Fluke 39, User Manual

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39/41B
Users Manual
22
Table 3. Screen Abbreviations (cont)
Screen Usage Name and Description
DPF
Displacement Power Factor cos
φ
fundamental
The ratio of the active power (W) to the apparent power
(VA rms) at the fundamental frequency. Equivalent to
cos
φ
at that frequency. Traditional power factor for linear
loads.
HZ Waveform Screens: Fundamental frequency in hertz
Harmonics Screens: Frequency of selected harmonic in
hertz
KF K-Factor
A load current waveform rating calculation that rates the
waveform’s capability to produce harmonic-related heat
loss in transformers and other magnetic components.
Used to select transformer K-ratings that match load
current K-factor measurements.
PF Power Factor
Ratio of active power to apparent power (including all
harmonics).True power factor for all loads, linear and
non-linear.
% THD-F Total Harmonic Distortion (as % of Fundamental)
Defines amount of harmonic distortion as a percentage
of the waveform at the fundamental frequency.
% THD - F = rms of harmonics (less fundamental)
rms of fundamental
% THD-R Total Harmonic Distortion (as % of rms total)
Defines amount of harmonic distortion as a percentage
of the rms value of waveforms at all frequencies
(fundamental and harmonics).
% THD - R = rms of harmonics (less fundamental)
total rms