GRAS麦克风46BE设计理念GRAS风球货期快价格好
gras麦克风46be设计理念gras风球货期快价格好
gras麦克风 gras风球 gras放大器 gras模块 gras前置器 gras厂家直销 gras代理
46be的设计理念：
--46be是一款高效率的用于测量高度声量级和高频段音频的麦克风套装，其被设计可长时间稳定用于复杂多元环境下。
--46be的预偏振是通过一个在严格控制条件下负荷于麦克风底板的电介体还获得，然后电介体会充电以匹配特定的麦克风感音性。
--46be的自带前置放大器是配备microdot连接器的标准前置放大器26cb，其是基于gras著名的电路板底座而设计的。gras电路板以其低自噪，宽频率以及超高转换速率而闻名业内。
机遇，抓住了就会成功，错过了就会失败。书籍，学习就是知识，没看就是废纸。理想，努力了叫梦想，放弃了只是妄想。努力，虽然未必会有收获，但放弃就一定一无所获。再好的机会，也要靠人把握，放手去做
为了执行指定的gras 46be麦克风设置需要一个恒定电流输入模块，可以提供4毫安和24 v卸载ccp电压供应。如果恒流源较低，则驱动长电缆的能力降低，从而降低了上行频率。如果电源电压较低，将影响上动态范围。
麦克风组用10/32 unc微型女性连接器终止。各种规格和长度的同轴电缆组件可用于标准和定制长度。
46be是ieee 1451.4 teds v 1兼容。如果您的测量平台支持换能器电子数据表，您将能够读取和写入数据，如属性和校准数据。
系统验证
teds的功能对于确定哪一个麦克风连接到哪个输入通道是非常有用的。然而，它不是检查麦克风是否在规格之内。为了日常验证和检查您的测量设置，因此我们建议使用像gras 42ag声音校准器这样的声源。
对于适当的灵敏度校准，我们建议使用参考声源，如gras 42ap智能活塞式电话。
校准
当离开工厂时，所有的gras麦克风已经在可控的实验室环境中使用可追溯的校准设备进行了校准。根据使用、测量环境和内部质量控制程序，我们建议麦克风每年至少重新校准一次。
我们提供两种校准作为一种可选的售后服务：gras溯源校准和gras认证校准。
gras可追溯校准是由受过训练的人员根据既定的程序和标准在控制条件下进行的可追溯校准。这与严格的校准是一样的，所有的gras麦克风都作为我们质量保证的组成部分。
gras认证校准由gras认证校准实验室执行，该实验室已根据iso 17025由丹麦认证基金danak认证。
如果您想要一个新的麦克风组交付的认证校准代替默认的工厂校准，指定订购时。
在gras／calb学习更多。
质量与保证
gras麦克风组由我们经过验证的标准组合的组件组成，并且全部由高质量的材料和品牌部件制造，这些部件被选择和加工以确保终身稳定性和鲁棒性。
所有零件都是在丹麦的工厂由熟练和专业的操作人员在一个经过验证的洁净室环境中生产和组装的。麦克风膜片、主体和独特的保护栅格由不锈钢制成，使麦克风组能够抵抗物理损伤以及由腐蚀性空气或气体引起的腐蚀。
这一点，加上强制镀金麦克风终端保证了高度可靠的连接。由于质量好，我们对有缺陷的材料和工艺的保修期为5年。
服务
如果你们错误地损坏了gras麦克风上的光圈，在大多数情况下，我们能够以非常合理的成本和短的周转时间来更换它。这不仅可以保护您的投资，而且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。
gras 46be典型应用与使用
46be是一个自由场麦克风组，这样就优化了所有声学应用，其中主声源的位置是已知的，麦克风可以直接指向它，确保0°入射。然而，应该注意的是，1/4“麦克风主体和隔膜的小尺寸也使得压力和随机入射（扩散场）测量到20 khz，而不去除保护栅极或需要进一步补偿。如果你不能指出你的声场的性质，这个有用的特性是非常有用的。
高截止频率使得它适合于超声诊断和脉冲测量，其中小失真和高分辨率是通过膜片的小尺寸和快速响应获得的。
关于温度范围，请参阅说明书。如果需要更高的温度限制，我们建议考虑gras探头麦克风，麦克风和前置放大器可以与热源隔离。
gras 46be设计
gras 46be是一种高性能的1/4“自由场标准麦克风，用于测量高频下的高声压水平。在我们的洁净室环境中，用一个标签组装和密封。但是，如果您希望单独使用这些组件，可以拆卸麦克风组。
gras 46be话筒
麦克风盒是高质量的iec 61094 ws3f标准gras 40be 1/4“预极化自由场麦克风，设计用于多种环境中的长期可靠性。
预极化是通过驻极体获得的，驻极体在高度受控的条件下施加在麦克风背板上。然后，驻极体充电以匹配指定的麦克风灵敏度。
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 46be 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. however it should be noted that the small size of the 1/4 microphone body and diaphragm also enables pressure and random-incidence (diffuse field) measurements up to 20 khz without removing the protection grid or need for further compensation. this all-use feature is very useful if you are not able to point out the nature of your sound field.)
the high cut-off frequency makes it ideal for ultra-sonic diagnostics and impulse measurements, where minimum distortion and high resolution are obtained by the small size and fast response of the diaphragm.
