4 System
4.6 Alignments
environment, the alignments occur one-ninth as often as in Normal. With these less
frequent alignments, all accuracy specifications (those expressed with ±x dB
tolerances) change by nominally a factor of 1.4.
If the condition “Align Now, All required” is set, transitioning to Auto Align, Light
performs the required alignments, clears the “Align Now, All required” condition,
and continues with further alignments as required to maintain the instrument
adequately aligned for warranted operation.
Alignment processing because of the transition to Light is executed sequentially.
Thus, *OPC? or *WAI following :CAL:AUTO LIGHT will return when the alignment
processing is complete.
When Auto Align, Light is selected, the Auto Align Off time is set to zero.
When Auto Align, Light is selected, the Settings Panel indicates Align: Light.
Partial
SCPI example :CAL:AUTO PART
Auto Align, Partial disables the full automatic alignment and the maintenance of
warranted operation for the benefit of improved measurement throughput. Accuracy
is retained for the Resolution Bandwidth filters and the IF Passband, which is critical
to FFT accuracy, demodulation, and many measurement applications. With Auto
Align set to Partial, you are now responsible for maintaining warranted operation by
updating the alignments when they expire. The Auto Align, Alert mechanism will
notify you when alignments have expired. One solution to expired alignments is to
perform the Align All, Now operation. Another is to return the Auto Align selection to
Normal.
Auto Align, Partial is recommended for measurements where the throughput is so
important that a few percent of improvement is more valued than an increase in the
accuracy errors of a few tenths of a decibel. One good application of Auto Align,
Partial would be an automated environment where the alignments can be called
during overhead time when the device-under-test is exchanged.
When Auto Align, Partial, is selected the elapsed time counter begins for Auto Align
Off time.
When Auto Align, Partial is selected, the Settings Panel indicates Align: Partial in an
amber color. The amber color reminds you that you are responsible for maintaining
the warranted operation of the instrument.
Off
SCPI example :CAL:AUTO OFF
Auto Align, Off disables automatic alignment and the maintenance of warranted
operation, for the benefit of maximum measurement throughput. With Auto Align
2105 Spectrum Analyzer Mode User's &Programmer's Reference
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