72型分光光度计是我国目前各厂矿使用最多的分光光度计,由于该仪器本身没有附带校正波长的装置,故每次光源移动或更换灯泡后,波长位移将导致工作曲线的变更。如不加以校正,就会使仪器本身的灵敏度降低,加大了分析结果的误差,重者甚至使某些比色分析难以进行。如按厂方说明书的方法校正,波长误差有时竟达10毫微米。而一般要求其最大允许误差为: 72 spectrophotometer is currently the most widely used spectrophotometer factory, because the instrument itself does not come with a correction wavelength of the device, so every time the light source to move or replace the bulb, the wavelength shift will lead to changes in the working curve. If not corrected, it will reduce the sensitivity of the instrument itself, increasing the error of the analysis results, even some of the more difficult to make certain colorimetric analysis. If the method according to the manufacturer’s instructions, the wavelength error sometimes up to 10 nm. The general requirements of its maximum allowable error is: