1. 45CA Headphone/Hearing-protector Test Fixture
    ISO: 4869-3
    IEC: 60318-1 and 60318-4 depending on configuration

    G.R.A.S. 45CA Headphone/Hearing-protector Test Fixture

    The G.R.A.S. 45CA Hearing-protector Test Fixture is a versatile test fixture for measuring sound isolation of hearing-protectors according to ISO 4869-3 and ear- and headphones according to IEC60318-1 or 60318-4.
    For testing hearing-protectors according to ANSI/ASA S12.42, choose G.R.A.S. 45CB.

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  2. 40AZ 1/2" Free-field Mic, Low Frequency
    Freq range: 0.5 Hz to 20 kHz
    Dyn range: 14 dB(A) to 148 dB
    Sensitivity: 50 mV/Pa

    G.R.A.S. 40AZ 1/2" Prepolarized Free-field Microphone, Low Frequency

    The 40AZ is a prepolarized free-field microphone with a large dynamic range and a wide frequency response. Its externally polarized equivalent is G.R.A.S. 40AN.

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  3. 40BE 1/4" Free-Field Mic
    Freq range: 4 Hz to 80 kHz
    Dyn range: 30 dB(A) to 168 dB
    Sensitivity: 4 mV/Pa

    G.R.A.S. 40BE 1/4" Prepolarized Free-Field Microphone

    The 40BE is an IEC 61094 WS3F 1/4” prepolarized free-field microphone with rear-venting. The externally polarized equivalent is 40BF.

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  4. 40DP 1/8" Pressure Mic
    Freq range: 6.5 Hz to 140 kHz
    Dyn range: 40 dB(A) to 178 dB
    Sensitivity: 1 mV/Pa

    G.R.A.S. 40DP 1/8" Ext. Polarized Pressure Microphone

    The 40DP is an IEC 61094 1/8" externally polarized pressure microphone with rear-venting. Due to its tiny size, this high-precision condenser microphone can be used to measure very high frequency sounds without disturbing the sound field. Learn More
  5. 26CB 1/4" CCP Standard Preamp (Mdot)
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.35 dB
    Special feature: General purpose

    G.R.A.S. 26CB 1/4" CCP Standard Preamplifier with Microdot Connector

    The G.R.A.S. 26CB 1/4" CCP Standard Preamplifier with Microdot Connector is a general-purpose preamplifier optimized for use with prepolarized condenser microphones. It is a small, robust unit and uses a G.R.A.S. CCP power supply, e.g. G.R.A.S. 12AL. It has a very low inherent noise level, a large dynamic range, and a frequency response from below 2 Hz to above 200 kHz.

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  6. 26CG 1/4" CCP Preamp, Low Frequency (Mdot)
    Freq range: 1 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.35 dB
    Special feature: For low-frequency applications

    G.R.A.S. 26CG 1/4" CCP Preamplifier with Microdot Connector, Low Frequency

    The G.R.A.S. 26CG ¼″ CCP Preamplifier is a small robust unit optimised for acoustic measurements using condenser microphones. It has a very low inherent noise level, a wide dynamic range, and a wide frequency response from below 1 Hz to above 200 kHz.

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  7. 26AR 1/4" Standard Preamp, Mini-connector
    Freq range: 2.5 Hz - 200 kHz
    Noise: 4 µV
    Gain: -0.35 dB
    Special feature: For integration into structures

    G.R.A.S. 26AR 1/4" Standard Preamplifier with Integrated Mini-connector

    The G.R.A.S. 26AR 1/4" Preamplifier is a small robust unit short enough for use in confined spaces. It has a very low inherent-noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

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  8. 45CB Acoustic Test Fixture
    ANSI: S12.42

    G.R.A.S. 45CB Acoustic Test Fixture

    The G.R.A.S. 45CB Acoustic Test Fixture is specified and designed for measuring sound isolation of hearing-protectors and ear- and headphones according to the ANSI/ASA S12.42 standard. For testing in accordance with the ISO 4869-3 standard, choose G.R.A.S. 45CA.

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  9. 67SB Blast Probe Mic
    Freq range: 10 Hz to 20 kHz
    Dyn range: 44 dB(A) to 174 dB

    G.R.A.S. 67SB Blast Probe Microphone according to ANSI S12.42

    The G.R.A.S. 67SB Blast Probe is designed as a reference microphone for impulse measurements according to the ANSI/ASA S12.42 standard.

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  10. AM0069 Windscreen for 1/2" Microphones

    Outer diameter: 90 mm
    Hole diameter: 12 mm
    Material: Foam

    G.R.A.S. AM0069 Windscreen for 1/2" Microphones

    AM0069 contains 5 spherical windscreens for 1/2" microphones optimized for sound pressure measurements under free-field conditions.

