BS ISO 20711:2017 pdf free.Optics and photonics一Environmental requirements一Test requirements for telescopic systems. For the purposes of this document, the terms and definitions given in ISO 10109 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/ — ISO Online browsing platform: available at http://www.iso.org/obp extent of testing sum of all required tests to ascertain operability, as well as product performance within the intended use and life span Note ito entry: The extent of testing is subdivided into type (or sample) testing and series testing. [SOURCE: ISO 10109:2015, 2.3, modified.] type testing sample testing extent of testing required of initial or qualification samples sufficient to ascertain whether the instrument complies with all the environmental requirements of the relevant specification Note ito entry: Type (or sample) testing is designated by the code letter T. series testing extent of testing required of ensure constant production quality Note 1 to entry: Sampling procedures can be used. Note 2 to entry: Series testing is designated by the code letter S. Subdivision of the instrument group “telescopic systems” The group telescopic systems is subdivided into instrument types with the type numbers given…