介绍了过程分析仪器零点与量程自动校正的两种方法。一种采用硬件电路,以D/A转换器为核心器件,利用数字电路的记忆功能,构成相对永久性采样保持电路,保持零点补偿电压和量程增益的稳定。另一种是软件方法,在采用微机的分折仪器中,充分利用微机的运算与存贮能力,达到校正的目的,文中给出了校正公式,论证了方法的原理。 Two methods of automatic zero and span calibration of process analyzer are introduced. A hardware circuit to D / A converter as the core device, the use of digital memory function of the circuit to form a relatively permanent sample and hold circuit to maintain zero-offset voltage and range gain stability. The other is the software method, the use of microcomputer in the folding instrument, make full use of computer computing and storage capabilities, to achieve the purpose of correction, the paper gives the correction formula, demonstrated the principle of the method.