WYD-B portable brake performance tester an overview of WYD-B portable braking performance tester is mainly used to detect the vehicle braking performance. The instrument uses Freescale's embedded ARM processor and high sensitivity of the acceleration sensor, the instrument has high accuracy, stability, braking performance test for the road test provides a convenient and accurate means of detection. The instrument uses 128x64 large-screen LCD display, full graphical menu-driven operation; can clear visual display of test data, the curve; instrument built-in large capacity memory can record data. System is equipped with a standard RS232 interface, can be connected with a portable external printer, print the test results can also be configured zigbee wireless module, 433MHz wireless module, GPRS wireless module will send test results to a computer. Machine with portable design, compact, equipped with powerful magnets on the external sensor, easy to install, but also for testing on small space vehicles. The instrument is ideal for teaching equipment vehicle manufacturers, vehicle inspection, vehicle maintenance, research departments, road transport sector and agricultural safety supervision departments of the ideal testing equipment and automotive aspects of universities. 2 Technical parameters Measuring range: 0 ~ ± 19.6m / s accuracy of the instrument:??? 2.0; the instrument resolution: Acceleration: 0.01m / s; speed: 0.1km / h; time: 0.01s; distance: 0.1m; products meet the following standards: GB 7258 -2012 "the safe operation of motor vehicles technical conditions" GB21861-2008 "safety inspection items and methods of motor vehicles" GA 36-2007 "People's Republic of China motor vehicle license plate" JJF 1168-2007 "Portable brake performance tester calibration standard" "tractors and combines safety inspection items and methods" 3 Performance Specifications Dimensions:? 205 x 65 x 30 mm Power:? Use 节 5 1.2V 1800mAH NiMH rechargeable batteries, After a full can work continuously for more than 10 hours, the battery level display stalls Weight: 1 kg Communications: Standard RS232 interface, USB interface (optional), you can achieve PC communication; Zigbee wireless module, wireless data transmission (the election?? distribution). ? Calculation and display the average deceleration (MFDD) fully developed, coordinated braking time, speed and braking distance braking early? Optional thermal printer or dot matrix printer, you can print out the field test reports, including the report date , time, license plate number, vehicle loading and conclusions, zigbee wireless LAN can also be used for wireless data transmission, write to SQL Server database (optional), PC software queries realize A4 paper. ? Light perception backlight automatically open with the outside light, 128x64 large-screen LCD display, full Chinese menu operation graphical software correction by car "nod" effect caused by the impact;? Easy to install, easy to operate, can be done alone by the inspector Detection? with all parameters large capacity memory can store up to 80 sets of data, the data is not lost after shutdown? automatically save the last test set