20
MEM
HELP
Pressing the MEM key records the measurements in memory (see §6.1).
At any time, you can press the HELP key for a reminder of the functions of the keys.
3.4. Error INdICAtIoNS
The commonest error in the case of an insulation measurement is the presence of a voltage on the terminals.
The instrument can make the measurement if the peak value of this voltage is less than 0.4U
N
.
Above this value, it is necessary to eliminate the voltage and repeat the measurement.
If an external voltage appears on the terminals during the measurement, and its peak value is greater than 1.1U
N
, the measurement
is broken off and the error is indicated.
GRAPH
TEMP
After a test with programmed duration, pressing the GRAPH key displays the insulation versus time curve (see §4.5).
Pressing the TEMP key opens the temperature menu (see §4.1).