General Instrument Setup
R&S
®
FSW
566
User Manual 1173.9411.02 ─ 19
The results are available until the next self-alignment process is started or the instru-
ment is switched off.
Temperature check
During self-alignment, the instrument's (frontend) temperature is also measured (as
soon as the instrument has warmed up completely). This temperature is used as a ref-
erence for a continuous temperature check during operation. If the current temperature
deviates from the stored self-alignment temperature by a certain degree, a warning is
displayed in the status bar indicating the resulting deviation in the measured power lev-
els. A status bit in the
STATUs:QUEStionable:TEMPerature
register indicates a
possible deviation. The current temperature of the RF Frontend can be queried using a
remote command (see
Touchscreen alignment
When the device is delivered, the touchscreen is initially calibrated. However, to
ensure that the touchscreen responds to the finger contact correctly, a touchscreen
alignment is required.
Alignment of the touchscreen is useful:
●
At first use
●
After an image update or after exchanging a hard disk
●
If you notice that touching a specific point on the screen does not achieve the cor-
rect response
●
If the position of the instrument has been changed and you cannot look straight on
the screen
●
If another person operates the instrument
9.2 Basics on Transducer Factors
The transducer allows you to manipulate the trace at discrete trace points to correct
the signal coming from an input device. Transducers are often used to correct the fre-
quency response for antennas, for example. The transducer is configured by defining
transducer factors for specific trace points. A set of transducer factors defines an inter-
polated transducer line and can be stored on the instrument.
In the Spectrum application, the correction factor from all active transducers is calcula-
ted for each displayed trace point once in advance and is added to the result of the
level measurement during the sweep. If the sweep range changes, the correction val-
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
Basics on Transducer Factors
