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GRAS麥克風46AM 1/2'' CCP頻率范圍和動態范圍
GRAS麥克風  GRAS放大器  GRAS風球  GRAS*  GRAS控制器   GRAS防風球
出廠時，所有GRAS話筒均已在受控實驗室環境中使用可追蹤校準設備進行校準。根據使用、測量環境和內部質量控制程序，我們建議至少每年對麥克風進行一次重新校準。
我們提供兩種校準作為可選的售后服務：GRAS可追蹤校準和GRAS認證校準。
GRAS可追溯校準是由受過培訓的人員在受控條件下根據既定程序和標準進行的可追溯校準。這與所有GRAS話筒作為我們質量保證的一個組成部分進行的嚴格校準相同。
GRAS認證校準由GRAS認證校準實驗室執行，該實驗室已根據丹麥認證基金Danak的ISO 17025認證。

技術介紹
通過與客戶的密切合作，我們知道數據安全非常重要，因為與不合適和不可靠的傳感器相關的成本可能決定您的項目是否成功。
對于我們的用戶來說，數據安全直接轉化為要求更容易的麥克風選擇，簡單的系統配置和減少測量誤差。
為了滿足這些要求，我們發明了麥克風組的概念。它簡單、可靠、堅固，由麥克風盒和前置放大器組合而成，作為一個單元進行校準。這消除了錯誤，因為只有一個敏感度值需要考慮，并且消除了污染接口的風險。結合我們*且經驗證的設計，您將擁有當今業內可靠的測量話筒套件。
典型應用和使用
46AM是一個自由場麥克風組，因此針對所有聲學應用進行了優化，在這些應用中，主聲源的位置是已知的，麥克風可以直接指向它，確保0°的入射角。
中頻范圍使它成為一般聲學測量的理想選擇。
關于溫度范圍，請參見規格。如果需要更高的溫度限制，我們建議考慮GRAS探頭話筒，話筒和前置放大器可與熱源隔離。

設計
GRAS 46AM是一款高性能1/2“自由場標準話筒，用于測量各種頻率下的中等聲壓級。在我們的潔凈室環境中，這套設備是用標簽組裝和密封的。但是，如果您希望單獨使用這些組件，則可以卸下麥克風組。
話筒
麥克風盒是高質量的IEC 61094 WS3F標準化GRAS 40AM 1/2“預極化自由場麥克風，設計用于多種環境下的長期可靠性。
預極化是通過駐極體在高度受控的條件下施加在傳聲器背板上獲得的。然后對駐極體充電，以匹配的麥克風靈敏度。

Test conditions

Temperature: 20C

Pressure: 760mm

Typical frequency response. Upper curve shows free-fi eld response for 0°, lower curve shows pressure response.

Free-field corrections for different angles of incidence

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Dimensions

Ordering info

 Optional items

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

前置放大器
前置放大器是GRAS 26CA 1/2“CCP標準前置放大器，帶BNC連接器，基于我們的電路板基板。在工業上，它們以其低噪聲、寬頻率和優良的回轉率性能而聞名。
兼容性
為了按照規定執行，GRAS 46DD話筒組需要一個恒流輸入模塊，該模塊可提供4 mA和24 V無負載CCP電壓電源。如果恒流電源較低，則會降低長電纜的驅動能力，從而降低較高的頻率。如果電源電壓較低，則會影響較高的動態范圍。
話筒組端接10/32 microdot母接頭。各種類型和長度的現成同軸電纜組件可提供標準長度和定制長度。
46DD符合IEEE 1451.4 TEDS v.1.0標準。如果您的測量平臺支持傳感器電子數據表，您將能夠讀寫數據，如屬性和校準數據。