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  11. 40BP 1/4" Pressure Mic
    Freq range: 4 Hz to 70 kHz
    Dyn range: 34 dB(A) to 169 dB
    Sensitivity: 1.6 mV/Pa

    G.R.A.S. 40BP 1/4" Ext. Polarized Pressure Microphone

    The 40BP is an IEC 61094 WS3P 1/4" externally polarized pressure microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. It is a low-sensitivity microphone for sound measurements at high levels and high frequencies. Its low sensitivity makes it ideal for measuring high sound pressure levels of up to 174 dB. Its small size reduces the effects of diffraction and reflections around the microphone resulting in a frequency range extending up to 70 kHz.

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  12. 46DP-1 1/8" Pressure Set
    Freq range: 6.5 Hz to 140 kHz
    Dyn range: 46 dB(A) to 178 dB
    Sensitivity: 0.9 mV/Pa

    G.R.A.S. 46DP-1 1/8" LEMO Pressure Standard Microphone Set

    The 46DP-1 is a 1/8” LEMO microphone set for pressure measurements. 

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  13. 47AC 1/2" CCP Infra-Sound Mic Set
    Freq range: 0.09 Hz to 20 kHz
    Dyn range: 20 dB(A) to 148 dB
    Sensitivity: 8 mV/Pa

    G.R.A.S. 47AC 1/2" CCP Infra-Sound Microphone Set

    The G.R.A.S. 47AC is a 1/2" CCP free-field microphone set optimized for infra-sound measurements down to 0.09 Hz.

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  14. 67TS-1-CL Turbulence Screen Kit with Flush-mount Microphone
    Turb. att.: Up to 25 dB*
    Turb. speed: Up to Mach 0.2
    Turb. suppr. freq. range: 500 Hz - 10 kHz*
    Acoustic att.: Less than 3 dB
    Directivity: ± 60 Deg
    Freq. range (acoustic) 100 Hz - 70 kHz
    Dyn.range 44 dB(A) - 166 dB
    *Depending on flow-speed

    G.R.A.S. 67TS-1-CL Turbulence Screen Kit with Flush-mount Microphone

    The G.R.A.S. 67TS-1-CL Turbulence Screen Kit is designed for aeroacoustic testing in solid-walled wind tunnels. The hydrodynamic component of turbulence is attenuated up to 25 dB. Thereby the acoustic signals of interest can be identified and diagnosed with a reliable resolution.

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  15. 47AX 1/2'' CCP Flush-mount Mic Set
    Freq range: 3.15 Hz to 20 kHz
    Dyn range: 22 dB(A) to 150 dB
    Sensitivity: 12.5 mV/Pa

    G.R.A.S. 47AX 1/2'' CCP Flush-mount Microphone Set

    The G.R.A.S. 47AX 1/2" CCP Flush-Mount Microphone Set is a low profile 1/2" precision pressure microphone with built-in CCP preamplifier.

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  16. 47BX 1/4" CCP Flush-mount Microphone Set
    Freq range: 4 Hz to 70 kHz
    Dyn range: 44 dB(A) to 166 dB
    Sensitivity: 1.6 mV/Pa

    G.R.A.S. 47BX 1/4" CCP Flush-mount Microphone Set

    The G.R.A.S. 47BX 1/4" CCP Flush-Mounted Microphone Set is a low profile 1/4" precision pressure microphone with built-in CCP preamplifier.

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  17. 47DX 1/8” CCP Flush-mount Mic Set
    Frequency range: 10 Hz to 100 kHz
    Dynamic range: 52 dB(A) to 173 dB
    Sensitivity: 0.8 mV/Pa

    G.R.A.S. 47DX 1/8” CCP Flush-mount Microphone Set

    The G.R.A.S. 47DX 1/8" CCP Flush-mount Microphone Set is a low profile 1/8" precision pressure microphone with built-in CCP preamplifier and TEDS.

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  18. 40LS 1/4" CCP Precision Surface Mic
    Freq range: 5 Hz to 70 kHz
    Dyn range: 46 dB(A) to 167 dB
    Sensitivity: 1.8 mV/Pa

    G.R.A.S. 40LS 1/4" CCP Precision Surface Microphone

    The G.R.A.S. 40LS High-Precision Surface Microphone is a high-precision microphone for measurements on planar and curved surfaces. It has a wide useful frequency range reaching up to 70 kHz and a large dynamic range topping at around 167 dB.

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  19. 40LA 1/4" CCP Precision Surface Mic, High Pressure
    Freq range: 5 Hz to 70 kHz
    Dyn range: 56 dB(A) to 178 dB
    Sensitivity: 0.5 mV/Pa

    G.R.A.S. 40LA 1/4" CCP Precision Surface Microphone, High Pressure

    The G.R.A.S. 40LA High-Precision Surface Microphone is a high-precision microphone for measurements on planar and curved surfaces. It has a wide useful frequency range reaching up to 70 kHz and a large dynamic range topping at around 178 dB.

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  20. 46AO 1/2'' Pressure Set
    Freq range: 3.15 Hz to 20 kHz
    Dyn range: 25 dB(A) to 150 dB
    Sensitivity: 12 mV/Pa

    G.R.A.S. 46AO 1/2'' CCP Pressure Standard Microphone Set

    The 46AO is a 1/2" CCP microphone set for wide-frequency pressure measurements. Its LEMO equivalent is 46AG.

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