The Spectrum Application (RF Measurements)
R&S
®
FPL1000
260
User Manual 1178.3370.02 ─ 09
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 keys, or position it to a particular frequency with the number keys.
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
FPL1000 searches for peaks on all traces separately, provided
that 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 so that the distribution of narrowband and wideband sources of interference
can be taken into account.
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 quasipeak detector.
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 intial results.
The R&S
FPL1 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 may have a different detector than
during 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
FPL1 EMI measurement also allows you to use multiple detectors for the
final measurement. The advantage of multiple detection 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.)
Measurements and Results