系統驗證
TEDS的功能對于確定哪個麥克風連接到哪個輸入通道非常有用。但是，這不是檢查麥克風是否符合規格。因此，對于測量設置的日常驗證和檢查，我們建議使用像GRAS 42AG聲音校準器這樣的聲源。
為了正確進行靈敏度校準，我們建議使用參考聲源，如GRAS 42AP智能槍。
服務
如果您錯誤地損壞了GRAS話筒上的振膜，在大多數情況下，我們可以以非常合理的成本和較短的周轉時間更換振膜。這不僅可以保護您的投資，而且還可以滿足您的質量保證部門，因為您不必擔心新的序列號等。
校準
Specifications
Polarization/Connection
0 V / CCP
Frequency range (±1 dB)
Hz
5 to 16 k
Frequency range (±2 dB)
Hz
3.15 to 31.5 k
Frequency range (±3 dB)
Hz
3.15 to 40 k
Dynamic range lower limit with GRAS preamplifier
dB(A)
25
Dynamic range upper limit with GRAS CCP preamplifier
dB
149
Set sensitivity @ 250 Hz (±2 dB)
mV/Pa
14.5
Set sensitivity @ 250 Hz (±2 dB)
dB re 1V/Pa
- 37
Output impedance
Ω
<50
Output Voltage Swing, min. @ 24-28 V CCP voltage supply
Vp
8
DC bias voltage, typ.
V
12
Microphone venting
Rear
IEC 61094-4 Compliance
WS2F
Temperature range, operation
°C / °F
-30 to 70 / -22 to 158
Temperature range, storage
°C / °F
- 40 to 85 / - 40 to 185
Temperature coefficient @250 Hz
dB/°C / dB/°F
-0.01 / -0.006
Static pressure coefficient @250 Hz
dB/kPa
- 0.014
Humidity range non condensing
% RH
0 to 90
Humidity coefficient @250 Hz
dB/% RH
- 0.001
Influence of axial vibration @1 m/s?
dB re 20 ?Pa
66
TEDS UTID (IEEE 1451.4)
27 v. 1.0
Connector type
BNC
CE/RoHS compliant/WEEE registered
Yes / Yes, Yes
規格
極化/連接
0 V/CCP
頻率范圍（±1 db）
赫茲
5-16 K
頻率范圍（±2 db）
赫茲
3.15-31.5 k
頻率范圍（±3 db）
赫茲
3.15-40 K
脂肪預放大器動態范圍下限
DB（A）
25
脂肪CCP預放大器動態范圍上限
DB
149
set靈敏度@250hz（±2 db）
MV/PA
14.5
set靈敏度@250hz（±2 db）
次來
-37
輸出阻抗
奧爾
<50
輸出電壓搖擺，分鐘.@24-28 CCP電壓供應
維生素
8
直流偏置電壓
v
12
傳聲器通風
雷爾
IEC 61094-4 compliance
WS2F
操作溫度范圍
攝氏度
-30 to 70/-22 to 158
溫度范圍
攝氏度
-40 to 85/-40 to 185
溫度系數
DB/C/DB/F
-0.01/-0.006
靜壓系數
DB/KPA
-0.014
濕度范圍
頁：1
0 to 90
濕度系數
DB/%RH
-0.001
軸向振動的影響
DB RE 20微帕
66
Teds Utid（IEEE 1451.4）
27 V.1.0
連接器類型
英國廣播公司
EC/Rohs compliant/Weee registered
是/是，是
GRAS46AM測量傳聲器  GRAS46AM測量傳聲器  GRAS46AM測量傳聲器
因為與不合適和不可靠的傳感器相關的成本可能決定您的項目是否成功。對于我們的用戶來說，數據安全直接轉化為更容易選擇麥克風、簡單的系統配置和減少測量誤差的要求。因為與不合適和不可靠的傳感器相關的成本可能決定您的項目是否成功。對于我們的用戶來說，數據安全直接轉化為更容易選擇麥克風、簡單的系統配置和減少測量誤差的要求。
GRAS 46AM是一款高性能1/2“自由場標準話筒，用于測量各種頻率下的中等聲壓級。在我們的潔凈室環境中，這套設備是用標簽組裝和密封的。但是，如果您希望單獨使用這些組件，則可以卸下麥克風組。
話筒
麥克風盒是高質量的IEC 61094 WS3F標準化GRAS 40AM 1/2“預極化自由場麥克風，設計用于多種環境下的長期可靠性。
預極化是通過駐極體在高度受控的條件下施加在傳聲器背板上獲得的。然后對駐極體充電，以匹配的麥克風靈敏度。
前置放大器
前置放大器是GRAS 26CA 1/2“CCP標準前置放大器，帶BNC連接器，基于我們的電路板基板。在工業上，它們以其低自噪聲、寬頻率和優良的回轉率性能而聞名。
兼容性
為了按照規定執行，GRAS 46DD話筒組需要一個恒流輸入模塊，該模塊可提供4 mA和24 V無負載CCP電壓電源。如果恒流電源較低，則會降低長電纜的驅動能力，從而降低較高的頻率。如果電源電壓較低，則會影響較高的動態范圍。
話筒組端接10/32 microdot母接頭。各種類型和長度的現成同軸電纜組件可提供標準長度和定制長度。
46DD符合IEEE 1451.4 TEDS v.1.0標準。如果您的測量平臺支持傳感器電子數據表，您將能夠讀寫數據，如屬性和校準數據。
系統驗
TEDS的功能對于確定哪個麥克風連接到哪個輸入通道非常有用。但是，這不是檢查麥克風是否符合規格。因此，對于測量設置的日常驗證和檢查，我們建議使用像GRAS 42AG聲音校準器這樣的聲源。
為了正確進行靈敏度校準，我們建議使用參考聲源，如GRAS 42AP智能。
服務
如果您錯誤地損壞了GRAS話筒上的振膜，我們在大多數情況下都能以非常合理的成本和較短的周轉時間進行更換。這不僅可以保護您的投資，而且還可以滿足您的質量保證部門，因為您不必擔心新的序列號等。
校準
出廠時，所有GRAS話筒均已在受控實驗室環境中使用可追蹤校準設備進行校準。根據使用、測量環境和內部質量控制程序，我們建議麥克風至少每年重新校準一次。
我們提供兩種校準作為可選的售后服務：GRAS可追蹤校準和GRAS認證校準。
GRAS可追溯校準是由受過培訓的人員在受控條件下根據既定程序和標準進行的可追溯校準。這與所有GRAS話筒作為我們質量保證的一個組成部分進行的嚴格校準相同。
GRAS認證校準由GRAS認證校準實驗室執行，該實驗室已根據丹麥認證基金Danak的ISO 17025認證。
如果您想要一個新的麥克風套件，而不是默認的出廠校準，請在訂購時。
GRAS 46AM 1/2'' CCP Free-field Standard Microphone Set, Wide Frequency
Freq range: 3.15 Hz to 31.5 kHz
Dyn range: 25 dB(A) to 149 dB
Sensitivity: 14.5 mV/Pa
Use: For general acoustic diagnostics
GRAS 46AM 1/2''CCP自由場標準話筒組，寬頻
頻率范圍：3.15赫茲至31.5千赫
動態范圍：25分貝（A）到149分貝
靈敏度：14.5 mV/pa
用途：用于一般聲學診斷
Technology
Introduction
Through a close cooperation with our customers, we know that data-safety is highly important because the costs related to unsuited and unreliable sensors may determine whether your project turns into a success or not.
For our users, data safety translates directly into requests for easier microphone selection, simple system configuration and reduction of measurement errors.
To meet these requirements, we invented the microphone set concept. It is simple, reliable and robust and consists of a microphone cartridge and preamplifier combination, which is calibrated as one unit. This eliminates errors because there is only one sensitivity value to account for and the risk of contaminating the interface is eliminated. Combine this with our unique and proven design and you have the most reliable measurement microphone sets available in the industry today.
