GRAS麦克风46AM 1/2'' CCP频率范围和动态范围
GRAS麦克风  GRAS放大器  GRAS风球  GRAS*  GRAS控制器   GRAS防风球
出厂时，所有GRAS话筒均已在受控实验室环境中使用可追踪校准设备进行校准。根据使用、测量环境和内部质量控制程序，我们建议至少每年对麦克风进行一次重新校准。
我们提供两种校准作为可选的售后服务：GRAS可追踪校准和GRAS认证校准。
GRAS可追溯校准是由受过培训的人员在受控条件下根据既定程序和标准进行的可追溯校准。这与所有GRAS话筒作为我们质量保证的一个组成部分进行的严格校准相同。
GRAS认证校准由GRAS认证校准实验室执行，该实验室已根据丹麦认证基金Danak的ISO 17025认证。

技术介绍
通过与客户的密切合作，我们知道数据安全非常重要，因为与不合适和不可靠的传感器相关的成本可能决定您的项目是否成功。
对于我们的用户来说，数据安全直接转化为要求更容易的麦克风选择，简单的系统配置和减少测量误差。
为了满足这些要求，我们发明了麦克风组的概念。它简单、可靠、坚固，由麦克风盒和前置放大器组合而成，作为一个单元进行校准。这消除了错误，因为只有一个敏感度值需要考虑，并且消除了污染接口的风险。结合我们*且经验证的设计，您将拥有当今业内可靠的测量话筒套件。
典型应用和使用
46AM是一个自由场麦克风组，因此针对所有声学应用进行了优化，在这些应用中，主声源的位置是已知的，麦克风可以直接指向它，确保0°的入射角。
中频范围使它成为一般声学测量的理想选择。
关于温度范围，请参见规格。如果需要更高的温度限制，我们建议考虑GRAS探头话筒，话筒和前置放大器可与热源隔离。

设计
GRAS 46AM是一款高性能1/2“自由场标准话筒，用于测量各种频率下的中等声压级。在我们的洁净室环境中，这套设备是用标签组装和密封的。但是，如果您希望单独使用这些组件，则可以卸下麦克风组。
话筒
麦克风盒是高质量的IEC 61094 WS3F标准化GRAS 40AM 1/2“预极化自由场麦克风，设计用于多种环境下的长期可靠性。
预极化是通过驻极体在高度受控的条件下施加在传声器背板上获得的。然后对驻极体充电，以匹配的麦克风灵敏度。

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标准前置放大器，带BNC连接器，基于我们的电路板基板。在工业上，它们以其低噪声、宽频率和优良的回转率性能而闻名。
兼容性
为了按照规定执行，GRAS 46DD话筒组需要一个恒流输入模块，该模块可提供4 mA和24 V无负载CCP电压电源。如果恒流电源较低，则会降低长电缆的驱动能力，从而降低较高的频率。如果电源电压较低，则会影响较高的动态范围。
话筒组端接10/32 microdot母接头。各种类型和长度的现成同轴电缆组件可提供标准长度和定制长度。
46DD符合IEEE 1451.4 TEDS v.1.0标准。如果您的测量平台支持传感器电子数据表，您将能够读写数据，如属性和校准数据。

