UNE-EN 60051-1:1993 Electrical measuring instruments, analog display direct action and accessories. Part 1: Definition of each part and overall common requirements (Official version 60051-1: 1989)
2017UNE-EN 60051-1:2017 Direct acting indicating analogue electrical measuring instruments and their accessories - Part 1: Definitions and general requirements common to all parts (Endorsed by Asociación Española de Normalización in June of 2017.)
2000UNE-EN 60051-1:2000 DIRECT ACTING INDICATING ANALOGUE ELECTRICAL-MEASURING INSTRUMENTS AND THEIR ACCESSORIES. PART 1: DEFINITIONS AND GENERAL REQUIREMENTS COMMON TO ALL PARTS
1993UNE-EN 60051-1:1993 Electrical measuring instruments, analog display direct action and accessories. Part 1: Definition of each part and overall common requirements (Official version 60051-1: 1989)