721分光光度计广泛应用于医疗、卫生、环保等单位的检测部门进行化学物质的定量分析。为了保证仪器的测量数值准确可靠,必须依据国家JJG178-1996可见分光光度计检定规程进行检定。在检定过程中,经常遇到仪器出现各种偏差,对此必须对偏差进行调整,这对提高仪器的检定合格率、改 721 spectrophotometer is widely used in medical, health, environmental protection and other units of the detection of chemical substances in the quantitative analysis. In order to ensure accurate and reliable measurement of the instrument values ​​must be based on the national JJG178-1996 visible spectrophotometer test procedures for verification. In the verification process, often encounter various deviations of the instrument, which must be adjusted to the deviation, which improves the instrument test pass rate, change