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Product Catalogue Measurement Microphones Standards Specials Customized

We make Microphones Since the company was established in 1994, we have been 100% dedicated to develop and manufacture high-quality measurement microphones and related acoustic equipment. world’s most popular and probably most copied acoustic sensor: The 1/2” measurement microphone. Then the 1/4” and 1/8” microphones followed with outstanding dynamic and high-frequency capability that brought higher definition and transparency into impulse noise diagnostics. Many variants have been made available over the years; all based on Gunnar Rasmussen’s original 1” pressure microphone design....

Andersen, we safeguard our heritage and knowledge to help create new opportunities with our customers. We work with everybody who has an interest in sound or noise within the fields of aerospace, automotive, audiology, consumer electronics, noise monitoring, building acoustics and tele-communications, metrology, education, consultancy, legislation and system integration. Quality All our microphones are solely produced in stainless steel and in a quality that allows for a 5 year warranty. Unique repair service Should you by mistake damage the diaphragm on a G.R.A.S. microphone, our special...

MICROPHONE SELECTION

PISTONPHONESAND CALIBRATION EQUIPMENT

MICROPHONE SELECTION Measurement microphones are available in many types covering various frequency ranges, dynamic ranges and application situations. The following guide is provided to help select the right microphone for a given application. Selecting a microphone involves a number of choices, which can be summarized as: Externally polarized vs. prepolarized Free-field, Pressure or Random incidence Dynamic range Frequency range Externally polarized vs. prepolarized All G.R.A.S. measurement microphones are of the condenser type. This requires a polarization voltage which can either be...

Measurement microphones can be divided into three groups: Free-field, Pressure, and Random incidence. The differences between microphones from group to group are at the higher frequencies, where the size of a microphone becomes comparable with the wavelengths of the sound being measured. Free-field microphones A free-field microphone is designed essentially to measure the sound pressure as it was before the microphone was introduced into the sound field. At higher frequencies the presence of the microphone itself in the sound field will disturb the sound pressure locally. The frequency...

MICROPHONE MICROPHONESSELECTION Dynamic range of a microphone The dynamic range of a microphone can be defined as the range between the lowest level and the highest level that the microphone can handle. This is not only a function of the microphone alone, but also of the preamplifier used with the microphone. The dynamic range of a microphone is, to a large extent, directly linked to its sensitivity. In general, a microphone with a high sensitivity will be able to measure very low levels, but not very high levels, and a microphone with low sensitivity will be able to measure very high...

Frequency range of a microphone The frequency range of a microphone is defined as the interval between its upper limiting frequency and its lower limiting frequency. With today’s microphones it is possible to cover a frequency range starting from around 1Hz and reaching up to 140 kHz. Low frequency measurements require a microphone with a well controlled static pressure equalization with a very slow venting. Special versions are available for infra-sound measurements. High frequency measurements are very sensitive to diaphragm stiffness, damping and mass as well as diffraction. Upper...

TEDS MICROPHONES MICROPHONE SETS workflow for the user and minimizing typical handling errors. New approach With the unique transducer combinations G.R.A.S. is introducing a new approach to measurement microphones and to measurement data safety. The sets are assembled in a dust free environment to avoid contamination of the interface between the microphone and preamplifier and have been sealed with a label. The label can be removed and the set dismantled, if desired by the user. By analyzing the feedback from our multi- as well as 1-channel users we realized that there was a need for a...

transducers according to IEEE 1451.4 Transducer Electronic Data Sheet (TEDS) you can simply plug in the microphones and they will identify themselves with their specific properties, types and calibration data. A feature especially appreciated by multi-channel users. Cables The CCP sets use high quality coaxial cables whereas the LEMO sets use a special, soft type of multi-core shielded cable. Some sets have a 3 m cable included and others have cables as accessories. It should be noted that longer cables will influence the upper frequency and dynamic ranges. Calibration data All microphone...

G.R.A.S. 46AC 1/2" LEMO Free-field Standard Microphone Set, Wide Frequency G.R.A.S. 46AP 1/2" LEMO Pressure Standard Microphone Set, High Sensitivity 46AC is a high-performance 1/2" free-field standard microphone set for measuring medium sound pressure levels at high frequencies; with built-in TEDS and 7-pin LEMO connector. Cables available: AA0008/09/20-CL. 46AP is a 1/2" general purpose pressure microphone set with built-in TEDS and 7-pin LEMO connector. G.R.A.S. 46AR G.R.A.S. 46AF 1/2" LEMO Random incidence Standard 1/2" LEMO Free-field Standard Microphone Set Microphone Set 46AF...

LEMO MICROPHONE SETS G.R.A.S. 46BH 1/4” LEMO Pressure Standard Microphone Set, High Pressure G.R.A.S. 46DP 1/8” LEMO Pressure Standard Microphone Set 46DP is a 1/8” pressure microphone set with built-in TEDS and integrated 3 m cable with 7-pin LEMO connector. 46BH is a 1/4” high pressure microphone set with built-in TEDS and integrated 3 m cable with a 7-pin LEMO connector. G.R.A.S. 46BP 1/4” LEMO Pressure Standard Microphone Set 46BP is a 1/4” high frequency pressure microphone set for high level measurements with built-in TEDS and integrated 3 m cable with a 7-pin LEMO connector. Output...