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 46be is a high-performance 1/4 free-field standard microphone set for measuring high sound pressure levels at high 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 40be 1/4 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 26cb 1/4 ccp standard preamplifier with microdot 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 46be 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 unc microdot female connector. ready to use coax cable assemblies of various types and lengths are available in standard as well as customized lengths.
the 46be 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.
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.
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.
gras 46be前置放大器
前置放大器是gras 26cb 1/4“ccp标准前置放大器与微连接器，并基于我们众所周知的电路板基板。在工业中，它们以其低自噪声、宽频率和优良的转换速率性能而闻名。
gras 46be 1/4 ccp free-field standard microphone set
测量麦克风组
测量麦克风集已经结合起来，所以它们满足了用户的典型测量需求。独立于您的测量系统和应用程序，您应该能够找到一套适合您的需求。麦克风设置可以直接连接到所有专业的测量系统，如可供中国共产党和7雷莫输入。
如果你的测量平台支持智能传感器根据ieee 1451.4（teds）你可以简单地插入麦克风，他们会认同他们的特性、类型和校准数据。多频道用户特别欣赏的特性。
gras麦克风套装46be概述：
通过与客户的密切合作,gras明白数据安全是非常重要的,因为在不合适的和不可靠的传感器上投入的成本可能会决定你的项目结果导向是成功与否。对于用户来说,数据安全要求更简约的麦克风选择,更简单的系统配置,更稀少的测量误差。为满足这些需求,gras发明了麦克风套装的概念。这是一个简约，可靠又耐用的整合了麦克风和前置放大器的产品概念，由于这种设计理念使得只有一个感应数值需要计算同时避免了接口处的污染，所以几乎杜绝了测量误差。gras通过将独到且经认证的设计理念有机结合，为用户提供了最为可靠且实用的测音麦克风综合套组。
--46be是一款为声学应用而设计的自由场麦克风套装，当声源位置已知时，46be可以以其确保的0°入射角直接指向测量音源。
--46be在不移除防护栏且无需进一步校准补偿的情况下，其1/4极小尺寸任然可以确保压力及无规律入射（扩散声场）的测量阈值高达20khz。
--46be的这种全方位、多功能测量范围使得用户在不能确定声场属性的时候显得极为有用。
--46be的高截止频率使得它是一款理想的超声波诊断和脉冲测量仪，同时其小巧的尺寸和快反应振膜也确保了极小失真率和极高分辨率。
46be的校准标准：
--出厂时，所有gras麦克风都已经过受控实验室环境中使用的可溯源校准设备的调试与校准。根据使用情况，测量环境以及内部质量控制计划，gras建议麦克风应至少每年校准一次。
gras提供了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麦克风作为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，该实验室已通过丹麦认证基金danak的iso 17025认证。
丹麦g.r.a.s（gras麦克风）应用范围：
--gras测量麦克风可以在多种频率范围、动态范围和不同的应用场合下使用。
要选择适合您的具体测量需要的麦克风，您的考虑很可能被概括为:
--自由场、压力场或随机事件。
--动态范围和频率范围。
电容话筒的输出是一个非常高的阻抗信号，因此对电缆的电容负载非常敏感。这使得需要引入高输入阻抗和低输出阻抗的驱动。这样的驱动器称为前置放大器。
前置放大器的频率范围是由它的电子电路决定的，通常在高端有200 khz，下端为1- 10hz。下端由前置放大器的输入阻抗和麦克风的电容决定。高传声器电容提供低截止频率。
前置放大器的动态范围被定义为前置放大器能处理的最高电平之间的距离，并且是可以测量的最低水平。极高水平与前置放大器的电源电压有关，而最低电平与前置放大器本身产生的电噪声有关。
gras 46ae
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gras al0030
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gras 46bl
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gras op0040
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gras 46bp-1
gras 46dp-1
gras 46bh-1
gras am0069
gras am0009
gras am0071
gras am0363
gras am0376
gras am0364
gras am0033
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gras am0038
