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1、A Reference number ISO 10996:1999(E) INTERNATIONAL STANDARD ISO 10996 First edition 1999-03-01 Photography Still-picture projectors Determination of noise emissions Photographie Projecteurs de prises de vue Dtermination des missions sonores Copyright International Organization for Standardization Pr
2、ovided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:09:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10996:1999(E) ISO 1999 All rights reserved. Unless otherwise specified, no part of this publication ma
3、y 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 CH-1211 Genve 20 Switzerland Internetisoiso.ch Printed in Switzerl
4、and ii 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 wh
5、ich 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
6、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 ISO 1
7、0996 was prepared by Technical Committee ISO/TC 42, Photography. Annexes A, B and the Bibliography of this International Standard are for information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 N
8、ot for Resale, 04/20/2007 05:09:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 10996:1999(E) iii Introduction Noise emission characteristics include both the sound power level and emission sound pressure level at the work station. The determination of these quant
9、ities allows a) manufacturers to declare the noise emitted; b) comparison of the noise emitted by equipment within the family concerned; c) experimental verification of the noise control measures taken at the design stage. The determination of one or both of the quantities can be required by, for ex
10、ample, legislation, directives, contracts or agreements. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:09:01 MDTNo reproduction or networking permitted without license from
11、IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:09:01 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 10996:1
12、999(E) 1 Photography Still-picture projectors Determination of noise emissions 1 Scope This International Standard specifies the means to determine, declare and verify the noise emission characteristics (sound power level and emission sound pressure level at the work station) of still-picture projec
13、tors. It specifies noise measurement methods and the operating and mounting conditions that shall be used for the test. The use of this International Standard ensures the reproducibility of the determination of the noise emission characteristics within specified limits determined by the grade of acc
14、uracy of the basic noise measurement method used. Noise measurement methods allowed by this International Standard are engineering methods (grade 2) and survey methods (grade 3). The engineering grade of accuracy (grade 2) is preferred and is applicable, for example, to type tests or for declaration
15、 and comparison purposes. The survey grade of accuracy (grade 3) is applicable, for example, to quality control purposes during manufacture. Survey methods usually enable measurements to be made in work rooms. 2 Normative references The following normative documents contain provisions which, through
16、 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
17、 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 IEC and ISO maintain registers of currently valid International Standards. ISO 1755, Photography Projector slides Dimens
18、ions. ISO 3744:1994, Acoustics Determination of sound power levels of noise sources using sound pressure Engineering method in an essentially free field over a reflecting plane. ISO 3746, Acoustics Determination of sound power levels of noise sources using sound pressure Survey method using an envel
19、oping measurement surface over a reflecting plane. ISO 4871:1996, Acoustics Declaration and verification of noise emission values of machinery and equipment. ISO 7574-4:1985, Acoustics Statistical methods for determining and verifying stated noise emission values of machinery and equipment Part 4: M
20、ethods for stated values for batches of machines. ISO 11203, Acoustics Noise emitted by machinery and equipment Determination of emission sound pressure levels at a work station and at other specified positions from the sound power level. Copyright International Organization for Standardization Prov
21、ided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:09:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10996:1999(E) ISO 2 3 Terms and definitions For the purposes of this International Standard, the followi
22、ng terms and definitions taken from the basic noise emission standards apply. Further terms and definitions are given in the International Standards which are designated in clause 2 and the Bibliography. 3.1 sound power level LW ten times the logarithm to the base 10 of the ratio of the sound power
23、radiated by the source under test to the reference sound power; it is expressed in decibels The frequency weighting or the width of the frequency band used shall be indicated. The reference power is 1 pW (1pW = 10-12W). EXAMPLE The A-weighted sound power level is LWA. 3.2 emission sound pressure lev
24、el Lp ten times the logarithm to the base 10 of the ratio of the square of the emission sound pressure, p2(t), to the square of the reference sound pressure, p0 2, measured with a particular time weighting and a particular frequency weighting, selected from those defined in IEC 60651; it is expresse
25、d in decibels; the reference sound pressure is 20 Pa EXAMPLES Maximum A-weighted emission sound pressure level with time weighting F: LpAF,max. C-weighted peak emission sound pressure level: LpC,peak. 3.3 noise emission declaration information on the noise emitted by the machine, given by the manufa
26、cturer or supplier in technical documents or other literature, concerning noise emission values NOTE 1The noise emission declaration may take the form of either the declared single-number noise emission value or the declared dual-number noise emission value. NOTE 2For this International Standard, th
27、e application of declared single-number noise emission values is required (see 12.2). 3.4 declared single-number noise emission value Ld the sum of a measured noise emission value L and the associated uncertainty K, rounded to the nearest decibel: Ld = L + K 3.5 reference box hypothetical surface wh
