GRAS測量麥克風(fēng)146AE專(zhuān)門(mén)用于汽車(chē)測試等惡劣環(huán)境
GRAS測量麥克風(fēng) GRAS放大器 GRAS* GRAS風(fēng)球 GRAS技術(shù)資料 GRAS辦事處 GRAS代理 GRAS一級經(jīng)銷(xiāo)商
測量麥克風(fēng)集已經(jīng)結合起來(lái)，所以它們滿(mǎn)足了用戶(hù)的典型測量需求。獨立于您的測量系統和應用程序，您應該能夠找到一套適合您的需求。麥克風(fēng)組可以直接連接到所有專(zhuān)業(yè)測量系統，并指示它們可用于CCP和7引腳LIMO輸入。 Dimensions  如果你的測量平臺支持IEEE 1451.4（TEDS）的智能換能器，你可以簡(jiǎn)單地插入麥克風(fēng)，他們將用自己的特性、類(lèi)型和校準數據來(lái)識別自己。多頻道用戶(hù)特別欣賞的特性。
CCP組使用高質(zhì)量的同軸電纜，而LeMo組使用一種特殊的、軟的多芯屏蔽電纜。如果要使用延長(cháng)電纜，你應該考慮對上部頻率和動(dòng)態(tài)范圍的可能影響。
所有麥克風(fēng)組都是作為一個(gè)單元傳送的，并相應地進(jìn)行校準。這些集合用校準圖遞送，包括完整集的靈敏度值和頻率響應曲線(xiàn)。因此，靈敏度值可以直接在系統設置中使用。
為了頻繁地測量測量鏈，需要一個(gè)聲源。GRAS為此提供了一個(gè)114分貝的聲音校準器。根據使用情況和內部質(zhì)量控制要求，我們建議至少每隔一年重新校準一次。為了更的驗證，我們建議用活塞式校準。GRAS供應114dB和134dB活塞式。此外，我們建議對一個(gè)可靠的參考聲源的校準。GRAS提供校準服務(wù)，并推薦每隔一年校準一次。
GRAS 146AE 1/2'' CCP Free-field Rugged Microphone Set
設計用于實(shí)際生活條件
146AE是世界上個(gè)堅固耐用的CCP麥克風(fēng)，專(zhuān)門(mén)設計用于在現實(shí)生活中遇到的惡劣環(huán)境和條件下可靠地工作，如強振動(dòng)、沖擊、跌落、溫度和潮濕或灰塵條件。
146AE的堅固設計使得在同一汽車(chē)測試裝置中僅使用單一類(lèi)型的麥克風(fēng)執行許多不同類(lèi)型的測量成為可能。這不僅提高了你的NVH測試性能和數據質(zhì)量在崎嶇的條件下，它也延長(cháng)了你的測量設置的壽命。沒(méi)有必要重復昂貴且耗時(shí)的測試，同時(shí)提供、有效的數據和高性能。
Introduction
GRAS 146AE is a rugged microphone specifically developed for harsh environments like Automotive testing. It combines the high precision and stability of a laboratory microphone with an unprecedented level of ruggedness, i.e. ability to work properly under adverse conditions such as shock, high temperatures, moisture, water spray, oil mists and dust. *For a short introduction to HALT, see the section "GRAS HALT" above **International Protection Marking, IEC standard 60529. ***IP67: Totally protected against dust, protected against the effect of water of up to 1 m of submersion.
IP test according to IEC 60529:2013 performed by DELTA - a part of FORCE Technology, Venlighedsvej 4, 2970 Hørsholm, Danmark. 
