R&S FSW Series User Manual

Measurements and Results
R&S
®
FSW
353User Manual 1173.9411.02 ─ 43
7.13.7 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.
A programming example demonstrating an EMI measurement in a remote environment
is provided in Chapter 14.5.14.8, "Programming Example: EMI Measurement",
on page 1002.
Preparing the measurement
1. Press the [PRESET] key.
The R&S FSW restores the default settings.
2. Define the frequency range of the measurement.
a) Press the [FREQ] key.
b) Press the "Start Frequency" softkey and enter a frequency of 150 kHz.
c) Press the "Stop Frequency" softkey and enter a frequency of 1 GHz.
The R&S FSW scales the horizontal axis accordingly.
3. Press the [MEAS] key on the front panel and select the "EMI" measurement.
The EMI main menu is displayed.
4. Select the "EMI Config" softkey and define the resolution bandwidth and filter type
to be used for the measurement.
By default, the R&S FSW uses a filter with a 3 db bandwidth. EMI measurements
usually require a filter with a 6R&S FSWdB bandwidth.
5. Define the dwell time for which each marker position is measured during the final
measurement.
6. To obtain an overview of exceptional values in the input signal during the initial
measurement, activate the "Auto Peak Search".
7. Select the measurement bandwidth.
a) Select the "Res BW CISPR" softkey.
A CISPR (6 dB) filter is configured.
b) Set the bandwidth to 1 MHz.
The R&S FSW shows the currently selected resolution bandwidth in the diagram
header.
Electromagnetic Interference (EMI) Measurement

R&S FSW Series Specifications

General

Brand	R&S
Model	FSW Series
Category	Measuring Instruments
Language	English