Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

CCEM-K2 Key Comparison of 10 Mohm and 1 Gohm Resistance Standards



Dean G. Jarrett, Ronald F. Dziuba


An international comparison of dc resistance at 10 Mohm and 1 Gohm 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 Mohm standard resistors and three film-type 1 Gohm standards resistors, all packaged at NIST for this key comparison. The comparison has demonstrated that all participating NMIs agree with the key comparison reference value (KCRV) at 10 Mohm and 1 Gohm within the 95% confidence level, and most NMIs agree within the 99% confidence level.
IEEE Transactions on Instrumentation and Measurement


bridge, measurement, national metrology institute, pilot laboratory, reference value, standard resistor, transport standard, uncertainty, key comparison


Jarrett, D. and Dziuba, R. (2003), CCEM-K2 Key Comparison of 10 Mohm and 1 Gohm Resistance Standards, IEEE Transactions on Instrumentation and Measurement, [online], (Accessed March 2, 2024)
Created April 1, 2003, Updated January 27, 2020