ISO IEC 21118:2020 pdf download – Information technology — Office equipment — Information to be included in specification sheets for data projectors

03-04-2022 comment

ISO IEC 21118:2020 pdf download – Information technology — Office equipment — 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 — Measurement of airborne noise emitted by information technology and telecommunications equipment ISO 11201, Acoustics — Noise emitted by machinery and equipment — 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 — General methods and methods for monophonic channels IEC 61947-1, Electronic projection — Measurement and documentation of key performance criteria — 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: — ISO Online browsing platform: available at https:// www .iso .org/ obp — IEC Electropedia: available at http:// www .electropedia .org/
3.6 projection distance distance between the projector and the screen measured in linear units (i.e. metres, feet, or inches) Note 1 to entry: This distance is considered to be the distance from the image displayed on the screen to the outermost element of the projection lens. [SOURCE: IEC 61947-1:2002, 3.29] 3.7 rear screen projection projection with image projected through a light-transmitting screen to the audience side of the screen [SOURCE: IEC 61947-1:2002, 3.30] 3.8 standard outside dimensions maximum dimensions of the product after removing the packaging, including any protrusions 4 Measuring methods and conditions The measuring methods and conditions in terms of the performance specification items in Table 1 shall be in accordance with Annex B.
5 Items in specification sheets Table 1 lists the items that shall appear in the specification sheets. Items whose properties shall be included in the specification sheets are marked as “R” (required), while other items whose properties are given for information are marked as “O” (optional). Values in the specification of light output, contrast ratio (full white/full black) and centre to corner zone ratio shall be defined as averages of productions. The lower-limit values of the product at the time of 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. The terminology shown in the “Item” column of Table 1 shall be used in the specification sheets. Items marked as optional may be omitted, along with any items that do not apply to the particular projector model. If an item is omitted; the order of items included in the specification sheets shall maintain the same 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 characteristics of the data projector which can be included in instruction manuals, product catalogues or on websites.

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