Dranetz Guide Uživatelská příručka stáhnout pdf (Strana 116)

116

Dran-View 6 User Guide

10.13.1. Harmonics Setup Page

Harmonics

Setup Page

The number of options on this page may

vary depending on where you access

these settings.

This page is found in various places in

Dran-View.

Voltage/Current/Watts

These combo boxes contain possible harmonic scaling options.

"Absolute" will not scale the harmonics. They will be displayed

as volts/amps/watts if they were not measured as a percentage.

"%FND" will scale the harmonics to % of the own channel's

fundamental, and display harmonics as %. "%RMS" will scale

the harmonics to % of the RMS value of the same quantity, and

display harmonics as %. "%Scale" will scale the harmonics to %

of a user defined number, and display harmonics as %. If you

select "%Scale", the edit box next to the combo box will be

enabled. Enter a non-zero number to scale the harmonics in this

box. These settings will also affect instrument-generated

harmonics.

Harmonics Select how many harmonics you wish to calculate from the

combo box. The maximum number of possible harmonics is the

nominal samples per cycle divided by two, rounded down to the

nearest five. Note that harmonics calculations will take more time

the more harmonics you select. If you have DFT charts, phasors.

or text labels containing DFT data, changing the active event may

be experienced as slow. Decreasing this number may speed up

Dran-View.

Harmonics in

THD

Select how many harmonics to use in THD calculations. As a rule

of thumb (and some standards), you should use 40 harmonics for

50 Hz and 50 harmonics for 60 Hz.

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