Satec Expertmeter EM720 Operation Manual page 164

Chapter 9 Viewing Log Files and Reports
164
The order of the highest displayed harmonic component is
equal to the half sampling rate at which the waveforms
are sampled minus one. If the waveform was sampled at a
rate of 128 samples per cycle, 63 harmonics are available.
With 32 samples per cycle, only 15 harmonics are
calculated, while others will be zeros.
PAS can give you indication on whether harmonic levels in
the sampled waveforms exceed compliance limits defined
by the power quality standards or local regulations.
To review or change harmonic limits:
Click on the spectrum window with the right mouse button
and select "Limits...".
Select a harmonics standard, or select "Custom" and
specify your own harmonic limits.
Check the Enabled box to visualize harmonic faults on the
spectrum graph and in harmonic tables.
Harmonics that exceed selected compliance levels are
colored in red on the graph and in the tables.
EM720 Power Quality and Revenue Meter
Viewing Waveforms