Since the establishment in 1994, G.R.A.S. have been 100% dedicated to developing and manufacturing high-quality measurement microphones and related acoustic equipment.
Since the establishment in 1994, G.R.A.S. have been 100% dedicated to developing and manufacturing high-quality measurement microphones and related acoustic equipment. We are founded by the Danish acoustics pioneer Gunnar Rasmussen who for more than 60 years has contributed to the world of sound and vibration with his unique ideas and designs. From the first reproducible 1” condenser measurement microphone that enabled quality measurements and instrumentation for acoustic calibration, Mr. Rasmussen’s ingenuity and foresight led to the world’s most popular acoustic sensor: The 1/2” measurement microphone. Then the 1/4” and 1/8” microphones followed with outstanding dynamic and high-frequency capability that brought higher definition and transparency into impulse noise diagnostics. Many variants have been made available over the years; all based on Gunnar Rasmussen’s original 1” pressure microphone design.
When celebrating our 20 years' anniversary in 2014 we documented the story of our founder, Gunnar Rasmussen. Order your copy of the G.R.A.S. jubilee book.
At G.R.A.S., we and our customers benefit daily from Mr. Rasmussen’s exceptional understanding of acoustics, physics, electronics and measurement needs. Not only in R&D but throughout the organisation, we are proud to develop, produce and offer the world's best measurement microphones and accessories. And as a family company, now owned and led by the two sons, Per Rasmussen and Peter Wulf-Andersen, we safeguard our heritage and knowledge to help create new opportunities with our customers. We work with everybody with an interest in sound or noise within the fields of aerospace, automotive, audiology, consumer electronics, noise monitoring, building acoustics and telecommunications, metrology, education, consultancy, legislation and system integration.
When our R&D team develops a measurement microphone, it must undergo the most demanding tests to prove that it deserves to bear the G.R.A.S. name. Using a series of “Highly Accelerated Life Tests” we ensure that our microphones live up to the high quality and precision that our customers have come to expect and trust. Our HALT tests actively accelerate the lifetime of a microphone by simulating the handling and use it is exposed to in real life situations.
We bake it, we humidify it, we shake it and we even try to break it, just to make sure that you get the very best measurement results every time. Learn more about our microphone HALT testing here.
All our microphones are solely produced in stainless steel and in a quality that allows for a 5 year warranty. Should you by mistake damage the diaphragm on a G.R.A.S. microphone, our special technique enables repair at very reasonable price.
G.R.A.S. is ISO 9001:2008 certified.
The GRAS 46DE is a 1/8'' CCP Pressure Microphone Set. The preamplifier is 1/8", making it the world's smallest microphone set. G.R.A.S. 46DE是1/8寸CCP压力麦克风。 前置放大器为1/8寸，使其成为世界上最小的麦克风。 --- Frequency Range 频率范围 : 6.5Hz to 140kHz Dynamic Range 动态范围 : 47 dB(A) to 175dB Sensitivity 灵敏度 : 0.62 V/Pa
Reliable measurements of headphones and earphones up to 20 kHz 高分辨率耳模拟器可靠测量高达20 kHz的耳机和耳机 G.R.A.S. -Improved repeatability above 10 kHz 提高10 kHz以上的可重复性 -- -Measurements below and above 10 kHz both in the same measurement setup 在相同的测量设置中测量低于和高于10 kHz的值 -- -The dampened resonance means better distortion...
43BB Low-noise Ear Simulator System 43BB低噪音耳模拟器系统 --- Volume: 1260 mm³ @ 500 HzDyn range: 10.5 dB(A) to 113 dBBased on IEC 60318-4 GRAS S&V The GRAS 43BB is a low-noise, high-sensitive ear simulator system for measurements of sound pressure levels close to or below the threshold of human hearing. GRAS 43BB是一款低噪音，高灵敏度的耳模拟器系统，用于测量接近或低于人类听觉阈值的声压级。...