Typical free field response. GRAS Sound & Vibration reserves the right to change specifications and accessories without notice. A new Paradigm for Automotive Testing
With the accuracy of an IEC 61094-4/WS2F measurement microphone and ruggedness combined in one microphone you can now use a state of the art microphone that provides the advantage of quality and stability over an extended period of time, even when subjected to rough conditions. You can make critical quality measurements without having to replace the microphones, and in this way enhance the confidence in your measurements while at the same time minimizing downtime and maintenance costs. Not having to reconfigure the measurement setup again and again reduces costs and makes measurements easily comparable. This microphone is specifically designed to resist vibrations, shock and drop, and to produce accurate and repeatable measurements under harsh conditions. Application specific test fixtures, cables and accessories ensure easy positioning and handling. An integrated PowerOn LED indication shows when the microphone is connected and ready to measure. If there is a faulty connection the LED will not be lit during power up. Finally it will light up when the TEDS chip is read. This feature makes it possible to run a full "are we ready to measure?" test of all connected microphones by sequentially activating their TEDS. The 146AE is IP67 rated. All exposed parts are protected by water and oil repellent coating, which also is easy to clean. The coating can withstand heat and chemicals. In addition to the microphone set's basic resilience against shock, dirt and moisture a replaceable protective grid with water and dust filter adds an extra layer of flexible protection, including protection against high-velocity particles. This makes the microphone specifically well suited for high humidity, oil splash or outdoor measurement conditions. Simply replacing the filter-grid assembly will add to the time the microphone set can be mounted in the same test configuration. The 146AE has the same low temperature coefficient as a standard measurement microphone set as for example GRAS 46AE, but can withstand permanent exposure to temperatures from -40 to 125°C with no permanent change to its sensitivity. Comprehensively Tested
HALT
At GRAS we know that in order for you to trust your measurement results, signal quality, stability and robustness are essential. And because we also know how you handle and use the microphones in your daily work, we conduct a series of Highly Accelerated Lifetime Tests (HALT) to make sure that they perform under real life conditions. For the new rugged line of microphones, we have made our HALT even more challenging to reflect the extreme harsh environments and conditions in NVH measurements. It is vibrated for 60 hours at 8g, kept in temperatures varying from -40°C to +125°C , dropped horizontally and vertically from 150 cm on a hard surface and put through a tumbling test randomly falling 100 cm on a floor 100 times. IP67 Certification
Furthermore, the 146AE is certified water and dust-proof (IP67). Typical Applications and Use
The 146AE is a free-field microphone set designed for use in rough conditions such as NVH testing in the automotive industry. It is specifically designed for applications such as: Engine noise vibration testing Acoustic performance testing Pass by noise testing Power train induced noise Computer Model Validation/CAE validation Accelerated Life Cycle Testing Interior noise (Roof, AirCon, Squeak and Rattle) Entertainment and Communication, Voice control Vehicle component evaluations and certifications (Brake, Tire, Exhaust) Testing at temperatures up to 125°C Design
The GRAS 146AE is a high-performance 1/2” Constant Current Power (CCP) free-field rugged microphone set. As a CCP type microphone set it ensures simple cabling and stable connection setup, reducing costs. CCP connection standard is at the same time interchangeable with accelerometers and pressure sensors, giving a low multi-channel cost for combined Automotive and NVH testing. The microphone set is designed to be extraordinarily robust against strong vibrations, shock, drop, high temperatures and wet or dusty conditions. Among the most important design features are the following: The microphone set is a tightly sealed unit, and all exposed parts are protected by a water and oil repellent coating. New methods and materials have been used for the interior of the microphone to improve its ability to absorb shock and vibrations, while the microphone housing is still made by the same well proven type of stainless steel that is used for our standard measurement microphones. The diaphragm is more robust than what is usually used in measurement microphones. This, in combination with the coating, makes it easier to clean the diaphragm without damaging it. The diaphragm can be replaced during repair, keeping repair cost to a minimum. The microphone grid is made from special materials and furnished with a coating, and especially robust to drop and scratches. New materials and mounting methods have been used for the preamplifier section, making it more resistant to being dropped repeatedly. The microphone has two venting holes, reducing the risk of water or oil drops from blocking the venting. The venting holes are protected by a unique filter, and the measurement set is IP67 rated. Together with a GRAS BNC coax cable with waterproof sealing, your whole measurement setup is IP67 rated. The ruggedness of the basic microphone set is further enhanced by the replaceable, special shock absorbing protection grid with an integrated filter that protects against oil, moisture, dirt and high-velocity particles. 146AE is a free-field microphone. If you need to use it in a random incidence sound field, the RA0357 Random Incidence Corrector will change the response up to 10 kHz to diffuse field. Read more here. Replaceable Grid with Enhanced Protection
