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GRAS麥克風(fēng)46AM 1/2'' CCP頻率范圍和動(dòng)態(tài)范圍
GRAS麥克風(fēng)  GRAS放大器  GRAS風(fēng)球  GRAS*  GRAS控制器   GRAS防風(fēng)球
出廠時(shí)，所有GRAS話筒均已在受控實(shí)驗(yàn)室環(huán)境中使用可追蹤校準(zhǔn)設(shè)備進(jìn)行校準(zhǔn)。根據(jù)使用、測(cè)量環(huán)境和內(nèi)部質(zhì)量控制程序，我們建議至少每年對(duì)麥克風(fēng)進(jìn)行一次重新校準(zhǔn)。
我們提供兩種校準(zhǔn)作為可選的售后服務(wù)：GRAS可追蹤校準(zhǔn)和GRAS認(rèn)證校準(zhǔn)。
GRAS可追溯校準(zhǔn)是由受過(guò)培訓(xùn)的人員在受控條件下根據(jù)既定程序和標(biāo)準(zhǔn)進(jìn)行的可追溯校準(zhǔn)。這與所有GRAS話筒作為我們質(zhì)量保證的一個(gè)組成部分進(jìn)行的嚴(yán)格校準(zhǔn)相同。
GRAS認(rèn)證校準(zhǔn)由GRAS認(rèn)證校準(zhǔn)實(shí)驗(yàn)室執(zhí)行，該實(shí)驗(yàn)室已根據(jù)丹麥認(rèn)證基金Danak的ISO 17025認(rèn)證。

技術(shù)介紹
通過(guò)與客戶的密切合作，我們知道數(shù)據(jù)安全非常重要，因?yàn)榕c不合適和不可靠的傳感器相關(guān)的成本可能決定您的項(xiàng)目是否成功。
對(duì)于我們的用戶來(lái)說(shuō)，數(shù)據(jù)安全直接轉(zhuǎn)化為要求更容易的麥克風(fēng)選擇，簡(jiǎn)單的系統(tǒng)配置和減少測(cè)量誤差。
為了滿足這些要求，我們發(fā)明了麥克風(fēng)組的概念。它簡(jiǎn)單、可靠、堅(jiān)固，由麥克風(fēng)盒和前置放大器組合而成，作為一個(gè)單元進(jìn)行校準(zhǔn)。這消除了錯(cuò)誤，因?yàn)橹挥幸粋€(gè)敏感度值需要考慮，并且消除了污染接口的風(fēng)險(xiǎn)。結(jié)合我們*且經(jīng)驗(yàn)證的設(shè)計(jì)，您將擁有當(dāng)今業(yè)內(nèi)可靠的測(cè)量話筒套件。
典型應(yīng)用和使用
46AM是一個(gè)自由場(chǎng)麥克風(fēng)組，因此針對(duì)所有聲學(xué)應(yīng)用進(jìn)行了優(yōu)化，在這些應(yīng)用中，主聲源的位置是已知的，麥克風(fēng)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(xué)測(cè)量的理想選擇。
關(guān)于溫度范圍，請(qǐng)參見(jiàn)規(guī)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(shè)計(jì)
GRAS 46AM是一款高性能1/2“自由場(chǎng)標(biāo)準(zhǔn)話筒，用于測(cè)量各種頻率下的中等聲壓級(jí)。在我們的潔凈室環(huán)境中，這套設(shè)備是用標(biāo)簽組裝和密封的。但是，如果您希望單獨(dú)使用這些組件，則可以卸下麥克風(fēng)組。
話筒
麥克風(fēng)盒是高質(zhì)量的IEC 61094 WS3F標(biāo)準(zhǔn)化GRAS 40AM 1/2“預(yù)極化自由場(chǎng)麥克風(fēng)，設(shè)計(jì)用于多種環(huán)境下的長(zhǎng)期可靠性。
預(yù)極化是通過(guò)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(duì)駐極體充電，以匹配的麥克風(fēng)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(biāo)準(zhǔn)前置放大器，帶BNC連接器，基于我們的電路板基板。在工業(yè)上，它們以其低噪聲、寬頻率和優(yōu)良的回轉(zhuǎn)率性能而聞名。
兼容性
