Using the goodness-of-fit to validate the power sensor linearity specification

A microwave power sensor could measure the power levels ranging from 20 dBm to -70 dBm. The linearity is an important specification for accurate power measurements. The estimate of the linearity accuracy of power sensors is well-developed and studied. There are only limited papers and discussions on the validation of the power level linearity. In this report, we are presenting a statistical method, i.e. confidence level (e.g., 95%) and linear regression analysis, to determine the level linearity for a diode sensor. At first, the confidence level.