4 System
4.6 Alignments
This operation might be chosen instead of All if you do not want the device under
test to experience a large change in input impedance, such as a temporary open
circuit at the instrument input.
The query form of the remote commands (:CALibration:NRF?) invokes the
alignment and returns a success or failure value.
Successful completion of Align Now All but RF clears the “Align Now All required”
Error Condition, and clears Bit 14 in the Status Questionable Calibration register. If
“Align Now All required” was in effect prior to executing All but RF, the Error
Condition message “Align Now RF required” is generated and Bit 12 in the Status
Questionable Calibration register is set. It will also begin the elapsed time counter
for Last Align Now All Time, and capture the Last Align Now All Temperature.
Align Now All but RF 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 used for an individual subsystem, but not a full new set of
data for all subsystems.
Remote
Command
:CALibration:NRF
:CALibration:NRF?
Example
:CAL:NRF
Notes Returns 0 if successful, or 1 if failed
While Align Now All but RF 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 clears Bit 14 in the Status Questionable Calibration register and sets Bit 12 if
invoked with “Align Now All required”
Couplings Initializes the time for the Last Align Now All Time
Records the temperature for the Last Align Now All Temperature
Status Bits/OPC
dependencies
Bits 12 or 14 may be set in the Status Questionable Calibration register
Overlapped Command
Remote
Command
:CALibration:NRF:NPENding
Example
:CAL:NRF:NPEN
Notes :CALibration:NRF:NPENding is the same as :CALibration:NRF, including all conditions,
status register bits, except that this SCPI command does not block the SCPI session, so you should use
status register bits to query whether the calibration is successfully completed or not
Typical usage is:
1811 Short Range Comms & IoT Mode User's &Programmer's Reference
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