BS EN 60651:1994:2001 Edition
$167.15
Specification for sound level meters
| Published By | Publication Date | Number of Pages |
| BSI | 2001 | 34 |
Specifies requirements for sound level meters with respect to their immunity to power- and radio-frequency fields and to electrostatic discharge, and the permitted radio-frequency emissions, together with test procedures to demonstrate conformance to the specifications of this standard.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Cooperating organizations |
| 3 | Contents |
| 6 | Foreword Foreword to amendment A2 Contents |
| 8 | 1 Scope 1.1 General 1.2 Types 1.3 Tolerances 1.4 Characteristics specified 1.5 Tests specified 2 Object and general requirements 2.1 Object 2.2 Applications |
| 9 | 2.3 Weighting characteristics 2.4 Optional features 2.5 Method of use 3 Definitions 3.1 For the definitions of terms used in this standard, reference should be made to the Internati… 3.2 Weighted sound pressure level 3.3 Crest factor 3.4 Primary indicator range |
| 10 | 3.5 Level linearity 3.6 Reference direction 3.7 Reference frequency 3.8 Reference sound pressure level 3.9 Reference range 3.10 Reference orientation (of a sound level meter): 3.11 Group X sound level meter: 3.12 Group Y sound level meter: 3.13 Group Z sound level meter: 4 General characteristics 4.1 A sound level meter is generally a combination of a microphone, an amplifier with controlled … 4.2 The reading of the sound level meter under�the�reference conditions as defined in� 4.3 Ideally, a sound level meter is equally responsive to sounds arriving at any angle of inciden… 4.4 The output signal of the microphone is frequency weighted to produce one or more of the three… |
| 11 | 4.5 The frequency weighted signal is detected and indicated in accordance with one or more of the… 4.6 Although the frequency weighting characteristic and detector-indicator characteristic are usu… 4.7 The manufacturer shall provide the means to substitute an electrical signal for the microphon… 4.8 If the sound level meter is battery operated, suitable means shall be provided to check that … 4.9 After a warm-up period to be specified by the manufacturer, but less than 10�min in duration,… Table I Maximum change of reading, in decibels, during 1 h of operation 5 Directional characteristics of the microphone and instrument case 5.1 The manufacturer shall specify a reference direction of incidence for which the frequency wei… Table II Maximum change in sensitivity within an angle of ±30° from the reference direction, in decibels |
| 12 | Table III Maximum change in sensitivity within an angle of ± 90° from the reference direction, in decibels 6 Frequency weighting and amplifier characteristics 6.1 The complete instrument comprising the microphone, amplifier, weighting network and detector�… Table IV Frequency weighting characteristics — Relative free-field frequency response in the reference dir… |
| 13 | 6.2 The values given in� 6.3 When a level range control is included, it shall introduce errors less than those given in� Table V Tolerances |
| 14 | Table VI Tolerances on level range control accuracy in various frequency ranges, in decibels 6.4 When a manual level range control is included in a sound level meter, ranges shall overlap by… 6.5 The instrument shall be capable of meeting the crest factor requirements of� 6.6 If signals are available at filter connections and at an a.c. output, the total harmonic dist… 6.7 In order to minimize the chance of overload and to permit the widest dynamic range at high so… 7 Detector and indicator characteristics 7.1 The indication of the sound level meter with either the F or S time weightings selected shall… 7.2 In principle, an instrument possessing the F and S detector-indicator characteristics corresp… |
| 15 | Table VIII Maximum error, in decibels, for tests of crest factor (CF) capability Table VIII Response to tone bursts Table IX Maximum overshoot, in decibels |
| 16 | 7.3 In principle, an instrument possessing the I detector-indicator characteristic corresponds to… Table X Response to a single burst Table XI Response to a continuous sequence of bursts 7.4 Indications in the S, F and I detector-indicator modes shall not differ by more than�0.1�dB f… |
| 17 | 7.5 Optionally, the sound level meter may be equipped for measuring peak values. In the peak mode… 7.6 The range of the indicator, whether analogue or digital, shall be at least�15�dB. At least�10… 7.7 When an analogue indicator (meter or recorder) is provided, its scale shall be graduated in s… 7.8 When a digital indicator or other indicator with discontinuous display (e.g.�lamps with level… 7.9 The level linearity of the system, including any manual or automatic level range controls, sh… Table XII Tolerances on level linearity referred to the reference sound pressure level in the frequency ran… 7.10 The instrument shall satisfy a test for differential level linearity in addition to the test… Table XIII Tolerances on differential level linearity in the frequency range 31.5 Hz to 8 000 Hz (20 Hz to 1… |
| 18 | 8 Sensitivity to various environments 8.1 For a variation of�±10�% in static pressure, the sensitivity of the complete instrument shall… 8.2 When the microphone is replaced by an equivalent electrical impedance and the sound level met… 8.3 The influence of mechanical vibrations on the operation of the sound level meter shall be red… 8.4 The effects of magnetic and electrostatic fields shall be reduced as far as practical. Sound … 8.5 The temperature range over which the calibration of the complete instrument, including the mi… 8.6 The manufacturer shall state the range of humidity over which the complete instrument, includ… 9 Calibration and verification of the basic characteristics of the sound level�meter 9.1 The tests described in Sub-clauses� |
| 19 | 9.2 Calibration procedure and tests related to the complete sound level meter are described in Su… 9.3 Tests of the amplifier characteristics are described in Sub-clauses� 9.4 Tests of the detector and indicator characteristics are described in Sub-clauses� |
| 21 | 10 Provision for use with auxiliary equipment 10.1 If the sound level meter can be used with a cable between the microphone and the amplifier, … 10.2 If the sound level meter is provided with one or more outputs for use in driving headphones,… 10.3 If connections are provided to permit insertion of an external filter, the instructions prov… 10.4 If a d.c. output is provided, the manufacturer shall provide full details in the instruction… |
| 22 | 11 Rating information and instruction manual 11.1 A sound level meter that complies with this standard shall be marked to show the number of t… 11.2 An instruction manual shall be supplied with the sound level meter; it shall include at leas… |
| 23 | 12 Electromagnetic and electrostatic compatibility requirements and test procedures 12.1 Field of application 12.2 Emission limits |
| 24 | 12.3 Electrostatic discharges 12.4 Immunity to power- and radio-frequency fields and conducted disturbances |
| 25 | 12.5 Test procedures |
| 28 | Appendix A Tests of the overload and detection characteristics A.1 Rectangular pulse test A.2 Tone burst test |
| 29 | Appendix B Diffuse field sensitivity Appendix C Theoretical response to tone bursts |
| 30 | Appendix D (normative) Equations for design-goal frequency weightings |
| 31 | Appendix E (informative) Emission limits |
| 32 | Annex ZA(normative) Other international publications quoted in this standard with the references of the r… |
| 33 | National annex NA (informative) Committees responsible |
