Visual Examination
Standard Test Method for Visual Examination of Used Electrical Insulating Oils, ASTM D1524
Visual examination (D1524) on either new oil or in-service oil is a pass-fail test that looks for any foreign conditions or material in the oil sample. The “passing grade”, whether for new oil or in-service oil, is some variation of “clear and bright” – no evidence of suspended particles, cloudiness, turbidity, sediment, or any condition resulting from any contamination by solids or free water.
Visual examination (D1524) on either new oil or in-service oil is a pass-fail test that looks for any foreign conditions or material in the oil sample. The “passing grade”, whether for new oil or in-service oil, is some variation of “clear and bright” – no evidence of suspended particles, cloudiness, turbidity, sediment, or any condition resulting from any contamination by solids or free water.