Shock Protection
The 146AE has a two-stage shock protection system. A special built-in shock absorber prevents minor and medium shock impacts from damaging the microphone. If subjected to a high impact shock, the protection grid will absorb the shock by deforming. The grid is scratch resistant and comes with protective coating. The grid has a slightly larger diameter than the grids used on standard microphone sets like the GRAS 46AE, and therefore a dedicated calibration adapter is required. This adapter is part of the delivery. Dust and Water Resistant Filter
The grid has an integrated filter that is made from an acoustically transparent mesh. This mesh offers protection against dust, dirt and high-velocity particles. It is water and oil repellant while remaining acoustically transparent. This filter protects the microphone in environments where very high humidity or direct water spray is present. It also protects against condensing. The filter is IP55 rated. Comprehensive Mounting Options
The 146AE comes with adapters for GoPro™ mounting. In this way you get a vast variety of mounting options using widely accepted mounting methods, e.g. Picatinny. Low Cost of Ownership
The comprehensive precautions we have taken to make the 146AE immune to adverse test conditions result in a number of benefits that all translate into low costs of ownership. The total life span of the microphone set will be many times that of a conventional microphone set that must be discarded due to damage from dirt, moisture, shock and vibrations. The same microphone set can remain mounted in a test configuration for extended periods of time. Separate test results are immediately comparable because the same stable microphones are used. The protection grid with its protective filters can easily be replaced, for example before dirt and oil fog are clogging the meshes. The CCP (Constant Current Power) technology allows for low cost per measurement channel. Combining these advantages you will obtain a lower cost of ownership, while at the same time enjoying the accuracy and stability of a laboratory microphone. This is also due to lower failure rates and improved productivity due to easier handling and control of your measurement setup. Compatibility
The 146AE conforms to IEC61094-4/WS2F, it is terminated with a BNC connector and requires a constant current of 2 mA. Ready to use standard coax cable assemblies of various types and lengths or waterproof, heat and chemical resistant cables are available. The 146AE is IEEE 1451.4 TEDS v. 1.0 compliant. If your measurement platform supports Transducer Electronic Data Sheets you will be able to read and write data like properties and calibration data. System Verification
The integrated PowerOn indication and the functionality of TEDS are very useful to determine which microphone is connected to which input channel. However, it is not a check of whether the microphone is within specifications or not. For daily verification and check of your measurement setup, we recommend using a sound source like the GRAS 42AG Multifunction Sound Calibrator with the calibration adapter that is part of the delivery. For proper sensitivity calibration we recommend using a reference sound source like the GRAS 42AP Intelligent Pistonphone. Calibration Data
Calibration Data for each individual microphone set can be accessed online via the serial number. In this way, you can easily download and configure your analyzer with calibration data. Accessible on-line are also correction data for the protective grid in a format that your analyzer can read at GRAS HALT
When our R&D team develops a measurement microphone, it must undergo the most demanding tests to prove that it can withstand our customers' daily test conditions. Using a series of Highly Accelerated Lifetime Tests (HALT) 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. By stress testing to the limits we have been able to optimize the design for robustness and stability. Service, Warranty and Repair
When leaving the factory, all GRAS microphones have been calibrated in a controlled laboratory environment using traceable calibration equipment. Depending on the use, measurement environment and internal quality control programs we recommend that the microphone is recalibrated at least once a year. We offer two kinds of calibration as an optional after-sales service: GRAS Traceable Calibration and GRAS Accredited Calibration. GRAS Traceable Calibration is a traceable calibration performed by trained personnel under controlled conditions according to established procedures and standards. This is identical to the rigorous calibration that all GRAS microphones are subjected to as an integral part of our quality assurance. GRAS Accredited Calibration is performed by the GRAS Accredited Calibration Laboratory that has been accredited in accordance with ISO 17025 by DANAK, the Danish Accreditation Fund. If you want a new microphone set delivered with an accredited calibration instead of the default factory calibration, specify this when ordering. All parts are manufactured and assembled at the factory in Denmark by skilled and dedicated operators in a verified clean-room environment. Thanks to the high quality, our warranty against defective materials and workmanship is 5 years.
