R&S ESR Series User Manual page 302

®
R&S ESR
Using Transducer Factors
For more information on transducer factors see
on page 174.
Performing a Peak Search
The purpose of a peak search is to find signals with a high interference level quickly.
Usually the peak search is done with a fast detector like the peak or average detector.
The marker peak search is the basis for a possible final evaluation of interferences with
the detectors specific to EMI measurements.
You can control markers in the
the "Marker <x>" softkey. The results of the peak search are summarized in the
Table.
There are two ways to perform a peak search, automatic and manual.
Automatic peak search
By default, the automatic peak search starts as soon as you turn on the EMI measure-
ment marker. During the peak search, the application looks for the strongest peaks in
the frequency range you are measuring and positions a marker on those peaks. When
a limit line is assigned to the trace, the level difference between the trace and the limit
line determines the peak search. The number of peaks it will find during the search
depends on the number of markers you have turned on. You can use up to 16 markers
simultaneously.
The first marker is always on the most powerful peak while the last marker is always on
the least powerful peak. If the application finds a more powerful peak, it will move one
of the markers to that position and adjust the order of the other markers.
The application allows you to distribute markers among several traces. If you do so,
the marker with the lowest number assigned to a particular trace will be positioned on
the most powerful peak of the corresponding trace.
Manual peak search
If you turn the automatic peak search off, you can put the markers manually to any fre-
quency you need more information about. You can change the marker position with the
rotary knob, the cursor keys or position it to a particular frequency with the number
keys.
Setting markers is the same as setting markers in normal spectrum mode. For more
information see the manual of the base unit.
Searching for peaks over several traces
You can measure on six traces with a different weighting detector simultaneously.
In that case, the application searches for peaks on all traces separately, given that you
have assigned at least one marker to that trace.
A typical selection for EMI measurement is to use the peak and the average detector. If
the premeasurement is done, the application would look for peaks on the peak trace
User Manual 1175.7068.02 ─ 12
Chapter 5.2.6,
Marker Configuration dialog box or turn them on with
Spectrum Measurements
Measurements
"Transducers",
Marker
299