1. When the encoder is stationary, the voltage of phases A and B can be measured to be around 15V or 0V. When gently rotating the encoder, the above two voltages should be obtained in turn. A -, B - can obtain 0V or -15V voltage accordingly. 2. When the encoder rotates continuously, the output obtained is the average of the effective voltage values, which may only have a stable voltage value of around 3-5 V. 3. The multimeter can only be used for rough inspection. If the measurement results differ significantly from the above description, it is preliminarily determined that the encoder has a malfunction. 4. However, using a multimeter alone cannot accurately check whether the encoder is fully functioning. Under normal circumstances, the encoder outputs high-frequency pulse signals, and it is recommended to use an oscilloscope for measurement. 5. Connect the output A or B phase signals of the encoder to the oscilloscope, rotate the encoder shaft, and if a high-frequency 15V square wave pulse signal is observed on the oscilloscope, it indicates that the encoder is not faulty
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