Measurements
R&S
®
FSW
308
User Manual 1173.9411.02 ─ 19
b) In the "Line Config" dialog box, select the "View filter" option: "Show compati-
ble".
All stored limit lines with the file extension
.LIN
in the
limits
subfolder of the
main installation folder of the instrument that are compatible to the current EMI
measurement settings are displayed in the overview.
c) Select the "Check Traces" setting for a limit line in the overview and select the
trace numbers to be included in the limit check. One limit line can be assigned
to several traces.
14. Define a suitable unit for the measured values, as the default unit dBm is not suita-
ble for EMI measurements, or select a transducer.
To change the unit:
Press the AMPT key, then select the "Amplitude Config" softkey and, in the "Ampli-
tude" dialog box, select the required unit.
To select a transducer:
a) Press the SETUP key.
b) Select the "Transducer" softkey.
c) In the "Transducer" dialog box, set the "View Filter" to "Show compatible" to
determine the available transducers for the current EMI measurement setup.
d) Select a transducer line in the overview and select the "Active" setting for it.
15. Press the RUN SINGLE key to start a new EMI measurement.
If activated, a peak search is performed. For each active marker, a final measure-
ment is performed using the specified detector for the specified dwell time. If acti-
vated, the signal is demodulated at the active marker positions.
The specified traces to be checked are compared with the active limit lines. The
status of the limit check for the final measurement is indicated in the Result Sum-
mary.
5.13.7 Measurement Example: Measuring Radio Frequency Interference
A common measurement task that you can do with the R&S
FSW EMI measurement is
to detect radio frequency interference (RFI) or electromagnetic interferences (EMI).
The measurement shows signal levels over a particular frequency range. A typical fre-
quency range for EMI measurements is 150
kHz to 1
GHz. As the captured signal
characteristics will most likely be unknown, the best way to start the measurement is to
preset the R&S
FSW and perform a peak search to obtain a general overview.
If you perform measurements according to a particular EMI standard, a preset also
eliminates the risk of wrong settings inherited from previous measurements. Note that
EMI measurements are possible in the Spectrum application only.
Preparing the measurement
1. Press the PRESET key.
The R&S
FSW restores the default settings.
Electromagnetic Interference (EMI) Measurement (R&S
FSW-K54)
