EN IEC 60942:2018

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Reference environmental conditions
5 Requirements
6 Instrument marking and documentation
Annex A (normative) - Pattern evaluation tests
Annex B (normative) - Periodic tests
Annex C (normative) - Pattern evaluation report
Annex D (informative) - Relationship between
        tolerance interval, corresponding acceptance
        interval and the maximum-permitted
        uncertainty of measurement
Annex E (informative) - Example assessments of
        conformance to specifications of this document
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

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 documentcontains 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 exammple, tonebursts. Requirements for these other functions are not included in this document.