Typical applications and use
- Multi-channel measurements
- Sound-field 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||142|
|Set sensitivity @ 250 Hz (±3 dB)||mV/Pa||10|
|Power supply (Constant Current Power)||mA||2 to 20|
|Power consumption||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||5.5 / 0.2|
50Hz - 100Hz
100Hz - 3kHz
3kHz - 5kHz
5kHz - 10kHz
Typical frequency response
---- Pressure response
___ Free-field response