Measurements
R&S
®
FSW
288User Manual 1173.9411.02 ─ 19
5.12.5 How to Determine the AM Modulation Depth
1.
Apply a modulated carrier signal to the R&S FSW input.
2.
On the R&S FSW, press the MEAS key.
3. Select the "AM Modulation Depth" measurement function from the "Select Mea-
surement" dialog box.
The calculated AM Modulation Depth is indicated in the marker information. The
markers required for calculation are displayed in the marker table.
4. If the signal changes significantly during or after the AM Modulation Depth mea-
surement, use the "Search Signals" function to start a new peak search automati-
cally and restart the calculation of the AM Modulation Depth.
5.13 Electromagnetic Interference (EMI) Measurement
(R&S FSW-K54)
The optional electromagnetic interference (EMI) measurement (R&S FSW-K54) is suit-
able for measurements according to commercial and military electromagnetic compati-
bility (EMC) standards. The functionality of the measurement is particularly useful in
research and development.
The EMI measurement features:
●
EMI marker functionality
●
Marker demodulation
●
Measurement bandwidths and detectors for EMI measurements
●
Logarithmic scaling of the frequency axis
●
Additional predefined limit lines for EMC standards
●
Predefined transducer factors
●
LISN control
5.13.1 About the EMI Measurement
EMI measurements can be very time-consuming, especially if weighting detectors are
required for the measurement. In addition, EMC testing often requires various proce-
dures to locate local EMI maxima. Such procedures are, for example, movements of
an absorbing clamp, variations in the height of the test antenna or the rotation of the
DUT.
Covering all test setups with one of the (slow) EMI weighting detectors over the
required frequency range would lead to very high measurement times.
Splitting the measurement procedure into several stages, however, can eliminate this
problem.
Electromagnetic Interference (EMI) Measurement (R&S FSW-K54)
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