Direct acting indicating analogue electrical-measuring instruments and their accessories - Part 1: Definitions and general requirements common to all parts (IEC 60051-1:1997); German version EN 60051-1:1998— 25 стр.
Electrical measuring transducers for converting a.c. electrical quantities into d.c. electrical quantities; general purposes transducers; identical with IEC 60688-1:1980 (status of 1988)
