BS EN 61672-1:2013
$198.66
Electroacoustics. Sound level meters – Specifications
| Published By | Publication Date | Number of Pages |
| BSI | 2013 | 54 |
IEC 61672-1:2013 gives electroacoustical performance specifications for three kinds of sound measuring instruments: – time-weighting sound level meters that measure exponential-time-weighted, frequency-weighted sound levels; – integrating-averaging sound level meters that measure time-averaged, frequency-weighted sound levels; and – integrating sound level meters that measure frequency-weighted sound exposure levels. Sound level meters specified in this standard are intended to measure sounds generally in the range of human hearing. Two performance categories, class 1 and class 2, are specified in this standard. Acceptance limits for class 2 are greater than, or equal to, those for class 1. This standard is applicable to a range of designs for sound level meters. A sound level meter may be a self-contained hand-held instrument with an attached microphone and a built-in display device. A sound level meter may be comprised of separate components in one or more enclosures and may be capable of displaying a variety of acoustical signal levels. Sound level meters may include extensive analogue or digital signal processing, separately or in combination, with multiple analogue and digital outputs. Sound level meters may include general-purpose computers, recorders, printers, and other devices that form a necessary part of the complete instrument. Sound level meters may be designed for use with an operator present or for automatic and continuous measurements of sound level without an operator present. Specifications in this standard for the response to sound waves apply without an operator present in the sound field. This second edition cancels and replaces the first edition published in 2002. It constitutes a technical revision. In this second edition, conformance to specifications is demonstrated when measured deviations from design goals do not exceed the applicable acceptance limits, and when the uncertainty of measurement does not exceed the corresponding maximum-permitted uncertainty, with both uncertainties determined for a coverage probability of 95 %.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | Foreword Endorsement notice |
| 5 | Annex ZA (normative) Normative references to international publications with their corresponding European publications |
| 6 | English CONTENTS |
| 8 | INTRODUCTION |
| 9 | 1 Scope |
| 10 | 2 Normative references 3 Terms and definitions |
| 12 | Figures Figure 1 – Principal steps involved in forming a time-weighted sound level |
| 16 | 4 Reference environmental conditions 5 Performance specifications 5.1 General |
| 19 | 5.2 Adjustments at the calibration check frequency 5.3 Corrections to indicated levels 5.3.1 General 5.3.2 Reflections and diffraction |
| 20 | 5.3.3 Windscreens 5.3.4 Format for correction data Tables Table 1 – Acceptance limits for the difference between a measured windscreen correction and the corresponding correction given in the Instruction Manual |
| 21 | 5.3.5 Corrections for use during periodic testing 5.4 Directional response |
| 22 | 5.5 Frequency weightings Table 2 – Acceptance limits for deviations of directional response from the design goal |
| 24 | Table 3 – Frequency weightings and acceptance limits |
| 25 | 5.6 Level linearity |
| 26 | 5.7 Self-generated noise 5.8 Time-weightings F and S 5.9 Toneburst response |
| 27 | Table 4 – Reference 4 kHz toneburst responses and acceptance limits |
| 28 | 5.10 Response to repeated tonebursts |
| 29 | 5.11 Overload indication 5.12 Under-range indication 5.13 C-weighted peak sound level |
| 30 | 5.14 Stability during continuous operation 5.15 High-level stability Table 5 – Reference differences for C-weighted peak sound levels and acceptance limits |
| 31 | 5.16 Reset 5.17 Thresholds 5.18 Display 5.19 Analogue or digital output |
| 32 | 5.20 Timing facilities 5.21 Radio frequency emissions and disturbances to a public power supply |
| 33 | 5.22 Crosstalk 5.23 Power supply Table 6 – Limits for conducted disturbance to the voltageof a public supply of electric power |
| 34 | 6 Environmental, electrostatic, and radio-frequency requirements 6.1 General 6.2 Static pressure 6.3 Air temperature |
| 35 | 6.4 Humidity 6.5 Electrostatic discharge 6.6 A.C. power-frequency and radio-frequency fields |
| 36 | 6.7 Mechanical vibration |
| 37 | 7 Provision for use with auxiliary devices 8 Marking 9 Instruction Manual 9.1 General |
| 38 | 9.2 Information for operation 9.2.1 General 9.2.2 Design features |
| 39 | 9.2.3 Power supply 9.2.4 Adjustments at the calibration check frequency 9.2.5 Corrections to indicated levels 9.2.6 Operating the sound level meter |
| 40 | 9.2.7 Accessories 9.2.8 Influence of variations in environmental conditions |
| 41 | 9.3 Information for testing |
| 43 | Annex A (informative) Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement Figure A.1 – Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement |
| 44 | Annex B (normative) Maximum-permitted uncertainties of measurement Table B.1 – Maximum-permitted uncertainties of measurement for a coverage probability of 95 % |
| 46 | Annex C (informative) Example assessments of conformance to specifications of this standard |
| 47 | Table C.1 – Examples of assessment of conformance |
| 48 | Figure C.1 – Examples of assessment of conformance |
| 49 | Annex D (normative) Frequencies at fractional-octave intervals Table D.1 – Frequencies at one-third-octave intervals |
| 50 | Table D.2 – Frequencies at one-sixth-octave intervals Table D.3 – Frequencies at one-twelfth-octave intervals |
| 51 | Annex E (normative) Analytical expressions for frequency-weightings C, A, and Z |
