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The Spectrum Application (RF Measurements)
R&S
®
FPL1000
254
User Manual 1178.3370.02 ─ 11
For the quasi-peak, CISPR Average, or RMS Average detector, the bandwidth is fixed
depending on the frequency. For more information, see
Detectors and Dwell Time
The EMI measurement adds new detectors to those already available with the base
unit. The additional detectors are especially designed for and required by EMI applica-
tions.
The additional detectors are available only if the EMI (R&S
FPL1-K54) measurement
option is installed. However, the EMI measurement need not be active.
The detector to be used for the initial peak search is configured in the trace settings
(see
Chapter 6.10.1.2, "Trace Settings"
on page 398). The detector for the final test is
configured in the EMI marker settings, see
Restrictions for the R&S
FPL1000 using CISPR detectors
Using the CISPR filter, specific detectors (Quasipeak, CISPR Average, RMS Average)
are available for EMI and other frequency sweep measurements (not SEM, spurious or
power measurements). However, if any of the CISPR detectors are used as trace
detectors, the following detectors cannot be used as trace detectors for other traces in
the same display:
●
Negative peak
●
Auto peak
●
Sample
If you select a CISPR detector for a trace, any traces using incompatible detectors are
automatically set to "Auto detector", which uses the positive peak detector.
If you manually set a trace to use an incompatible detector, any traces currently using
a CISPR detector are automatically set to "Auto detector".
CISPR detectors are only available under the following conditions:
●
Time domain and frequency measurements in sweep mode (not power measure-
ments, emission measurements, or statistics measurements)
●
Trigger mode "Free Run" or "External" (trigger offset
≥
0 only for "External")
●
Gate mode: "Off"
●
Linear frequency axis
If you select a CISPR trace detector while logarithmic frequency axis scaling is
active, the scaling is automatically switched to linear.
Dwell time
EMC tests often require a specific
dwell time
for an EMI measurement. The dwell time
defines how long the R&S
FPL1000 measures the signal at the individual frequencies.
Each detector needs a different period of time to fully charge and discharge; the indi-
vidual requirements on the dwell time are described for each detector. For details on
defining the dwell time for an EMI measurement, see
"Defining a dwell time for the final
Measurements and Results