EN 20140-2:1993

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Akustik - Messung der Schalldämmung in Bauten und von Bauteilen - Teil 2: Angabe von Genauigkeitsanforderungen (ISO 140-2:1991)Acoustique - Mesurage de l'isolation acoustique des immeubles et des éléments de construction - Partie 2: Détermination, vérification et application des données de fidélité (ISO 140-2:1991)Acoustics - Measurement of sound insulation in buildings and of building elements - Part 2: Determination, verification and application of precision data (ISO 140-2:1991)91.120.20L]RODFLMDAcoustics in building. Sound insulation91.060.01Stavbni elementi na splošnoElements of buildings in general17.140.01Acoustic measurements and noise abatement in generalICS:Ta slovenski standard je istoveten z:EN 20140-2:1993SIST EN 20140-2:1997en01-april-1997SIST EN 20140-2:1997SLOVENSKI
STANDARD
INTERNATIONAL STANDARD ISO 140-2 Second edi tion 199 1-06-15 Acoustics - Measurement of Sound insulation in buildings and of building ekments - Part 2: Determination, verification and application of precision data Acoustique - Mesurage de l’isolation acoustique des immeubles et des Wments de construction - Partie 2: Determination, vtkification et application des donnees de fid@lit@ -. -- ---- _p--.--------------- Reference number ISO 140-2: 199 1 (E) SIST EN 20140-2:1997

ISO 140=2:1991(E) Contents Page 1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-.-. 1 2 Normative references .,_._. . . . . . . . . . . . . . . . . . . . . . . . .-.-.-. 1 3 Deflnitions . .“. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 Determination of the repeatability value r and the reproducibility value R by inter-laboratory tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5 Verification procedure . . . 6 6 Application of repeatability values Y and reproducibility values R 6 Annexes A Precision of measurements of Sound insulation in buildings and of building elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .m.e. 8 A.l General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -. .~.“.,.~. 8 A.2 Repeatability values Y for laboratory tests . . . . . . . . . . . . . . . . . . . . . . . . .-. 8 A.3 Reproducibility values R for laboratory tests . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 A.4 Field tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .I 8 B Repeatability values Y and reproducibility values R for results expressed in Single-number quantities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 C Bibliography . . . . 13 0 ISO 1991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without permlssion in writing from the publisher. International Organization for Standardization Case Postale 56 * CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii SIST EN 20140-2:1997

ISO 14002:1991(E) Fareword 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. Esch 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, govern- mental 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. Internationa! Standard ISO 140-2 was prepared by Technical Committee ISO/TC 43, Acoustics. This second edition cancels and replaces the first edition (ISO 14O-2:1978), of which it constitutes a technical revision. ISO 140 consists of the following Parts, under the general title Acoustics - Measurement of sound insuiation in buildings and of build- ing elemen ts: - Part 1: Requirements for laboratories - Part 2: Determination, verification and application of precision data - Part 3: Laboratory building elements --- Part 4: rooms -- Part 5: Field measurem elemen ts and facades -- Part 6: floors measuremen ts of airborne Sound insula tion 0 f Field measurements of airborne Sound insulation between ents of airborne Sound insulation of facade Laboratory measurements of impact Sound insulation of - Part 7: Fjeld measurements of impact Sound insulation of f7oors - Part 8: Laborstory measurements of the reduction impact noise by f7oor coverings on a stan dard floor of transmitted - Part 9: Laboratory measurement of roo m-to-room airbo insulation of a susp ended c eiling with a Plenum ab ove it rne Sound . . . Ill SIST EN 20140-2:1997

ISO 14002:1991(E) - Part 10: Laborstory measurement of airborne Sound insulation of small building elemen ts Annex A forms an integral part of this part of ISO 140. Annexes B and C are for information only. iv SIST EN 20140-2:1997