28、ich is the smallest rectangular parallelepiped that just encloses the source and terminates on the reflecting plane 4 Description of machinery family This International Standard applies to still-picture projectors, i.e. slide projectors (full-automatic, half-automatic and hand-operated), Copyright I
29、nternational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:09:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 10996:1999(E) 3 overhead projectors, episcopes. The
30、 test object is the projector as ready for use with all standard equipment, e.g. for slide projectors: cartridge with slides. 5 Sound power level determination 5.1 Basic International Standards to be used For the determination of the sound power level, one of the following basic noise emission stand
31、ards shall be preferably used: ISO 3744 (grade 2) ISO 3746 (grade 3). Other standards which may be used are ISO 3743-1, ISO 3743-2, ISO 9614-1, ISO 9614-2 for the engineering grade of accuracy (grade 2), ISO 3747, ISO 9614-1, ISO 9614-2 for the survey grade of accuracy (grade 3). 5.2 Additional spec
32、ifications The application of the basic methods of ISO 3744 or ISO 3746 within the framework of this International Standard requires the following. For the survey grade of accuracy (ISO 3746), the reference box (3.5) shall include the test table used (see clause 7 and figure 1). The measurement surf
33、ace shall be a rectangular parallelepiped which covers the reference box at a distance of d = 1 m and which terminates on the reflecting plane (see figure 1). The arrangement of the measurement positions on the measurement surface is shown in figure 1. For the measurement of the A-weighted sound pre
34、ssure levels, the time of observation at each measurement position shall be at least 10 s; for slide projectors, five slide changes (five cycles) shall be taken. If the sound pressure spectrum is being determined, the time-averaged third-octave or octave sound pressure level for each frequency band
35、within the frequency range from 100 Hz to 10 kHz shall be determined at measurement position 2 or 4 (if the operators side is there). The direction of the projection shall be that of the x-axis (see figure 1). For an example of a calculation for the engineering grade of accuracy (grade 2/ISO 3744),
36、see annex A. 5.3 Measurement uncertainty A provisional estimated value for the standard deviation of reproducibility sR for A-weighted sound power levels is 1,5 dB for grade 2 methods and 3 dB for grade 3 methods. Copyright International Organization for Standardization Provided by IHS under license
37、 with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:09:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10996:1999(E) ISO 4 Area of the measurement surface S = 4(ab + ac + bc) Figure 1 Measurement surface with nine measurement positi
38、ons for engineering grade (grade 2/ISO 3744) or with four measurement positions (1, 2, 3 and 4) for survey grade (grade 3/ISO 3746) 6 Emission sound pressure level determination 6.1 Basic International Standards to be used If it is required to determine the emission sound pressure level at the work
39、station, ISO 11203 (with Q calculated) shall be preferably used. Other standards which may be used are ISO 11201 (grade 2), ISO 11204 (grades 2 and 3) and ISO 11202 (grade 3). 6.2 Selection of relevant work station When applying ISO 11203, the work station is represented as points or paths on a surf
40、ace enveloping the still- picture projector. That surface is defined in this International Standard to be the measurement surface with d = 1 m according to figure 1, and the emission sound pressure level is derived from the sound power level. Using one of the other standards mentioned in 6.1 (ISO 11
41、201, ISO 11202, ISO 11204), the emission sound pressure level shall be determined at the measurement position 2 or 4 according to figure 1, whichever yields the higher value. 6.3 Measurement uncertainty When applying ISO 11203, the uncertainty, expressed by the standard deviation of reproducibility
42、sR, is numerically equal to this associated with the method used for determining the sound power level. Using one of the other standards mentioned in 6.1, sR is assumed to be 2,5 dB for grade 2 measurement methods and 5 dB for grade 3 measurement methods. Copyright International Organization for Sta
43、ndardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:09:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 10996:1999(E) 5 7 Installation and mounting conditions The installation and mounting
44、 conditions shall be strictly the same for the determination of both sound power level and emission sound pressure level at the work station, if relevant. The test environment shall be suitable for noise measurements according to the basic International Standards used. For ISO 3744 and ISO 3746, the
45、 environment is a more or less free field over a reflecting plane. For the engineering grade of accuracy (grade 2), the projector shall be placed, if necessary, together with its fixed substructure, on the sound-reflecting floor (floor made of, for example, concrete, stone, wood, firm synthetic mate
46、rial) of the test room. This requirement also applies to a desk top unit. In order to prevent the transmission of structure-borne noise, the installation of damping bases, if part of the delivery, is permissible. For the survey grade of accuracy (grade 3), the projector shall be placed on a rigid ta
47、ble with a small table-top (not exceeding twice the area of the projectors base surface) and a height of 1 m maximum. The table should have rubber feet. The projection direction shall be that of the x-axis. 8 Operating conditions The operating conditions shall be strictly the same for the determinat
48、ion of both sound power level and emission sound pressure level at the work station, if relevant. a) For slide projectors: The slide projectors shall be normally operated with running ventilator and cartridge filled with slides complying with ISO 1755 for automatic operation. While measuring the sound power level, the projector shall transport five slides with a slide stop of 5 s each. For manually operated slide projectors, the slide change shall be executed as