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UDC 629.113
IS0
IN TER NAT1 O NAL OR GAN I ZATl O N FOR STANDARD I ZATl O N
IS0 RECOMMENDATION
R 512
SOUND SIGNALLING DEVICES ON MOTOR VEHICLES
ACOUSTIC STANDARDS AND TECHNICAL SPECIFICATIONS
1 st EDITION
October 1966
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 512, Sound Signalling Devices on Mofor Vehicles - Acoustic
Standards and Technical Specijications, was drawn up by Technical Committee ISO/TC 22, Auto-
mobiles, the Secretariat of which is held by the Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1961 and led, in 1962, to
the adoption of a Draft IS0 Recommendation.
In December 1962, this Draft IS0 Recommendation (No. 549) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
nature, by the following Member Bodies:
Australia France Poland
Austria Greece Portugal
Brazil Hungary Romania
Burma India Spain
Chile Italy Turkey
Czechoslovakia Japan U.S.S.R.
Finland New Zealand
Seven Member Bodies opposed the approval of the Draft
Belgium Switzerland
Denmark United Kingdom
Germany U.S.A.
Sweden
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in October 1966, to accept it as an IS0 RECOMMENDATION.
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ISOlR 512 - 1966 (E)
IS0 Recommendation R 512 Octo ber 1966
SOUND SIGNALLING DEVICES ON MOTOR VEHICLES
ACOUSTIC STANDARDS AND TECHNICAL SPECIFICATIONS
1. PURPOSE
This IS0 Recommendation deals with sound signalling devices
- mounted on motor vehicles
- functioning with an electrical current
- designed for use outside built-up areas.
The aim of this IS0 Recommendation is to specify their acoustic properties, such as spectral
distribution of acoustic power and sound pressure level, and also their test conditions.
2. SCOPE
The sound signalling devices have been divided into three categories, corresponding to their
operating conditions and to the vehicles on which they are used.
Type I Sound signalling devices for motor cycles without storage battery,
Type II Sound signalling devices for motor cycles with storage battery,
Type III Sound signalling devices for motor vehicles other than motor cycles.
3. TESTS
3.1 Test for apparatus not mounted on vehicle
3.1.1 Conditions of supply to the sound signalling device during the test
For sound signalling devices supplied with power at voltages of
6.5 f 0.1 V, 13.0 i 0.1 V or 26.0 f 0.1 V
at the terminals of the battery corresponding respectively to rated voltages of
6 v, 12 v, or 24 V
the resistance in the system should be the following:
- 0.05 Q for a rated voltage of 6 V
- 0.10 Q for a rated voltage of 12 V
- 0.20 Q for a rated voltage of 24 V.
The resistances at terminals and contacts are included.
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ISOlR 512 - 1966 (E)
For sound signalling devices supplied with alternating current, it is essential for the electric
current to be supplied
- either by the generator of the vehicle for which the sound signalling device is intended,
with the generator being driven as though the engine of the vehicle were running at
a rate between 70 and 100 per cent of the speed of revolution corresponding to the
maximum power of the engine;
- or, in exceptional cases where the above means of supply cannot be easily used, by a
transformer connected to a supply system at 50 Hz, provided that the same effective
voltage is obtained.
Any other electric charge on the generator of the vehicle is excluded during the test.
3.1.2 Mounting of apparatus
The apparatus to be tested should be mounted in the manner specified by the manufacturer
and in any case should be fixed rigidly on a base whose mass is ten times that of the
apparatus to be tested, and at least equal to 15 kg.
3.1.3 Sound pressure level
A sound level meter which c
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