7- 52
Operating Concepts
Measurement Calibration
Figure 7-39 Full Two-Port Error Model Equations
How Effective Is Accuracy Enhancement?
In addition to the errors removed by accuracy enhancement, other systematic errors exist due to limitations
of dynamic accuracy, test set switch repeatability, and test cable stability. These, combined with random
errors, also contribute to total system measurement uncertainty. Therefore, after accuracy enhancement
procedures are performed, residual measurement uncertainties remain.
The uncorrected performance of the analyzer is sufficient for many measurements. However, the next three
illustrations show the improvements that can be made in measurement accuracy by using a more complete
calibration routine. See
Figure 7-40, Figure 7-41, and Figure 7-42.
Figure 7-40a shows a measurement in log magnitude format with a response calibration only. Figure 7-40b
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