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System Functions
System
If the Align RF subsystem succeeded in aligning (no interfering signal present), the elapsed time counter
begins for Last Align Now, RF Time, and the temperature is captured for the Last Align Now, RF
Temperature. In addition the Error Conditions “Align skipped: 50 MHz interference” and “Align
skipped: 4.8 GHz interference” are cleared, the Error Condition “Align Now, RF required” is cleared,
and bits 11 and 12 are cleared in the Status Questionable Calibration register
Align Now, All can be interrupted by pressing the Cancel (ESC) front-panel key or remotely with Device
Clear followed by the :ABORt SCPI command. When this occurs the Error Condition message “Align
Now, All required” is generated, and bit 14 is set in the Status Questionable Condition register. This is
because new alignment data may be employed for an individual subsystem, but not a cohesive set of data
for all subsystems.
In many cases, you might find it more convenient to change alignments to Normal, instead of executing
Align Now, All. When the Auto Align process transitions to Normal, the analyzer will immediately start
to update only the alignments that have expired, thus efficiently restoring the alignment process.
In models with the RF Preselector, such as the N9038A, the Align Now All alignment will immediately
execute an alignment of all subsystems in the Spectrum Analyzer and partial subsystems of the RF
Preselector. The additional alignments are the System Gain, Mechanical attenuator and Electronic
attenuator alignments on the RF Preselector path. The purpose of these alignments is to improve the RF
Preselector path amplitude variation compared to the bypass path.
Key Path: System, Alignments, Align Now
Mode: All
Remote Command: :CALibration[:ALL]
:CALibration[:ALL]?
Example: :CAL
Notes: :CALibration[:ALL]? returns 0 if successful
:CALibration[:ALL]? returns 1 if failed
:CALibration[:ALL]? is the same as *CAL?
While Align Now, All is performing the alignment, bit 0 in the Status
Operation register is set. Completion, or termination, will clear bit 0 in the
Status Operation register.
This command is sequential; it must complete before further SCPI commands
are processed. Interrupting the alignment from remote is accomplished by
invoking Device Clear followed by the :ABORt command.
Successful completion will clear bit 14 in the Status Questionable Calibration
register.
An interfering user signal is not grounds for failure of Align Now, All.
However, bits 11 and 12 are set in the Status Questionable Calibration register
to indicate Align Now, RF is required.
An interfering user supplied signal will result in the instrument requiring an
Align Now, RF with the interfering signal removed.