed. The value is not deleted if the device is switched off
or the battery is replaced.
If the "ERR" message appears, zero balancing has failed and must be
repeated. This is the case if the test prod slips down or the resistance of the
measuring cable is too high (> 3.5 Ω).
⇒ The first measurement (see 4.4) should always be performed directly on
the reference earth electrode.
The result should be ≤ 0.04 Ω for both polarities.
Coiled cables may cause false measurements due to inductances.
and
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button when switching on the