Getting Started
R&S
®
UPV
114
Getting Started 1146.2078.62 ─ 09
e) The calculation for harmonics and noise components can, if necessary, be
restricted to within band limits which can be entered in the two fields "Freq Lim
Low" and "Freq Lim Upp".
All other parameter fields are not relevant for this example. This completes the
settings in the "Analyzer Config panel".
4. Step: Displaying the measurement results – Numeric measurement display
a) In the default instrument setup, the numeric measurement display is already
open.
If the DUT is correctly connected to the audio analyzer, the measured values
for the total harmonic distortion can be read off in the first column.
In the default setup, THD+N values are given in dB; if a display in % is desired,
this unit can be changed in the "Function Config" panel.
5. Step: Displaying the spectrum in the graphical window
Display of the numeric value alone is sufficient for the majority of harmonic distor-
tion measurements. Here, however, the spectral composition of the output signal at
the DUT is also to be analyzed.
With the audio analyzer, it is possible to follow up all distortion measurements with
an FFT analysis.
The necessary settings for this are explained in the following section:
Introduction to Instrument Operation Using Examples