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DKE German Commission for Electrical, Electronic & Information Technologies of DIN and VDE

DIN EN 60688 [CURRENT] references following documents:

Document number Edition Title
IEC 60359 2001-12 Electrical and electronic measurement equipment - Expression of performance More 
IEC 60381-1 1982 Analogue signals for process control systems. Part 1 : Direct current signals More 
ITU-T O.41 1994-10 Psophometer for use on telephone-type circuits More