WEBVTT

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Jérôme measures 7,000 rpm on an asynchronous motor (laser measurement)!

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Be careful, even with the right camera, just aim: the reflective tape (1 per turn only)

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50 Hz, 4 poles (2 pairs) and therefore 1500 rpm (50 Hz * 60 s) - sliding (asynchronous) = 1487

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1% slip unladen = correct!

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We will use our LED strobe light!

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We use this in the evening to see the rhythm of the dancers :-)

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It is necessary to be able to immobilize the image! But watch out!

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At 1500 rpm it is seen 'turning upside down': we are at the top!

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We see this phenomenon in the movies with the wheels of vehicles

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Fine adjustment and miracle ...

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The same value is found as with the laser tachometer!