ISO 6425:1984

International Standard @ 6425
~~ ~
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEXJlYHAPOLIHAR OPrAHH3AUHR Il0 CTAHLIAPTH3AUMH*ORGANlSATlON INTERNATIONALE DE NORMALISATION
0 Divers' watches
Montres de plongée
Second edition - 1984-05-15
E UDC 681.114.8-758.32 Ref. No. IS0 6425-1984 (E)
Descriptors : horological industry, time measuring instruments, watches, water, specifications, tests, marking.
s Price based on 4 pages

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Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards institutes (IS0 member bodies). The work of developing Inter-
national Standards is carried out through IS0 technical committees. Every member
body interested in a subject for which a technical committee has been set up has the
right to be represented on that committee. International organizations, governmental
e
and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
International Standard IS0 6425 was developed by Technical Committee ISO/TC 114,
Horology.
This second edition was submitted directly to the IS0 Council, in accordance with
clause 6.11.2 of part 1 of the Directives for the technical work of ISO. It cancels and
replaces the first edition (i.e. IS0 6425-19821, which had been approved by the
:
member bodies of the following countries
Czechoslovakia Italy United Kingdom
Egypt, Arab Rep. of Japan USSR
France Romania
Germany, F. R. Switzerland
No member body had expressed disapproval of the document.
O International Organization for Standardization, 1984 0
Printed in Switzerland

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INTERNATIONAL STANDARD IS0 6425-1984 (E)
Divers' watches
if L = 100, t = 1 h per day,
1 Scope and field of application
if L = 200 and more, t = 2 h per day;
This International Standard specifies requirements and test
methods for divers' watches.
followed by
b) 3 m of water for 3 h per day (Ap = 0,3 bar").
a 2 References
NOTE - L = 100, 200, 300, . stands for the intended diving depth.
IS0 764, Horology - Antimagnetic watches.
Intermediate or inferior diving depths are not allowed (see clause 8).
IS0 1413, Horology - Shock-resistant watches.
6 Requirements
IS0 2281, Horology - Water resistant watches.
6.1 Time pre-selecting device
IS0 2859, Sampling procedures and tables for inspection by at-
tributes.
The watch shall be equipped with a time pre-selecting device
for example a bezel ring. Such a device shall be protected
against inadvertent rotation and shall function correctly
throughout the whole diving range and at the maximum diving
3 Definition
depth when tested as described in 7.3.3.
diver's watch : A watch designed to withstand immersion in
The time pre-selecting device shall be provided with a minute
water at depths of at least 100 m. (Hereafter referred to as
division. The markings indicating every 5 min shall be clearly
"watch".)
indicated. Coordination between the markings on the dial if
existing and the pre-selecting device shall be provided.
NOTE - Only the full hundreds of metres shall be mentioned for
divers' watches.
The markings shall be clearly visible against the dial if existing.
0
6.2 Visibility
4 Designation
The following items of the watch shall be legible at a distance
A watch bearing the designation "diver's watch" in relation to
of 25 cm in the dark :
diving depths of 100 m and beyond or any other similar term
shall satisfy the minimum requirements laid down in clause 6.
a) indicated time;
b) set time of time pre-selecting device:
5 Practical meaning
indication that the watch is running.
c)
All operations described are intended to simulate conditions in
which divers' watches will remain undamaged and operating
after immersion at
6.3 Antimagnetic property
L
The watch shall be antimagnetic in accordance with the re-
a) L m of water for t h per day kip = - bar") :
10 quirements of IS0 764.
*
1 bar = IO5 Pa = 105 N/m2
1

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IS0 6425-1984 (E)
7 Methods of test
6.4 Shock resistance
7.1 Type testing and 100 ?40 single watch testing
The watch shall be shock resistant in accordance with the re-
quirements of IS0 1413.
Testing of the watch is divided in two groups :
6.5 Salt water resistance
- type testing;
The watch shall be salt water resistant, i.e. after submission to
- 100 % testing.
the tests as described in 7.3.3 it shall not show important
changes on the case or on the accessories and the moving
Tests for the following requirements shall be conducted as type
parts shall continue to function normally.
testing in accordance with IS0 2859 :
- time pre-selecting device;
6.6 Reliability under water pressure
- visibility;
The watch shall function normally and in particular the second
hand shall continue to function normally during and after
- antimagnetic property;
testing as described in 7.3.4.
- shock resistance;
6.7 Operation in water
- salt water resistance;
The mechanisms to be operated when submerged, for example
- reliability under water pressure;
the time pre-selecting device, lamp switch, shall function cor-
rectly when tested as described in 7.3.5.
- operation in water;
6.8 Resistance to an external force -
resistance to external force (attachments, crowns and
setting devices);
6.8.1 Attachments
- resistance to thermal shock.
No item shall become detached from the watch or be displaced
The tests for tightness, which include the testing described in
when the watch is tested as described in 7.3.1.
7.3.2 and in 7.3.8, shall be con
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