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Dran-View 6 User Guide

Harmonics

Setup Page

(Continued)

Harmonics calculation method – Enterprise Edition Only

Select how you wish harmonics to be calculated. This option is not

available to phasors, which always uses the "Min/Max/Avg one cycle

values" mode.

Avg of one-cycle

values

This option calculates each cycle individually, and

presents the average values for each channel. This

mode is significantly faster than bins or spectra if a

large number of cycles are selected. If you have DFT

charts, phasors, or text labels containing DFT data,

and changing the active event is experienced as slow,

selecting this mode may speed up Dran-View.

Min/Max/Avg of

one-cycle values

This option calculates each cycle individually, and

presents the minimum, average and maximum values

of each channel in a series each in the harmonic

channel. Phasors always use this mode. This mode is

significantly faster than bins or spectra if a large

number of cycles are selected. If you have DFT charts,

phasors, or text labels containing DFT data, and

changing the active event is experienced as slow,

selecting this mode may speed up Dran-View.

Harmonic and

interharmonic bins

This option adds (as the square root of the sum of the

squares) the interharmonics immediately next to each

harmonic to the harmonic to form a harmonic bin, and

the rest of the interharmonics to an interharmonic bin

between each harmonic. To comply with the 61000-4-

7 standard, each harmonic and interharmonic should

have a width of 5 Hz. This equals 12 cycles at 60 Hz

and 10 cycles at 50 Hz. In this mode, phase angles are

discarded.

Spectra This option presents each harmonic and interharmonic

individually. A one-cycle selection will give the basic

harmonics. A two-cycle selection will introduce an

interharmonic between each harmonic. A three-cycle

selection will introduce two interharmonics between

each harmonic, etc.

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