General Instrument Setup
R&S
®
FSW
676
User Manual 1173.9411.02 ─ 43
ues are calculated again. If several measured values are combined in one point, only
one value is taken into consideration. If the active transducer line is not defined for the
entire sweep range, the missing values are replaced by zeroes.
When a transducer is used, the trace is shifted by a calculated factor. However, an
upward shift reduces the dynamic range for the displayed values. Thus, the reference
level can be adapted automatically to restore the original dynamic range. The refer-
ence level is shifted by the maximum transducer factor. By default, if transducers are
active the reference level function is adapted automatically to obtain the best dynamic
performance.
If a transducer factor is active, "TDF" is displayed in the channel bar.
Transducers can also be defined when an optional external mixer is used (R&S
FSW-
B21).
When using probes for RF input, transducers are automatically created according to
the probe's detected characteristics as soon as the probe is connected.
(See the R&S
FSW I/Q Analyzer and I/Q Input User Manual.)
Input from I/Q data files is imported as it was stored, including any correction factors,
for example from transducers. Any currently configured correction factors at the time of
import, however, are not applied.
Y-Axis Unit
The individual transducer factors can be defined as absolute values or relative (dB)
values. However, all factors for one transducer line use the same unit. As soon as a
transducer is activated, the unit of the transducer is automatically used for all the level
settings and outputs. The unit cannot be changed in the amplitude settings since the
R&S
FSW and the active transducer are regarded as one measuring instrument. Only
for relative transducer factors (unit dB), the unit originally set on the instrument is main-
tained and can be changed.
When all transducers have been switched off, the R&S
FSW returns to the unit that
was used before a transducer was activated.
Configuration
The R&S
FSW supports transducer lines with a maximum of 1001 data points. Eight of
the transducer lines stored in the instrument can be activated simultaneously. The
number of transducer lines stored in the instrument is only limited by the capacity of
the storage device used.
A transducer line consists of the following data:
●
A maximum of 1001 data points with a position and value
●
A unit for the values
●
A name to distinguish the transducer lines
Transducers
