ISO IEC 21118:2020

ISO IEC 21118:2020 pdf free.Information technology – Office equipment一Information to be
included in specification sheets for data projectors.
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 term inological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at
— IEC Electropedia: available at
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
3.5 image position presentation of shifts of projected image on horizontal and vertical directions
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 “0” (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 beat 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.ISO IEC 21118 pdf download.

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