Adjustable encoder zero resistance bad what reason be?

Adjustable encoder is a kind of precision electronic components, it may cause some adverse conditions, such as zero resistance bad, so, how to determine the adjustable encoder zero resistance bad? Adjustable encoder zero resistance bad what reason be? This simple little problem we simply talk about with you. How to determine the adjustable encoder zero resistance bad? 1, the multimeter to confirm zero resistance; 2, disassemble the product, check whether there is any scratch on surface of carbon, brush with and without deformation, with and without carbon plate cracking and terminal loose phenomenon, observe whether the brush track at the start and end stays on the silver layer; 3, 2 end terminal detection to the silver layer resistance is less than 3 Ω between inner ring apogee. Adjustable encoder zero resistance bad what reason be? 1, carbon plate itself silver layer sheet resistance is too large; 2, the following three conditions are likely to lead to zero resistance bad: ( 1. Loose terminal or terminal and carbon poor contact; 2. Carbon plate cracking; 3. Carbon membrane layer to be brush to scrape or shave off. ) 3, in the beginning or the end brush failed to stay on the silver layer; 4, poor contact deformation or brush and carbon brush. Shanghai electronic products co. , LTD. , is 27 years old coder manufacturer, specializing in the production of various types of adjustable encoder, the company has a strict quality control process, production batch qualified rate & ge; 99. 3%, look for cost-effective, quality adjustable encoder manufacturer is looking for electronic.