Measurements
R&S
®
FSW
291User Manual 1173.9411.02 ─ 19
● 120 kHz
● 1 MHz (not with Quasipeak detector, see "Quasipeak detector (CISPR filter only)"
on page 292)
Military (MIL Std)
● 10 Hz
● 100 Hz
● 1 kHz
● 10 kHz
● 100 kHz
● 1 MHz
For the Quasipeak, CISPR Average, or Average RMS detector, the bandwidth is fixed
depending on the frequency. For more information see chapter 5.13.3.2, "Detectors
and Dwell Time", on page 291.
5.13.3.2 Detectors and Dwell Time
The R&S FSW EMI measurement adds new detectors to those already available with
the base unit. The additional detectors are especially designed for and required by EMI
applications.
The additional detectors are available only if the EMI (R&S FSW-K54) measurement
option is installed and the filter type "CISPR" or "MIL" is selected (see chapter 5.13.3.1,
"Resolution Bandwidth and Filter Types", on page 290). However, the EMI measure-
ment need not be active.
The detector to be used for the initial peak search is configured in the trace settings
(see chapter 7.3.2.1, "Trace Settings", on page 464), while the detector for the final
test is configured in the EMI marker settings, see chapter 5.13.4.1, "EMI Marker Con-
figuration", on page 299.
Dwell time
EMC tests often require a specific dwell time for an EMI measurement. The dwell time
defines how long the R&S FSW 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 R&S FSW EMI measurement see "Defining a Dwell Time
for the Final Measurement" on page 298.
Positive and negative peak detector
The maximum and minimum peak detectors display the maximum and minimum signal
level that was detected during the specified dwell time.
The minimum and maximum peak detectors are already available with the base unit.
Consider the following when defining the dwell time:
●
Unmodulated signals: minimum time required by the detector
Electromagnetic Interference (EMI) Measurement (R&S FSW-K54)
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