How can I reduce the effect of noise when using encoders?！

There are several ways to improve noise immunity. Be careful to separate motor and all power wires away from encoder wires. Always separate the channels from each other. All encoder wire should be shielded and carefully terminated. The pigtail that connects to the control unit using the encoder should be as short as possible. The leads will act as antennas for any stray RF in the vicinity. The addition of other noise suppression devices may be required in high noise environments.

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