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CH 4/ Setup Monitoring
RMS Variation
RMS variation
setup properties
RMS stands for root mean square, a mathematical formula used to compute the
equivalent value of the voltage and current. Voltage and current changes are measured
and checked against the programmed limits. Thresholds are set as high limits (threshold
above the programmed limit) and low limits (threshold below the programmed limit).
RMS variations result whenever voltage or current rms value rise above or fall below
the programmed threshold limits. The limits determine how sensitive the instrument
should be. Note that statistical and trending information is always captured regardless
of the limit settings, so you will never be without a data even if limits are not set to the
ideal values.
HDPQ Xplorer allows you to set the limits for each of the triggers, as well as the
amount of rms value (in cycles) to record before and after the trigger cycle.
RMS trigger
parameters
In order for the instrument to trigger on rms variation, any of the enabled and
programmed voltage and/or current channel must go above the High Limit or below the
Low Limit for a period of at least one rms value (which are computed twice per cycle
with a one cycle sliding integration window).
The aggregated disturbance end point is defined as the cycle when all channels of the
same type (voltage or current) for which triggers are enabled have come back within
limits (plus hysteresis) for a minimum duration of cycle. Until this criteria is met, any
subsequent excursions beyond the thresholds are considered part of the original
disturbance. To minimize the number of triggers recorded for a sequence of closely
spaced disturbances, hysteresis is employed in voltage thresholds.
NOTE: Hysteresis values assigned to limits are set by the system and not
programmable.
Shop for Power Metering products online at:
1.877.766.5412
www.PowerMeterStore.com
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