Specifications

frequency ranges will have a lower point density
than may be desired. The resulting interpolation er
-
ror is typically very small but if an issue, you can
perform a characterization over a smaller frequency
range (or ranges) with a desired point count.
Remember that the AutoCal is a transfer standard
and the resulting calibration will only be as good as
the original characterization. Depending on connec
-
tor types, use PEIs or non-zero length thrus (consult
Three and Four Port S-parameters). Consider using
sliding loads (in the 365X series of calibration kits)
or the higher performance fixed loads of the 375XR
calibration kits.
The characterization process is performed by mea
-
suring the various standards in the module sequen
-
tially and is accessed under:
Utility/AutoCal Characterization
The AutoCal module must be connected as indi-
cated by the port assignment. When completed, the
characterization file can be saved to hard disk or
floppy disk. The file name must be of the form
Sxxxxxx.ACD where the .ACD extension will auto-
matically be added.
4-PORT AUTOCAL AUTOCAL
9-12 MS462XX OM