HP 8753E User Manual page 352

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Figure 6-47. Full Two-Port Emor Model Equations
In addition to the errors removed by accuracy enhancement, other systematic errors exist
due to limitations of dynamic accuracy, test set
These, combined with random errors, also contribute to total system measurement uncertainty.
Therefore, after accuracy enhancement procedures are performed, residual measurement
uncertainties remain.
repeatability, and test cable stability.
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Application and Operation Concepts