M
MPQ1000-UG-EN Rev 6 April 2020
8
Power Factor
The ratio of the total power input, in watts, to the total volt-ampere input to the
converter.
Pre-Triggers
A user selectable value in the setup file that defines the number of cycles the
unit will record before a cycle has occurred that has exceeded the user
programmed event limits.
Rapid Voltage
Change
A variation of the rms or peak value of a voltage between two consecutive
levels that is sustained for a given durations.
Ratio
A user selectable value in the setup file that defines a value that shall be used
to multiply the recorded voltage and / or current values. This feature is used
when recording secondary values of a PT or a CT and the operator wishes to
record and view the primary value.
Response
Interval
A user selectable value in the setup file that allows the user to define the
aggregation length of each RMS calculation. Programmed in cycles.
RMS Current
The Root Mean Square value of the current, derived from the summation of
the square root of the arithmetic mean (average) of the squares of the original
current samples.
RMS Voltage
The Root Mean Square value of the voltage, derived from the summation of
the square root of the arithmetic mean (average) of the squares of the original
voltage samples.
Sag
An instantaneous or momentary decrease in the steady state RMS value.
Sample
The actual discrete instantaneous measurement the MPQ1000 performs 128
times per cycle.
Scheduled Run
A recording mode in the setup file that will allow the user to select a date and
time that the MPQ1000 will start recording.
Setup File
An electronic file that contains the measurement configuration that shall be
used by the PQ Analyzer during its recording.
Storage Interval
A selection in the MPQ1000 setup file that allows the user to determine how
often the unit wakes up from sleep mode and takes measurements.
Sub-cycle
A power quality event in which the duration is less than a cycle.
Swell
An instantaneous or momentary increase in the steady state RMS value.
TDD
Total Demand Distortion is a measurement of the current THD taking into
account the average current load on the circuit during the recording interval.
THD
The ratio of the root-mean-square of the harmonic content to the root-mean-
square value of the fundamental quantity, expressed as a percent of the
fundamental.
Transient
A sudden non-power frequency change in the steady state condition of
voltage or current.
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