GRAS 40LS 1/4" CCP Precision Surface Microphone
Freq range: 5 Hz to 70 kHz
Dyn range: 46 dB(A) to 167 dB
Sensitivity: 1.8 mV/Pa
The GRAS 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.
Technology
Typical applications and use
- Automotive industry
- Wind-induced noise measurement on vehicles
- Outdoor measurements on testing grounds
- Wind-tunnel testing
Design
Just 2.5 mm thick, the 40LS has an integrated CCP preamplifier and is delivered with a built-in TEDS chip, which enables it to be programmed as a complete unit.
The 40LS requires a constant-current power supply, such as the GRAS 12AL CCP Supply, or any other CCP compatible power supply.
Close manufacturing tolerances together with the advantages of the TEDS chip, provide the 40LS with a high degree of interchangeability; a major advantage which excludes accounting for individual characteristics.
The 40LS is both very stable and robust. It has an integrated 1.5 m co-axial cable with a microdot connector and is delivered with a supple detachable silicon-rubber fairing.
Because of its lightness, the microphone with fairing can readily be mounted on surfaces using double-sided adhesive tape.
All GRAS microphones are individually checked and calibrated before leaving the factory.
An individual calibration chart is supplied with each microphone.
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.
Specifications
Typical frequency response
GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.
Dimensions
Ordering info
Included items
GRAS GR0933 |
Adhesive tape, pre-cut, single-sided |
GRAS GR0934 |
Adhesive tape, pre-cut, double-sided |
GRAS MI0031 |
Cleaning tissue |
GRAS AE0046 |
Adapter, BNC male to Microdot female |
GRAS GR1252 |
Silicon-rubber fairing |
Optional items
GRAS 12AQ |
Power Module (2-ch.) |
GRAS RA0202 |
Calibration Adapter (required) |
GRAS 42AP |
Intelligent Pistonphone with built-inprecision barometer (250 Hz or 251.2 Hz,114 dB ±0.05 dB) (recommended) |
GRAS 42AA |
Pistonphone (250 Hz, 114 dB ±0.08 dB) |
GRAS GR1297 |
Stainless-steel fairing |
GRAS CA0029 |
Traceable Calibration of Microphone Set |
GRAS CA2301 |
Accredited Calibration of Microphone Set |
GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.