Noise Measurement uses a Sound Level Meter (SLM), which provides a measure of the air pressure variations produced by sound waves. The pressure sensor, or microphone, is attached to the meter that displays a measured sound pressure level. The output is an amplitude of pressure variation expressed on a logarithmic scale in decibels (dB). SLM’s vary significantly in precision, stability, reliability and analysis capabilities.
SLM’s are classified into particular “classes”under international standard IEC 61672. IEC 61672 Class 1 represents the highest industry recognised precision for SLM’s which are expected to be utilised for any specialist, professional or otherwise industry recognised noise measurement.
To substantiate the validity of a professional or specialist Noise Measurement, the SLM and microphone must hold a current calibration certificate, issued by an organisation which is accredited to conduct the required calibration testing under the National Association of Testing Authorities (NATA). The validity of a Noise Measurement must also be substantiated by a record of an in-situ calibration reference check of the microphone and SLM, normally conducted with a hand-held noise calibrator which also must hold a current NATA accredited calibration certificate.
Engineering Dynamics has an extensive range of general purpose and laboratory level specialist microphones, including Sound Intensity microphone array. To support acoustic acquisition and analysis, Engineering Dynamics has laboratory-level, multi-channel signal acquisition and processing systems, and SLM’s produced by reputable manufacturers. We can develop and maintain the acoustic aspects of vibration isolation product development and production quality assurance.