ISO 6025:2000

INTERNATIONAL ISO
STANDARD 6025
Third edition
2000-11-01
Cinematography — Analogue photographic
sound test films, 35 mm and 16 mm —
Specifications
Cinématographie — Films pour les essais d'enregistrement sonore
photographique analogue, 35 mm et 16 mm — Spécifications
Reference number
©
ISO 2000
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ii © ISO 2000 – All rights reserved

Contents Page
Foreword.iv
1 Scope .1
2 Normative references .1
3 Specifications common to all types of photographic sound test films .2
4 Test films for checking and adjusting sound focus and azimuth .2
5 Test films for checking and adjusting the lateral position of the film in relation to the scanning
beam (buzz track).2
6 Test films for checking and adjusting uniformity of the scanning beam illumination (snake
track) .4
7 Variable area modulated test films for checking and adjusting sound level .6
8 Test films for checking and adjusting frequency response.7
9 Test films for measuring non-uniformity of film velocity of movement (flutter).8
Annex A (informative) Azimuth tolerance.9
Annex B (informative) Calculation of photoelectric output factor .10
Bibliography.11
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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 6025 was prepared by Technical Committee ISO/TC 36, Cinematography.
This third edition cancels and replaces the second edition (ISO 6025:1993), clause 1 and Table 7 of which have
been revised. Clause 2 has also been revised and a bibliography has been added.
Annexes A and B of this International Standard are for information only.
iv © ISO 2000 – All rights reserved

INTERNATIONAL STANDARD ISO 6025:2000(E)
Cinematography — Analogue photographic sound test films,
35 mm and 16 mm — Specifications
1 Scope
1.1 This International Standard specifies basic technical characteristics for the international exchange of
analogue photographic sound test films intended for checking, adjusting and measuring motion-picture projector
sound systems and sound reproducing channels of motion-picture installations for monophonic or stereophonic
reproduction.
1.2 This International Standard specifies types and technical characteristics of test films made on 35 mm and
16 mm motion-picture films.
1.3 This International Standard includes test films intended for the checking, adjusting and measuring of
a) focusing and azimuth of the scanning beam,
b) scanning beam width and its position relative to the reference edge of the film,
c) uniformity of the scanning beam illumination,
d) level output balance of several motion-picture projectors,
e) frequency response of the sound reproduction channel, and
f) non-uniformity of film travel.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 69:1998, Cinematography — 16 mm motion-picture and magnetic film — Cutting and perforating dimensions.
ISO 491:1995, Cinematography — 35 mm motion-picture film and magnetic film — Cutting and perforating dimensions.
ISO 4243:1979, Cinematography — Picture image area and photographic sound record on 16 mm motion-picture
release prints — Positions and dimensions.
ISO 7343:1993, Cinematography — Two-track photographic sound records on 35 mm motion-picture prints —
Positions and width dimensions.
IEC 60386:1972, Method of measurement of speed fluctuations in sound recording and reproducing equipment.
3 Specifications common to all types of photographic sound test films
3.1 Test films shall be made on motion-picture raw stock films, the cutting and perforating dimensions of which
shall be in accordance with ISO 491 for 35 mm film and ISO 69 for 16 mm film.
3.2 The film stock should preferably be polyester base or low-shrinkage triacetate base.
3.3 The location and width dimensions of sound records shall be in accordance with ISO 7343 for 35 mm film
and ISO 4243 for 16 mm film.
3.4 Test films shall be splice-free, except where joins are an essential part of the test film.
3.5 Each film shall be intended primarily for use at 24 frames per second. All frequencies and velocity tolerances
given in this International Standard refer to that velocity. A speed of 25 frames per second may be used. Other test
films may be developed for use at other speeds, if the speeds are so stated.
4 Test films for checking and adjusting sound focus and azimuth
The characteristics of the test signal for checking and adjusting sound focus and azimuth shall be as given in
Table 1.
Table 1
Test signal characteristic 35
...