This paper first describes the basic principle of potentiometer,and introduces the basic types of poten-tiometer.Both the straight-slip type and the rotary type.The Detroit S60 engine hand throttle is a rotary poten-tiometer,while the drive pedal and the potentiometer pressure sensor are essentially straight-slip potentiometer.In this paper,the structure of these three components and the related circuit control principles are described in detail.For the fault case of PS1 sensor of EV-56 seismic vibrator,this paper introduces the troubleshooting process and explains the fault cause.Based on the principle of potentiometer control circuit,the general diagnosis methods and steps of such circuit faults are introduced and summarized.
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