Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
334
User Manual 1178.8520.02 ─ 08
Manual peak search
If automatic peak search is off, you can set the markers to any frequency you need
more information about manually. You can change the marker position with the rotary
knob or the cursor s, or position it to a particular frequency with the number s.
Setting markers is the same as setting markers in other spectrum measurements. For
more information, see
Searching for peaks over several traces
You can search for peaks on six traces simultaneously with a different weighting detec-
tor for each trace.
In this case, the R&S
FSV/A searches for peaks on all traces separately, if you have
assigned at least one marker to each trace.
A typical selection for EMI measurement is to use the peak and the average detector.
After initial measurement, search for peaks on the peak trace and the average trace
separately. Thus, you can consider the distribution of narrowband and wideband sour-
ces of interference.
Example:
●
In the initial measurement, determine the peak on one trace using the average
detector by assigning a marker to that trace. For the marker frequency, perform a
refined measurement using the CISPR or RMS average detector.
●
In the initial measurement, determine the peak on another trace using the peak
detector by assigning another marker to that trace. For this marker frequency, per-
form a refined measurement using the quasi-peak detector.
5.13.3.7
Final measurement at the marker position
Finding peaks with the help of an initial marker peak search reduces data to be evalu-
ated and thus measurement time. A final measurement with a special EMI detector can
then refine the initial results.
The R&S
FSV3 EMI measurement performs the final measurement automatically as
soon as a detector for the final test is defined for an EMI marker and the marker is acti-
vated. The final measurement starts immediately after the marker has been set. The
advantage of an immediate final measurement is that it eliminates the risk of measure-
ment errors based on frequency drifts of the disturbance signal.
The final measurement at the marker frequency can have a different detector than dur-
ing the initial peak search. Thus, the final measurement consumes much less time
because detectors with a long measurement time are needed only at the critical fre-
quency.
The R&S
FSV3 EMI measurement also allows you to use multiple detectors for the
final measurement. The advantage of multiple detections is that you only need one test
run to see if the results comply with the limits specified in a standard. The detectors for
the final EMI tests are defined in the marker configuration, as opposed to the
trace
detector which is used for the initial peak search.
Electromagnetic interference (EMI) measurement