ISO 140=2:1991(E) Introduction lt is not possible to specify completely the construction of laboratory test facilities or the Sound field conditions obtained. Therefore some details of the test facilities and procedures in ISO 140-3 to ISO 140-9 are left to the choice of the Operator. This, together with the statistical Character of Sound fields within rooms, leads to uncer-tainties in the results due to non-systematic (random) and systematic influences. Random influences tan be determin ed bY rep measure ments under essentially similar mn dit ions. leated independent Systematic influences (for example, size and shape of test rooms, mounting conditions of the test specimen, calibration of measuring equipment) cannot be determined by a simple procedure. Generally, comparison measurements in different test facilities and knowledge of the random uncertainties under these conditions are necessary in Order to assess the systematic influences. In agreement with modern statistical methods, the concepts of repeat- ability and reproducibility obtained from complete test results are used in this part of ISO 140, rather than variances of the individual quantities that make up the test result. Repeatability values and reproducibility values offer a simple means of stating the precision of a test method and sf measurements carried out according 1.o the test method. The repeatability and reproducibility are two extremes, the first measuring the minimum and the second the maximum variability in test results. Other intermediate measures of variability between these two extremes are conceivable, such as repetition of tests within a laboratory over longer time intervals, or by different Operators, or including the ef- fects of recalibration, but these are not considered in this patt of ISO 140. If, in a particular Situation, some intermediate measure should be needed, it must be clearly defined, together with the circumstances un- der which it applies and the method by which it should be determined. V SIST EN 20140-2:1997

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INTERNATIONAL STANDARD ISO 140=2:199l(E) Acoustics - Measurement of Sound insulation in buildings and of building elements - Part 2: Determination, verification and application of precision data 1 Scope This part of ISO 140 specifies procedures for as- sessing the uncertainty in the acoustical measure- ments described in ISO 140-3 to ISO 140-9 due to random and systematic influences. lt gives guidelines for - determination of the repeatability value Y and the reproducibility value R; - verification of repeatability values Y and reproducibility values R for different measure- ment arrangements in one laboratory and for comparisons between different laboratories; - application of repeatability values r and reproducibility values R in practice. Tentative repeatability values and reproducibility values of the test methods according to ISO 140-3, ISO 140-4 and ISO 140-6 to ISO 140-8 are given in annex A. NOTE 1 At present no data are available for ISO 140-5 and ISO 140-9. 2 Normative references The following Standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 140. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this patt of ISO 140 are encouraged to investigate the possibility of applying the most recent editions of the Standards indicated below. Members of IEC and ISO maintain registers of currently valid lnter- national Standards. ISO 140-3:1978, Acoustics - Measurement of Sound insulation in buildings and of buiiding elements - Part 3: Laborstory measurements of airborne Sound insulation of building elements. ISO 140-4:1978, Acoustics - Measurement of Sound insulation in buildings and of building elements - Part 4: Field measurements of airborne Sound insu- lation between rooms. ISO 140-5:1978, Acoustics - Measurement of Sound insulation in buildings and of building elements - Part 5: Field meascrrements of airborne Sound insu- lation of facade elements and facades. ISO 140-6:1978, Acoustics - Measurement of Sound insulation in buildings and of building elements - Part 6: Laborstory measurements of impact Sound insulation of floors. ISO 140-7:1978, Acoustics - Measurement of Sound insulation in buildings and of building elements - Part 7: Field measurements of impact Sound insu- lation of floors. ISO 140-8:1978, Acoustics - Measurement of Sound insulation in buildings and of buiiding elements - Part 8: Laboratory measurements of the reduction of transmitted impact noise by floor coverings on a Standard floor. ISO 140-9:1985, Acoustics - Measurements of Sound insulation in buildings and of building elements - Part 9: Laboratory measurement of room-to-room airborne Sound insulation of a suspended ceiling with a plenum above it. ISO 717-1:1982, Acoustics - Rating of Sound insu- lation in buildings and of building elements - SIST EN 20140-2:1997

