目前检定pH计时多采用直流电位差计。由于它配件较多,体积大,操作繁锁不便于下基层检定。本文介绍一种高精度、低价格,便于携带检定0.01级数字式pH计的专用检定仪。一、工作原理 pH计实际上是具有高输入阻抗的毫伏计,因此检定它的检定仪实际上是具有高电阻输出的毫伏发生器。本检定仪的工作原理方框图如 At present, the pH test more time using DC potentiometer. Because of its more accessories, large size, cumbersome operation is not easy under the grass-roots test. This article describes a high-precision, low-cost, easy to carry test 0.01 level digital pH meter dedicated tester. First, the working principle The pH meter is actually a millivoltmeter with a high input impedance, so the tester that verifies it is actually a millivolt generator with a high resistance output. The tester works block diagram such as