MPI-520 – USER MANUAL
2.2 Settings of measurements
Select a proper item by means of ,
push-buttons. Enter a selected
option by pressing ENTER.
2.2.1 Network voltage and frequency
Before measurements a nominal network voltage U
n
(110/190V, 115/200V, 127/220V, 220/380V,
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.
By means of , push-buttons se-
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.
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