ISO/IEC 21118-2020 pdf free.Information technology —Officeequipment — Information to beincluded in specification sheets fordata projectors.
This document specifies the information to be included in the specification sheets for front projectiontype data projectors and the form of specification sheets.This document is not applicable to units for a rear screen projection.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies. Forundated references, the latest edition of the referenced document(including any amendments) applies.ISO 7779:2018,Acoustics — Measurement of airborne noise emitted by information technology andtelecommunications equipment
ISO 11201,Acoustics —Noise emitted by machinery and equipment — Determination of emission soundpressure levels at a work station and at other specified positions in an essentially free field over a reflectingplane with negligible environmental corrections
IEC 60107-2:1997,Methods of measurement on receivers for television broadcast transmissions —Part 2:Audio channels —General methods and methods for monophonic channels
IEC 61947-1,Electronic projection — Measurement and documentation of key performance criteria —Part 1: Fixed resolution projectors
For the purposes of this document, the following terms and definitions apply.
data projector:display equipment that converts electrical signals containing image information from automatic dataprocessing machines into optical signals and projects onto a projection screen.
light valve:light-modulation device (such as a transmissive or reflective liquid crystal display,or a micromirror device)used to create an optical image from an external light source that corresponds to anelectrical signal.
Table 1 lists the items that shall appear in the specification sheets. ltems whose properties shall beincluded in the specification sheets are marked as “R”(required), while other items whose propertiesare given for information are marked as “o”(optional).
Values in the specification of light output, contrast ratio (full white/full black) and centre to cornerzone ratio shall be defined as averages of productions. The lower-limit values of the product at the timeof shipment shall be at least 80 % of the values in specification sheets for these three items.
The specification sheets shall have a statement indicating accordance with this document.Theterminology shown in the”ltem”column of Table 1 shall be used in the specification sheets. Itemsmarked as optional may be omitted, along with any items that do not apply to the particular projectormodel. If an item is omitted; the order of items included in the specification sheets shall maintain thesame order as shown in Table 1.
The form of the specification sheets shall be as given in Annex A.
NOTE The term “specification sheets” applies to documents which describe the performance characteristicsof the data projector which can be included in instruction manuals, product catalogues or on websites.ISO/IEC 21118 pdf download.