IEC 60942:2017
Current
The latest, up-to-date edition.
Electroacoustics - Sound calibrators
Hardcopy , PDF
English - French
29-11-2017
IEC 60942:2017 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. This fourth edition cancels and replaces the third edition published in 2003, of which it constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) deletion of the class designations, class LS/C, class 1/C and class 2/C;
b) addition of two further class designations, class LS/M and class 1/M, specifically for pistonphones;
c) addition of an amended criterion for assessing conformance to a specification: conformance is now demonstrated when (a) measured deviations from design goals do not exceed the applicable acceptance limits and (b) the uncertainty of measurement does not exceed the corresponding maximum-permitted uncertainty;
d) modification to the short-term level fluctuation test of the sound pressure level stability;
e) change to some environmental test conditions to avoid icing;
f) addition of an alternative test for immunity to radio-frequency fields using transverse electromagnetic (TEM) waveguides.
| Committee |
TC 29
|
| DevelopmentNote |
Stability Date: 2020. (11/2017)
|
| DocumentType |
Standard
|
| Pages |
112
|
| PublisherName |
International Electrotechnical Committee
|
| Status |
Current
|
| Supersedes |
| Standards | Relationship |
| CEI EN IEC 60942 : 2018 | Identical |
| IS 15059 : 2023 | Identical |
| IS 15059 : 2018 | Identical |
| OVE EN IEC 60942: 2020 03 01 | Identical |
| DIN EN IEC 60942:2018-07 | Identical |
| JIS C 1515:2020 | Identical |
| ABNT NBR IEC 60942:2020 | Identical |
| BS EN 60974-12:2011 | Identical |
| UNE-EN IEC 60942:2019 | Identical |
| BS EN IEC 60942:2018 | Identical |
| UNE-EN IEC 60942:2018 | Identical |
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