為了按照規(guī)定執(zhí)行，GRAS 46DD話筒組需要一個(gè)恒流輸入模塊，該模塊可提供4 mA和24 V無(wú)負(fù)載CCP電壓電源。如果恒流電源較低，則會(huì)降低長(zhǎng)電纜的驅(qū)動(dòng)能力，從而降低較高的頻率。如果電源電壓較低，則會(huì)影響較高的動(dòng)態(tài)范圍。
話筒組端接10/32 microdot母接頭。各種類(lèi)型和長(zhǎng)度的現(xiàn)成同軸電纜組件可提供標(biāo)準(zhǔn)長(zhǎng)度和定制長(zhǎng)度。
46DD符合IEEE 1451.4 TEDS v.1.0標(biāo)準(zhǔn)。如果您的測(cè)量平臺(tái)支持傳感器電子數(shù)據(jù)表，您將能夠讀寫(xiě)數(shù)據(jù)，如屬性和校準(zhǔn)數(shù)據(jù)。

系統(tǒng)驗(yàn)證
TEDS的功能對(duì)于確定哪個(gè)麥克風(fēng)連接到哪個(gè)輸入通道非常有用。但是，這不是檢查麥克風(fēng)是否符合規(guī)格。因此，對(duì)于測(cè)量設(shè)置的日常驗(yàn)證和檢查，我們建議使用像GRAS 42AG聲音校準(zhǔn)器這樣的聲源。
為了正確進(jìn)行靈敏度校準(zhǔn)，我們建議使用參考聲源，如GRAS 42AP智能槍。
服務(wù)
如果您錯(cuò)誤地?fù)p壞了GRAS話筒上的振膜，在大多數(shù)情況下，我們可以以非常合理的成本和較短的周轉(zhuǎn)時(shí)間更換振膜。這不僅可以保護(hù)您的投資，而且還可以滿足您的質(zhì)量保證部門(mén)，因?yàn)槟槐負(fù)?dān)心新的序列號(hào)等。
校準(zhǔn)
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(guī)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(yù)放大器動(dòng)態(tài)范圍下限
DB（A）
25
脂肪CCP預(yù)放大器動(dòng)態(tài)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(lái)
-37
輸出阻抗
奧爾
<50
輸出電壓搖擺，分鐘.@24-28 CCP電壓供應(yīng)
維生素
8
直流偏置電壓
v
12
傳聲器通風(fēng)
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(shù)
DB/C/DB/F
-0.01/-0.006
靜壓系數(shù)
DB/KPA
-0.014
濕度范圍
頁(yè)：1
0 to 90
濕度系數(shù)
DB/%RH
-0.001
軸向振動(dòng)的影響
DB RE 20微帕
66
Teds Utid（IEEE 1451.4）
27 V.1.0
連接器類(lèi)型
英國(guó)廣播公司
EC/Rohs compliant/Weee registered
是/是，是
GRAS46AM測(cè)量傳聲器  GRAS46AM測(cè)量傳聲器  GRAS46AM測(cè)量傳聲器
因?yàn)榕c不合適和不可靠的傳感器相關(guān)的成本可能決定您的項(xiàng)目是否成功。對(duì)于我們的用戶來(lái)說(shuō)，數(shù)據(jù)安全直接轉(zhuǎn)化為更容易選擇麥克風(fēng)、簡(jiǎn)單的系統(tǒng)配置和減少測(cè)量誤差的要求。因?yàn)榕c不合適和不可靠的傳感器相關(guān)的成本可能決定您的項(xiàng)目是否成功。對(duì)于我們的用戶來(lái)說(shuō)，數(shù)據(jù)安全直接轉(zhuǎn)化為更容易選擇麥克風(fēng)、簡(jiǎn)單的系統(tǒng)配置和減少測(cè)量誤差的要求。
GRAS 46AM是一款高性能1/2“自由場(chǎng)標(biāo)準(zhǔn)話筒，用于測(cè)量各種頻率下的中等聲壓級(jí)。在我們的潔凈室環(huán)境中，這套設(shè)備是用標(biāo)簽組裝和密封的。但是，如果您希望單獨(dú)使用這些組件，則可以卸下麥克風(fēng)組。
話筒
