Quality assurance of reference standards from nine European solar-ultraviolet monitoring laboratories
Gröbner, J., D. Rembges, A. Bais, M. Blumthaler, T. Cabot, W. Josefsson, T. Koskela, T. M. Thorseth, A. R. Webb, U. Wester
[abstract] A program for quality assurance of reference standards has been initiated among nine solar-UV monitoring laboratories. By means of a traveling lamp package that comprises several 1000-W ANSI code DXW-type quartz-halogen lamps, a 0.1-Ω shunt, and a 6-1/2 digit voltmeter, the irradiance scales used by the nine laboratories were compared with one another; a relative uncertainty of 1.2% was found. The comparison of 15 reference standards yielded differences of as much as 9%; the average difference was less than 3%.
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