A Comparative Measurement Microphone Study

February 4 2015, 04:00
In mid-August 2013, the SP Technical Research Institute of Sweden undertook a study to compare four brands of measurement microphones. The SP Technical Research Institute of Sweden is sort of a National Bureau of Standards for Sweden and issues investigative data on products and processes ranging from bio fuels to measurement microphones.

The study came about because the SP Technical Research Institute of Sweden had been asked to purchase four microphones of the same type from four different measurement microphone manufactures — Brüel & Kjær, BSWA, G.R.A.S. Sound and Vibration A/S, and PCB Piezotronics.

All the microphones had similar specifications and were all 0.5” Integrated Electronic Piezoelectric (IEPE) microphones with nominal 50-mV/Pa sensitivity. The microphones were purchased from their respective Swedish representatives without letting them know the purpose. The four Brüel & Kjær-type 4189-A-021 microphones were delivered in three working days, the four G.R.A.S.-type 46AE microphones were delivered in five working days, the four PCB-type 378B02 microphones were delivered in two working days, and the BSWA-type MPA201 microphones were delivered three weeks after being ordered.

The study measured the response of the microphones relative to the 250-Hz sensitivity. The study is approximately 40-pages and can be downloaded from the link provided by PCB Piezotronics at www.pcb.com/Linked_Documents/3P03218condensedreport.pdf
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