G.R.A.S. 40PL CCP Free-field Array Microphone, High Pressure

Freq range: 50 to 20 kHz
Dyn range: 32 dB(A) to 150 dB
Sensitivity: 10 mV/Pa
  • 40PL Free-Field Array Mic, High Pressure

Typical applications and use

  • Multi-channel measurements
  • Sound-fi eld analyses
  • Sound-power measurements
  • Concurrent spatial and transient measurements


It 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 G.R.A.S. 40PL requires a constant current power supply, e.g. the G.R.A.S. 12AL CCP Supply, or any other CCP compatible power supply.

Close manufacturing tolerances together with the advantages of the TEDS chip provide the G.R.A.S. 40PL with a high degree of interchangeability; a major advantage when used in multiples forming arrays and matrices.

The low cost of the G.R.A.S. 40PL is a key consideration when setting up measurements requiring a multiplicity of concurrent transient and spatial data.

Calibrating the G.R.A.S. 40PL with a G.R.A.S. pistonphone (G.R.A.S. 42AP is recommended) is as straightforward as calibrating any other G.R.A.S. 1/4-inch microphone.

All G.R.A.S. microphones are individually checked and calibrated before leaving the factory. An individual calibration chart is supplied with each microphone.

Frequency range (±1 dB) Hz 50 to 5 k
Frequency range (±2 dB) Hz 5 k to 20 k
Frequency range (±3 dB) Hz 10 to 50
Dynamic range lower limit (microphone thermal noise) dB(A) < 32
Dynamic range upper limit dB 150
Set sensitivity @ 250 Hz (±3 dB) mV/Pa 10
Power supply (Constant Current Power) mA 2 to 20
Power consumption mA 2 to 20
Microphone venting Front
Output impedance Ω < 50
Temperature range, operation °C / °F -10 to 50 / -50 to 122
Temperature range, storage °C / °F -40 to 85 / -40 to 185
Influence of axial vibration @1 m/s² dB re 20 µPa 50
TEDS UTID (IEEE 1451.4) 27 v. 1.0
Connector type SMB
CE/RoHS compliant/WEEE registered Yes / Yes / Yes
Weight g / oz 5.5 / 0.2

Frequency response according to IEC 61672-1

Typical frequency response

Optional items

G.R.A.S. AA0027

3 m SMB - BNC Cable

G.R.A.S. 12AL

1-Channel CCP Power Module with A-weighting filter

G.R.A.S. PR0002

Array Module

G.R.A.S. AM0364

Windscreens (set of 6)

G.R.A.S. RA0092

Rain-protection cap

G.R.A.S. 42AA


G.R.A.S. 42AB

Sound Calibrator, Class 1