Measurements
R&S
®
RTE
365User Manual 1326.1032.02 ─ 20
Meas. type Description, result
THD_f, THD_a,
THD_u, THD_r
Total harmonic distor-
tion
These measurements require option R&S RTE-K18 Spectrum Analysis.
THD_f is the root mean square of the sum of all amplitudes of the har-
monic waves in relation to the amplitude at the fundamental frequency
(first harmonic):
THD_a corresponds to THD[dB]:
THD_u:
Distortion factor:
Where:
●
U
i
: effective value of the harmonic with index i
●
U
1
: effective value of the first harmonic
●
U: effective value of the signal
Peak list This measurement requires option R&S RTE-K18 Spectrum Analysis.
Table with measured peaks. For each peak, the frequency and the
power value are listed in a table row. The number of determined peaks
can be defined. You can sort the results by frequency or power value,
and the peak labels are adjusted accordingly.
Harmonic search Table with measured harmonics. For each harmonic, the frequency and
the value are listed in a table row.
For remote command parameters and suffix types, see Table 18-7.
8.2.7.2 Settings for spectrum measurements
Access: "Meas" menu > "Setup" > "Spectrum" category
Spectrum measurements require a source in the frequency domain, i.e. a math wave-
form with an FFT operation.
For spectrum measurements, make sure that the start frequency and other FFT
parameters are set correctly, and the fundamentals are not covered by the DC compo-
nent of the signal. Consider also a gated measurement if the instrument cannot return
any result.
Automatic measurements
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