721分光光度计是各级医院检验科室常见的检验仪器，使用率高、性能可靠稳定。但也会出现故障，零点漂移就是其中的一种。零点漂移产生的原因各不相同，本文根据表头指示现象，分析检查相应损坏元件，能较快地修复仪器。门）打开比色器昭盒盖，接通仪器电源，表外缓慢向左移动， 721 spectrophotometer is a common laboratory inspection instruments at all levels of hospitals, high utilization, reliable performance and stability. But there will be failure, zero drift is one of them. Zero drift occurs for different reasons, this article according to the phenomenon of header instructions, analysis and inspection of the corresponding damaged components, can quickly repair the instrument. Door) Open the cuvette lid, turn on the instrument, move slowly to the left outside the watch,