Datakom DKM-411, Руководство пользователя, Страница: 44 / 91

DKM-411 User Manual Rev_01 Firmware V-1.0
K46D03-EN - 44 -
The harmonic analyzer consists on a Fast Fourier Transform (FFT) algorithm which is run twice a second
on all channels.
The sample memory is 1024 samples long and 13 bits resolution with a sampling rate of 8192 s/s.
The theory says that a periodic signal may have only odd multiples of the main frequency. Thus in a 50Hz
network, harmonics will be found only at 150, 250, 350, 450 Hz etc...
The unit is able to analyze up to 3600Hz and up to 63rd harmonic, whichever is smaller. Thus in a 50Hz
system all 63 harmonics will be displayed, but in a 60Hz system only 59 harmonics will come to the
screen.
Graphical Harmonic Table Alphanumeric Harmonics Table
Harmonics are represented by 2 different ways on the device display. The first one is a graphical
representation allowing perception of the harmonic structure at a glance.
The second display is alphanumeric, thus all harmonics are displayed with 0.1% resolution in order to
provide more accurate information.
On RainbowPlus program, harmonics and waveform are displayed on a single screen with more
resolution.
RainbowPlus Scada: Harmonic Analysis Display