For microphones
Length: 47.5 mm
Diam.: 12.70 mm
GRAS RA0016 20 dB Attenuator for externally polarized 1/2" microphones
Recommendation: Choose a microphone with low sensitivity instead of using the RA0016.The RA0016 is a 20 dB attenuator for inserting between a 1/2" microphone and preamplifier. It will attenuate the output signal of the microphone by 20 dB in order to avoid overloading the preamplifier. The RA0016 is useful when measuring very high sound pressure levels using a preamplifier with limited dynamic range. The RA0016 will work properly only with externally polarized microphones. For prepolarized microphones, use the RA0018.
Length: 36.7 mm
Outer diameter: 7.00 mm
Threading (mic. protection grid threading): 6.35-60 UNS-2
Material: stainless steel
Weight: 7 g
GRAS RA0022 1/4" Nosecone
The RA0022 is specially designed and optimized for use with 1/4" microphones for sound pressure measurements, when high speed wind comes from one known direction e.g. in a wind tunnel.
Turb. att.: Up to 25 dB*
Turb. speed: Up to Mach 0.2
Freq. range (turbulence) 500 Hz - 10 kHz*
Acoustic att.: Less than 3 dB
Directivity: ± 60 Deg *Depending on flow-speed
GRAS 67TS 湍流屏蔽套件
GRAS 67TS 湍流屏蔽套件设计用于在实壁风洞中进行空气声学测试。湍流的流体动力成分被衰减达 25 dB。因此,能以可靠的分辨率识别和诊断感兴趣的声学信号。
Material: Black POM
GRAS AL0007 Clips for 1/4” intensity microphones
Microphone clips 12 mm and 25 mm for side-by-side mounting of a pair of 1/4” intensity microphones.
Material: Stainless steel
Dimension: For 1/4”
Special feature: Freely adjustable
GRAS AL0013 1/4" Microphone Holder, Stainless Steel Accessories
The GRAS AL0013 is an adapter for mounting a microphone set (microphone/preamplifier) on tripods having a standard 1/4” UNC-20 male thread. The adapter is provided with a clamp for attaching a 1/4" diameter preamplifier.
Outer diameter: 90 mm
Hole diameter: 12 mm
Material: Foam
GRAS AM0069 Windscreen for 1/2" Microphones
AM0069 contains 5 spherical windscreens for 1/2" microphones optimized for sound pressure measurements under free-field conditions.
Outer diameter: 90 mm
Hole diameter: 6 mm
Material: Foam
GRAS AM0071 Windscreen for 1/4" Microphones
AM0071 contains 5 spherical windscreens for 1/4" microphones optimized for sound pressure measurements under free-field conditions.
Outer diameter: 90 mm
Hole diameter: 23 mm
Material: Foam
GRAS AM0363 Windscreen for 1" Microphones
AM0363 contains 5 spherical windscreens for 1" microphones optimized for sound pressure measurements under free-field conditions.
Outer diameter: 40 mm
Hole diameter: 6 mm
Material: Foam
GRAS AM0364 Windscreen for Array Microphones
AM0364 contains 6 spherical windscreens optimized for 1/4" dedicated array microphones, or other 1/4" microphone sets mounted in array modules PR0001 & PR0002.
Diameter x length: 95 x 190 mm
Slot for standard Intensity Probe
Material: Foam
GRAS AM0376 Windscreen for Intensity Probes
The AM0376 is an elliptical windscreen for use with GRAS Sound Intensity Probe 50GI.
Length: 10 mm
Inner threading for preamp.: 5.70-60 UNS-2
Outer threading for mic.: 11.70-60 UNS-2
Material: stainless steel
GRAS RA0001 Right-angled (90º) Adapter for 1/2" microphone and 1/4" preamplifier
The RA0001 is a right-angled adapter for using a 1/2" microphone with a 1/4" preamplifier. It can be used with any standard 1/2" microphone and 1/4" preamplifier such as the GRAS 26AC. The RA0001 could be useful in situations where the microphone has to be flush mounted on a wall.
Length: 10 mm
Inner threading for preamp.: 5.70-60 UNS-2
Outer threading for mic.: 11.70-60 UNS-2
Material: stainless steel
GRAS RA0003 Adapter for 1/2" microphone and 1/4" preamplifier
The GRAS RA0003 is a straight adapter, for placing between a 1/2" microphone and a 1/4" preamplifier.