典型應用與使用
該146AE是一個(gè)自由場(chǎng)麥克風(fēng)集設計用于惡劣條件下，如NVH測試在汽車(chē)行業(yè)。
它是專(zhuān)門(mén)為應用程序設計的，例如：
發(fā)動(dòng)機噪聲振動(dòng)試驗
聲學(xué)性能測試
旁路噪聲測試
動(dòng)力傳動(dòng)系噪聲
計算機模型驗證/ CAE驗證
加速壽命周期試驗
室內噪音（屋頂、空調、吱吱聲和撥浪鼓）
娛樂(lè )與通信，語(yǔ)音控制
車(chē)輛部件評估和認證（制動(dòng)、輪胎、排氣）
測試溫度高達125°C
設計
GRAS 146AE是一種高性能的1/2“恒流電源（CCP）自由場(chǎng)堅固的麥克風(fēng)組）。作為CCP型麥克風(fēng)組，它確保了簡(jiǎn)單的布線(xiàn)和穩定的連接設置，降低了成本。CCP連接標準同時(shí)與加速度計和壓力傳感器互換，給組合式汽車(chē)和NVH測試帶來(lái)低的多通道成本。
麥克風(fēng)組被設計成在強振動(dòng)、沖擊、跌落、高溫和潮濕或灰塵條件下非常堅固。其中重要的設計特點(diǎn)如下：
麥克風(fēng)組是一個(gè)緊密密封的單元，所有暴露的部分都由防水拒油涂層保護。
新的方法和材料已被用于麥克風(fēng)內部，以提高其吸收沖擊和振動(dòng)的能力，而麥克風(fēng)外殼仍然是由同樣良好證明的不銹鋼類(lèi)型，用于我們的標準測量麥克風(fēng)。 隔膜比通常在測量麥克風(fēng)中使用的更堅固。這與涂層結合在一起，可以更容易地清洗隔膜而不會(huì )損壞隔膜。隔膜可以在修理過(guò)程中更換，將維修費用保持在低限度。 麥克風(fēng)格柵由特殊材料制成，并配有涂層，尤其對跌落和劃痕具有魯棒性。
新的材料和安裝方法已被用于前置放大器部分，使其更耐反復下降。 麥克風(fēng)有兩個(gè)排氣孔，減少了水或油滴堵塞排氣的風(fēng)險。通風(fēng)孔由*的過(guò)濾器保護，測量裝置為IP67額定值。
與GRAS BNC同軸電纜防水密封一起，您的整個(gè)測量設置IP67額定值。
基本的麥克風(fēng)組的堅固性通過(guò)可更換的、特殊的防沖擊保護柵格進(jìn)一步增強，其具有防止油、濕氣、污垢和高速顆粒的集成過(guò)濾器。 146AE是一個(gè)自由場(chǎng)麥克風(fēng)。如果需要在隨機入射聲場(chǎng)中使用它，RA0357隨機入射校正器將改變響應至10 kHz到擴散場(chǎng)。在這里閱讀更多。 具有增強保護功能的可更換網(wǎng)格
沖擊防護
146AE有兩級防震系統。一個(gè)特殊的內置減震器，防止輕微和中等沖擊影響麥克風(fēng)損壞。如果受到高沖擊沖擊，保護柵將通過(guò)變形吸收沖擊。 格柵抗劃傷，并配有保護涂層。
網(wǎng)格的直徑比GRAS46AE標準麥克風(fēng)組使用的網(wǎng)格稍大，因此需要的校準適配器。此適配器是交付的一部分。 防塵濾水器
網(wǎng)格有一個(gè)集成的過(guò)濾器，是由一個(gè)聲學(xué)透明網(wǎng)格。這個(gè)網(wǎng)格提供保護灰塵，污垢和高速粒子。它是防水和拒油，同時(shí)保持聲學(xué)透明。該過(guò)濾器保護麥克風(fēng)在非常高濕度或直接噴水的環(huán)境中存在。它還能防止冷凝。該過(guò)濾器為IP55額定值。 綜合安裝選項
146AE配有Gopro安裝的適配器。通過(guò)這種方式，您可以使用廣泛接受的安裝方法，例如Picatinny，獲得各種各樣的安裝選項。 低所有制成本
我們采取的綜合措施，使146AE免疫不利的測試條件，導致一些好處，所有轉化為低成本的所有權。麥克風(fēng)組的總壽命將是傳統麥克風(fēng)組的許多倍，這是由于污垢、濕氣、沖擊和振動(dòng)造成的損壞而必須丟棄的。
相同的麥克風(fēng)組可以在測試配置中保持較長(cháng)時(shí)間的安裝。
單獨的測試結果是可比的，因為使用相同的穩定麥克風(fēng)。
具有保護過(guò)濾器的保護網(wǎng)可以很容易地被替換，例如在污垢和油霧堵塞網(wǎng)格之前。 CCP（恒流功率）技術(shù)允許每個(gè)測量通道的低成本。
