Electrical apparatus for explosive gas atmospheres. Part 1. Construction and verification test of flameproof enclosures of electrical apparatus. First supplement. Appendix D. Method of test for ascertainment of maximum experimental safe gap
State system for ensuring the uniformity of measurements. State verification scheme for instruments measuring of the spectral radiance, spectral radiant power, spectral irradiance, spectral radiant intensity, power and radiant intensity in spectral range from 0,001 to 1,600 um
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