Intercomparison of NIST, NPL, PTB, and VSL thermal voltage converters from 100 kHz to 1 MHz

J.R. Kinard, R.B.D. Knight, P. Martin, M. Klonz, J.P.M. de Vreede, J. Dessens
1993 IEEE Transactions on Instrumentation and Measurement  
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 that
more » ... ve values of ac-dc difference in the 100 kHz to 1 MHz frequency range have been established with 20"uncertainties of 4-8 ppm.
doi:10.1109/19.278639 fatcat:wwrz7pmhcjge5jd3ojogcjdite