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the beginning of the recording session is locked in memory and
will not be overwritten. Other users always download the recorder
before it fills up interval graph memory, which make the interval
graph overwrite setting irrelevant. The choice depends on the
application in which the Revolution will be used. The factory
default setting is for interval graph overwrite to be enabled.
The third interval graph setting allows you to choose which interval
graphs are enabled. For all Revolution power quality recorders,
you can record the following interval graphs:
• RMS voltage
• RMS current
• Real power
• Apparent power
• Reactive power
• Phase angle
• Power factor
• Displacement power factor
• Voltage THD (total harmonic distortion)
• Current THD (total harmonic distortion)
• Frequency
• IFL (Instantaneous flicker level)
• PST (Perception-short-term flicker)
The total recording time is shown by ProVision as interval graphs
are enabled and disabled during the Revolution initialization setup.
Another method to increase interval graph memory is to reduce
the number of recorded channels. If only one channel is needed
on the Revolution, changing the number of channels from four to
two, for example gives twice as much recording time.
For quantities such as power factor, phase angle, THD, etc., often
the average is much more important than the one-cycle maximum
and minimum values. The maximum and minimum traces on the
graph may be turned off so that they do not obscure the average
trace.
What the Revolution™ Records •
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