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Coaxial, thermal voltage converters were handcarried among NIST, NPL, PTB, and VSL for intercomparison of ac-dc difference from 100 kHz to 1 MHz. This paper brieOy describes the highly varied methods and underlying principles on which ac-dc difference determinations are based in each laboratory, the transport standards used, and the results of the intercomparisons. The ac-dc differences reported by the participating laboratories are in very good agreement. It has been concluded thatdoi:10.1109/19.278639 fatcat:wwrz7pmhcjge5jd3ojogcjdite