252 Chapter 4
Instrument Functions: P - Z
System
Instrument Functions: P - Z
• On, the instrument behaves like the Alert, but will automatically perform a full alignment when
it is needed. In addition, every 15 minutes passing or 1.5 degrees temperature change will cause
just the RF system gain to be aligned, to achieve the best absolute amplitude accuracy. For
either alignment, the instrument will stop any measurement currently in process, perform the
full alignment, then restart the measurement from the beginning (similar to pressing
Restart). If
any alignment FAILs or is ABORTed by the user (eg ESCape key), the instrument will wait 5
minutes before retrying the necessary alignment. This helps to avoid infinite recursive loops of
alignment behavior in the event of broken hardware. Also see “Align All Now” on page 252.
There are 2 very quick alignments, invisible to the user, that are done every few minutes
or when certain settings are changed. These still occur, even if AutoAlign is set to Off.
These alignments are the Current SysGain and Current IF Flatness methods which can
also be forced to occur by user under the Align Subsys menu.
Key Path: System, Alignments
State Saved: Survives Preset and power cycle, but not saved in Instrument State.
Factory Preset: Not affected by
Preset.
Factory
Default: On (Restored by
System, Restore Sys Defaults.)
Remote Command:
:CALibration:AUTO OFF|ON|ALERt
:CALibration:AUTO?
Example: CAL:AUTO ON
4.9.4.2 Align All Now
Immediately executes an alignment cycle of all the subsystems (
Align RF, Align IF, Align ADC,
and
Align Current Sys Gain). The instrument will stop any measurement currently underway,
perform the full alignment, then restart the measurement from the beginning (similar to
pressing the
Restart key). All other operations are stopped and the alignments will be
visible on the display.
Key Path: System, Alignments
Remote Command:
:CALibration[:ALL] Performs a full alignment.
The following three commands perform a full alignment and return a number indicating
the success of the alignment. A zero is returned if the alignment is successful. A one is
returned if any part of the alignment fails.
:CALibration[:ALL]?
*CAL?
*TST?
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