Acoustics - Preferred frequencies (ISO 266:1997)

Akustik - Normfrequenzen (ISO 266:1997)

Diese internationale Norm gibt Norm frequenzen für akustiche Messungen an. Die Normfrequenzen basieren auf der Normzahlreihe R10 nach ISO 3 und der Referenzfrequenz von 1000 Hz nach ISO 31-7.

Acoustique - Fréquences normales (ISO 266:1997)

La présente Norme internationale prescrit les fréquences normales pour les mesurages acoustiques. Les fréquences normales sont basées sur la série R10 des nombres normaux de l'ISO 3 et la fréquence de référence de 1 000 Hz. Pour la plupart des mesurages acoustiques et la présentation des données, il est recommandé de choisir un espacement des fréquences basé sur un incrément constant en pourcentage, les fréquences d'essai formant alors une série géométrique. Pour certains mesurages acoustiques, l'espacement des fréquences approprié est un incrément constant. La présente Norme internationale traite de séries géométriques et n'est applicable ni aux cas où un incrément constant des fréquences ou tout autre espacement particulier seraient mieux appropriés, ni lorsqu'il peut y avoir de bonnes raisons d'adopter ou de conserver d'autres fréquences. La présente Norme internationale ne traite pas: -- des fréquences utilisées en musique; -- de toutes les fréquences audiométriques; -- d'autres séries que la série R10 de l'ISO 3.

Akustika - Prednostne frekvence (ISO 266:1997)

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SIST EN ISO 266:1998
Akustika - Prednostne frekvence (ISO 266:1997)
Acoustics - Preferred frequencies (ISO 266:1997)
Akustik - Normfrequenzen (ISO 266:1997)
Acoustique - Fréquences normales (ISO 266:1997)
Ta slovenski standard je istoveten z: EN ISO 266:1997
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
SIST EN ISO 266:1998 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 266:1998
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SIST EN ISO 266:1998
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SIST EN ISO 266:1998
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SIST EN ISO 266:1998
Second edition
~ ~~
Acoustics - Preferred frequencies
- FrGquences nor-males
Reference number
IS0 266:1997(E)
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SIST EN ISO 266:1998
IS0 266: 1997(E)
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 266 was prepared by Technical Committee
ISO/TC 43, Acoustics.
This second edition cancels and replaces the first edition (IS0 266:1975),
which has been technically revised.
Annex A of this International Standard is for information only.
0 IS0 1997

All rights reserved. Unless othewise 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 the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
Internet central @
x.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
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SIST EN ISO 266:1998
IS0 266:1997(E)
0 IS0
This International Standard specifies a series of preferred frequencies in
order to provide a common basis for comparing the results of acoustical
The frequency series is referred to the reference frequency of 1 000 Hz,
which is also the reference frequency for the definition of the phon (see
IS0 31-7).
The specification of the preferred frequency series reduces to a minimum
the number of frequencies at which acoustical data need to be tabulated.
Also measurement equipment may be specifically constructed for these
The specified series of preferred frequencies uses powers of IO and is
therefore especially convenient for extensions into the infrasonic and
ultrasonic (frequency) ranges. Another series of frequencies that is in use is
based on the definition of the octave as the frequency ratio 1:2. The
frequencies of this series are calculated as powers of two (IEC 1260 base-
two series).
Strictly, these two series are incompatible. However the base-two series
may be accepted as a sufficient approximation to the base-ten series
because of the fact that 21i3 = 1,259 9... is very near y the same as
1O1 ’1o = 1,258 9...
Practical considerations make some additional rounding desirable: Thus
500 Hz is listed instead of 501 ,187 233.. . Hz, which is the exact frequency
from the base-ten series. The calculated value of the exact frequency
expressed to five significant figures is given in the second column of
table 1. In this way, the maximum individual deviation, in the frequency
range 20 Hz to 20 000 Hz, between t

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