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R&S FSH
Spectrum Analyzer Mode
Using Transducer Factors
3.4 Using Transducer Factors
The frequency-dependent transducer factor of transducers and antennas can be
directly considered in the measurement result. A transducer factor consists of a
numeric value and a unit. The R&S FSH corrects the level values of the trace by the
values of the transducer. At the same time, the unit of the transducer is assigned to the
level axis. When field-strength measurements are performed with the aid of antennas,
for instance, the electrical field strength is directly indicated in dBµV/m on the
R&S FSH. A transducer factor can also be used to correct a frequency-dependent
attenuation, e.g. of a cable between DUT and RF input of the R&S FSH.
You can create and edit transducer factor with the R&S FSH4View software package
and then transfer them into the internal memory of the R&S FSH. Each transducer
factor may consist of up to 1000 reference values.
For more information see "Managing Datasets" on page 21.
Interpolation between the values is performed with the aid of a modified spline
algorithm. Even if only relatively few values such as maxima, minima and turning
points are available, this algorithm can easily simulate the correction factors of
common transducers. Two transducers can be switched on at a time. The second
transducer must be assigned the unit dB. The R&S FSH adds the two transducers to a
total transducer.
Units supported for transducer factors:
●
●
●
●
dB
dBµV/m
dBµA/m
W/m2
The unit dB does not change the unit set on the R&S FSH. It can be used, for instance,
to compensate for frequency-dependent loss and gain at the input of the R&S FSH.
The units dBµV/m and dBµA/m convert the output power of an antenna into electric or
magnetic field strength. The unit W/m2 is used to calculate and display the power flux
density.
For example, to compensate for the cable loss between the transducer and the RF
input, the R&S FSH can use two transducers at the same time. One of them must have
the unit dB, however, i.e. it must correspond to one loss or gain value.
► Press the AMPT key.
► Press the "Transducer" softkey.
Transducer factor availability
Transducer factors are not available for measurements with the tracking generator or
the Power Sensors. The "Transducer" softkey is therefore inactive.
You can select two transducer factors, a primary transducer and a secondary
transducer. If a transducer factor is active, the menu item has an [X] in front of it.
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