User's Manual

Setting up a Measurement
Nominal/Limit Values 5
5-5
D-S-I
nominalandlimits_dsi.bmp
The detection of events (dips, swells, interruptions, rapid voltage changes) is based on
half cycle rms values or full cycle rms values updated every half cycle (whatever is
configured with the Dips, swells and interruptions based on setting).
The thresholds relate to the nominal voltage Vn.
Set the thresholds for dips and swells.
The hysteresis is recommended in the IEC 61000-4-30 Ed. 2 with 2 %; it can be turned
off with a value of 0 %. The hysteresis value is added to the preset threshold.
For example:
If the hysteresis is set to 2 %, the threshold for the beginning of dips is 90 % of Un, and
the threshold for the end of dips is 92 % of Un. For swells, the limits are 110 % and
108 %; for interruptions, 1 % and 3 %.