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PowerWatch synchronizes itself to the consecutive positive and negative zero
crossings of the AC line (every 8.33 milliseconds). Should the voltage
waveform be so highly distorted that unexpected zero crossings are detected,
PowerWatch will report a loss of synchronization relative to the measured
voltage waveform. This Loss of Synchronization will be recorded as an event
until such time as:
· the zero crossing distortion ends; or
· the reported voltage drops below 70V (a detected outage). In this
situation, the Loss of Synchronization event will change to an
Outage event
PowerWatch has a resolution of 8 seconds, so events shorter than this
duration will have a time stamp of "< 8 seconds".
See also:
Events
Impulse events
Sag events
Surge events
Outage events
Frequency events
ACR Systems Inc.
Ó 2007,
2007 ACR Systems Inc.
(while keeping the original start time and duration).
PowerWatch Operating Overview
54
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