双积分式A/D 转换器ICL7135构成的4(1/2)位数字仪表具有检测精度高、抗干扰能力强等特点,在工业过程的自动检测中,有着广泛的应用。但由于这些数字仪表的满量程显示是±19999,而实际待测的物理量又往往超过此量程范围,故使得测量仪表不能直读。如果只用它们的后四位,就会降低测量精度。笔者在工作中摸索到一种扩展其读数范围的方法,现介绍如下。 Double integral A / D converter ICL7135 composed of 4 (1/2) digital instruments with high detection accuracy, anti-interference ability and other characteristics, in the industrial process of automatic detection, has a wide range of applications. However, due to the full-scale display of these digital instruments is ± 19999, and the actual physical quantities to be measured often exceed this range, it makes the measuring instruments can not directly read. If you only use the last four of them, it will reduce the measurement accuracy. The author found a way to expand its reading range at work, are presented below.