ISO 14490-8:2011

INTERNATIONAL  ISO
STANDARD 14490-8
First edition
2011-09-15
Optics and optical instruments — Test
methods for telescopic systems —
Part 8:
Test methods for night-vision devices
Optique et instruments d’optique — Méthodes d’essai pour systèmes
téléscopiques —
Partie 8: Méthodes d’essai pour dispositifs de vision de nuit
Reference number
ISO 14490-8:2011(E)
©
ISO 2011
©  ISO 2011
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Published in Switzerland
ii © ISO 2011 – All rights reserved

Contents Page
Foreword . v
1 Scope . 1
2 Normative references . 1
3 General requirements for the test conditions and preparation of tests . 1
4 Test method for measuring magnification and difference in magnification . 2
4.1 General . 2
4.2 Requirements for the test arrangements and their principal parts . 3
4.3 Sequence of measurements . 5
4.4 Assessment of results . 5
5 Test method for measuring night-vision device gain . 6
5.1 General . 6
5.2 Requirements for the test arrangement and principal parts . 6
5.3 Sequence of measurements . 7
5.4 Assessment of results . 7
6 Test method for measuring the angular field of view in object space . 7
6.1 General . 7
6.2 Requirements for the test arrangement and principal parts . 7
6.3 Sequence of measurements . 8
6.4 Assessment of results . 8
7 Test method for measuring exit pupil diameter and eye relief . 9
7.1 General . 9
7.2 Requirements for the test arrangement and its principal parts . 9
7.3 Sequence of measurements .10
8 Test method for measuring the error of zero-position of the dioptre scale .10
8.1 General .10
8.2 Requirements for the test arrangement and its principal parts .10
8.3 Sequence of measurements . 11
8.4 Assessment of results . 11
9 Test method for measuring the angle of image rotation around the optical axis relative to the
object and the difference of image rotation angles .12
9.1 General .12
9.2 Requirements of the test arrangement and its principal parts .12
9.3 Sequence of measurements .13
9.4 Assessment of results .13
10 Test method for measuring non-parallelism of the axes of bundles of rays
emerging from the eyepieces of the night-vision device .13
10.1 General .13
10.2 Requirements of the test arrangement and its principal parts .13
10.3 Sequence of measurements .15
10.4 Assessment of results .15
11 Test method for measuring the limit of resolution .15
11.1 General .15
11.2 Requirements for the test arrangement and its principal parts .15
11.3 Sequence of measurements .16
11.4 Assessment of results .16
12 Test method for measuring working resolution and for determining
range of vision .16
12.1 General .16
12.2 Requirements for the test arrangement and its principal parts .17
12.3 Sequence of measurements .17
© ISO 2011 – All rights reserved  iii

12.4 Assessment of results .18
13 Test method for measuring the close distance of observation .19
13.1 General .19
13.2 Requirements for the test arrangement and its principal parts .19
13.3 Sequence of measurements .20
13.4 Assessment of results .20
14 Test method for imperfections in the field of view .20
14.1 General .20
14.2 Requirements for the test arrangement and its principal parts .20
14.3 Sequence of measurements .21
14.4 Assessment of results .22
15 Test method for measuring the continuous work time of a night-vision device .22
15.1 General .22
15.2 Requirements for the test arrangement and its principal parts .22
15.3 Sequence of measurements .22
15.4 Assessment of results .22
Bibliography .23
iv © ISO 2011 – All rights reserved

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 interested 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 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 technical 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. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 14490-8 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:
—  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
—  Part 7: Test methods for limit of resolution
—  Part 8: Test methods for night-vision devices
© ISO 2011 – All rights reserved  v

INTERNATIONAL STANDARD ISO 14490-8:2011(E)
Optics and optical instruments — Test methods for
telescopic systems —
Part 8:
Test methods for night-vision devices
1 Scope
This International Standard describes the test methods for determining the performance of night-vision devices
as specified in ISO 21094.
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 referenced document
(including any amendments) applies.
ISO 5725-1,  Accuracy (trueness and precision) of measurement methods and results — Part 1: General
principles and definitions
ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants
ISO 14490-1, Optics and optical instruments — Test methods for telescopic systems — Part 1: Test methods
for basic characteristics
ISO 14490-7, Optics and optical instruments — Test methods for telescopic systems — Part 7: Test methods
for limit of resolution
ISO 21094,  Optics and photonics — Telescopic systems — Specifications for night vision devices
3 General requirements for the test conditions and preparation of tests
Measurements shall be carried out under the normal conditions of the work area, namely:
—  air temperature: (20,0 ± 5,0) °C;
—  relative humidity of the air: 40 % to 60 %.
During measurements, the temperature shall not vary by more than ± 2 °C and the relative humidity shall not
vary by more than 4 %.
The measurements should be carried out in conditions in which the test specimen is protected from stray light
and electrical and strong magnetic fields.
The recommended i
...