I. Overview The SG-821 vehicle drive recorder verification device is an intelligent test instrument developed by Shandong SEG Test Instrument Co., Ltd. with non-contact speed sensor as the speed measurement unit. The system uses 32-bit microprocessor with real-time multitasking. The operating system is used for simulation test and real vehicle test of various automobile drive recorders. The instrument complies with GB/T 19056-2012 "Car Travel Recorder" and JJG (Lu) 57-2007 "Car Travel Recorder" verification procedure. It meets the test requirements of GB/T21861-2014 and is an ideal testing equipment for metrology technical departments and public security traffic inspection agencies. The system adopts large-screen liquid crystal display, Chinese character prompts, real-time display of driving speed, distance, time and other test data, clear and intuitive. The system also comes standard with RS232 interface and SD memory card interface. The test data (speed, distance, time, etc.) is stored in the file on the SD card. The user can conveniently analyze the data twice using the system machine or laptop. The system has a minimum speed resolution of 0.01 km/h. Second, the main test items l Vehicle speed test: test distance, test time, average speed, minimum speed, maximum speed. Eight test modes are available: two start conditions, four end conditions for flexible combination of multiple test modes. l Road test: continuously record the parameters such as speed, driving distance and time during the driving process of the vehicle, and it is used for real-time road test of speed error and mileage error of the vehicle driving recorder. l Simulation test: output a variety of analog speed signals, and simulate the speed error of the car tachograph. l Positioning test: latitude and longitude positioning test and time calibration of the vehicle driving recorder. Third, technical performance indicators l Power: built-in: DC9.6v; external: DC12V / 5A l Dimensions: 210 X 150 X 60 mm (SG-821) l Weight: 2.0 kg (SG-821 includes built-in battery) l Operating temperature: -20 ° C ~ 45 ° Cl RS232 interface: baud rate 9600, 8 data bits, 1 stop position, no check l
