BS EN IEC 60942:2018

What is BS EN IEC 60942- Electroacoustics – Sound calibrators about?  

BS EN IEC 60942 specifies the performance requirements for three classes of sound calibrators of 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 BS EN IEC 60942. 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 BS EN IEC 60942. 

BS EN IEC 60942  promote consistency of testing of sound calibrators and ease of use. 

"Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement" and Annex E "Example assessments of conformance to specifications of BS EN IEC 60942". 

Who is BS EN IEC 60942-  Electroacoustics – Sound calibrators for? 

BS EN IEC 60942 on Electroacoustics – Sound calibrators is useful for: 

• Guitar manufacturers 
• Electroacoustics engineers 
• Sound calibrator companies 

Why should you use Electroacoustics – Sound calibrators?  

According to IEC 60942, sound calibrators are designed to produce one or more known sound pressure levels at one or more specified frequencies when coupled to specified models of the microphone in specified configurations, for example, with or without a protective grid.  

The sound pressure level generated by some sound calibrators depends on the static pressure. 

IEC 60942 provides the users with the sound calibrators principal applications: 

• The determination of the electro acoustical pressure sensitivity of specified models of microphone in specified configurations 
• Checking or adjusting the overall sensitivity of acoustical measuring devices or systems 

What’s changed since the last update?  

BS EN IEC 60942:2018 supersedes BS EN 60942:2003. BS EN IEC 60942:2018 includes some technical changes with respect to BS EN 60942:2003. These include: 

• 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 
• 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