Agilent Technologies 86038A User Manual page 56

Measurement Concepts Description of the 86038A
selectable calibration routine that runs as part of the normalization
process. The routine sets the modulation frequency and the wavelength,
then steps the TLS optical output level (using attenuation) in increments
from low to full output. At each step, the RF phase is measured and
associated with the RF input level. This data is used to correct future
measurements. It is recommended that the PDA correction be performed
at the same modulation frequency as the measurements it will be applied
to.
Length Normalization
If a Length measurement is specified with the Measure mode, the
Normalization path's length is measured so that it can be subtracted out.
DUT Length = Total Length – Normalized Path Length.
Refer to "Length" on page 98 to setup a length measurement.
Wavelength Accuracy Correction
Using the optional 86122A multi-wavelength meter, wavelength correction
is performed for stepped normalizations. That is, when Setup > CD/PMD >
is set to one of the two stepped measurement modes. Wavelength
correction is always performed if an 86122A is connected. Five wavelength
points are measured and the average offset is applied.
For more information, refer to "Normalization Range" on page 100 and to
"Begin Normalization" on page 107.
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Agilent 86038A Optical Dispersion Analyzer, Third Edition