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目前,集成A/9转换器应用日益广泛,如3~1/2位A/D转换器ICL 7106/7107 4~1/2位A/D转换器ICL7135等都已被许多厂家应用于工业自动化仪表中。从开发仪表的实践中,笔者感到在许多场合,要求A/D转换器的码数要尽量多,以适应整台仪表的测量高精度。如20吨电脑汽车秤,秤体皮重达10吨以上,为了提高精度采用数字方法抵消皮重。这样对总重30吨(最大称量20吨加上秤体10吨)的重量信号,若用2万码的A/D转换器,最多可转换成2万码,其中对应称重范围的有效信号小于2万码,只有13000码左右了,这限制了电子秤精度的提高。
At present, the integrated A / 9 converter is widely used, such as 3 to 1/2 bit A / D converter ICL 7106/7107 4 to 1/2 bit A / D converter ICL7135 and so on, have been used by many manufacturers in industrial automation Instrument. From the development of instrumentation practice, I feel in many occasions, requiring A / D converter code to be as much as possible to adapt to the entire instrument measuring high accuracy. Such as 20 tons of computer car scales, scale body weight of 10 tons or more, in order to improve the accuracy of digital methods to offset the tare weight. This weight of 30 tons (the maximum weighing 20 tons plus scale body 10 tons) weight signal, if 20,000 A code with A / D converter can convert up to 20,000 yards, which corresponds to the effective weighing range Signal is less than 20,000 yards, only about 13,000 yards, which limits the accuracy of electronic scales to improve.