60 Agilent N5181A/82A MXG Signal Generators SCPI Command Reference
System Commands
Calibration Subsystem (:CALibration)
Calibration Subsystem (:CALibration)
:DCFM
Supported All
:CALibration:DCFM
This command initiates a DCFM or DCΦM calibration depending on the currently active modulation.
This calibration eliminates any dc or modulation offset of the carrier signal.
NOTE If the calibration is performed with a dc signal applied, any deviation provided by the dc
signal will be removed and the new zero reference point will be at the applied dc level. The
calibration will have to be performed again when the dc signal is disconnected to reset the
carrier signal to the correct zero reference.
Key Entry DCFM/DCFM Cal
Remarks Use this calibration for externally applied signals. While the calibration can also
be performed for internally generated signals, dc offset is not a normal
characteristic for them.
:IQ:DC
Supported N5182A
:CALibration:IQ:DC
This command performs a one to two second adjustment that is not traceable to a standard. However,
it will minimize errors associated with IQ gain, quadrature, and offset voltages. This adjustment
minimizes errors for the current signal generator setting and at a single frequency. The DC
adjustment is volatile and must be repeated with each signal generator setting change. This command
can be sent while the RF On/Off is set to Off and the adjustment will still be valid when the RF is
enabled. IQ must be on to perform this adjustment.
The I/Q DC adjustment is dependent upon a number of instrument settings. If any of the instrument
settings change, the adjustment will become invalid. The dependent instrument settings are:
•RF frequency
• I/Q attenuation level
• Baseband generator settings
• I/Q polarity settings
• Baseband filter settings
• Path settings (Internal I/Q Mux Path 1 or Path 2)
• I/Q calibration (the I/Q DC calibration will be invalidated if any other I/Q calibration is executed
or if the Revert to Factory Default key is pressed)
• Temperature (±5 degrees)
The following instrument states will not invalidate the I/Q DC calibration:
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