MEAS Key - Receiver R&S ESCI
1166.6004.12 4.24 E-2
For generation of subrange maxima, the whole frequency range is divided into equidistant subranges. A
subrange maximum is determined for each subrange (search method SUBRANGES).
Determining the level maxima irrespective of their distribution in the frequency spectrum (search mode
PEAKS) is suitable for measurement regulations that demand determination of the relatively highest
level irrespective of the distribution in the measured frequency range, e.g. FCC.
If the prescan is performed in parallel with several detectors, typically with peak value and average
value, the maxima are determined separately for the two detectors so that the distribution of narrowband
and wideband sources of interference can be taken into account. For example, the frequency of the
maximum determined with the average detector can be used for the final measurement performed with
this detector and the frequency found in the prescan carried out with the peak detector is taken for the
final measurement using the quasi-peak detector.
Consideration of the limit lines ensures that the final measurement is not performed at frequencies at
which the inference level is far below the limit value. The margin between the acceptance line and the
limit line can be selected by the user in dB as the MARGIN. Each limit line is allocated to a trace, i.e.
different limit lines are taken for the different detectors.
Two values should therefore be defined for this purpose:
• the number of subranges or highest level values (NO OF PEAKS in the range from 1 to 500; default
value: 25)
• the acceptance margin (MARGIN; default value: 6 dB). It is valid for all limit lines.
As an alternative method, it is possible to preset a list of frequencies at which the final measurements
are performed. A typical application is, for example, the statistical analysis of several units.
The peak list can be either edited manually or can be filled with desired values by adopting the marker
values.
If no limit lines are activated, the measurement procedure is as if all measured values would exceed the
limit line.
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