Rohde & Schwarz FSW13, Руководство пользователя

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Measurements
R&S
®
FSW
307 User Manual 1173.9411.02 ─ 19
The EMI main menu is displayed.
5. 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 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 peak values in the input signal during the initial measure-
ment, activate the "Auto Peak Search".
As soon as a sweep is started, the R&S FSW looks for the strongest peaks in the
frequency range you are measuring and positions one of the active markers on
those peaks. The number of active markers determines the number of detected
peaks; no additional markers are activated.
8. Define the type of scaling for the frequency axis according to the definition of the
limit lines in the standard.
9. Optionally, select the "LISN Config" softkey to configure a LISN control.
10. Configure the EMI measurement markers.
a) Select the "Marker Config" softkey and activate the number of markers or delta
markers you want to analyze.
b) For each active marker, select a detector to be used for the "Final Test", i.e. the
subsequent EMI measurement at the marker position.
c) If you already know which frequencies cause irregular values, set the markers
to those positions. (Otherwise perform an initial peak search to obtain an over-
view, see
step 7 ).
11. Optionally, select the "Marker Demod Config" softkey to configure continuous
marker demodulation.
Demodulation begins immediately with the next measurement. During the initial
measurement, demodulation is performed for the entire measurement span; during
the final measurement only the detected peak marker positions are demodulated
(for the defined dwell time).
12. Increase the number of sweep points for the EMI measurement.
a) Press the SWEEP key on the front panel.
b) Select the "Sweep Config" softkey.
c) Set the number of "Sweep Points" (up to 200001) so that the distance between
two sweep points is smaller than RBW/3.
13. Optionally, select or configure limit lines against which the marker results are
checked.
a) Press the LINES key and then the "Lines Config" softkey, then select the "Lines
Config" tab.
Electromagnetic Interference (EMI) Measurement (R&S FSW-K54)