Length: 9 mm Inner threading for preamp.: 5.70-60 UNS-2
Outer threading for mic.: 5.70-60 UNS-2
Material: stainless steel
GRAS RA0006 Right-angled (90º) Adapter for 1/4" Microphone and 1/4" Preamplifier
The RA0006 is a right-angled adapter for using a 1/4" microphone with a 1/4" preamplifier. It can be used with any standard 1/4" microphone and 1/4" preamplifier such as the GRAS 26AC. The RA0006 could be useful in situations where the microphone has to be flush mounted on a wall.
Length: 4 mm
Diameter: 23.77 mm
Material: stainless steel
GRAS RA0017 Adapter for 1" microphone and 1/2" preamplifier
The RA0017 is a simple adapter for using a 1" microphone with a 1/2" preamplifier. It can be used with any standard 1" microphone and 1/2" preamplifier such as the GRAS 26AK.
Length: 47.5 mm
Diam.: 12.70 mm
GRAS RA0018 20 dB Attenuator for prepolarized 1/2" microphones
Recommendation: Choose a microphone with low sensitivity instead of using the RA0018.RA0018 is a 20 dB attenuator for inserting between a 1/2" prepolarized microphone and preamplifier. It will attenuate the output signal of the microphone by 20 dB in order to avoid overloading of the preamplifier. The RA0018 is useful when measuring very high sound pressure levels using a preamplifier with limited dynamic range.The RA0018 will work properly only with prepolarized microphones. For externally-polarized microphones, use the RA0016.
Length: 70 mm
Inner threading for preamp.: 11.70-60 UNS-2
Outer threading for mic.: 5.70-60 UNS-2
Material: stainless steel
GRAS RA0019 Adapter for 1/4" microphone and 1/2" preamplifier
The RA0019 is an adapter for using a 1/4" microphone with a 1/2" preamplifier. Its influence on the acoustic field is minimal. To reduce attenuation of the microphone signal, the guard ring of the preamplifier is extended through the RA0019.
Length: 54.0 mm
Outer diameter: 13.2 mm
Threading (mic. protection grid threading): 12.70-60 UNS-2
Material: Stainless steel
Weight: 45 g
GRAS RA0020 1/2" Nosecone
The RA0020 is specially designed and optimized for use with 1/2" microphones for sound pressure measurements, when high speed wind comes from one known direction e.g. in a wind tunnel.
Length: 54.0 mm
Outer diameter: 13.0 mm
Threading (mic. protection grid threading): 12.70-60 UNS-2
Material: Aluminum (black anodized)
Weight: 15 g
GRAS RA0020-A 1/2" Nosecone, lightweight
RA0020-A is a nosecone for 1/2" microphones. It is similar to RA0020 but made of aluminium for lightness.
Length: 36.7 mm
Outer diameter: 7.35 mm
Threading (mic. protection grid threading): M 6,5x0,2
Material: stainless steel
Weight: 7 g
GRAS RA0026 ¼” Nosecone for 46BC and 46BL-1
The RA0026 is specially designed and optimized for use with 1/4" microphones for sound pressure measurements, when high speed wind comes from one known direction e.g. in a wind tunnel.
Length: 17 mm
Inner threading for preamp.: 5.70-60 UNS-2
Outer threading for mic.: M3
Material: stainless steel
GRAS RA0063 Adapter for 1/8" microphone and 1/4" preamplifier
The RA0063 is an adapter for using a 1/8" microphone with a 1/4" preamplifier. It can be used with any standard 1/8" microphone and 1/4" preamplifier such as the GRAS 26AC.
Length (excl. connector): 47.50 mmDiam.: 12.70 mm
GRAS RA0067 Transmitter Adapter for 1/2" microphones
The GRAS RA0067 enables a prepolarized 1/2" microphone (typically a GRAS 40AD) to be used as a high-impedance sound source.
Length: 63 mm
The thick end is provided with:
Inner threading for preamp.: 11.70-60 UNS-2
Outer threading for mic.: 23.11-60 UNS-2
Material: stainless steel
GRAS RA0073 Adapter for 1" microphone and 1/2" preamplifier
The RA0073 is an adapter for using a 1˝ microphone with a ½˝ preamplifier.The influence of the RA0073 on the acoustic field is minimal.
Length: 18.95 mm
Diameter: 23.77 mm
Material: Stainless steel
GRAS RA0077 NBS 9-A Coupler adapter for 1/2” microphone
The GRAS RA0077 adapts a 1/2” microphone (remove grid) into a 1" microphone (without grid). Designed for NBS 9A / IEC 60313 Coupler GRAS RA0075 and Artificial Ear with NBS Coupler GRAS 43AF.
