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Originally Posted by tStano
How would you use the voltmeter to tell whats wrong with the encoder? Just to see that it is indeed getting power and common?
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That's a start.
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The pulses on the output channels will probably be much too fast to be read without an oscilliscope, unless the encoder has really low resolution
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Or unless you rotate it by hand, very very slowly... in which case you should see the signal waveform (especially with an analog voltmeter).