31
To make this measurement, you can choose:
either a low current which avoids any untimely tripping out of the installation but gives only the earth resistance (RA).
or a high current (TRIP mode), which yields a more accurate earth impedance (ZA) with good measurement stability.
The alarm, if activated, serves to inform the user, by an audible signal, that the measurement is above threshold, making it un-
necessary to look at the display unit to check this point.
The signal can be smoothed to produce a mean of values. But the measurement then takes longer.
3.8.3. CONFIGURING THE MEASUREMENT
Before starting the measurement, you can configure it by modifying the parameters displayed:
(Ik)
6 mA
Choice of measurement current: 6 (default), 9, 12 mA,
or TRIP to use a high current that will yield a more accurate measurement.
To compensate for the resistance of the measurement leads, for measurements of low values (see
§3.13).
The device proposes choosing the voltage for the Ik calculation from among the following values:
U
LN
(the measured voltage value),
the voltage of the old standard (for example 220 V),
the voltage of the current standard (for example 230 V).
Depending on the voltage U
LN
measured, the device proposes the following choices:
if 170<U
LN
<270 V: U
LN
, 220 V or 230 V.
if 90<U
LN
<150 V: U
LN
, 110 V or 127 V.
if 300<U
LN
<500 V: U
LN
, 380 V or 400 V.
To activate or deactivate the smoothing of the signal.
TEST
Press the
TEST
button to start the measurement. The measurement stops automatically.
This symbol invites you to wait while the measurement is in progress.
050.00
k
Ω
Ω
To deactivate the alarm.
To activate the alarm on Z
A
(in TRIP mode) or on R
A
(in non-tripping mode).
To set the alarm threshold (see §3.14). As default,
the threshold is set to 50
W
.
Z-R
Ik
010.00
A
k A
To activate the alarm on Ik (in TRIP mode only).
To set the alarm threshold (see §3.14). As default,
the threshold is set to 10 kA.
