Multijunction thermal converters as the NBS primary AC-DC transfer standards for AC current and voltage measurements

A set of multijunction thermal converters (MJTC´s) has been established as the NBS primary ac-dc transfer standard for ac current and voltage measurements. This choice is based upon the advantages of the MJTC´s, the development of an improved EMF comparator, an extensive series of intercomparisons, and numerous supporting investigations.