BS EN IEC 60942:2018 pdf free download

BS EN IEC 60942:2018 pdf free download.Electroacoustics – Sound calibrators (IEC 60942:2017).
5.1 General
5.1.1 A sound calibrator conforming to the requirements of this document shall have the characteristics described in Clause 5. Adaptors may be provided to accommodate more than one model of microphone. For the purpose of this document, any such adaptor is an integral part of the sound calibrator.
5.1.2 The sound calibrator shall conform to the requirements of this document for one or more of the sound pressure level and frequency combinations available. A multi-level and multi-frequency sound calibrator shall conform to the requirements for the same class designation for all sound pressure level and frequency combinations for which the instruction manual states that the instrument conforms to the requirements of this document. Conformance to the requirements of this document shall not be stated for sound pressure level and frequency settings for which this document provides no acceptance limits.
5.1.3 Throughout this document, where reference Is made to a specific class of sound calibrator, this includes all the designations under that class, unless otherwise stated.
5.1.4 Class LS sound calibrators shall be supplied with an individual calibration chart containing the information required by 6.2. For class 1 and class 2 sound calibrators, the specified sound pressure level(s) and specified frequency(ies) shall be given in the instruction manual. Each specified level shall be defined in terms of an absolute level.
5.1 .5 Class LS and class 1 pistonphones that require corrections for the influence of static pressure to conform to the specifications for the appropriate class shall have the letter M” added to their class designation. The permissible classes and designations are described in Table 1. Sound calibrators designated class LS/M and class 1/M shall not require corrections for any of the other environmental conditions to achieve the requirements specified for the appropriate class. For class LSIM and class 1/M sound calibrators, the corrections for static pressure, necessary for the sound calibrator to conform to the requirements of this document,shall be stated in the instruction manual, together with the uncertainties of measurement corresponding to a coverage probability of 95 %.
5.1.6 Sound calibrators designated class LS/M may also claim conformance to the requirements for a sound calibrator designated class 1IM if they meet the full specifications described in this document for both classes of sound calibrator.
5.1.7 Sound calibrators, other than those designated class LS/M or class 1IM, shall not require corrections for any of the environmental conditions to conform to the requirements for the relevant class.
5.1.8 Sound calibrators designated class LS/M and classl/M shall either be supplied with a barometer, or the manufacturer shall state the specifications in the instruction manual for any barometer to be used. A statement shall be included in the instruction manual giving the uncertainty of the measurement of static pressure required, for a coverage probability of 95%, so that the ability of a class LSIM or class 1/M sound calibrator to conform to the requirements for the relevant class is not affected.
NOTE 1 A class LSIM sound calibrator is normally used only in the laboratory where a suitable device ês likely to be available for measuring static pressure.
NOTE 2 Some barometers provide the data directly in the form to be used to correct measured sound pressure levels to the reference static pressure.BS EN IEC 60942 pdf download.