Q: How to use simple multimeter to determine whether the rotary encoder is good or bad?

The existing 24VHTL incremental rotary encoder, connected to its 24V, 0V, A, A-, B, B- six lines to CU310 X23 port, the power does not work, the multimeter measured the power supply terminal voltage of 2:00 V, Remove and then found the output voltage CU310 is 24V. Doubts encoder fault, the encoder 4 only then 24V, measured on the voltage of 0 A = 0V, A- = 24V, B = 24V, B- = 0V, is the encoder normal? Encoder manufacturers say normal should be about 15V? Several of the same encoders are like this.
A: The first look at how many volts encoder supply, the signal is how many volts. Measured with a multimeter, as stated, measured as A + 0, A – 0, B + 0, B – 0, the measured value and the encoder parameter value comparison. However, the maximum voltage measured with a multimeter, it is possible that the voltage you measured or virtual voltage, the best is to use an oscilloscope to measure. Sometimes you measure the encoder voltage is normal, but it can not be used, frequently reported failure. General encoder reported faults are set speed and actual speed deviation is too large, so you can first check the encoder shield connection and so on, to prevent electromagnetic interference, while the deviation parameter values ​​can be adjusted up to see the situation.

Multimeter can not accurately check whether the encoder is completely normal, multimeter can easily detect incremental encoder is good or bad:
Turn on the incremental encoder and measure the output voltage of A / B / Z. If neither is present, the power supply is partially damaged or the main chip is damaged. If a phase is present, slowly turn the encoder shaft. A / B should be the alternate voltage High to low voltage, 1/2 chance, and Z is a circle once a high level, high voltage is generally low 2V or higher input voltage, such as a phase does not always appear high, Or the level of the output is low, the phase is broken.

If this method of detection is good, then look at the oscilloscope, a look at the waveform has been distorted, and see if there is a pulse missing, and then testing.