The tachometer of a building’s elevator circuit experiences interference caused by the radio system nearby. What is a common potential “fix” for the problem?

Question

Accepted Answer

Add a . 01 µF capacitor across the motor/tachometer leads.

Answer

Replace the tachometer of the elevator.

Answer

Add a 200 µF capacity across the motor/tachometer leads.

Answer

Add an isolating resistor in series with the motor leads.

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