Fluke 43B
Applications Manual
78
The duration is usually from one cycle to a few seconds.
Spike (see Transient)
Surge (see see also Swell)
The term surge is sometimes associated with lightning-related overvoltages.
Swell
A swell is a temporary voltage increase. The duration is
usually from one cycle to a few seconds.
Total Harmonic Distortion (THD)
THD is the amount of harmonics in a signal as a percentage of the total RMS
value (THD-R) or as a percentage of the fundamental (THD-F). It is a measure
of the degree to which a waveform deviates from a purely sinusoidal form. 0%
indicates that there is no distortion. You can select THD-R or THD-F in the
instrument setup menu.
Transient
A very short and sharp increase or decrease in the
voltage (or current) on a waveform.
(Also: impulse, spike)
True Power (see Active Power)
Undervoltage
The voltage is below its nominal value on a long term
(longer than 10 cycles).
VA (see Apparent Power)
Volt Ampere
VAR (see Reactive Power)
Volt Ampere Reactive
W (see Active Power)
Watt
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