user manual

Chapter 3 31
Test Set Cal and SelfCal
Introduction
SelfCal
A SelfCal is an automated internal system calibration that should be performed on a
regular, frequent basis. If the operating temperature of the analyzer and test set is
within the specified range (refer to Chapter 8), the recommended time interval is
about once an hour. A SelfCal does not require removal of the DUT or external
connections of calibration standards. The SelfCal uses the results of the most recent
Test Set Cal along with measurements of internal, electronically switched open,
short, load, and through transfer standards to remove the drift of the network
analyzer and multiport test set due to environmental variations.
See “Test Set Cal and SelfCal: Theory of Operation” for detailed information on
how the Test Set Cal and SelfCal work together.
NOTE Agilent recommends that you use the Test Set Cal and SelfCal features whenever
you are using your multiport system. If you prefer, you can select from traditional
analyzer calibrations, although in doing so the Test Set Cal and SelfCal features will
not be available. Refer to your analyzer’s User’s Guide for information on these
traditional calibrations.