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2.2.1 Network voltage and frequency
Before measurements a nominal network voltage U
230/400V or 240/415V) should be selected that is valid in the area where measurements are made. This
voltage value is used for calculating the values of prospective short-circuit current.
Determination of network frequency, that is the source of potential interferences, is necessary
in order to select a proper measuring signal frequency in resistance-to-earth measurements. Only the
measurement conducted with a properly selected frequency of measuring signal will ensure optimum
filtration of interferences. The meter is designed for filtration of interferences that originate from 50 Hz
and 60 Hz networks.
2.2.2
Additional results in insulation resistance measurement
Choose the calculated absorption coefficients. The coefficients' change cause automatic setting of in-
sulation resistance measurement time periods to the following values:
AB1, AB2 – t
= 15 s, t
1
DAR, PI – t
= 30 s, t
1
= 60 s,
2
= 60 s.
2
MPI-525 – USER MANUAL
(110/190V, 115/200V, 127/220V, 220/380V,
n
By means of
,
lect a parameter to be changed, by
means of
,
select network volt-
age and frequency. Confirm a choice
made by means of ENTER push-but-
ton.
By means of
,
of the additional results of insulation
resistance measurement.
Confirm a choice made by means of
ENTER push-button.
push-buttons se-
select names
7
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