1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58telescopic systems Part 2: Test methods for binocular systemsICS 37.020Optics and optical instrumen
2、ts Test methods for BRITISH STANDARDBS ISO 14490-2:2005BS ISO 14490-2:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 23 January 2006 BSI 23 January 2006ISBN 0 580 47135 7The British Standards which implement international publications re
3、ferred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary prov
4、isions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, page
5、s 1 to 5 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesenquiri
6、es on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduces verbatim ISO 14490-2:2005 and implements it as the UK national standard.The UK pa
7、rticipation in its preparation was entrusted to Technical Committee CPW/172, Optics and optical instruments, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any Reference numberISO 14490-2:2005(E)INTERNATIONAL STANDAR
8、D ISO14490-2First edition2005-11-01Optics and optical instruments Test methods for telescopic systems Part 2: Test methods for binocular systems Optique et instruments doptique Mthodes dessai pour systmes tlescopiques Partie 2: Mthodes dessai pour systmes binoculaires BS ISO 14490-2:2005ii iiiForewo
9、rd ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technic
10、al committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of el
11、ectrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to t
12、he member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for id
13、entifying any or all such patent rights. ISO 14490-2 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 4, Telescopic systems. ISO 14490 consists of the following parts, under the general title Optics and optical instruments Test methods for telescopic systems: Par
14、t 1: Test methods for basic characteristics Part 2: Test methods for binocular systems Part 3: Test methods for telescopic sights Part 4: Test methods for astronomical telescopes Part 5: Test methods for transmittance Part 6: Test methods for veiling glare index Part 7: Test methods for limit of res
15、olution The following part is under preparation: Part 8: Test methods for night-vision devices BS ISO 14490-2:2005blank1Optics and optical instruments Test methods for telescopic systems Part 2: Test methods for binocular systems 1 Scope This part of ISO 14490 is applicable to binocular telescopic s
16、ystems and specifies the test methods for determination of the following characteristics: non-parallelism of the axes of bundles of rays emergent from the eyepieces; interpupillary distance; relative difference in magnification; focusing difference between telescopes of binocular systems. 2 Normativ
17、e references The following referenced documents are indispensable for the application 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 14132-1:2002, Optics and optical
18、 instruments Vocabulary for telescopic systems Part 1: General terms and alphabetical indexes of terms in ISO 14132 ISO 14132-2:2002, Optics and optical instruments Vocabulary for telescopic systems Part 2: Terms for binoculars, monoculars and spotting scopes ISO 14490-1:2005, Optics and optical ins
19、truments Test methods for telescopic systems Part 1: Test methods for basic characteristics 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 14132-1 and ISO 14132-2 apply. 4 Measurement of non-parallelism of axes 4.1 General The optical axes of both t
20、elescopes of the instrument shall be parallel so as to ensure normal binocular vision during observation through the instrument. The acceptable degree of non-parallelism of optical axes of the telescopes is based on the physiological properties of the human eye. BS ISO 14490-2:20052 The measurement
21、of the non-parallelism of axes shall be carried out at the following interpupillary distances: 60 mm, 65 mm, 70 mm. 4.2 Test equipment 4.2.1 The measurements should be made by means of the test arrangement shown in Figure 1. 4.2.2 The visual axes of the collimators and measuring telescopes shall be
22、parallel. The deviation from parallelism should not exceed 20 of arc. It is permissible to use a single collimator if the diameter of the collimator lens is at least 160 mm. Key 1 light source 2 condenser 3 filter (approx. 0,55 m) 4 diffusing plate 5 reticle 6 collimator lens 7 test specimen with de
23、viation “divergence” 8 measuring telescope 9 scale Figure 1 Test arrangement for measuring non-parallelism of axes of bundles emergent from the eyepieces in binocular instruments 4.2.3 The test targets in the form of cross-lines shall be placed in the focal planes of the collimator objectives. 4.2.4
24、 The focal planes of parallel measuring telescopes shall be provided with reticles that have cross-lines and measuring scales. BS ISO 14490-2:200534.3 Preparation and carrying out of measurements 4.3.1 The eyepieces of each measuring telescope shall be adjusted to obtain the sharp image of its own r
25、eticle. 4.3.2 When the test specimen is removed, the images of the centres of cross-lines in both collimators shall coincide with the centres of cross-lines of the parallel measuring telescope reticles. The permissible displacement between centres of cross-lines shall not exceed 20 of arc. 4.3.3 Aft
26、er the test specimen has been introduced into the test arrangement in accordance with Figure 1, the image of reticle (5 in Figure 1) produced by one monocular of the test specimen shall be brought into coincidence with the cross-line of the scale (9 in Figure 1) of the corresponding measuring telesc
