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an Oscilloscope is connected to monitor the tachometer of a DC servo if the tachometer output...

an Oscilloscope is connected to monitor the tachometer of a DC servo if the tachometer output oscillate as the motor comes to a stop it's a sign that the

Engineering   Electrical-Engineering   
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Answer #1

It means that speed of the DC servo motor is changing

We know a tachometer is used to measure rotational speed of a machine. This tachometer produces an electric signal voltage which is proportional to the speed of the machine. When this tachometer is connected to an oscilloscope , oscilloscope displays the voltage signal amplitude varying with time.

When the motor is running at constant speed voltage signal displayed on oscilloscope is also constant in magnitude. But if the motor speed changes with time oscilloscope displays oscillating signal.

So here as the motor speed is changing oscilloscope displays oscillating signal

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