How to judge the quality of an encoder

The easiest way for the encoder to judge whether it is damaged is to connect it according to the correct wiring. If AB does not have a pulse output, it proves to be broken. As for the quality of the function, it is mainly to see how much resolution, which is the number of internal dark scribed lines. The higher the rate, the better, but the price is relatively expensive, and the quality is good or bad. It is recommended not to buy too cheap cottage goods. Now there are more Japanese goods used in the Chinese market, and some Koreans are also good. Manufacturers of well-known PLCs, inverters or servo motors have encoder products. As for the selection of brands, you can use the samples and manuals on their official website. Of course, you can also directly contact the agents.


1 Connect to PLC to check whether the number of pulses or code value is correct;


2 Connect the oscilloscope to view the waveform;


3 Use the multimeter voltage file to test if the output is normal.


When the encoder is NPN output: Measure the positive pole of the power supply and the signal output line. When the transistor is turned ON, the output voltage is close to the supply voltage. When the transistor is turned OFF, the output voltage is close to 0V.


When the encoder is PNP output: Measure the negative pole of the power supply and the signal output line. When the transistor is turned ON, the output voltage is close to the supply voltage. When the transistor is turned OFF, the output voltage is close to 0V.


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