Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
347
User Manual 1178.8520.02 ─ 08
5.13.7
Measurement example: measuring radio frequency interference
A common measurement task that you can do with the 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. Usually, the captured signal
characteristics are unknown. Thus, the best way to start the measurement is to preset
the R&S
FSV/A 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.
A programming example demonstrating an EMI measurement in a remote environment
is provided in
Chapter 12.5.13.8, "Programming example: EMI measurement"
Preparing the measurement
1. Select [PRESET] .
The R&S
FSV/A restores the default settings.
2. Define the frequency range of the measurement.
a) Select [FREQ] .
b) Select "Start Frequency".
c) Enter a frequency of
150
kHz
.
d) Select "Stop Frequency".
e) Enter a frequency of
1
GHz
.
The R&S
FSV/A scales the horizontal axis accordingly.
3. Select [MEAS] on the front panel and select the "EMI" measurement.
The EMI main menu is displayed.
4. Select the "EMI Config" .
5. Define the resolution bandwidth and filter type for the measurement.
By default, the R&S
FSV/A uses a filter with a 3-db bandwidth. EMI measurements
usually require a filter with a 6-dB bandwidth.
6. Define the dwell time for which each marker position is measured during the final
measurement.
7. To obtain an overview of exceptional values in the input signal during the initial
measurement, activate the "Auto Peak Search".
8. Select the measurement bandwidth.
a) Select the "Res BW CISPR" .
A CISPR (6
dB) filter is configured.
b) Set the bandwidth to
1
MHz
.
Electromagnetic interference (EMI) measurement
