721型分光光度计是一种常用的分析化验仪器,它是由光学、机械及电路等几部分组成的。长时间使用,这几部分都会出现故障,当仪器出了毛病,我们往往从电路上考虑得比较多,而容易忽视光学和机械部分的因素,造成判断上的失误,耽误了排除故障的时间。这里举两个典型的例子:例一,将波长盘指在580 nm 处,开机,打开比色皿盒上的翻盖,调节零位,然后放下翻盖调100%,发现 721 spectrophotometer is a commonly used analytical laboratory equipment, which is composed of optical, mechanical and electrical circuits and other components. Long time use, these parts will be faulty, when the instrument is out of order, we often consider more from the circuit, and easy to ignore the optical and mechanical factors, resulting in errors on the judgment, delay the troubleshooting time. Here are two typical examples: Example 1, the wavelength of the disk means at 580 nm at the boot, open the clamshell cell tray on the regulation of zero, then put down the flip 100%, found