It USES distilled water and alcohol to refine water soluble acid and alkali of sample and then test the extractive with PH indicator.
用蒸馏水或乙醇水溶液抽提试样中的水溶性酸或碱，然后用酸度计或指示剂对抽提物进行测定。
By taking pH meter made of MCU as an example this article introduces the general principle system structure and software making process of intelligent meters.
以用单片机制作智能酸度计为例，介绍了基于单片机的智能仪表的一般原理、系统结构及其软件编制流程。
This article presents the Characteristics and design thoughts of the Pre-amplifier of PH Meter, the application of the relevant techniques of EMC and the measures that used in the design.
介绍了PH计前置放大器的特点及其设计思想，阐述了电磁兼容相关技术的应用以及设计中所采取的措施。
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