Present International Status of Microwave Power Standards

This paper presents an upto date informatlon on various techniques being used for the precise measurement of microwave power in National Standards Laboratories of various countries includinq the capabilities attained by NPL, India in this field. Various aspects, such as design and fabrication, operational simplicity, limitations, etc., of the techniques have been discussed. The uncertainty achieved in the determination of effective efficiency of the mounts by different techniques has also been given.