CCEM-K9 comparison of AC–DC high voltage standards

Abstract

Almost all participants use an automatic or semi-automatic system to compare the travelling standards against their reference standards. In general the AC-DC measurement consists of an input sequence DC+, AC, DC-, AC, etc… Each time, either the output voltages of both thermal converters are directly measured (dual-channel method), or one of them only and the difference between them ("differential" method).