麥克風(fēng)盒是高質(zhì)量的IEC 61094 WS3F標(biāo)準(zhǔn)化GRAS 40AM 1/2“預(yù)極化自由場(chǎng)麥克風(fēng)，設(shè)計(jì)用于多種環(huán)境下的長(zhǎng)期可靠性。
預(yù)極化是通過(guò)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(duì)駐極體充電，以匹配的麥克風(fēng)靈敏度。
前置放大器
前置放大器是GRAS 26CA 1/2“CCP標(biāo)準(zhǔn)前置放大器，帶BNC連接器，基于我們的電路板基板。在工業(yè)上，它們以其低自噪聲、寬頻率和優(yōu)良的回轉(zhuǎn)率性能而聞名。
兼容性
為了按照規(guī)定執(zhí)行，GRAS 46DD話筒組需要一個(gè)恒流輸入模塊，該模塊可提供4 mA和24 V無(wú)負(fù)載CCP電壓電源。如果恒流電源較低，則會(huì)降低長(zhǎng)電纜的驅(qū)動(dòng)能力，從而降低較高的頻率。如果電源電壓較低，則會(huì)影響較高的動(dòng)態(tài)范圍。
話筒組端接10/32 microdot母接頭。各種類(lèi)型和長(zhǎng)度的現(xiàn)成同軸電纜組件可提供標(biāo)準(zhǔn)長(zhǎng)度和定制長(zhǎng)度。
46DD符合IEEE 1451.4 TEDS v.1.0標(biāo)準(zhǔn)。如果您的測(cè)量平臺(tái)支持傳感器電子數(shù)據(jù)表，您將能夠讀寫(xiě)數(shù)據(jù)，如屬性和校準(zhǔn)數(shù)據(jù)。
系統(tǒng)驗(yàn)
TEDS的功能對(duì)于確定哪個(gè)麥克風(fēng)連接到哪個(gè)輸入通道非常有用。但是，這不是檢查麥克風(fēng)是否符合規(guī)格。因此，對(duì)于測(cè)量設(shè)置的日常驗(yàn)證和檢查，我們建議使用像GRAS 42AG聲音校準(zhǔn)器這樣的聲源。
為了正確進(jìn)行靈敏度校準(zhǔn)，我們建議使用參考聲源，如GRAS 42AP智能。
服務(wù)
如果您錯(cuò)誤地?fù)p壞了GRAS話筒上的振膜，我們?cè)诖蠖鄶?shù)情況下都能以非常合理的成本和較短的周轉(zhuǎn)時(shí)間進(jìn)行更換。這不僅可以保護(hù)您的投資，而且還可以滿足您的質(zhì)量保證部門(mén)，因?yàn)槟槐負(fù)?dān)心新的序列號(hào)等。
校準(zhǔn)
出廠時(shí)，所有GRAS話筒均已在受控實(shí)驗(yàn)室環(huán)境中使用可追蹤校準(zhǔn)設(shè)備進(jìn)行校準(zhǔn)。根據(jù)使用、測(cè)量環(huán)境和內(nèi)部質(zhì)量控制程序，我們建議麥克風(fēng)至少每年重新校準(zhǔn)一次。
我們提供兩種校準(zhǔn)作為可選的售后服務(wù)：GRAS可追蹤校準(zhǔn)和GRAS認(rèn)證校準(zhǔn)。
GRAS可追溯校準(zhǔn)是由受過(guò)培訓(xùn)的人員在受控條件下根據(jù)既定程序和標(biāo)準(zhǔn)進(jìn)行的可追溯校準(zhǔn)。這與所有GRAS話筒作為我們質(zhì)量保證的一個(gè)組成部分進(jìn)行的嚴(yán)格校準(zhǔn)相同。
GRAS認(rèn)證校準(zhǔn)由GRAS認(rèn)證校準(zhǔn)實(shí)驗(yàn)室執(zhí)行，該實(shí)驗(yàn)室已根據(jù)丹麥認(rèn)證基金Danak的ISO 17025認(rèn)證。
如果您想要一個(gè)新的麥克風(fēng)套件，而不是默認(rèn)的出廠校準(zhǔn)，請(qǐng)?jiān)谟嗁?gòu)時(shí)。
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(chǎng)標(biāo)準(zhǔn)話筒組，寬頻
頻率范圍：3.15赫茲至31.5千赫
動(dòng)態(tài)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(xué)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(fēng)熱賣(mài)的型號(hào)：
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