ISO/IEC 21118-2020 pdf free.Information technology一Office equipment一Information to be included in specification sheets for data projectors.
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 — Port 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 TEC 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.elcctropedia.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.
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
TableJ. 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 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 ltem” 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.
Tags: Information technology
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