GB/T 13325-1991 is a standard for the measurement of radiated noise of machines and equipment. It stipulates the basic criteria for noise measurement at the operator's position, which is an engineering-level standard. It is suitable for all kinds of industrial, civil and other machines and equipment, covering factory production line equipment, office machinery, etc. The standard specifies in detail Measuring methods, instrument requirements, measurement point arrangement and other content, providing a basis for accurately obtaining noise data of machines and equipment at the operator's position. Its significance is to help enterprises evaluate the impact of equipment noise on personnel, promote noise reduction improvement, ensure the acoustic mass of the working environment, and improve the safety and applicability of equipment.