Rohde & Schwarz FSH3 - Measuring with Transducer Factors

Measuring with Transducer Factors R&S FSH3
Measuring with 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 values and a unit. The R&S FSH3
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 FSH3.
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 FSH3.
Up to 15 transducer factors with 60 reference values each can be stored in the internal CMOS-RAM of
the R&S FSH3. 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 FSH3 adds
the two transducers to a total transducer.
Transducer factors are defined with the aid of control software FSH View. They are transferred from the
PC to the instrument via the optical RS-232-C interface.
Units supported for transducer factors:
- dB
- dBµV/m
- dBµA/m
The unit dB does not change the unit set on the R&S FSH3. It can be used, for instance, to compensate
for frequency-dependent loss and gain at the input of the R&S FSH3. The units dBµV/m and dBµA/m
convert the output power of an antenna into electric or magnetic field strength.
For example, to compensate for the cable loss between the transducer and the RF input, the
R&S FSH3 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.
Operating sequence:
¾ Press the MEAS key.
¾ Press the TRANSDUCER softkey.
The softkey menu for operation of transducer factors is
displayed on the screen.
N.B : Transducer factors are not available for
measurements with the tracking generator
and the Power Sensor R&S FSH-Z1. The
TRANSDUCER softkey is therefore
interactive.
Two transducer factors can be switched on with the
TRANSD and TRANSD dB softkeys. With EXIT the
transducer menu can be quit; with TRD'S OFF all
transducer factors can be switched off.
¾ Press the TRANSD softkey.
1145.5973.12 4.82 E-6