BS ISO 8600-3:2019 pdf download – Endoscopes — Medical endoscopes and endotherapy devices Part 3: Determination of field of view and direction of view of endoscopes with optics 1 Scope This document applies to endoscopes designed for use in the practice of medicine. It specifies measurement requirements and describes two test methods for measuring the field of view and direction of view of endoscopes. Method A uses the distance from the distal window to calculate the field of view. Method B uses the distance from the entrance pupil. Other test methods can be used if they obtain equivalent results. 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 8600‑1, Endoscopes — Medical endoscopes and endotherapy devices — Part 1: General requirements ISO 8600‑6, Optics and photonics — Medical endoscopes and endotherapy devices — Part 6: Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8600‑1 and ISO 8600‑6 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at http://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 4 Requirements 4.1 General Method A applies only if the measuring distance is at least 30 times larger than the distance between the distal end and the entrance pupil [1] and the accuracy requirement in ISO 8600‑1 is satisfied. Otherwise, the error caused by the distance between the distal end and the entrance pupil in Method A will lead to a systematic measurement error. Method B may be used at any distance. In general, any method is allowed which has the entrance pupil as reference. Details about test Method A and Method B for measuring endoscope field of view and direction of view, including their shortcomings, accuracies, application prerequisites (e.g. endoscopes with a close focus distance and capsule endoscopes should only use Method B), etc., can be found in the reference [1] .each of the concentric circles on the target can be coincident with the maximum diagonal field of view. See Figure 1. 5.2.3 Target holder and protractor graduated in degrees. See Figure 1. 5.2.4 Target for field of view and direction...
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