The 928A stores power quality (PQ) records of sags
and swells as a list of dates, times, maximums and
minimums while the trigger is active. After the trigger
becomes Inactive, it will display them on the 928A.
Any one profile may consist of up to 10 Point
Limits, with each point defined over integer-multiples
of half-cycles of the nominal frequency. Configuring
point limits is straightforward, existing ones may be
adjusted and more added at a later time.
Note:
the PQ function measures RMS values only.
In the diagram below, notice that half-cycle volt-
age waveform elements have been squared, with each
half-cycle having a different maximum compared to
nominal. Also notice that these half-cycle elements
are grouped in overlapping pairs. It is the rms value
of two adjacent half-cycle elements that are compared
to the profile limits.
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Summary of Contents for 928A
Page 1: ...MODEL 928A USER S MANUAL Arbiter Systems Inc Paso Robles CA 93446 U S A ...
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Page 57: ...Channel B Combined Caution For current probe use see CT Probe Use on page 4 43 ...
Page 112: ...CT Cable Connector Figure 16 CT Cable Connector side view Figure 17 CT Connector End View 98 ...
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Page 115: ...CE Mark Certification ...
