Operation and setting
44
TGH1361en/11.2009
5.5.2 Adaptation to the system leakage capacitance (Cemax: 150 µF)
This menu allows to adapt the A-ISOMETER® to the maximum system leak-
age capacitance (max. 500 µF). Please note that the basic measuring time will
be increased to approximately 10 seconds when the setting is C
e
= 500 µF.
Factory setting = 150 µF.
5.5.3 Changing the measuring principle from AMP to DC (Measure: AMP)
The DC measuring principle is only suitable for pure AC systems.
Factory setting = AMP.
5.5.4 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
5.5.5 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.
5.5.6 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.
5.5.7 Specifying the starting time of the automatic self test (Test) (IRDH275B)
If the 24h self test is activated in the ISO ADVANCED menu, it is possible to
set the time (hour) when the self test is to be carried out by means of the
"TEST: 12:00" sub menu. Then the self test is automatically carried out once
a day at a given time. If the 1 hour auto test has been selected, the self test
will be carried out at every full hour.
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