Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
333
User Manual 1178.8520.02 ─ 08
5.13.3.5
Using transducer factors
The R&S
FSV/A EMI measurement provides functionality to include transducer factors
in the test setup. Transducers are devices like antennas, probes or current probes that
are connected to the R&S
FSV/A to measure interferences or wanted signals. The
transducer converts the measured value such as field strength, current or RFI voltage
into a voltage across 50
Ω
. During the measurement, the transducer is considered a
part of the instrument.
A transducer usually has a frequency-dependent transducer factor that includes the
frequency response of the corresponding device. During level measurement, the trans-
ducer factor automatically converts the results into the correct unit and magnitude. A
transducer factor consists of a maximum of 1001 reference values. Each reference
value includes frequency, unit and level.
The R&S
FSV/A EMI measurement adds several predefined transducer factors. In
addition, you can also create new and edit existing transducer factors.
For more information, see
Chapter 10.5.1, "Basics on transducer factors"
5.13.3.6
Initial measurement - peak search
The purpose of an initial peak search is to find signals with a high interference level
quickly. The peak search is performed with a fast detector like the peak or average
detector. The initial peak search is the basis for a possible refined measurement of
interferences with the detectors specific to EMI measurements.
The results of the initial peak search are shown in the Marker Table (see
ter 5.13.2, "EMI measurement results"
Peak searches can be performed automatically or manually.
Automatic peak search
If enabled, the automatic peak search starts as soon as you select the EMI measure-
ment and one or more markers are active. During automatic peak search, the
R&S
FSV/A looks for the strongest peaks in the frequency range you are measuring
and positions a marker on those peaks after each sweep. If a
limit line
is assigned to
the trace, the peak search is based on the level difference between the trace and the
limit line. For each active marker, a peak is searched. You can use up to 16 markers
simultaneously.
The largest peak is always assigned to the active marker with the lowest number; sub-
sequent peaks are assigned to the active markers in ascending order.
The R&S
FSV/A allows you to distribute markers among several traces. If you do so,
the marker with the lowest number assigned to a particular trace is positioned on the
largest peak of the corresponding trace.
Electromagnetic interference (EMI) measurement
