叙述了液柱式压力计的精度，对U形管压力计和双管差压计的正确使用方法及误差修正做了简要分析。
The precision of liquid column manometer was described. The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed.
采用电荷耦合、提高放大倍数、降低量程等误差修正技术，提高了系统抗干扰能力和温度、压力测量数据的精度；
The robustness of system, the precise of temperature and pressure are observably improved as charge coupled, increase the amplification constant, decrease measure scope, etc.
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