Rotary Encoder Potentiometer Testing and Good or Bad Discrimination

The main requirements for rotary encoder potentiometers are:            

(1)The resistance meets the requirements.            

(2) The contact between the sliding end of the center and the resistor body is good and the rotation is smooth. For potentiometers with switches, the switching part should act accurately, reliably and flexibly. 

Therefore, the potentiometer performance must be checked before use.           

1) Measurement of resistance value of rotary encoder potentiometer: Firstly, according to the resistance value of the potentiometer under test, select the appropriate resistance gear of the multimeter, and measure the resistance value, that is, the resistance value between AC terminals, and compare with the nominal resistance value to see whether they are consistent. At the same time, the value of the sliding contact should be fixed. If the resistance is infinite, the potentiometer is damaged.            

2) The rotary encoder potentiometer then measures the contact between the central end and the resistor, that is, the resistance value between the two ends of BC. The method is to rotate the axis slowly in the proper range of the ohmic gear of the multimeter, and observe the reading of the multimeter. Normal conditions, the reading changes smoothly in one direction. If the phenomenon of jumping, falling or impassability occurs, it shows that the active contacts have bad contact.            

3) In the rotary encoder potentiometer, the central end slips to the head or the end, and the resistance value of the central end and the coincidence end is 0 in ideal condition. In actual measurement, there will be a certain residual value (generally depending on the nominal value, generally less than 5_), which is a normal phenomenon.