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VR101S
Users Manual
14
If the voltage exceeds the swell voltage threshold for
longer than one cycle, a swell event will be recorded.
Voltage Sags
Sags are decreases in line voltage lasting for at least ½
cycle. Sags are only measured on the hot-neutral lines.
Typically, a sag will be a few volts or tens of volts below
normal.
If the voltage drops below the sag threshold a sag event
will be recorded. If it drops to below 70Vrms the event
will be recorded as an outage.
Line Frequency Variations
Frequency variations are changes in frequency above
or below the nominal frequency (60Hz in North America,
50Hz in Europe, for example). Variations in frequency
are typically a few cycles and can be from seconds to
minutes in duration.
If the frequency drops below the minimum threshold a
low frequency event will be recorded; if it exceeds the
maximum threshold a high frequency event will be
recorded.
For a 120V recorder version the frequency will default to
60Hz.