This standard guides the performance testing of Variable Wavelength Photometric Detectors (VWPDs) in liquid chromatograph systems. It is suitable for detectors operating in the 190nm to 800nm Wavelength range. The standard describes the static performance of detectors and the dynamic performance of passing with Mobile phase carrier gas. Usually, 254nm wavelengths are used for testing, and Miscellaneous wavelengths can also be selected. The standard covers key performance indicators such as Absorbance calibrate and drift measurement of detectors to ensure their Reliability and accuracy in liquid chromatograph analysis. The standard does not address safety issues in actual use, and users need to develop their own safety and health specifications.