gras am0089
gras am0029
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gras麦克风 gras风球 gras放大器 gras模块 gras前置器 gras厂家直销 gras代理
46be的设计理念：
--46be是一款高效率的用于测量高度声量级和高频段音频的麦克风套装，其被设计可长时间稳定用于复杂多元环境下。
--46be的预偏振是通过一个在严格控制条件下负荷于麦克风底板的电介体还获得，然后电介体会充电以匹配特定的麦克风感音性。
--46be的自带前置放大器是配备microdot连接器的标准前置放大器26cb，其是基于gras著名的电路板底座而设计的。gras电路板以其低自噪，宽频率以及超高转换速率而闻名业内。
机遇，抓住了就会成功，错过了就会失败。书籍，学习就是知识，没看就是废纸。理想，努力了叫梦想，放弃了只是妄想。努力，虽然未必会有收获，但放弃就一定一无所获。再好的机会，也要靠人把握，放手去做
为了执行指定的gras 46be麦克风设置需要一个恒定电流输入模块，可以提供4毫安和24 v卸载ccp电压供应。如果恒流源较低，则驱动长电缆的能力降低，从而降低了上行频率。如果电源电压较低，将影响上动态范围。
麦克风组用10/32 unc微型女性连接器终止。各种规格和长度的同轴电缆组件可用于标准和定制长度。
46be是ieee 1451.4 teds v 1兼容。如果您的测量平台支持换能器电子数据表，您将能够读取和写入数据，如属性和校准数据。
系统验证
teds的功能对于确定哪一个麦克风连接到哪个输入通道是非常有用的。然而，它不是检查麦克风是否在规格之内。为了日常验证和检查您的测量设置，因此我们建议使用像gras 42ag声音校准器这样的声源。
对于适当的灵敏度校准，我们建议使用参考声源，如gras 42ap智能活塞式电话。
校准
当离开工厂时，所有的gras麦克风已经在可控的实验室环境中使用可追溯的校准设备进行了校准。根据使用、测量环境和内部质量控制程序，我们建议麦克风每年至少重新校准一次。
我们提供两种校准作为一种可选的售后服务：gras溯源校准和gras认证校准。
gras可追溯校准是由受过训练的人员根据既定的程序和标准在控制条件下进行的可追溯校准。这与严格的校准是一样的，所有的gras麦克风都作为我们质量保证的组成部分。
gras认证校准由gras认证校准实验室执行，该实验室已根据iso 17025由丹麦认证基金danak认证。
如果您想要一个新的麦克风组交付的认证校准代替默认的工厂校准，指定订购时。
在gras／calb学习更多。
质量与保证
gras麦克风组由我们经过验证的标准组合的组件组成，并且全部由高质量的材料和品牌部件制造，这些部件被选择和加工以确保终身稳定性和鲁棒性。
所有零件都是在丹麦的工厂由熟练和专业的操作人员在一个经过验证的洁净室环境中生产和组装的。麦克风膜片、主体和独特的保护栅格由不锈钢制成，使麦克风组能够抵抗物理损伤以及由腐蚀性空气或气体引起的腐蚀。
这一点，加上强制镀金麦克风终端保证了高度可靠的连接。由于质量好，我们对有缺陷的材料和工艺的保修期为5年。
服务
如果你们错误地损坏了gras麦克风上的光圈，在大多数情况下，我们能够以非常合理的成本和短的周转时间来更换它。这不仅可以保护您的投资，而且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。
gras 46be典型应用与使用
46be是一个自由场麦克风组，这样就优化了所有声学应用，其中主声源的位置是已知的，麦克风可以直接指向它，确保0°入射。然而，应该注意的是，1/4“麦克风主体和隔膜的小尺寸也使得压力和随机入射（扩散场）测量到20 khz，而不去除保护栅极或需要进一步补偿。如果你不能指出你的声场的性质，这个有用的特性是非常有用的。
高截止频率使得它适合于超声诊断和脉冲测量，其中小失真和高分辨率是通过膜片的小尺寸和快速响应获得的。
关于温度范围，请参阅说明书。如果需要更高的温度限制，我们建议考虑gras探头麦克风，麦克风和前置放大器可以与热源隔离。
gras 46be设计
gras 46be是一种高性能的1/4“自由场标准麦克风，用于测量高频下的高声压水平。在我们的洁净室环境中，用一个标签组装和密封。但是，如果您希望单独使用这些组件，可以拆卸麦克风组。
gras 46be话筒
麦克风盒是高质量的iec 61094 ws3f标准gras 40be 1/4“预极化自由场麦克风，设计用于多种环境中的长期可靠性。
预极化是通过驻极体获得的，驻极体在高度受控的条件下施加在麦克风背板上。然后，驻极体充电以匹配指定的麦克风灵敏度。
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 46be 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. however it should be noted that the small size of the 1/4 microphone body and diaphragm also enables pressure and random-incidence (diffuse field) measurements up to 20 khz without removing the protection grid or need for further compensation. this all-use feature is very useful if you are not able to point out the nature of your sound field.)
the high cut-off frequency makes it ideal for ultra-sonic diagnostics and impulse measurements, where minimum distortion and high resolution are obtained by the small size and fast response of the diaphragm.
