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frequency, in undulations per revolution, of a sinusoidal closed profile of which 50 % of the amplitude is transmitted by the profile filter, suletud siinusprofiili sagedus lainepikkustes pöörde kohta, mille amplituudist 50 % edastab profiilifilter
fc . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif/est,mul/mea/fc%20/1/est (01.09.2026)
