IEC 60942 Ed. 4.0 b:2017

Current Revision
Electroacoustics - Sound calibrators

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Electroacoustics - Sound calibrators

PUBLISH DATE 2017
PAGES 114

Electroacoustics - Sound calibrators

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:

  • deletion of the class designations, class LS/C, class 1/C and class 2/C;
  • addition of two further class designations, class LS/M and class 1/M, specifically for pistonphones;
  • 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;
  • modification to the short-term level fluctuation test of the sound pressure level stability;
  • change to some environmental test conditions to avoid icing;
  • addition of an alternative test for immunity to radio-frequency fields using transverse electromagnetic (TEM) waveguides.
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