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30 Chapter 3
Test Set Cal and SelfCal
Introduction
Introduction
This chapter presents information on the following topics:
• Test Set Cal: An Overview
• Test Set Cal and SelfCal: Theory of Operation
Measurement calibration is a process that improves measurement accuracy by using
error correction arrays to remove systematic measurement errors. By implementing
the Test Set Cal and SelfCal features on your multiport system, you can increase the
accuracy of your measurements and increase the throughput of your multiport
measurements by eliminating frequent and lengthy calibration procedures.
Test Set Cal
A Test Set Cal is a calibration that should be performed when you first set up your
test system and thereafter on a regular, but relatively infrequent basis. The time
interval between Test Set Cals is dependent mainly on temperature. If the operating
temperature of the analyzer and test set is within the specified range, the
recommended time interval is about once a month. A Test Set Cal requires you to
connect calibration standards to all of the ports to be used.
See “Test Set Cal: An Overview” to learn how to perform a Test Set Cal.
Cal Type What is it? When to do it?
Test Set
Cal
A full calibration of the
multiport test system.
Requires connections of
external calibration
standards.
When you first set
up your test
system. Thereafter,
about once a month
if within the
specified
temperature range.
SelfCal An internally automated
calibration technique.
Uses solid-state switches
to measure calibration
standards located inside
the test set.
Set SelfCal to
execute
automatically as
often as needed
(typically once an
hour).