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Technical Notes and Application Notes

Under this menu, you will find a listing of technical notes and application notes for download. If you are missing a specific note, please do not hesitate to contact us.

  • 147AX Positioning Guide, October 2020
  • Improved Measurement Procedures for Engine Noise Reduction with Advanced Microphones, May 2020
  • 147AX Microphone Vibration Sensitivity, April 2020
  • Engine Bay Measurements: Pressure vs Free-field Microphone, April 2020
  • RA0357 Random-Incidence Corrector for 146AE, May 2018
  • High Resolution Testing with 45CC, March 2018
  • Periodic Verification of Measurement Microphones, April 2017
  • Measurement of Impulsive Noise, April 2017 
  • Windscreens – Practical Guidelines for Acoustic Measurements in Situations with Wind Flow, May 2016
  • Acoustic Test Fixtures for Hearing Protectors, January 2015 
  • Measurements in Boundary Layers, January 2015 

Technical Information

TEDS (Transducer Electronic Data Sheet)
For technical information on TEDS, please read more here.

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GRAS worldwide

About GRAS Sound & Vibration

GRAS is a worldwide leader in the sound and vibration industry. We develop and manufacture state-of-the-art measurement microphones to industries where acoustic measuring accuracy and repeatability is of utmost importance in R&D, QA and production. This includes applications and solutions for customers within the fields of aerospace, automotive, audiology, and consumer electronics. GRAS microphones are designed to live up to the high quality, durability and accuracy that our customers have come to expect and trust.

GRAS is represented through subsidiaries and distributors in more than 40 countries. 

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GRAS Sound & Vibration 
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GRAS worldwide

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