Appendix
R&S
®
Cable Rider ZPH
598
User Manual 1321.0950.02 ─ 07
used by the spectrum analyzer to determine the RMS value of the measured values. It
is therefore a measure of the spectral power represented by a pixel. The sample detec-
tor takes an arbitrary measurement value and displays it (in the Fig. above, the first).
The other measured values are ignored.
On the basis of the operating principles of detectors, a few recommendations can be
made as to their use.
●
It is best to use the Auto Peak detector or the peak detector for spectrum analysis
over large frequency ranges. This ensures that all signals are displayed.
●
The RMS detector is recommended for power measurements on modulated sig-
nals. However, the display range should be chosen so as not to exceed 100 times
the bandwidth of the signal or the resolution bandwidth, whichever is larger.
●
The sample detector or the RMS detector (preferred) should be used for noise
measurements. Only these two detectors are capable of measuring noise power
correctly
●
When measurements are made on sine signals, the level display does not depend
on the detector. However, if you use the RMS detector or the sample detector,
ensure that the span is not too great. Otherwise, the displayed levels of sine sig-
nals may be lower than their true value.
How a Spectrum Analyzer Works
