G.R.A.S. 40PS CCP Surface Microphone

Freq range: 20 Hz to 10 kHz
Dyn range: 32 dB(A) to 136 dB
Sensitivity: 5 mV/Pa
  • 40PS CCP Surface Mic
  • 40PS CCP Surface Mic
  • 40PS CCP Surface Mic
  • 40PS CCP Surface Mic
  • 40PS CCP Surface Mic
  • 40PS CCP Surface Mic
  • 40PS CCP Surface Mic
  • 40PS CCP Surface Mic

Typical applications and use

  • Wind-induced noise on ground and airborne vehicles
  • Acoustic radiation from surfaces
  • Noise tests in wind tunnels
  • Comparing the external noise on a moving vehicle with its internal noise


Together with any of the G.R.A.S. mountings, the profile of the surface microphone is just 2.8 mm. Its wide frequency range extends from 20 Hz to 10 kHz and its large dynamic range is from below 32 dB(A) to 136 dB.

It has an integrated CCP preamplifier with a built-in TEDS chip which enables it to be programmed as a complete unit.

Close manufacturing tolerances together with the advantages of the TEDS chip, provide the G.R.A.S. 40PS with a high degree of interchangeability; a major advantage which excludes accounting for individual characteristics.

The G.R.A.S. 40PS requires a constant-current power supply such as the G.R.A.S. 12AL 1-Channel CCP Power Module with A-weighting filter, or any other compatible constant-current power supply.

The G.R.A.S. 40PS is both stable and robust and has an integrated 1.5 m coaxial cable with a microdot connector. It is delivered with a supple detachable silicon-rubber fairing.

Because of its lightness, the G.R.A.S. 40PS can be readily mounted with its fairing on surfaces using a double-sided adhesive pad contributes very little mass to thin plates.

Pressure equalisation is via a vent placed at the front of the microphone just by the side of its diaphragm. This is important especially when used on aircraftand on road vehicles in mountainous country.

Pistonphone Calibration

The G.R.A.S. 40PS can be easily calibrated using a G.R.A.S. Pistonphone and a special Adapter RA0145.

Individual Calibration

All G.R.A.S. Surface Microphones are individually checked and calibrated before leaving the factory.

An individual calibration chart is supplied with each microphone and also includes an individual pressure frequency response.

Frequency range (±1 dB) Hz 100 to 3 k
Frequency range (±3 dB) Hz 20 to 10 k
Dynamic range lower limit (microphone thermal noise) dB(A) <32
Dynamic range upper limit with G.R.A.S. CCP preamplifier dB 136
Set sensitivity @ 250 Hz (±2 dB) mV/Pa 5
Polarization voltage V 0
Power supply (Constant Current Power) mA 2 to 10
Microphone venting Front
Output impedance Ω <50
Temperature range, operation °C / °F -10 to 50 / 14 to 122
Temperature range, storage °C / °F -40 to 85 / -40 to 185
TEDS UTID (IEEE 1451.4) 27 v. 1.0
Connector type Microdot 10/32
CE/RoHS compliant/WEEE registered Yes / Yes / Yes
Weight g / oz 3 / 0.101

Typical pressure frequency response


G.R.A.S. GR0815 Fairing
G.R.A.S. GR0933 Top adhesive pad 0.5 mm (pre-cut, single-sided)
G.R.A.S. GR0934 Base adhesive pad 0.13 mm (pre-cut, double-sided)
G.R.A.S. MI0031 Cleaning tissue
G.R.A.S. AE0046 Adapter BNC male to microdot female



G.R.A.S. RA0147 Aluminum mounting plate
G.R.A.S. 42AP Intelligent Pistonphone, Class 0
G.R.A.S. 42AA Pistonphone, Class 1
G.R.A.S. 12AL CCP supply
G.R.A.S. RA0145 Calibration adapter for Pistonphone