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Show me how to diagnose a rotary encoder using a multimeter and a scope

Scenario:

A conveyer is operating erratically: as the conveyer speeds up, the systematic process timing seems to get out of control.

You cannot decide if the problem is with the positioning encoder or the controller.

The encoder output measurement on your DMM appears to be normal.

You have spent several hours trying to debug the controller program, but nothing seems to solve the problem.

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