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以上海天时仪器厂生产的ｐＨ－７１１型酸度计为例，由于采用了温度传感器直接测量液温并在屏幕上显示出来，使我们不能按传统的方法在指定温度下检定仪器示值误差，为此我们采用下列方法进行检定，实践证明是可行的，且可满足检定规程的要求。将电位差计与电计正确联接，温度
Taking the pH-711 pH meter produced by Shanghai Tianshi Instrument Factory as an example, we can not test the instrument’s indication error at the specified temperature by using the temperature sensor to directly display the liquid temperature and display it on the screen. We use the following methods for verification, the practice proved to be feasible, and can meet the requirements of test procedures. Potentiometer and electric meter correctly connected, the temperature