Preamplifier - R&S ESR Series User Manual

®
R&S ESR
If a transducer is switched on it is considered as part of the unit during the measure-
ment, i.e. the measured values are displayed in the correct unit and magnitude. When
working with two measurement windows, the transducer is always assigned to two win-
dows.
The R&S ESR distinguishes between transducer factor and transducer set.
A transducer factor takes the frequency response of a single transfer element, e.g. an
antenna into consideration. A transducer set can summarize different transducer fac-
tors in several subranges (several transducer factors at the same time), e.g. an
antenna, a cable and a diplexer.
Transducer factors
A transducer factor takes the frequency response of a single transfer element into
account. It consists of a series of reference values defined with frequency, transducer
factor and the unit. For the measurement between frequency values linear or logarith-
mic interpolation of the transducer factor can be chosen. The transducer factor may
consist of up to 625 reference values.
Transducer sets
Several transducer factors can be compiled in a transducer set provided that all factors
have the same unit or unit "dB". The frequency range covered by a set can be subdivi-
ded into max. 10 subranges (each with up to 4 transducer factors) which follow each
other without a gap, i.e. the stop frequency of a subrange is the start frequency of the
next subrange.
The transducer factors used in a subrange have to fully cover the subrange.
The definition of a transducer set is recommended if different transducers are used in
the frequency range to be measured or if a cable attenuation or an amplifier has to be
taken into consideration.
If a transducer set is defined during a frequency sweep, the latter can be stopped at
the interface between two transducer ranges and the user is asked to exchange the
transducer.
A message informs that the limit has been reached. It is possible either to continue the
sweep by confirming the message or to switch off the transducer. With the automatic
switchover of the transducer used, the frequency sweep is not interrupted.
Transducer management
The R&S ESR provides functionality to store and use the transducer factors during a
measurement.
For more information on creating and managing transducer factors see
on page 507.

5.2.7 Preamplifier

Switching on the preamplifer reduces the noise figure of the R&S ESR, thus increasing
the sensitivity. The preamplifier follows the preselection filters so that the risk of an
User Manual 1175.7068.02 ─ 12
Receiver Mode
Measurement Basics
"Transducer"
175