IEC 60475 Method of sampling insulating liquids*, 2022-05-25 Update
IEC 60567 Oil-filled electrical equipment - Sampling of free gases and analysis of free and dissolved gases in mineral oils and other insulating liquids - Guidance*, 2023-12-08 Update
ISO 5725 Precision of test methods; Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests
ISO 6619 Petroleum products and lubricants; neutralization number; potentiometric titration method
DIN EN 62021-2:2008 history
2008DIN EN 62021-2:2008 Insulating liquids - Determination of acidity - Part 2: Colourimetric titration (IEC 62021-2:2007); German version EN 62021-2:2007