померить обороты двигателя?
обычно применяют оптический тахометр , ставят винт на мотор и подносят к нему
а это что такое “оптический тахометр”?
как работают тахометры для электродвигателей??
так же как для двс.
Отлично! так же - это как?
большое спасибо. то что искал
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