1、BRITISH STANDARD BS 3539:1986 Implementing Amendment No.1, not published separately Specification for Sound level meters for the measurement of noise emitted by motor vehicles ICS 17.140.30; 17.140.50BS3539:1986 The BritishStandard, having beenprepared under the directionof the Electronic Equipment
2、Standards Committee,was published underthe authority of the BoardofBSI and comes intoeffecton 28February1986 BSI 03-2000 First published September 1962 First revision February 1986 ISBN 0 580 15083 6 Committees responsible for this BritishStandard The preparation of this BritishStandard was entruste
3、d by the Electronic Equipment Standards Committee (EEL/-) to Technical Committee EEL/24 upon which the following bodies were represented: British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Department of Health and Social Security Department of Trade and I
4、ndustry (National Physical Laboratory) Institution of Electronic and Radio Engineers Royal National Institute for the Deaf Society of Hearing Aid Audiologists Limited The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Medical Associa
5、tion British Society of Audiology Health and Safety Executive Hearing Aid Industry Association Institute of Acoustics Institute of Sound and Vibration Research Manchester Area Health Authority Medical Research Council Ministry of Defence National Coal Board Royal Aeronautical Society Amendments issu
6、ed since publication Amd. No. Date of issue Comments 10448 April 1999 Indicated by a sideline in the marginBS3539:1986 BSI 03-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Requirements 1 3 Laboratory verification of the accuracy 1 4 Information to be provided
7、 2 Publications referred to Inside back coverBS3539:1986 ii BSI 03-2000 Foreword This BritishStandard has been prepared under the direction of the Electronic Equipment Standards Committee and applies to sound level meters used for the measurement of the noise emitted by motor vehicles, for example,
8、in accordance with the methods described in BS3425. It supersedes BS3539:1962, which is withdrawn, and specifies sound level meters with more stringent tolerances, corresponding to the Type1 instrument in BS EN60651:1994, which is identical with IEC60651:1979. BS5969:1981 has been renumbered as BS E
9、N60651:1994, and all previous references to BS5969:1981 in this standard have been amended accordingly. The draft International Standard IEC61672 Sound level meters, when published as a BS EN, will replace BS EN60651. It specifies wider tolerances to include measurement uncertainties which are not i
10、ncluded in BS EN60651. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages T
11、his document comprises a front cover, an inside front cover, pagesi andii, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS3539:1
12、986 BSI 03-2000 1 1 Scope This BritishStandard specifies the particular requirements for sound level meters for the measurement of noise emitted by motor vehicles, the procedure for laboratory verification of their accuracy and the information to be shown on a calibration certificate. NOTEThe titles
13、 of the publications referred to in this standard are listed on the inside back cover. 2 Requirements 2.1 The sound level meter including auxiliary equipment, for example, a microphone extension cable or a windshield, shall comply with the requirements for type1 meters as specified in BSEN60651:1994
14、. 2.2 It shall incorporate the frequency weighting characteristic designated A and the time weighting characteristic designated F (as specified in6.1 and 7.2 respectively of BS EN60651:1994). 2.3 The minimum range of the sound level meter shall be70 to110 dB(A). 2.4 To avoid errors which may arise f
15、rom the presence of the observer, the sound level meter shall either include a mode in which the maximum weighted sound pressure level in a measuring time interval is held (stored) in the display (see7.8 of BSEN60651:1994) or be provided with a microphone extension cable not less than3m long. 2.5 La
16、boratory verification of the accuracy of the meter shall be carried out as specified in clause3 at regular intervals, normally annually. 3 Laboratory verification of the accuracy 3.1 The procedure for laboratory verification shall be as given in a) to d). a) To set up the sound level meter, the soun
17、d calibrator associated with the sound level meter (seenote) shall be applied to the meter and the meter adjusted so that its reading corresponds to the reading obtained as specified in3.1 d) during the previous verification. If the results for the previous verification are not available (forexample
18、, because the sound level meter has not been tested previously) or are invalid (forexample, because a new sound calibrator is being used with the sound level meter), the sound level meter shall be adjusted so that its reading corresponds to the output level of the sound calibrator specified on the m
19、ost recent calibration certificate for the calibrator. The reading of the sound level meter shall be recorded. NOTE 1The sound level calibrator should conform to BS7189:1989 or to BS EN60942:1998, depending on the standard to which the calibrator was originally manufactured. b) The electrical tests
20、specified in3.3, 3.4, 3.5 and3.6 shall be carried out with an equivalent electrical impedance substituted for the microphone. c) The acoustic calibration specified in3.7 shall be carried out. d) The sound calibrator shall again be applied to the sound level meter, and the reading of the meter record
21、ed. The tolerances given in this standard and in BSEN60651:1994, BS7189:1989 and BSEN60942:1998 (which supersedes BS7189:1989) do not take into account any measurement uncertainty of the laboratory performing the verification. The measured values obtained during a verification shall not be extended