系统验证
TEDS的功能对于确定哪个麦克风连接到哪个输入通道非常有用。但是，这不是检查麦克风是否符合规格。因此，对于测量设置的日常验证和检查，我们建议使用像GRAS 42AG声音校准器这样的声源。
为了正确进行灵敏度校准，我们建议使用参考声源，如GRAS 42AP智能枪。
服务
如果您错误地损坏了GRAS话筒上的振膜，在大多数情况下，我们可以以非常合理的成本和较短的周转时间更换振膜。这不仅可以保护您的投资，而且还可以满足您的质量保证部门，因为您不必担心新的序列号等。
校准
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
规格
极化/连接
0 V/CCP
频率范围（±1 db）
赫兹
5-16 K
频率范围（±2 db）
赫兹
3.15-31.5 k
频率范围（±3 db）
赫兹
3.15-40 K
脂肪预放大器动态范围下限
DB（A）
25
脂肪CCP预放大器动态范围上限
DB
149
set灵敏度@250hz（±2 db）
MV/PA
14.5
set灵敏度@250hz（±2 db）
次来
-37
输出阻抗
奥尔
<50
输出电压摇摆，分钟.@24-28 CCP电压供应
维生素
8
直流偏置电压
v
12
传声器通风
雷尔
IEC 61094-4 compliance
WS2F
操作温度范围
摄氏度
-30 to 70/-22 to 158
温度范围
摄氏度
-40 to 85/-40 to 185
温度系数
DB/C/DB/F
-0.01/-0.006
静压系数
DB/KPA
-0.014
湿度范围
页：1
0 to 90
湿度系数
DB/%RH
-0.001
轴向振动的影响
DB RE 20微帕
66
Teds Utid（IEEE 1451.4）
27 V.1.0
连接器类型
英国广播公司
EC/Rohs compliant/Weee registered
是/是，是
GRAS46AM测量传声器  GRAS46AM测量传声器  GRAS46AM测量传声器
因为与不合适和不可靠的传感器相关的成本可能决定您的项目是否成功。对于我们的用户来说，数据安全直接转化为更容易选择麦克风、简单的系统配置和减少测量误差的要求。因为与不合适和不可靠的传感器相关的成本可能决定您的项目是否成功。对于我们的用户来说，数据安全直接转化为更容易选择麦克风、简单的系统配置和减少测量误差的要求。
GRAS 46AM是一款高性能1/2“自由场标准话筒，用于测量各种频率下的中等声压级。在我们的洁净室环境中，这套设备是用标签组装和密封的。但是，如果您希望单独使用这些组件，则可以卸下麦克风组。
话筒
麦克风盒是高质量的IEC 61094 WS3F标准化GRAS 40AM 1/2“预极化自由场麦克风，设计用于多种环境下的长期可靠性。
预极化是通过驻极体在高度受控的条件下施加在传声器背板上获得的。然后对驻极体充电，以匹配的麦克风灵敏度。
前置放大器
前置放大器是GRAS 26CA 1/2“CCP标准前置放大器，带BNC连接器，基于我们的电路板基板。在工业上，它们以其低自噪声、宽频率和优良的回转率性能而闻名。
兼容性
为了按照规定执行，GRAS 46DD话筒组需要一个恒流输入模块，该模块可提供4 mA和24 V无负载CCP电压电源。如果恒流电源较低，则会降低长电缆的驱动能力，从而降低较高的频率。如果电源电压较低，则会影响较高的动态范围。
话筒组端接10/32 microdot母接头。各种类型和长度的现成同轴电缆组件可提供标准长度和定制长度。
46DD符合IEEE 1451.4 TEDS v.1.0标准。如果您的测量平台支持传感器电子数据表，您将能够读写数据，如属性和校准数据。
系统验
TEDS的功能对于确定哪个麦克风连接到哪个输入通道非常有用。但是，这不是检查麦克风是否符合规格。因此，对于测量设置的日常验证和检查，我们建议使用像GRAS 42AG声音校准器这样的声源。
为了正确进行灵敏度校准，我们建议使用参考声源，如GRAS 42AP智能。
服务
如果您错误地损坏了GRAS话筒上的振膜，我们在大多数情况下都能以非常合理的成本和较短的周转时间进行更换。这不仅可以保护您的投资，而且还可以满足您的质量保证部门，因为您不必担心新的序列号等。
校准
出厂时，所有GRAS话筒均已在受控实验室环境中使用可追踪校准设备进行校准。根据使用、测量环境和内部质量控制程序，我们建议麦克风至少每年重新校准一次。
我们提供两种校准作为可选的售后服务：GRAS可追踪校准和GRAS认证校准。
GRAS可追溯校准是由受过培训的人员在受控条件下根据既定程序和标准进行的可追溯校准。这与所有GRAS话筒作为我们质量保证的一个组成部分进行的严格校准相同。
GRAS认证校准由GRAS认证校准实验室执行，该实验室已根据丹麦认证基金Danak的ISO 17025认证。
如果您想要一个新的麦克风套件，而不是默认的出厂校准，请在订购时。
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自由场标准话筒组，宽频
频率范围：3.15赫兹至31.5千赫
动态范围：25分贝（A）到149分贝
灵敏度：14.5 mV/pa
用途：用于一般声学诊断
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麦克风热卖的型号：
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