Two generations of solar spectral irradiance meters (SolarSIMs), D1 and D2, are evaluated against reference instrumentation at the University of Ottawa SUNLAB outdoor test facility since their commissioning on September, 2014 and October, 2015, respectively. The average spectral direct normal irradiance (DNI) of the instruments was found to be well within ±1% at the six measured bands, centred at 420, 500, 610, 780, 880, and 940 nm, and mainly within ±2% for the remaining wavelengths in the 280-4000 nm range as compared to the reference SolarSIMs. The difference in cumulative energy densities as measured by the SolarSIMs and an Eppley model NIP pyrheliometer was found to be less than 0.5%. No degradation was observed during 19 months of operation.

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