Key Comparison Resistance at 100 Ohm

Project Description

The project is still in the process of preparation. Investigations on finding suitable resistors are going on. Also the EUROMET electricity contact persons will be contacted to find out who is willing to participate at what preferred time. If these preparations are finished a technical protocol will be set up.


Final Report 2010-06-30

The comparison has been completed and the the results are available in the KCDB.

A key comparison of resistance standards at 100 Ohm started in 2003. The pilot laboratory, 26 national metrological institutes, and the BIPM participated in that comparison.

The results of all laboratories show good equivalence with the comparison reference value. It can also be concluded that the results of laboratories, which directly derive their unit of resistance from the quantum Hall effect, agree within 30 ppb. This is less than one order of magnitude worse than a direct comparison of QHR-systems and limited by the transportability of the transfer standards. The results have also been linked to the corresponding CIPM comparison CCEM-K10.