22、by any measurement uncertainty when assessing whether an instrument conforms to this standard. Conformity is demonstrated when all measured values are within the specified tolerances. NOTE 2It is recommended that the calibration certificate states, if appropriate, that verification does not accommod
23、ate measurement uncertainty. 3.2 For all tests of the sound level meter the configuration used for measuring vehicle noise, for example with an extension cable, shall be used. All tests shall be carried out with the frequency weighting A and time weighting F settings of the sound level meter. 3.3 Th
24、e A-weighting response shall be checked electrically at frequencies of63 Hz,125 Hz, 250Hz,500 Hz,1000Hz,2000Hz,4000Hz and8000Hz. The signal level at1000Hz shall give an indication of94 dB. Where the A-weighted signal level is different at the other test frequencies any necessary correction for level
25、 range control or scale linearity shall be made. Any corrections for the frequency response of the microphone and, where appropriate, of the effect of the instrument case and windshield, shall be made to the indications. The data shall be provided with the equipment.BS3539:1986 2 BSI 03-2000 The res
26、ponse shall meet the frequency response and tolerances for the A-weighting characteristic specified in Tables IV and Table V of BSEN60651:1994, with the reference frequency defined as1000Hz, as follows: 3.4 The linearity of the system consisting of the detector-indicator and any manual or automatic
27、range controls shall be tested at1000Hz at integral decibel scale intervals over the range from70 to110 dB (A). The accuracy relative to a reference level of94dB shall be as specified in Table XII of BS EN60651:1994 as follows: 3.5 The time weighting F shall be tested with a single sinusoidal burst
28、of duration200 ms at a frequency in the range1000Hz to2000Hz and an amplitude which produces an indication of106dB when the signal is continuous. The lowest setting of the level range control which includes106dB shall be used. The maximum response to the test tone burst relative to the response to a
29、 continuous signal shall be1.0 1dB as specified in Table VIII of BSEN60651:1994. Where the “maximum r.m.s. hold F” characteristic is provided this shall be tested under the same conditions and to the same tolerance. NOTEThe value of106 dB is chosen for consistency with BS5969 for an upper limit of11
30、0dB. 3.6 The r.m.s accuracy of the detector indicator system shall be tested by comparing the indication for a sequence of tone bursts with that for a continuous sinusoidal signal. The frequency of the signals shall be2000Hz, at an amplitude which produces an indication of108dB when the signal is co
31、ntinuous. The lowest setting of the level range control which includes108dB shall be used. The tone burst shall consist of11 cycles of a sine wave of frequency2000Hz, starting and ending at zero crossing, with a repetition frequency of40Hz and having an r.m.s. value which is identical to that of the
32、 continuous sine wave signal. The indication for the tone burst shall be within 0.5dB of that of the continuous signal as specified in Table VII of BSEN60651:1994 NOTEThe value of108dB is chosen to allow for the tolerance at the upper limit of110dB. 3.7 The acoustic calibration of the complete sound
33、 level meter shall be performed at125Hz and1000Hz. The tests shall be carried out either in a plane progressive sound field or using an acoustic coupler. If an acoustic coupler is used, a correction shall be made for any effect of the instrument case and, where relevant, the windshield on the calibr
34、ation. The ambient conditions of static pressure, temperature and relative humidity shall be recorded. Where the125Hz acoustic calibration is not carried out at the same A-weighted sound level as the1000Hz calibration, any necessary correction for the level range control or scale linearity shall be
35、made. The sound level meter shall meet the frequency response and tolerances for the A-weighting characteristic at the two test frequencies, and the sensitivity of the sound level meter shall be reset ifnecessary to read correctly at1000Hz. NOTEThe1000Hz test should preferably be carried out at a so
36、und pressure level of94dB. 4 Information to be provided A calibration certificate shall be issued giving the following information. a) The name of the manufacturer, the model number and the serial number of the sound level meter. b) Identification of the microphone fitted to the sound level meter to
37、gether with any connecting cables and/or other accessories. Frequency Relative response Tolerances Hz dB dB 63 26.2 1.5 125 16.1 1 250 8.6 1 500 3.2 1 1000 0 0 2000 +1.2 1 4000 +1.0 1 8000 1.1 +1.5, 3 Readings Tolerances dB Inside primary indicator range 0.7 Outside primary indicator range 1.0BS3539
38、:1986 BSI 03-2000 3 c) The name of the manufacturer, the model number and the serial number or other unique identifying mark of the sound calibrator used for routine field calibration together with identification of any adaptors or other accessories used in the field calibration. d) The readings obt
39、ained in3.1 a) and3.1 d) of this standard. NOTEThe reading obtained in3.1 d) is to be used for setting up the sound level meter for field use and for the next periodic recalibration of the sound level meter. e) A statement that the sound level meter has been calibrated as specified in this standard.
40、 f) A statement that the sound level meter complies with the tolerances specified in this standard. g) The date of calibration.4 blankBS3539:1986 BSI 03-2000 Publications referred to BS 3425, Method for the measurement of noise emitted by motor vehicles 1) . BS EN 60651:1994, Specification for sound
41、 level meters. 1) Referred to in the foreword only.BS 3539:1986 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It i
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