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•
Harmonic Number: For alarm parameters, Vh, Ah, Uh, and VAh, selects
which harmonic number is being used as an alarm condition. For example,
Vh with a harmonic number of 2, will only look at Voltage phase to neutral,
harmonic 2.
•
Phases: Some alarm conditions have a phase selection. W, VAR, and VA,
have a choice of "3L" (each individual phase), or "Sum" which is the sum of
phases. DPF, PF, and TAN have the choice of "3L" (each individual phase),
or "Mean" which is the mean of phases.
•
Threshold: The value that must be reached to start an alarm. For ">"
alarms, the value or higher must be reached, for "<" alarms, the value or
lower must be reached.
•
Duration: The Alarm will only be recorded if the duration of the parameter
meeting the threshold criteria exceeds the duration. The minimum alarm
duration can be in minutes or seconds. In the case of Vrms, Urms or Arms
not using neutral current, can also be in hundredths of a second.
For Vrms, Urms, and Arms, it can be useful to set a duration of 0 seconds. In
that case an event as short as a half cycle can be detected (8 milliseconds at
60Hz). For all other parameters, the minimum duration that can be detected
is 1 second.
•
Hysteresis: This value for alarms is set to prevent multiple recordings of
an event that goes above the threshold and a certain percentage below it at
times.
Example: Alarm threshold is 100 Volts or higher, hysteresis is 1%. When the
voltage goes up to 100V, the alarm condition starts. When it goes back down to
99V, the alarm condition stops.
NOTE: You can configure alarms, recordings, inrush, and transient searches while
testing is in progress.
Shop for AEMC products online at:
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Power Quality Analyzer Model 8335
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