丹麦G.R.A.S. Sound & Vibration   
　丹麦G.R.A.S.公司是——贡纳·拉斯穆森先生(Gunnar Rasmussen)于1994年创立的个人全资公司。公司总部位于霍特(Holte)，距丹麦首都哥本哈根市以北约二十公里。公司产品主要为：声学采集前端如传声器、前置放大器以及电信号调节适配器。贡纳·拉斯穆森先生因其对噪声及振动测量仪器发展的卓越贡献而享誉世界。在其从业五十多年的时间里，他开发了大量的对于业界至关重要的产品，例如现代的测量传声器、声级计、声强探头、三角剪切式加速度计以及其他许多产品。同时，他还从事于有关精密的自由场或压力场的互易校准，活塞发声器和激光校准等工作。

产品范围
　　丹麦G.R.A.S.公司专注于声学采集前端产品的研发和生产，面向要求日益严格的高可靠度精密测量活动，丹麦G.R.A.S.公司为您提供全方位的产品。目前已涵盖了从换能器到输入端模/数转换器、声学信号记录等所有类型的产品。其中仪器类的主线产品是根据国际标准设计和制造，大量系列化的标准测量传声器和前置放大器。而对于一些特殊的应用场合，丹麦G.R.A.S.公司还为您提供一系列的特殊换能器和附件配件等，例如：声强传声器、仿真耳、耳和仿真嘴、电话测试设备、人头及躯干模拟器、活塞发声器和校准器等。

质量保证
　　丹麦G.R.A.S.公司出品的传声器均由：不锈钢材质的保护栅罩及外壳，特殊不锈钢合金材质的振膜（为保证产品长期工作稳定可靠而特制）经过精确加工组装而成。我们生产的高精度1级测量传声器，在交付后均能提供5年期的，因材料和工艺缺陷造成产品损坏的质量保证。

　　对其他仪器和产品，除了另有规定的之外，我们均提供2年期的，因材料和工艺缺陷造成产品损坏的质量保证。除上述原因提供质保以外，对于那些由于使用者疏忽、错接电源、错接设备等造成的损坏，以及电池及其他易损消耗件等均不在质保范围之内。

产品改进
　　丹麦G.R.A.S.公司将持续不断地改善自身产品的性能，可能不经通告即变更产品的外观及规格，敬请各位用户谅解。如需了解产品最新详情敬请垂询我们。
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.