Operation and setting
55
IRDH275_D00122_02_M_XXEN/10.2016
6.5.2 Adaptation to the system leakage capacitance
(Cemax: 150 μF)
This menu allows to adapt the ISOMETER
®
to the maximum system leakage ca-
pacitance (max. 500 μF). Please note that the basic measuring time will be in-
creased to approximately 10 seconds when the setting is C
e
= 500 μF. Factory
setting = 150 μF.
6.5.3 Changing the measuring principle from AMP to DC
(Measure: AMP)
The DC measuring principle is only suitable for pure AC systems.
Factory setting = AMP.
6.5.4 Setting the repetition time for automatic self tests
(Autotest: 24h)
The time for the repetition of automatic self tests can either be set to 1 hour
or to 24 hours or can be deactivated.
Factory setting = 24 h
6.5.5 Setting the real-time clock (Clock) (IRDH275B)
The setting of the real-time clock is the time base for the memory and for the
automatic self test. In case of failure of the supply voltage, the real-time clock
keeps running for approximately 30 days. When the device will be switched
on after this period, a flashing "C" appears on the display and the clock has to
be set again.
6.5.6 Setting the date (Date) (IRDH275B)
As well as the time, the date is required for the memory, too. In the event of
power supply failure, the date function is not influenced for at least 30 days. If
the device is switched on again after this period, a new setting of date and
time of the real-time clock is required.
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