Fecha de publicación: 03/07/1991 Amendment 1 – Classification of environmental conditions. Part 3: Classification of groups of environmental parameters and their severities. Ship environment IEC 60721-3-6:1987/AMD1:1991
Fecha de publicación: 10/07/1991 Methods of measurement for radio equipment used in the mobile services – Part 4: Transmitters employing single-sideband emissions (R3E, H3E or J3E) IEC 60489-4:1991
Fecha de publicación: 18/07/1991 Classification of environmental conditions – Part 2: Environmental conditions appearing in nature – Section 5: Dust, sand, salt mist IEC 60721-2-5:1991
Fecha de publicación: 18/07/1991 Amendment 1 – Pre-recorded optical reflective videodisk system ‘Laser vision’ 60Hz/525 lines – M/NTSC IEC 60857:1986/AMD1:1991
Fecha de publicación: 18/07/1991 Amendment 1 – Pre-recorded optical reflective videodisk system ‘Laser vision’ 50Hz/625 lines – PAL IEC 60856:1986/AMD1:1991
Fecha de publicación: 19/07/1991 Pneumatic instruments driven by associated process gas – Safe installation and operating procedures – Guidelines IEC TS 61081:1991
Fecha de publicación: 02/08/1991 Semiconductor devices. Integrated circuits – Part 3: Analogue integrated circuits – Section one: Blank detail specification for monolithic integrated operational amplifiers IEC 60748-3-1:1991
Fecha de publicación: 01/09/1991 Corrigendum 1 – Sound system equipment. Part 17: Standard volume indicators IEC 60268-17:1990/COR1:1991
Fecha de publicación: 01/10/1991 Semiconductor devices – Integrated circuits – Part 2-1: Digital integrated circuits – Blank detail specification for bipolar monolithic digital integrated circuit gates (excluding uncommitted logic arrays) IEC 60748-2-1:1991
Fecha de publicación: 15/10/1991 Helical-scan video tape cassette system using 12.65 mm (0.5 in) magnetic tape on type VHS – Compact VHS video cassette IEC 61077:1991