Helitugevuse mõõtur on passiivne elektromehaaniline mõõtevahend, koosneb nimelt 200 μA DC d'Arsonval voolumõõturist toidetuna täislaine vaskoksiidi alaldist, mis on paigaldatud mõõturi korpusesse.
Volume unit meter is a passive electromechanical device, namely a 200 µA DC d'Arsonval movement ammeter fed from a full-wave copper-oxide rectifier mounted within the meter case.
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