ISO 14002:1991(E) Part 1: Airborne Sound insulation in buildings and of interior buiiding elements. ISO 717-2:1982, Acoustics - Rating of Sound insu- lation in buiidings and of building elements - Part 2: Impact Sound insulation. ISO 717-3:1982, Acoustics - Rating of Sound insu- lation in buildings and of building elemenfs - Part 3: Airborne Sound insulation of facade elements and facades. ISO 5725:1986, Precision of test methods - Determi- nation of repeatability and reproducibility for a stan- dard test method by inter-laboratory tests. 3 Definitions For the purposes of this part of ISO 140, the follow- ing definitions apply. Whenever applicable, they are equivalent to those given in ISO 3534, ISO 5725 and in the International vocabulary of basic and general terms in metrology. 3.1 test result, y: The final value obtained in a sin- gle frequency band by following the complete set of instructions given in a test method. NOTE 2 A set of test resul ts is obtained since a deter- minati on is carri ed out in sever ,al frequency band S. 3.2 true value, u: The value characterizing a quan- tity perfectly defined under the conditions existing when that quantity is considered. For practical pur- poses, it is the arithmetic mean of test results ob- tained by a large number of laboratories. Consequently, such a practical true value is associ- ated with the particular test method. 3.3 accuracy of the mean: The closeness of agree- ment between the true value and the mean result obtained by applying the test method a very large number of times. The smaller the systematic part of the experimental errors affecting the results, the more accurate is the test method. 3.4 precision: The closeness of agreement be- tween mutually independent test results obtained under prescribed conditions. NOTES 3 Precision depends only on the distribution of random errors and does not relate to the true value or the speci- fied value. 4 Repeatability and reproducibility are concepts of pre- cision. See ISO 5725. 3.5 arithmetic mean, j? The arithmetic mean of test results, given by the equation where n is the number of test results yi. 3.6 Sample variance, s*: The sum of squares of the deviations from the arithmetic mean of test results, divided by the number of degrees of freedom. In the simple case of n consecu tive (ungroup ed) test re- sults, t he sampl e variance is gi ven by th ee quation (2) 3.7 Standard deviation, s: The Square root of the Sample variance. 3.8 number of degrees af freedom, v: The number of independent terms contained in the expression for the Sample variance. In the simple case of II consecutive (ungrouped) test results V=W--l . . . (3) 3.9 repeatability: The closeness of agreement be- tween mutually independent test results obtained under repeatability conditions. NOTE 5 Repeatability tan depend on the type of con- struction (homogeneity, resonance, etc.). 3.10 repeatabiiity conditions: Conditions where mutually independent test results are obtained with the Same method on identical test material in the Same laboratory with the Same equipment by the Same Operator within short intervals of time. 3.11 repeatability Standard deviation, s,: The stan- dard deviation of test results obtained under re- peatability conditions. lt is a Parameter of dispersion of the distribution of test results under repeatability conditions. NOTE 6 Similarly, the repeatability variance and re- peatability coefficient of Variation could be defined and used as Parameters of dispersion of test results under repeatability condi tions. 3.12 repeatability value, r: The value below which the absolute differente between two Single test re- sults obtained under repeatability conditions may be expected to lie with a probability of 95 %. 3.13 reproducibility: The closeness of agreement between test results obtained under reproducibility conditions. NOTE 7 Reproducibility tan depend on the type of con- struction (homogeneity, resonance, etc.). 2 SIST EN 20140-2:1997

