SATEC EM920 Operation Manual - Manual (Page 173)

Chapter 9 Viewing Files and Reports
Viewing Waveforms
EM920 Power Quality and Revenue Meter 173
Viewing a Frequency Plot
Click on the button to view a cycle-by-cycle frequency plot
for the sampled voltage waveforms.
Viewing a Spectrum Chart
Click on the
button to view a spectrum chart for the
selected waveform channel. PAS provides voltage, current,
active power and reactive power spectrum charts.
To change a channel, click on the window with the right
mouse button, select “Channels...”, check the channel you
want displayed, and then click OK.
Spectrum components are calculated over four cycles of the
waveform from the point where the left marker line is
located. If more than one view are open, PAS gives the
priority to the overlapped waveform view.
The order of the highest displayed harmonic component is
equal to the half sampling rate at which the waveforms are
sampled minus one.
PAS can also give you indication on whether harmonic levels
in the sampled waveforms exceed compliance limits defined
by the power quality standards or local regulations.