Ronde & Schwarz 1304.0004.03, Руководство пользователя

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The Spectrum Application (RF Measurements)
R&S
®
FPL1000
259 User Manual 1178.3370.02 ─ 09
For the ENV216 network, a 150 kHz high pass filter is available to protect the input of
the R&S FPL1000.
Using Transducer Factors
The R&S FPL1000 EMI measurement provides functionality to include transducer fac-
tors in the test setup. Transducers are devices like antennas, probes or current probes
that are connected to the R&S
FPL1000 to measure interferences or useful signals.
The transducer converts the measured value such as field strength, current or RFI volt-
age 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 FPL1 EMI measurement adds several predefined transducer factors. In addi-
tion you can also create new and edit existing transducer factors.
For more information see Chapter 9.7.1, "Basics on Transducer Factors" ,
on page 523 .
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 Chap-
ter 7.2.14.2, "EMI Measurement Results" , on page 251).
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
FPL1000 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 FPL1000 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.
Measurements and Results