ISO 140=2:1991(E) . . . (4) 3.14 reproducibility conditions: Conditions where test results arc obtained with the Same method on identical test material in different laboratories with different Operators using different equipment. 3.15 reproducibility Standard deviation, +: The Standard deviation of test results obtained under reproducibility conditions. lt is a Parameter of dis- persion of the distribution of test results under reproducibility conditions. NOTE 8 Similarly, the reproducibility variance and reproducibility coefficient of Variation could be defined and used as Parameters of dispersion of test results under reproducibility conditions. 3.16 reproducibility value, R: Value below which the absolute differente between two Single test re- sults obtained under reproducibility conditions may be expected to lie with a probability of 95 %. 3.17 confidence interval (two-sided): An interval between two estimated limits within which a statis- tical Parameter is expected to be found with a prob- ability of 95 %. 3.18 critical differente, Cr&: In statistical termi- nology, the repeatability values and the reproducibility values are critical differentes at the 95 % probability level valid for two Single test re- sults obtained under repeatability or reproducibility conditions. NOTE 9 When verifying the repeatability value Y and the reproducibility value R, it is mostly the practice to carry out more than two tests and a critical differente corre- sponding to the average of such tests will be needed. Critical differentes valid under such modified conditions tan be derived from the repeatability value Y and the reproducibility value R and are given in 4.6. 4.7 and clause 5. 4 Determination of the repeatability value r and the reproducibility value R by inter-Iaboratory tests The repeatability value Y and the reproducibility value R of a test method shall be determined by an inter-laboratory test, taking into account the consid- erations given in this clause and using various kinds of test specimens. These determinations should be repeated from time to time, especially whenever changes are made in the test method. 4.1 General The general concept and the procedure for deter- mining the repeatability value 1 Y and reproducibility value R are given in ISO 57 25. The repeatability value Y and the reproducibility value R are given by 7’= , 2BJ 2 s, = 2,84-- . . * (5) where SF is the mean of the within-laboratory vari- ances taken over all participating laborato- ries (weighted according to the number of valid results returned by the participating laboratories; see ISO 5725:1986, 11.6.1); 2 SL is the between-laboratory variance taken over all participating laboratories; 2 SR is the reproducibility variance. The factor 2,8 Comes from the fact that the repeat- ability value I’ and the reproducibility value R apply to differentes between two Single results (see ISO 57253986, 5.5). NOTE 10 The estimators $ and sf are used since true values 0: and c$ are not known. The repeatability value Y and reproducibility value R as determined from equations (4) and (5) are therefore estimatas of these quantities. The repeatability value F and reproducibility value R are determined from the test results of inter- laboratory tests. As many Operators and laborato- ries as possible should participate in such inter-laboratory tests in Order to obtain reliable test results. The proper organization and evaluation of inter-laboratory tests are cotnplicated and require special knowledge of the statistical background. They are dealt with in ISO 5725. In view of the con- siderable expense involved, the instructions given in ISO 5725 shall oe followed in every detail in Order to avoid failure of the test. Additional rules to be observed fot- use in the field of building acoustics are given below. The organization oT an inter-laboratory test involves statistical problems which should be entrusted to a statistical expert. The task of this expert is - to assist in desiqning the inter-laboratory test; - to analyse the data and to eliminate outliers by va rious statistical tests; - to calculate the repeatability values Y and reproducibility values R of the test method from the valid data. When the final repeatability values r and the reproducibility values R have been established by the means of an inter-laboratory test, it is possible to verify that they correspond to a probability of 95 %, as required by the definitions, by means of the data from which they have been computed. While not strictly necessary, this verification may serve as a check for the correctness of the calculations and the quality of the data. The procedures for this are described in 4.6 and 4.7. SIST EN 20140-2:1997

ISO 140=2:1991(E) Since the repeatability values r and the reproducibility values R are calculated from the es- timators .$ and s:, they will themselves be esti- mates, subject to errors. The probability levels associated with the repeatability values r and the reproducibility values R will therefore not be exactly 95 % but only of the Order of 95 %. Nevertheless, differentes larger than the repeatability values I’ or the reproducibility values R shall be considered suspect. 4.2 Test conditions The acoustical test conditions for determining the repeatability value r and reproducibility value R shall correspond to the conditions given in the rele- vant Parts of ISO 140. The test specimen shall not be remounted between repeated measurements. 4.2.1 Esch Iaboratory shall use its normal test pro- cedure when participating in an inter-laboratory test. The criteria which affect the repeatability of the measurement (see the relevant Parts of ISO 140) shall be carefully observed. No deviations from the test procedure laid down shall occur but, carrying out the test by repeating the measurements several times, the Parameters left open in the test procedure shall be represented as well as possible. In par- ticular, the set of microphone positions and Source positions over which averaging is carried out in one measurement shall be selected anew, more or less randomly, for each repeated measurement. NOTE 11 Very strictly defined test procedures tend to improve the repeatability of a specific laboratory but in- crease the possibility of a bias on all test results of that laboratory. Before the inter-laboratory test is started, each par- ticipating laboratory shall report the exact details of its test procedure. 4.2.2 Additional requirements for carrying out inter-laboratory tests for the test specimen Chosen shall be laid down in detail. This refers in particular to the following items: a) quantities to be me rounding numbers; asured and reported, rules for b) number of replicate tests required; c) calibration of test equipment; mounting and sealing condition S of the test specimen, and curing ti me where a ppropria fe. 4.3 Number of participating laboratories Considering the frequency dependence of the quan- tities measured in building acoustics (comparable to the “level of the test property” of ISO 5725:1986, 5.2), the number of laboratories should, from a statistical Point of view, be at least p = 8, but it is preferable to exceed this number in Order to reduce the number of replicate tests required. The number rz of test re- sults in each laboratory should be so Chosen that ~(n - 1)>35. In addition, at least five test results are needed for each laboratory. The test results ob- tained shall .not be preselected in any way by the participating laboratories before they are reported. 4.4 Requirements for stating the test results of inter-laboratory tests In Order to simplify the evaluation of test results re- ported, it is strongly desirable to supply f
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