Abstract:According to the verification requirements in JJG 539 - 2016 《Digital Indicating Weighing Instruments》, a set of automatic detection device for identification threshold of electronic hanging scales is designed. The device aims at solving the problems of various types of electronic hanging scales, difficulty in loading weights and the like,the device realizes automatic detection of identification threshold of electronic hanging scales by combining PLC automatic control technology, image data acquisition technology with a self-made identification threshold weight string and a carrier platform, and can provide references for automatic detection of identification threshold of other digital indicating weighing and automatic measurement of error before rounding.