GRAS RA0081 Special tool for gripping 1/2” microphones
Pliers for firm but gentle gripping of a 1/2” microphone when unscrewing its protection grid or unscrewing the microphone from a preamplifier.
Length: 39 mm
Inner threading for preamp.: 5.70-60 UNS-2
Outer threading for mic.: M3
Material: stainless steel
GRAS RA0082 Adapter for 1/8" microphone and 1/4" preamplifier (long version)
The GRAS RA0082 is an adapter for using a 1/8" microphone with a 1/4" preamplifier.
Length: (excl. connector): 37.5 mm
Diameter: 6.35 mm
Material: stainless steel
GRAS RA0086 Transmitter Adapter for 1/4" microphones
The GRAS RA0086 is similar to the GRAS RA0067 but is used with a 1/4" externally polarised microphone (typically a GRAS 40BP) which can then be used as a high-impedance sound source, e.g. when calibrating an acoustic coupler such as the GRAS RA0045. The RA0086 has a microdot connector.
GRAS RA0091 Insulated 1/2” microphone protection grid
For avoiding ground loops, e.g. with GRAS RA0085 Insulated coupling for artificial ear in telephone testing set-ups using the GRAS 43AD Artificial Ear.
GRAS RA0092 Rain-protection Cap for array microphones
Cap for rain protection of GRAS array microphones GRAS 40PR and 40PQ. It also fits QC microphones 40PP and 40PK.
GRAS RA0095 Dehumidifier for 1” microphones
For use when humidity levels are high and only with a rear-vented 1” microphone. An indicator placed on the side of the dehumidifier shows when it needs to be dried out before further use. In the case of the GRAS 40EH 1” Microphone used in the GRAS 40HF Low-noise Level Microphone System, please order only at the time of ordering a GRAS 40HF.
Length: 17.00 mm
Diameter: 23.77 mm
Material: Stainless steel
GRAS RA0116 Adapter for 1/2" microphone
For use with GRAS RA0113 2cc Coupler.
Length: 11.60 mm
Diameter: 12.70 mm
Material: Stainless steel
GRAS RA0117 Coupler adapter for 1/2” to 1/4” microphone
The RA0117 is an adapter for mounting a 1/4" microphone in couplers designed for 1/2" microphones.
Length: 22.0 mm
Diam.: 6.35 mm
GRAS RA0118 Attenuator for 1/4" microphones
Recommendation: Choose a microphone with low sensitivity instead of using the RA0118. The RA0118 is an attenuator for inserting between a 1/4" microphone and preamplifier. It attenuates the output signal of the microphone by approximately 16 dB in order to avoid overloading the preamplifier or following analyzer. The RA0118 is useful when measuring very high sound pressure levels using a preamplifier or analyzer with limited dynamic range.
GRAS RA0122 Random-incidence corrector
For use with 1/2” Free-field microphones when measuring noise according to ANSI requirements.
GRAS RA0127 Rain-protection cap for 1/4” microphones
The RA0127 is a rain protection cap for use with 1/4" microphones.
GRAS RA0131 Rain-protection cap for 1/2” microphones
The GRAS RA0131 is a rain protection cap for use with 1/2" microphones.
Length: 48 mm
Inner threading for preamp.: 11.70-60 UNS-2
Outer threading for mic.: 11.70-60 UNS-2
Material: stainless steel
GRAS RA0132 Dehumidifier for 1/2” microphones
For use when humidity levels are high and only with a rear-vented 1/2” microphone.An indicator placed on the side of the dehumidifier shows when it needs to be dried out before further use.
Length: 17.4 mm
Outer diameter: 3. 5mm
Threading (mic. protection grid threading): M3.175x0.2
Material: Stainless steel
Weight: tbd
GRAS RA0173 1/8” Nosecone
The RA0173 is specially designed and optimized for use with 1/8" microphones for sound pressure measurements, when high speed wind comes from one known direction e.g. in a wind tunnel.
Length: 15.2 mmInner threading for preamp.: 11.70-60 UNS-2Outer threading for mic.: 11.70-60 UNS-2Material: stainless steel
GRAS RA0190 Right-angled (90º) Adapter for 1/2" Microphone and 1/2" Preamplifier
The RA0190 is a right-angled adapter for using a 1/2" microphone with a 1/2" preamplifier. It can be used with any standard 1/2" microphone and 1/2" preamplifier. The RA0190 could be useful in situations where the microphone has to be flush mounted on a wall.
Material: Stainless steel
GRAS RA0302 Removal Tool for 1/2" and 1/4" Flush-mount Microphones
GRAS RA0302 is a removal tool for 1/2" and 1/4" flush-mount microphones.