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丹麥G.R.A.S. Sound & Vibration   
　丹麥G.R.A.S.公司是——貢納·拉斯穆森先生(Gunnar Rasmussen)于1994年創立的個人全資公司。公司總部位于霍特(Holte)，距丹麥首都哥本哈根市以北約二十公里。公司產品主要為：聲學采集前端如傳聲器、前置放大器以及電信號調節適配器。貢納·拉斯穆森先生因其對噪聲及振動測量儀器發展的卓越貢獻而享譽世界。在其從業五十多年的時間里，他開發了大量的對于業界至關重要的產品，例如現代的測量傳聲器、聲級計、聲強探頭、三角剪切式加速度計以及其他許多產品。同時，他還從事于有關精密的自由場或壓力場的互易校準，活塞發聲器和激光校準等工作。

產品范圍
　　丹麥G.R.A.S.公司專注于聲學采集前端產品的研發和生產，面向要求日益嚴格的高可靠度精密測量活動，丹麥G.R.A.S.公司為您提供全方位的產品。目前已涵蓋了從換能器到輸入端模/數轉換器、聲學信號記錄等所有類型的產品。其中儀器類的主線產品是根據國際標準設計和制造，大量系列化的標準測量傳聲器和前置放大器。而對于一些特殊的應用場合，丹麥G.R.A.S.公司還為您提供一系列的特殊換能器和附件配件等，例如：聲強傳聲器、仿真耳、耳和仿真嘴、電話測試設備、人頭及軀干模擬器、活塞發聲器和校準器等。

質量保證
　　丹麥G.R.A.S.公司出品的傳聲器均由：不銹鋼材質的保護柵罩及外殼，特殊不銹鋼合金材質的振膜（為保證產品長期工作穩定可靠而特制）經過精確加工組裝而成。我們生產的高精度1級測量傳聲器，在交付后均能提供5年期的，因材料和工藝缺陷造成產品損壞的質量保證。

　　對其他儀器和產品，除了另有規定的之外，我們均提供2年期的，因材料和工藝缺陷造成產品損壞的質量保證。除上述原因提供質保以外，對于那些由于使用者疏忽、錯接電源、錯接設備等造成的損壞，以及電池及其他易損消耗件等均不在質保范圍之內。

產品改進
　　丹麥G.R.A.S.公司將持續不斷地改善自身產品的性能，可能不經通告即變更產品的外觀及規格，敬請各位用戶諒解。如需了解產品最新詳情敬請垂詢我們。
G.R.A.S. Sound & Vibration was founded in 1994 by Gunnar Rasmussen and is a 100% privately owned company. The company is located in Holte, Denmark, 20 km north of Copenhagen and produces acoustic front-end products such as microphones, preamplifiers and signal conditioning devices. Gunnar Rasmussen is well known for his numerous contributions to the development of noise and vibration measurement instrumentation. For more than 50 years in the industry he has developed a number of key products such as modern measurement microphones, sound level meters, sound intensity probes, delta shear accelerometers and many others. He has also worked with precision, free-field and pressure reciprocity calibrations, as well as pistonphone and laser calibrations.

 

Product range
The company has concentrated its efforts and expertise on the development and production of front-end acoustic products. This includes in principle all products necessary for the precise and reliable measurement, and recording of acoustic signals, from the transducer to the input of the A/D converter. The main line of instrumentation includes a broad range of standard measurement microphones and preamplifiers, all designed and manufactured in accordance with international standards. These are complemented by a wide range of more specialised transducers and accessories for more specific applications such as sound intensity microphones, artificial ears, ear and mouth simulators, telephone-testing equipment, HATS, pistonphones and calibrators etc.

Warranty
All microphones provided by G.R.A.S. Sound & Vibration are constructed with a stainless steel protection grid and housing as well as special stainless alloy diaphragm for unmatched durability and longevity. All our high precision - type 1 - measurement microphones are delivered with a five year warranty against defective materials and workmanship. All other instrumentation and products are warranted against defective materials and workmanship for a period of two years unless otherwise expressly specified. Excluded from these warranties, however, is damage that is the result of negligent use, incorrect power supplies, or incorrect connections to the equipment. Batteries and other consumables are not covered by the warranty.

Product improvements
G.R.A.S. Sound & Vibration works continuously to improve products and reserves the right to change product specifications without notice in order to take advantage of new technological developments.