Measurements
R&S
®
RTP
370User Manual 1337.9952.02 ─ 12
Meas. type Description, result
THD_f, THD_a,
THD_u, THD_r
Total harmonic distor-
tion
These measurements require option R&S RTP-K37 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 RTP-K37 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.
Arithmetic Allows you to perform basic aritmetic operations between selected
measurement values and/or constant.
For details see: Chapter 8.2.5.3, "Arithmetic for amplitude/time and
spectrum measurements", on page 362
For remote command parameters and suffix types, see Table 22-8.
8.2.7.2 Settings for spectrum measurements
Access: [Meas] > "Meas Group" tab > "Spectrum" category
Spectrum measurements require a source in the frequency domain, i.e. a math wave-
form with an FFT operation.
Automatic measurements
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