GRAS 40PH CCP Free-field Array Microphone

Freq range: 10 to 20 kHz
Dyn range: 32 dB(A) to135 dB
Sensitivity: 50 mV/Pa

Technology

Typical applications and use

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

Design

Array microphones are designed to be mounted on large or small arrays. Such systems are typically used for measuring and locating noise sources, and here the phase match is important to get good accuracy in the measurements. An important characteristic of array microphones are precisely that the microphones are phase-matched.

40PH has a wide useful frequency range reaching up to 20 kHz and a large dynamic range topping at around 135 dB,  the peak value before visible clipping.

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 GRAS 40PH requires a constant current power supply, e.g. 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 40PH with a high degree of interchangeability; a major advantage when used in multiples forming arrays and matrices.

The low cost of the 40PH is a key consideration when setting up measurements requiring a multiplicity of concurrent transient and spatial data.

Calibrating the 40PH with a GRAS pistonphone, e.g. GRAS 42AA, is as straight forward as calibrating any other GRAS 1/4-inch microphone.

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

Specifications

Coupler volume
mm³
0.4 ccm
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
135
Set sensitivity @ 250 Hz (±2 dB)
mV/Pa
50
Power supply (Constant Current Power)
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
5.50 / 0.20
Specification Conditions

Phase Match

 

50Hz  - 100Hz

    ±5˚

100Hz  - 3kHz

    ±3˚

3kHz  - 5kHz

    ±5˚

5kHz  - 10kHz

    ±10˚

Frequency response according to IEC 61672-1

Typical frequency response

Upper curve shows free-field response at 0°, lower curve (dotted line) shows pressure response.

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Dimensions

 

Ordering info

Optional items

GRAS AA0027

3 m SMB - BNC Cable

GRAS 12AL

1-Channel CCP Power Module with A-weighting filter

GRAS PR0002

Array Module

GRAS AM0364

Windscreens (set of 6)

GRAS RA0092

Rain-protection cap

GRAS 42AA

Pistonphone, Class 1

GRAS 42AG

Multifunction Sound Calibrator, Class 1

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

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