Measurements
R&S
®
FSW
310
User Manual 1173.9411.02 ─ 19
a) Select the "Marker Config" softkey and activate six normal markers.
b) Set markers 1 to 3 on trace 1. Set markers 4 to 6 on trace 2.
c) For each of these markers, select the "CISPR AV" detector to be used for the
"Final Test", i.e. the subsequent EMI measurement at the marker positions.
2. Select a limit line against which the marker results are checked.
a) Press the LINES key and then the "Lines Config" softkey, then select the "Lines
Config" tab.
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) In the overview, click the "Check Traces" setting for the
EN55011A
limit line
and select trace 1 to be included in the limit check. (Trace 2, which is defined
as the average, will always be lower than trace 1, which contains peak values.)
3. 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 activated, the signal is demodulated. During the initial measurement, demodula-
tion is performed for the entire measurement span; during the final measurement
only the detected peak marker positions are demodulated (for the defined dwell
time).
The specified traces to be checked are compared with the active limit line. The sta-
tus of the limit check for the final measurement is indicated in the Result Summary.
Evaluating the measurement
Check the Result Summary to detect exceeded limit values.
Zoom into the diagram at the conspicuous frequency for more details.
If necessary, decrease the span to the area in which irregular values occurred and
repeat the measurement.
5.13.8 Optimizing and Troubleshooting EMI Measurements
If the results do not meet your expectations, try the following methods to optimize the
measurement:
Number of sweep points
The resolution bandwidth should cover at least one sweep point (more is better). If this
condition is not met, signals or interferences could be missed during refined measure-
ment of narrowband interferers. See
chapter 5.13.3.3, "Frequency Resolution - Sweep
If the distance between two sweep points is larger than RBW/3, a warning is displayed
in the status bar ("Increase sweep points or RBW").
Electromagnetic Interference (EMI) Measurement (R&S
FSW-K54)
