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שאלות נפוצות
Why can one not see a duration time for a sag event?
Issue:
A sag event has occurred on an ION or PowerLogic meter, but the duration does not display through a data log viewer.

Product Line:
ION Enterprise 6.0 SP1 / SPM 7.0.1 / PME 7.x / PME 8.x

Environment:
Vista

Cause:
All meter power quality events (sag, swells, transients) have two separate 'Disturbance Start' and 'Disturbance End' timestamps.  PME uses the difference between these two to calculate the duration.  During a sag event if a meter's control power is wired in parallel to the voltage inputs this can cause the meter to only register the 'Disturbance Start' event.

Resolution:
If a duration time stamp is needed the meter should be wired with separate control power from the voltage inputs such as a battery back up.  This will ensure that if the voltage inputs should go to zero the meter will still remain powered to capture both the start and end events.

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