QMAT 5502 is listed on this site as an electromagnetic compatibility requirement for automotive electrical and electronic components, and the designator suggests an enterprise standard of a Chinese manufacturer, whose documents are internal to the company and are supplied to the component manufacturer as part of the engineering specification. Because such a standard is not published, the content available to a supplier is the controlled copy issued with the request for quotation, together with the customer's answers to the technical questions that inevitably follow, and the requirement cannot be verified independently from public sources. What can be said in general terms is that a document of this class fixes the disturbances to be applied to a component at its mounting position, the levels that correspond to that position, and the report the supplier must submit.