結合這些優(yōu)勢，您將獲得較低的擁有成本，同時(shí)享受實(shí)驗室麥克風(fēng)的準確性和穩定性。這也是由于較低的故障率和改進(jìn)的生產(chǎn)率，因為更容易處理和控制您的測量設置。 兼容性
146AE符合IEC61094-4/WS2F，它用BNC連接器終止，并且需要恒定電流2毫安。
可使用各種類(lèi)型和長(cháng)度的標準同軸電纜組件或防水、耐熱和耐化學(xué)電纜。
146AE是IEEE 1451.4 TEDS V 1兼容。如果您的測量平臺支持換能器電子數據表，您將能夠讀取和寫(xiě)入數據，如屬性和校準數據。 系統驗證
集成的POWER指示和TEDS的功能對于確定哪一個(gè)麥克風(fēng)連接到哪個(gè)輸入通道是非常有用的。然而，它不是檢查麥克風(fēng)是否在規格之內。
為了日常驗證和檢查您的測量設置，我們建議使用GRAS42AG多功能聲音校準器的聲音源與校準適配器，這是交付的一部分。對于適當的靈敏度校準，我們建議使用參考聲源，如GRAS 42AP智能活塞式。 校準數據
每個(gè)單獨的麥克風(fēng)組的校準數據可以通過(guò)序列號在線(xiàn)訪(fǎng)問(wèn)。通過(guò)這種方式，您可以輕松地下載和配置具有校準數據的分析器。
可訪(fǎng)問(wèn)在線(xiàn)也是保護網(wǎng)格的校正數據，您的分析器可以數據中讀取該格式。 格拉斯停頓
當我們的研發(fā)團隊開(kāi)發(fā)一個(gè)測量麥克風(fēng)時(shí)，必須經(jīng)過(guò)苛刻的測試才能證明它能夠經(jīng)受住我們客戶(hù)每天的測試條件。使用一系列高加速壽命試驗（HALT），我們確保我們的麥克風(fēng)達到我們客戶(hù)期望和信任的高質(zhì)量和高精度。我們的停止測試通過(guò)模擬處理和使用它在現實(shí)生活中暴露出來(lái)，積極地加速麥克風(fēng)的壽命。通過(guò)對極限的應力測試，我們已經(jīng)能夠優(yōu)化設計的魯棒性和穩定性。 服務(wù)、保修和維修
離開(kāi)工廠(chǎng)時(shí)，所有的GRAS麥克風(fēng)都在可控實(shí)驗室環(huán)境中使用可追溯校準設備進(jìn)行校準。根據使用情況、測量環(huán)境和內部質(zhì)量控制程序，我們建議每年至少重新校準一次麥克風(fēng)。 我們提供兩種校準作為一種可選的售后服務(wù)：GRAS溯源校準和GRAS認證校準。
GRAS溯源校準是根據既定程序和標準在受控條件下由受過(guò)訓練的人員進(jìn)行的可追溯校準。這是嚴格的校準，所有的GRAS麥克風(fēng)作為我們的質(zhì)量保證的一個(gè)組成部分。GRAS認可的校準是由丹麥認可基金DAAK認可的GRAS認可校準實(shí)驗室進(jìn)行的。如果你想要一個(gè)新的麥克風(fēng)設置與認證的校準，而不是默認的工廠(chǎng)校準，請在訂購時(shí)。 所有部件都是在丹麥工廠(chǎng)制造和組裝的，由熟練的和專(zhuān)門(mén)的操作員在一個(gè)經(jīng)過(guò)驗證的潔凈室環(huán)境中。
由于質(zhì)量好，我們對有缺陷的材料和工藝的保修期為5年。
GRAS 146AE 1/2'' CCP Free-field Rugged Microphone Set
設計用于實(shí)際生活條件
146AE是世界上個(gè)堅固耐用的CCP麥克風(fēng)，專(zhuān)門(mén)設計用于在現實(shí)生活中遇到的惡劣環(huán)境和條件下可靠地工作，如強振動(dòng)、沖擊、跌落、溫度和潮濕或灰塵條件。
146AE的堅固設計使得在同一汽車(chē)測試裝置中僅使用單一類(lèi)型的麥克風(fēng)執行許多不同類(lèi)型的測量成為可能。這不僅提高了你的NVH測試性能和數據質(zhì)量在崎嶇的條件下，它也延長(cháng)了你的測量設置的壽命。沒(méi)有必要重復昂貴且耗時(shí)的測試，同時(shí)提供、有效的數據和高性能。
頻率范圍：3.15赫茲至20千赫
DYN范圍：18分貝（A）至138分貝
