4 System
4.6 Alignments
4.6.6 Advanced
Accesses alignment processes that are immediate action operations that perform
operations that run until complete. Advanced alignments are performed on an
irregular basis, or require additional operator interaction.
Dependencies Not available in UXM
4.6.6.1 Characterize Preselector
The Preselector tuning curve drifts over temperature and time. Recognize that the
Amplitude, Presel Center function adjusts the preselector for accurate amplitude
measurements at an individual frequency. Characterize Preselector improves the
amplitude accuracy by ensuring the Preselector is approximately centered at all
frequencies without the use of the Amplitude, Presel Center function. Characterize
Preselector can be useful in situations where absolute amplitude accuracy is not of
utmost importance, and the throughput savings or convenience of not performing a
Presel Center is desired. Presel Center is required prior to any measurement for best
(and warranted) amplitude accuracy.
Keysight recommends that the Characterize Preselector operation be performed
yearly as part of any calibration, but performing this operation every three months
can be worthwhile.
Characterize Preselector immediately executes a characterization of the Preselector,
which is a YIG-tuned filter (YTF). The instrument stops any measurement currently
underway, performs the characterization, then restarts the measurement from the
beginning (similar to pressing the Restart key).
The query (:CALibration:YTF?) invokes the alignment of the YTF subsystem, and
returns a success or failure value.
A failure encountered during alignment generates the Error Condition message
“Characterize Preselector failure” and sets Bit 3 in the
STATus:QUEStionable:CALibration:EXTended:FAILure status register.
Successful completion of Characterize Preselector clears this Condition. It also
begins the elapsed time counter for Last Characterize Preselector Time, and
captures the Last Characterize Preselector Temperature.
The last Characterize Preselector Time and Temperature survives across the power
cycle, as this operation is performed infrequently.
NOTE
The Characterize Preselector function can be interrupted, by pressing the
Cancel (ESC) front-panel key, or remotely with Device Clear followed by the
:ABORt SCPI command. None of the new characterization data is then used.
1843 Short Range Comms & IoT Mode User's &Programmer's Reference
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