This report describes a basic, but potentially accurate, transfer technique for comparing microwave power sensors. The technique is not new, but the specific applications are.This report is written to supplement the existing literature. The method transfers the effective efficiency of a standard power sensor to an unknown (uncalibrated) power sensor. The power sensors may be bolometric (thermistor mounts), thermoelectric, or diode types, and each type will have inherent limitations. The technique can be implemented with a variety of commercial coaxial and rectangular waveguide components. Measurement uncertainty is discussed in this report so that a potential user can quantify transfer uncertainties.

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A problem of long standing interest in the UHF and microwave field is that of adapter evaluation. For many purposes, the adapter property of major interest has been its efficiency. However, a more complete description in terms of scattering parameters was required for the present adapter evaluation project. The approach to the problem was to automate the manual measurement technique for adapter efficiency. In achieving this goal, it was found that the entire set of scattering parameters could be obtained with little further effort. As a further by-product, an alternative procedure for determining correction factor for automated network analyzers was obtained.

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