Typical applications and use
- Multi-channel measurements
- Sound-field analyses
- Sound-power measurements
- Concurrent spatial and transient measurements
It has a wide useful frequency range reaching up to 20 kHz and a large dynamic range topping at around 135 dB.
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. 40PH 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 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 G.R.A.S. pistonphone, e.g. G.R.A.S. 42AA, is as straight forward 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 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|
|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|
|CE/RoHS compliant/WEEE registered||Yes / Yes / Yes|
|Weight||g / oz||5.50 / 0.20|
Frequency response according to IEC 61672-1
Typical frequency response