Typical applications and use
The 46AM is a free-field microphone set and as such optimized for all acoustic applications, where the location of the main sound source is known and the microphone can be pointed directly at it ensuring 0° incidence.
The medium frequency range makes it ideal for general acoustic measurements.
Regarding temperature range, see the Specifications. Should higher temperature limits be required, we recommend considering  the GRAS probe microphones where the microphone and preamplifier can be isolated from the hot source.
Design
The GRAS 46AM is a high-performance 1/2” free-field standard microphone set for measuring medium sound pressure levels at a wide range of frequencies. In our clean-room environment the set is assembled and sealed with a label. However, the microphone set can be dismounted, if  you wish to use the components separately.
Microphone
The microphone cartridge is the high-quality IEC  61094 WS3F standardized GRAS 40AM 1/2” Prepolarized Free-Field Microphone, designed for long-term reliability in multiple environments.
The prepolarization is obtained through an electret that is inflicted on the microphone back-plate under highly controlled conditions. The electret is then charged to match the specified microphone sensitivity.
Preamplifier
The preamplifier is the GRAS 26CA 1/2” CCP Standard Preamplifier with BNC connector, and based on our well-known circuit board substrates. In the industry these are famous for their low self-noise, wide frequency and excellent slew rate performance.
Compatibility
To perform as specified the GRAS 46DD microphone set requires a constant current input module that can deliver 4 mA and 24 V unloaded CCP voltage supply. If the constant current supply is lower, the capability of driving long cables is reduced and consequently the upper frequency is reduced. If the voltage supply is lower it will influence the upper dynamic range.
The microphone set is terminated with a 10/32 Microdot female connector. Ready to use coax cable assemblies of various types and lengths are available in standard as well as customized lengths.
The 46DD 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 functionality of TEDS is 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 therefore recommend using a sound source like the GRAS 42AG Sound Calibrator.
For proper sensitivity calibration we recommend using a reference sound source like the GRAS 42AP Intelligent Pistonphone.
Service
Should you by mistake damage the diaphragm on a GRAS microphone we will in most cases be able to exchange it at a very reasonable cost and short turn-around time. This not only protects your investment but also meets your quality assurance department since you do not have to worry about new serial numbers etc.
Calibration
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 in stead of the default factory calibration, specify this when ordering.
Learn more at gras/calib.
Quality and warranty
GRAS microphone sets are made of components from our proven standard portfolio and are all manufactured of high-quality material and branded parts that were chosen and processed to ensure life-long stability and robustness.
All parts are manufactured and assembled at the factory in Denmark by skilled and dedicated operators in a verified clean-room environment. The microphone diaphragm, body and unique protection grid are made of high-grade stainless steel and make the microphone set resistant to physical damage as well as corrosion caused by aggressive air or gasses.
This, together with the enforced gold-plated microphone terminal guarantees a highly reliable connection. Thanks to the high quality, our warranty against defective materials and workmanship is 5 years.
在GRAS/Calib了解更多信息。
GRAS麥克風熱賣的型號：
GRAS 46AG
GRAS 26CA
GRAS 146AE
GRAS 46AD
GRAS 46AE
GRAS 46AF
GRAS 46AM
GRAS 46AO
GRAS 46AQ
GRAS 46AZ
GRAS 46BD
GRAS 46BD-FV
GRAS 46BD-S1
GRAS 46BE
GRAS 46BG
GRAS 46BG-FV
GRAS 46BG
GRAS 46BH