1、 Reference number ISO 14490-2:2005(E) ISO 2005INTERNATIONAL STANDARD ISO 14490-2 First edition 2005-11-01 Optics 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: M
2、thodes dessai pour systmes binoculaires ISO 14490-2:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the
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5、m the Central Secretariat at the address given below. ISO 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from ei
6、ther ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedISO 14490-2:2005(E) I
7、SO 2005 All rights reserved iii Foreword 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 inter
8、ested in a subject for which a technical 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
9、 Commission (IEC) on all matters of electrotechnical 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 te
10、chnical committees are circulated to the 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. IS
11、O shall not be held responsible for identifying 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 Te
12、st methods for telescopic systems: Part 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
13、 Part 7: Test methods for limit of resolution The following part is under preparation: Part 8: Test methods for night-vision devices INTERNATIONAL STANDARD ISO 14490-2:2005(E) ISO 2005 All rights reserved 1 Optics and optical instruments Test methods for telescopic systems Part 2: Test methods for b
14、inocular systems 1 Scope This part of ISO 14490 is applicable to binocular telescopic systems 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
15、 magnification; focusing difference between telescopes of binocular systems. 2 Normative 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 refer
16、enced document (including any amendments) applies. ISO 14132-1:2002, Optics and optical 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
17、for binoculars, monoculars and spotting scopes ISO 14490-1:2005, Optics and optical instruments 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
18、 apply. 4 Measurement of non-parallelism of axes 4.1 General The optical axes of both telescopes 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
19、on the physiological properties of the human eye. ISO 14490-2:2005(E) 2 ISO 2005 All rights reservedThe measurement 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
20、 the test arrangement shown in Figure 1. 4.2.2 The visual axes of the collimators and measuring telescopes shall be 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 ligh
21、t source 2 condenser 3 filter (approx. 0,55 m) 4 diffusing plate 5 reticle 6 collimator lens 7 test specimen with deviation “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
22、 The test targets in the form of cross-lines shall be placed in the focal planes of the collimator objectives. 4.2.4 The focal planes of parallel measuring telescopes shall be provided with reticles that have cross-lines and measuring scales. ISO 14490-2:2005(E) ISO 2005 All rights reserved 3 4.3 Pr
23、eparation 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 reticle. 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-li
24、nes of the parallel measuring telescope reticles. The permissible displacement between centres of cross-lines shall not exceed 20 of arc. 4.3.3 After 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 mono
25、cular of the test specimen shall be brought into coincidence with the cross-line of the scale (9 in Figure 1) of the corresponding measuring telescope. 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) f
26、rom 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. 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 accepta
27、ble. 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 The test result for inclusion into the test report in accordance with Clause 8 shall state the interpupillary distances at which the measurement was carri
28、ed out. 4.4.2 The precision of measurements shall be within 3 of arc. 5 Measurement of interpupillary distance 5.1 The interpupillary distance indicated 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 app
29、aratus that consists of two parallel low magnification microscopes with eyepiece reticles. 5.2 The distance between the axes of the microscopes shall 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 shal
30、l be within 1 mm. 6 Measurement of relative difference in magnification 6.1 The difference of magnifications between the two telescopes of a binocular system is assessed by calculation of the difference of values of magnifications in each monocular, measured in accordance with ISO 14490-1:2005, Clau
31、se 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 difference of both telescopes of the instrument encountered during focusing shall be within certain limits so as to ensure normal binocular vision during
32、 observation through the binoculars. Only binoculars provided with central focusing mechanism are subject to this test. ISO 14490-2:2005(E) 4 ISO 2005 All rights reserved7.2 Test equipment The test equipment shall consist of a dioptric tester having an objective, reticle and eyepiece. The objective
33、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 tester, expressed in diopters. 7.3 Procedure 7.3.1 General The focusing difference shall be assessed in two positions: a) at inf
34、inity; b) at a measurement point in the close distance range, which shall be chosen to be 2 m 1from the mechanical close focus stop. 7.3.2 Measurement For both measuring positions the focusing difference shall be determined in consideration of the two available focusing directions of the central foc
35、using 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 except for the required change of focusing direction at the mechanical close focus stop. Set the specimen to the initial p
36、osition for making the measurement, i.e. set the central focusing mechanism and, in addition, the dioptre adjustment mechanism to about 2 m 1 . With the aid of the dioptric tester, set both telescopes to infinity using the central focusing and the dioptre adjustment mechanisms. Do not reverse the di
37、rection 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) is reached, again without reversing the direction of focusing. Determine and record the focus difference between the two
38、 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 point (and only at this point) the direction of focusing is reversed. Focus the two telescopes to the measurement point in th
39、e 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 of focusing, focus the telescopes to infinity. Again determine and record the focus difference between the two telescopes
40、. 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 dioptre scale for dioptre adjustment, instead of adjusting optically, the error of the dioptre scale will form part of the mea
41、surement result as determined by this procedure. 7.4.2 The precision of measurements shall be within 0,25 m 1 . ISO 14490-2:2005(E) ISO 2005 All rights reserved 5 8 Test report A test report shall be presented including the test results and the following information: a) test method; b) date of test;
42、 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 14490, i.e. ISO 14490-2:2005; f) name of the test laboratory; g) name of the examiner. ISO 14490-2:2005(E) ICS 37.020 Price based on 5 pages ISO 2005 All rights reserved
