6 System Functions
System
the Characterize Noise Floor operation be performed when the analyzer is operating at an ambient
temperature that is significantly different than the ambient temperature at which this alignment was last
run. In addition, Agilent recommends that the Characterize Noise Floor operation be performed after the
first 500 hours of operation, and once every calendar year.
The noise floor model from the last operation of Characterize Noise Floor survives across the power cycle.
The Characterize Noise Floor function can be interrupted by pressing the Cancel (ESC) front-panel key or
remotely with Device Clear followed by the :ABORt SCPI command. None of the new characterization data
is then used. However, since the old characterization data is purged at the beginning of the
characterization, you now have an uncharacterized noise floor. You should re-execute this function and
allow it to finish before making any further measurements with NFE. Until you do, the analyzer will display
a “Characterize Noise Floor required” message and set bit 12 in the Status Questionable Calibration
register (STATus:QUEStionable:CALibration:EXTended:NEEDed).
Key Path
System, Alignments, Advanced
Mode All
Remote Command
:CALibration:NFLoor
:CALibration:NFLoor?
Example :CAL:NFL
Notes :CALibration:NFLoor? returns 0 if successful
:CALibration:NFLoor? returns 1 if failed (including interfering user signal)
While Characterize Noise Floor is performing the alignment, bit ? in the Status Operation register is
set. Completion, or termination, will clear bit ? 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.
A failure encountered during characterization will generate the Error Condition message
“Characterize Noise Floor failed” message and set bit ? in the Status Questionable Calibration
register. Successful completion will clear bit ? in the Status Questionable Calibration register.
Dependencies This key does not appear in models that do not contain NFE. In these models the SCPI command is
accepted without error but no action is taken.
Couplings Successful completion of Characterize Noise Floor will begin the elapsed time counter or the Last
Characterize Noise Floor Time.
Initial S/W Revision A.14.00
Key Path
Visual annotation in the Show Alignment Statistics screen
Mode All
Remote Command
:CALibration:TIME:NFLoor?
Example :CAL:TIME:NFL?
Notes Value is the date and time the last successful Characterize Noise Floor was executed. The date is
separated from the time by a space character. Returns “” if no Characterize Noise Floor has ever been
performed on the instrument.
320 EMI Receiver Mode Reference
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