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source having a constant but not necessarily known output, against which a standard lamp and a source under test are successively compared, konstantse, kuid mitte tingimata teadaoleva väljundiga valgusallikas, mille suhtes võrreldakse järjestikku etalonlampi ja võrreldavat valgusallikat
comparison lamp . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/comparison%20lamp/1/eng (19.06.2026)
