I. Introduction: switch enables the entire vehicle dynamometer, measuring twist, angle, displacement, pressure drop performance test bed, were kind of car can use the rotary switch (ignition switch, air conditioner panel switch, combination switch, etc.) torque detection, displacement detection, pressure detection pull, rotation angle detection, contact voltage drop detecting, using a dedicated sensor calibration jig and calibration procedures, to ensure test accuracy device, and draw a graph and corresponding performance graph handle, in order to achieve the switch detection of mechanical performance parameters, determine the quality of the switch is qualified and product strengths and weaknesses. Provide test samples and special fixtures fixture in the testing process. Second, to meet the standards: 1, QC / T218 "automobile steering column switch on a combination of technical conditions." 2, QC / T632 "car with a rocker switch technical conditions." 3, QC / T504 "automotive ignition switch technical conditions." 4, QC / T198 "auto switch General technical conditions." Third, the test parameters: a DC power supply: 0 ~ 30V adjustable, 0 ~ 10A adjustable. 2, measuring range: 0 ~ 200N adjustable. 3, the measured torque range: 0 ~ 10NM adjustable (0 ~ 1NM combination with 0 ~ 10NM). 4, pressure drop range: 0 ~ 5000MV adjustable. Fourth, the test subjects: automotive rocker switch, ignition switch, air conditioner panel switch, combination switch, slider switch.