靈敏度：50 mV/Pa
溫度：-40至+125°C
濕度：0—95%
IP67
146AE是一種堅固耐用的自由場(chǎng)麥克風(fēng)，適用于所有聲學(xué)應用，其中麥克風(fēng)可以直接指向聲源。它被優(yōu)化用于惡劣環(huán)境中的溫度從40℃到125℃。
技術(shù)
介紹
GRAS 146AE是一種堅固的麥克風(fēng)，專(zhuān)門(mén)用于汽車(chē)測試等惡劣環(huán)境。它結合了實(shí)驗室麥克風(fēng)的高精度和穩定性，具有的堅固性，即在惡劣條件下工作，例如沖擊、高溫、潮濕、水噴霧、油霧和灰塵。
汽車(chē)測試的新范式
隨著(zhù)IEC 61094-4/WS2F測量麥克風(fēng)和堅固性結合在一個(gè)麥克風(fēng)中的精度，現在可以使用先進(jìn)的麥克風(fēng)，即使在惡劣的條件下，也能在較長(cháng)的時(shí)間內提供質(zhì)量和穩定性的優(yōu)點(diǎn)。
您可以在不必更換麥克風(fēng)的情況下進(jìn)行關(guān)鍵的質(zhì)量測量，這樣可以增強測量的信心，同時(shí)大限度地減少停機時(shí)間和維護成本。不必重新配置測量設置，降低了成本，使測量容易類(lèi)似。 這種麥克風(fēng)是專(zhuān)門(mén)設計的，以抵抗振動(dòng)，沖擊和跌落，并在惡劣的條件下產(chǎn)生和可重復的測量。測試夾具、電纜和附件確保容易定位和操作。
一個(gè)集成的POWER LED指示顯示當麥克風(fēng)連接和準備測量。如果有錯誤的連接，LED不會(huì )在上電時(shí)被點(diǎn)亮。后，當TEDS芯片被讀取時(shí)，它會(huì )亮起來(lái)。這個(gè)特性使它可以運行一個(gè)完整的“我們準備好測量了嗎？”通過(guò)連續激活他們的TEDS測試所有連接麥克風(fēng)。
146AE為IP67額定值。所有裸露部位均采用拒水拒油涂層保護，清洗方便。涂層能承受熱量和化學(xué)物質(zhì)。
除了麥克風(fēng)裝置、污垢和濕氣的基本彈性之外，還有一個(gè)可更換的保護柵，包括水和灰塵過(guò)濾器，增加了額外的柔性保護層，包括對高速粒子的保護。這使得麥克風(fēng)特別適合于高濕度、濺油或戶(hù)外測量條件。簡(jiǎn)單地更換過(guò)濾器網(wǎng)格組件將增加麥克風(fēng)組可以安裝在相同的測試配置中的時(shí)間。
146AE具有與標準測量麥克風(fēng)一樣的低溫系數，例如GRAS 46AE，但能夠承受溫度從-40到125°C的暴露，對其靈敏度沒(méi)有變化
綜合測試
停頓
在GRAS中，我們知道為了讓你相信你的測量結果，信號質(zhì)量、穩定性和健壯性是*的。因為我們也知道你如何處理和使用麥克風(fēng)在日常工作中，我們進(jìn)行了一系列的高加速壽命測試（HALT），以確保它們在真實(shí)的生活條件下進(jìn)行。
對于新的堅固的麥克風(fēng)線(xiàn)路，我們使我們的停機更具挑戰性，以反映惡劣的環(huán)境和條件下的NVH測量。在8℃下振動(dòng)60小時(shí)，保持在40℃至125°C的溫度，從硬表面150厘米水平和垂直地下降，并通過(guò)一次跌倒試驗，在地板上隨機下降100厘米100次。
IP67認證
此外，146AE是認證的水和防塵（IP67）。
丹麥GRAS麥克風(fēng)146AE安裝校準指導 Gras 46BE
Gras OP0040
Gras OP0041
Gras OP0030
Gras OP0031
Gras OP0032
Gras OP0050
Gras OP0051
Gras OP0070
Gras 44AA
Gras 44AB
Gras OP0045
Gras OP0046
Gras 43AH
Gras 43AI
Gras AA0032
Gras AA0033
Gras AA0034
Gras AA0035
Gras AA0070
Gras AA0073-CL
Gras 12AL
Gras 12AX
Gras 42AG
Gras 42AP
Gras 46BP-1
Gras 46DP-1
Gras 46BH-1 | 
