在维修部分国产原子吸收分光光度计的时候,我们曾多次遇到过基线不稳的现象。这种现象往往不是因为元件损坏所引起的,较难判断引起故障的部位与原因。由于基线不稳,零点老是变化,分析工作者需要经常调节零点,不但麻烦而且影响分析的速度和准确度。引起基线不稳(在此主要指基线单方向慢漂)的原因很多,例如:高压不稳、元素灯或灯电源不稳、波长漂移等。这些原因引起的漂移,可以用仪表进行检查、观察或是换元素灯及转动波长手轮来加以判断,再排除之。本文所述及的是另一类经常遇到的现象,原因是 In repairing some domestic atomic absorption spectrophotometers, we have encountered many times the phenomenon of baseline instability. This phenomenon is often not caused by component damage, more difficult to determine the location and cause of the fault. Since the baseline is unstable and the zero point is always changing, the analyst needs to constantly adjust the zero point, which is not only troublesome but also affects the speed and accuracy of the analysis. There are many reasons that cause baseline instability (mainly referring to one-way slow drift of baseline), such as high pressure instability, instability of element lamp or lamp, and wavelength drift. Drift caused by these reasons, you can use the instrument to check, observe or change the element light and turn the wavelength handwheel to be judged, and then excluded. This article describes is another common phenomenon, because