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BS EN IEC 60942:2018

BS EN IEC 60942:2018

$198.66

Electroacoustics. Sound calibrators

Published By Publication Date Number of Pages
BSI 2018 60
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This document specifies the performance requirements for three classes of sound calibrator: class LS (Laboratory Standard), class 1 and class 2. Acceptance limits are smallest for class LS and greatest for class 2 instruments. Class LS sound calibrators are normally used only in the laboratory; class 1 and class 2 are considered as sound calibrators for field use. A class 1 sound calibrator is primarily intended for use with a class 1 sound level meter and a class 2 sound calibrator primarily with a class 2 sound level meter, as specified in IEC 61672‑1 .

The acceptance limits for class LS sound calibrators are based on the use of a laboratory standard microphone, as specified in IEC 61094‑1 , for demonstrations of conformance to the requirements of this document. The acceptance limits for class 1 and class 2 sound calibrators are based on the use of a working standard microphone, as specified in IEC 61094‑4 , for demonstrations of conformance to the requirements of this document.

To promote consistency of testing of sound calibrators and ease of use, this document contains three normative annexes – Annex A “Pattern evaluation tests”, Annex B “Periodic tests”, Annex C “Pattern evaluation report”, and two informative Annexes – Annex D “Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement” and Annex E “Example assessments of conformance to specifications of this document”.

This document does not include requirements for equivalent free-field or random-incidence sound pressure levels, such as can be used in the overall sensitivity adjustment of a sound level meter.

A sound calibrator can provide other functions, for example, tonebursts. Requirements for these other functions are not included in this document.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 1 Scope
2 Normative references
15 3 Terms and definitions
17 4 Reference environmental conditions
5 Requirements
5.1 General
18 Tables
Table 1 – Sound calibrator classes and designations
19 5.2 Adaptors
20 5.3 Sound pressure level
5.3.1 General
5.3.2 Generated sound pressure level
5.3.3 Short-term level fluctuation
21 5.3.4 Sound pressure level over range of supply voltage
5.4 Frequency
5.4.1 General
5.4.2 Frequency of sound generated by the sound calibrator
Table 2 – Acceptance limits for sound pressure level and short-term level fluctuation, at and around reference environmental conditions
Table 3 – Acceptance limits for the effect of supply voltage on sound pressure level, under reference environmental conditions
22 5.5 Influence of static pressure, air temperature and humidity
Table 4 – Acceptance limits for frequency, at and around reference environmental conditions
23 5.6 Total distortion + noise
Table 5 – Acceptance limits for sound pressure level, over the specified range of environmental conditions
Table 6 – Acceptance limits for frequency, over the specified range of environmental conditions
24 5.7 Power supply requirements
5.8 Specification and calibration of microphones
5.8.1 Microphone models and adaptors
5.8.2 Microphone sensitivity level
Table 7 – Maximum total distortion + noise
25 5.9 Electromagnetic compatibility
5.9.1 General
5.9.2 Radio-frequency emissions
5.9.3 Electrostatic discharges
5.9.4 Immunity to power- and radio-frequency fields
26 6 Instrument marking and documentation
6.1 Marking of the sound calibrator
27 6.2 Individual calibration chart for a class LS sound calibrator
6.3 Instruction manual
29 Annexes
Annex A (normative) Pattern evaluation tests
A.1 General
A.2 Submission for test
30 A.3 Principal values
A.4 Marking of the sound calibrator and supplied documentation
A.5 Performance tests at and around reference environmental conditions
A.5.1 General
A.5.2 Orientation
A.5.3 Ambient noise
31 A.5.4 Microphone specification
A.5.5 Sound pressure level
32 A.5.6 Sound pressure level stability – Short-term level fluctuation
33 A.5.7 Frequency
Table A.1 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 %, for sound pressure level and short-term level fluctuation at and around reference environmental conditions
34 A.5.8 Total distortion + noise
Table A.2 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 % for frequency, at and around reference environmental conditions
35 A.6 Environmental tests
A.6.1 General
A.6.2 Influence of static pressure
Table A.3 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 % for total distortion + noise, over the appropriate range of environmental conditions
37 A.6.3 Acclimatization requirements for tests of the influence of variations in air temperature and relative humidity
A.6.4 Abbreviated test of influence of air temperature and humidity combined
Table A.4 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 %, for sound pressure level, over the specified range of environmental conditions
40 A.6.5 Influence of air temperature
Table A.5 – Maximum-permitted uncertainty of measurement for a coverage probability of 95 % for frequency, over the specified range of environmental conditions
41 A.6.6 Influence of relative humidity
42 A.6.7 Influence of air temperature and humidity combined
43 A.7 Electromagnetic compatibility
A.7.1 General
A.7.2 Radio-frequency emissions
44 A.7.3 Electrostatic discharges
45 A.7.4 Immunity to power- and radio-frequency fields
47 Annex B (normative) Periodic tests
B.1 General
48 B.2 Submission for test
B.3 Preliminary inspection
B.4 Performance tests
B.4.1 Orientation
B.4.2 Ambient noise
B.4.3 Environmental conditions
B.4.4 Additional equipment
49 B.4.5 Microphone specification
B.4.6 Sound pressure level
50 B.4.7 Frequency
B.4.8 Total distortion + noise
51 B.5 Calibration of the sound calibrator with other models of microphone
B.6 Documentation
53 Annex C (normative) Pattern evaluation report
C.1 General
C.2 Marking
C.3 Submission for test
C.4 Pattern evaluation report content
55 Annex D (informative) Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement
Figures
Figure D.1 – Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement
56 Annex E (informative) Example assessments of conformance to specifications of this document
E.1 General
E.2 Conformance criteria
E.3 Example test results
57 Table E.1 – Examples of assessment of conformance
58 Figure E.1 – Examples of assessment of conformance
59 Bibliography

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BS EN IEC 60942:2018
$198.66