ISO IEC 21118:2020 pdf download.Information technology一Office equipment一Information to be included in specification sheets for data projectors
1 Scope
This document specifies the information to be included in the specification sheets for front projection type data projectors and the form of specification sheets.
This document is not applicable to units for a rear screen projection.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7779:2018, Acoustics一Measurement of airborne noise emitted by information technology and telecommunications equipment
ISO 11201, Acoustics一Noise emitted by machinery and equipment一Determination of emission sound pressure levels at a work station and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections
IEC 60107-2:1997, Methods of measurement on receivers for television broadcast transmissions - Part 2:Audio channels一General methods and methods for monophonic channels
IEC 61947-1, Electronic projection - Measurement and documentation of key performance criteria一Part 1: Fixed resolution projectors
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
一ISO Online browsing platform: available at hts:/wwwiso.org/obp
一IEC Electropedia: available at http://www.electropedia.org/
3.1 data projector
display equipment that converts electrical signals containing image information from automatic data processing machines into optical signals and projects onto a projection screen
3.2 light valve
light-modulation device (such as a transmissive or reflective liquid crystal display, or a micro mirror device) used to create an optical image from an external light source that corresponds to an electrical signal
3.3 wide-angle end
minimum focal length position of the zoom lens
3.4 lens shift
projecting function which is vertical or horizontal repositioning of the projection lens relative to the light valve (3.2) to compensate for projector to screen alignment differences.ISO IEC 21118 pdf download.