User`s guide

Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide 205

Basic Digital Operation (Option 651/652/654)

I/Q Calibration

Use the I/Q calibration for I and Q signal corrections. What aspects of the I and Q signal is corrected

depends on whether the signal is internally or externally generated.

When you perform an I/Q calibration, that calibration data takes precedence over the

factory–supplied calibration data. The calibration routines improve performance that may degrade

over time or due to temperature changes. An I/Q calibration should be run when the ambient

temperature has varied by at least ±5 degrees Celsius from the ambient temperature at which the

previous calibration was run.

CAUTION For firmware revisions ≥A.01.50, the behavior for the I/Q calibration is:

• The user I/Q calibration is persistent (i.e. Pressing instrument preset or cycling

power does not remove the user I/Q calibration from memory).

• If the start and stop frequencies are set to the same value, then the calibration will

be performed exactly at that frequency and the data will be persisted in the

bounding calibration array elements.

For firmware revisions

≤A.01.50:

• The user I/Q calibration is not persistent (i.e. Pressing instrument preset or cycling

power removes the user I/Q calibration from memory).

• If the start and stop frequencies are set to the same value, the calibration is

performed at the bounding calibration array elements and persisted in the bounding

calibration array elements.

Correction Internal I and Q External I and Q

Offset XX

Gain Balance X--

Quadrature Error XX