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sagedus, mis näitab vahelduvvooluvõrgu polaarsuse muutumise sagedust, grid frequency indicates the frequency of the change in the polarity in the AC network
network frequency . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/network%20frequency/1/eng (03.07.2026)