27、ope. From the scale (9) of the other measuring telescope the number of divisions should be read out which defines the shift of the image of reticle (5) from the centre of the scale (9) produced by the other telescope of the test specimen both in the horizontal direction and in the vertical direction
28、. 4.3.4 Instead of two telescopes arranged parallel to each other, the use of only one telescope that travels from one monocular to the other, is acceptable. The design of the telescope should provide for its travelling without any shift of the direction of the optical axis. 4.4 Test results 4.4.1 T
29、he test result for inclusion into the test report in accordance with Clause 8 shall state the interpupillary distances at which the measurement was carried out. 4.4.2 The precision of measurements shall be within 3 of arc. 5 Measurement of interpupillary distance 5.1 The interpupillary distance indi
30、cated at the appropriate scale of the test specimen shall be measured by means of callipers, or special gauge, or else by means of the dedicated test apparatus that consists of two parallel low magnification microscopes with eyepiece reticles. 5.2 The distance between the axes of the microscopes sha
31、ll be adjusted and a reading shall be taken by means of the scale that the test apparatus should be provided with. 5.3 The precision of measurements shall be within 1 mm. 6 Measurement of relative difference in magnification 6.1 The difference of magnifications between the two telescopes of a binocu
32、lar system is assessed by calculation of the difference of values of magnifications in each monocular, measured in accordance with ISO 14490-1:2005, Clause 4. 6.2 The relative error of measurement of magnifications shall be within 0,5 %. 7 Measurement of focusing difference 7.1 General The focusing
33、difference of both telescopes of the instrument encountered during focusing shall be within certain limits so as to ensure normal binocular vision during observation through the binoculars. Only binoculars provided with central focusing mechanism are subject to this test. BS ISO 14490-2:20054 7.2 Te
34、st equipment The test equipment shall consist of a dioptric tester having an objective, reticle and eyepiece. The objective or the eyepiece of the dioptric tester can be moved along the axis while the amount of this movement is read out as convergence or divergence of the bundle that enters the test
35、er, expressed in diopters. 7.3 Procedure 7.3.1 General The focusing difference shall be assessed in two positions: a) at infinity; b) at a measurement point in the close distance range, which shall be chosen to be 2 m1from the mechanical close focus stop. 7.3.2 Measurement For both measuring positio
36、ns the focusing difference shall be determined in consideration of the two available focusing directions of the central focusing mechanism (from negative powers via infinity to close distance range and vice versa). It is important that the direction of focusing not be reversed during the measurement
37、 except for the required change of focusing direction at the mechanical close focus stop. Set the specimen to the initial position for making the measurement, i.e. set the central focusing mechanism and, in addition, the dioptre adjustment mechanism to about 2 m1. With the aid of the dioptric tester
38、, set both telescopes to infinity using the central focusing and the dioptre adjustment mechanisms. Do not reverse the direction of focusing during this procedure. Using the central focusing mechanism, focus both telescopes further until the measurement point in the close distance range see 7.3.1 b)
39、 is reached, again without reversing the direction of focusing. Determine and record the focus difference between the two telescopes by use of the dioptric tester. Further focus both telescopes by use of the central focusing mechanism until the mechanical close distance stop is reached. At this poin
40、t (and only at this point) the direction of focusing is reversed. Focus the two telescopes to the measurement point in the close distance range. As before, determine and record the focus difference between the two telescopes. Using the central focusing mechanism, and without reversing the direction
41、of focusing, focus the telescopes to infinity. Again determine and record the focus difference between the two telescopes. 7.4 Test results 7.4.1 From the three determinations made during the measurement procedure the greatest value shall be taken as the measurement result. NOTE When using the diopt
42、re scale for dioptre adjustment, instead of adjusting optically, the error of the dioptre scale will form part of the measurement result as determined by this procedure. 7.4.2 The precision of measurements shall be within 0,25 m1. BS ISO 14490-2:200558 Test report A test report shall be presented in
43、cluding the test results and the following information: a) test method; b) date of test; c) identification of the test specimen; d) details about the test arrangement and/or procedure, if required and/or if different from those specified in this part of ISO 14490; e) reference to this part of ISO 14
44、490, i.e. ISO 14490-2:2005; f) name of the test laboratory; g) name of the examiner. BS ISO 14490-2:2005BS ISO BSI389 Chiswick High RoadLondonW4 4AL14490-2:2005BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view o
45、n standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the qual
46、ity of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0
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