Keysight E6640A, Measurement Applications User & Programmer Reference

Page: 287 / 2870

6 System Functions
System
period between power-up of the TRX and invoking the “All” alignment. The instrument stops any
measurement currently underway, performs the alignment, then restarts the measurement from the
beginning (similar to pressing the Restart key).
If an interfering user signal is present at the RF Input, the alignment is performed on all subsystems except
the RF. After completion, the Error Condition message “Align skipped: 50 MHz interference” or “Align
skipped: 4.8 GHz interference” is generated. In addition the Error Condition message “Align Now, RF
required” is generated, and bits 11 and 12 are set in the Status Questionable Calibration register.
The query form of the remote commands (:CALibration[:ALL]? or *CAL?) invokes the alignment of all
subsystems and returns a success or failure value. An interfering user signal is not grounds for failure; if the
alignment was able to succeed on all portions but unable to align the RF because of an interfering signal,
the resultant will be the success value.
Successful completion of Align Now, All will clear the “Align Now, All required” Error Condition, and clear
bit 14 in the Status Questionable Calibration register. It will also begin the elapsed time counter for Last
Align Now, All Time, and capture the Last Align Now, All Temperature.
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 EXM, Source ARB play will be turned off and the source states will not be restored after Align Now, All.
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.
W-CDMA & HSPA Measurement Applications Reference 287