The portable Quality Assurance of Spectral UV Measurements in Europe (QASUME) irradiance scale has been directly compared to the primary irradiance standard (blackbody BB3200pg) of the Physikalisch-Technische Bundesanstalt (PTB) using the travelling spectroradiometer QASUME. The average blackbody spectral irradiance scale based on three different temperatures (2940 K, 2997 K and 3059 K) was on average 0.7% greater than the QASUME irradiance scale based on the average of three low-power lamps.
This is fully consistent with the expanded uncertainty (k = 2) of 4% in the ultraviolet (UV) wavelength range and 2.6% above 400 nm of the QASUME irradiance scale. If these blackbody measurements are used to establish directly the portable QASUME irradiance scale, then its expanded uncertainty (k = 2) is substantially reduced to 2.5% in the UV and 2.0% above 400 nm.
Sperfeld, P., 2005. Direct traceability of the portable QASUME irradiance scale to the primary irradiance standard of the PTB. Metrologia, 42(2), p.134.
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