Industrial-process control systems; instruments with analogue inputs and two- or multi-state outputs; part 1: methods of evaluating the performance (IEC 61003-1-1991); German version EN 61003-1:1993— 18 стр.
Methods of evaluating the performance of electrical and pneumatic analogue chart recorders for use in industrial-process control systems; (IEC 60873:1986 modified); german version HD 504 S1:1988— 21 стр.