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Interlaboratory comparison of microphone calibration
1Acoustical Standards, Institute for National Measurement Standards, National Research Council Canada, Ottawa, Ontario, K1A 0R6, Canada.
The Journal of the Acoustical Society of America
|March 6, 2004
Summary
This study presents microphone calibration results from five National Metrology Institutes (NMIs). The maximum deviation was 0.037 dB, establishing a key comparison reference value for laboratory standard microphones.
Area of Science:
- Acoustics and Metrology
- Sound Measurement Standards
Background:
- Microphone calibration is crucial for accurate sound level measurements.
- Interlaboratory comparisons ensure consistency and traceability of measurement results.
Purpose of the Study:
- To present the results of an interlaboratory comparison for microphone calibration.
- To establish a key comparison reference value (KCRV) for LS1P laboratory standard microphones.
Main Methods:
- Five National Metrology Institutes (NMIs) participated in the comparison.
- The Institute for National Measurement Standards (INMS-Canada) acted as the pilot laboratory for data analysis.
Main Results:
- The maximum root-mean-square (rms) deviation among participants was 0.037 dB.
- This deviation was determined for two LS1P laboratory standard microphones.
- The agreed-upon results establish a reliable KCRV.
Conclusions:
- The interlaboratory comparison demonstrates high consistency in microphone calibration among participating NMIs.
- The established KCRV of 0.037 dB provides a benchmark for LS1P microphone calibration.
- This study enhances the global traceability of acoustic measurements.