"DZ 0039.16-1992 basic environment for geological instrument products. Test conditions and methods. Sulfur dioxide test" specifies the test conditions and methods for geological instrument products and their materials in the presence of sulfur dioxide environment. This standard is applicable to the sulfur dioxide test of various geological instrument products in an environment containing sulfur dioxide. The purpose is to evaluate the product's resistance to sulfur dioxide corrosion. The test method is carried out in accordance with the sulfur dioxide test method for contact points and connectors in "GB 2423.19-81 Basic environmental test procedures for electrical and electronic products". The test report shall comply with the requirements of "DZ 0039.1". If the parts, materials and protective samples have been proved to meet the requirements of sulfur dioxide corrosion resistance, this test may be exempted.