Sequoia / Tahoe Series User Manual California Instruments
226 M447352-01 REV-A
Figure 5-233. Current THD Measurements
VOLTAGE THD Displays the total distortion of the output voltage. The distortion
calculation is based on the harmonic voltages, H2 through H50,
relative to the total RMS value of the voltage. Another common
definition of THD calculates the harmonics relative to the value of
the fundamental voltage H1. There might be a difference in
results depending on the harmonic content. The method is
selectable over the digital interface with the SCPI command,
MEAS:THD:MODE <value>, with the value being either RMS
(relative to total RMS) or FUND (relative to fundamental).
Figure 5-234. Voltage THD Measurements
HARMONICS Displays harmonic content of voltage and current waveforms
derived from an FFT analysis. The amplitude and phase of
harmonics up to the 50
th
(bandwidth limited) are calculated and
displayed.
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