CCEM-K2 key comparison of 10-MΩ and 1-GΩ resistance standards

An international comparison of DC resistance at 10 MΩ and 1 GΩ was organized under the auspices of the Consultative Committee for Electricity and Magnetism (CCEM) and piloted by the National Institute of Standards and Technology (NIST) with 14 other National Metrology Institutes (NMIs) participating. The transport standards were measured by the participating NMIs during a three-and-a-half year period beginning August 1996 and concluding March 2000. The transport standards used for this comparison were a set of three wirewound 10-MΩ standard resistors and three film-type 1-GΩ standard resistors, all packaged at NIST for this key comparison. The comparison demonstrated that all participating NMIs agree with the key comparison reference value at 10 MΩ and 1 GΩ within the 95% confidence level.