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 46be is a high-performance 1/4 free-field standard microphone set for measuring high sound pressure levels at high 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 40be 1/4 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 26cb 1/4 ccp standard preamplifier with microdot 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 46be 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 unc microdot female connector. ready to use coax cable assemblies of various types and lengths are available in standard as well as customized lengths.
the 46be 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.
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.
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.
gras 46be前置放大器
前置放大器是gras 26cb 1/4“ccp标准前置放大器与微连接器，并基于我们众所周知的电路板基板。在工业中，它们以其低自噪声、宽频率和优良的转换速率性能而闻名。
gras 46be 1/4 ccp free-field standard microphone set
测量麦克风组
测量麦克风集已经结合起来，所以它们满足了用户的典型测量需求。独立于您的测量系统和应用程序，您应该能够找到一套适合您的需求。麦克风设置可以直接连接到所有专业的测量系统，如可供中国共产党和7雷莫输入。
如果你的测量平台支持智能传感器根据ieee 1451.4（teds）你可以简单地插入麦克风，他们会认同他们的特性、类型和校准数据。多频道用户特别欣赏的特性。
gras麦克风套装46be概述：
通过与客户的密切合作,gras明白数据安全是非常重要的,因为在不合适的和不可靠的传感器上投入的成本可能会决定你的项目结果导向是成功与否。对于用户来说,数据安全要求更简约的麦克风选择,更简单的系统配置,更稀少的测量误差。为满足这些需求,gras发明了麦克风套装的概念。这是一个简约，可靠又耐用的整合了麦克风和前置放大器的产品概念，由于这种设计理念使得只有一个感应数值需要计算同时避免了接口处的污染，所以几乎杜绝了测量误差。gras通过将独到且经认证的设计理念有机结合，为用户提供了最为可靠且实用的测音麦克风综合套组。
--46be是一款为声学应用而设计的自由场麦克风套装，当声源位置已知时，46be可以以其确保的0°入射角直接指向测量音源。
--46be在不移除防护栏且无需进一步校准补偿的情况下，其1/4极小尺寸任然可以确保压力及无规律入射（扩散声场）的测量阈值高达20khz。
--46be的这种全方位、多功能测量范围使得用户在不能确定声场属性的时候显得极为有用。
--46be的高截止频率使得它是一款理想的超声波诊断和脉冲测量仪，同时其小巧的尺寸和快反应振膜也确保了极小失真率和极高分辨率。
46be的校准标准：
--出厂时，所有gras麦克风都已经过受控实验室环境中使用的可溯源校准设备的调试与校准。根据使用情况，测量环境以及内部质量控制计划，gras建议麦克风应至少每年校准一次。
gras提供了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麦克风作为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，该实验室已通过丹麦认证基金danak的iso 17025认证。
丹麦g.r.a.s（gras麦克风）应用范围：
--gras测量麦克风可以在多种频率范围、动态范围和不同的应用场合下使用。
要选择适合您的具体测量需要的麦克风，您的考虑很可能被概括为:
--自由场、压力场或随机事件。
--动态范围和频率范围。
电容话筒的输出是一个非常高的阻抗信号，因此对电缆的电容负载非常敏感。这使得需要引入高输入阻抗和低输出阻抗的驱动。这样的驱动器称为前置放大器。
前置放大器的频率范围是由它的电子电路决定的，通常在高端有200 khz，下端为1- 10hz。下端由前置放大器的输入阻抗和麦克风的电容决定。高传声器电容提供低截止频率。
前置放大器的动态范围被定义为前置放大器能处理的最高电平之间的距离，并且是可以测量的最低水平。极高水平与前置放大器的电源电压有关，而最低电平与前置放大器本身产生的电噪声有关。
gras 46ae
gras 46ac
gras 46ap
gras 46ar
gras 46af
gras 46bf
gras 46ag
gras 46dp
gras 46ao
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gras 26ab
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gras 26hg
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gras 26ck
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gras 26cg
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gras 26cs
gras 41ac
gras 40hf
gras 40hh
gras al0030
gras aa0079
gras 46bl
gras 46bd
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
gras am0069
gras am0009
gras am0071
gras am0363
gras am0376
gras am0364
gras am0033
gras am0037
gras am0038
gras am0089
gras am0029
gras am0052
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