A Comparison of Measurement Uncertainty in Vector Network Analyzers and Time Domain Reflectometers

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The objective was to observe measurement uncertainty under more closely controlled conditions. Towards that end, during TDR testing the 3.5mm precision open was left in place during all 22 connect / disconnect measurements; the sample assembly connection was cycled at the TDR sampling head only. Likewise during VNA testing, the sample assembly connection was cycled at port one only. This strategy, although not representative of production testing, introduced a disturbance into the test system such that the outcome could be observed.