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I started investigating this problem after I observed small vibrations (jerking)
in the servo arm when load was applied. So started to analyze with my oscilloscope (an SDS 200A digital) what
was happening. The result of these measuring can be seen bellow. The are multiple causes for this noise,
anywhere from your power supply, bad wiring to your controller (as it was in my case).
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Servo control signal measured in two different positions.
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Servo control signal noise with and without load applied.
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Servo power line noise measured first with no load then with increased load.
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