Typical applications and use
- Ground array measurements
- General noise measurements
- Ideal for the aerospace industry
The 67AX is a ground array microphone kit designed for the aerospace industry, i.e. for measurement of noise from overhead aircraft.
The microphone set is designed to sit asymmetrically in the mounting to attain a more uniform frequency response for measurements.
The G.R.A.S. 47AX microphone is a IEC 61094 1/2'' CCP Flush-mount Microphone Set with a dynamic range from 22 dB to 150 dB and a frequency range from 3.15 Hz to 20 kHz. Its height of only 8 mm (to the diaphragm) is the ideal match for the design of the 67AX. The built-in preamplifier is a low noise constant current power (CCP) type, with a built-in TEDS circuit for automatic transducer identification.
|Frequency range (±1 dB)||Hz||5 to 12.5 k|
|Frequency range (±2 dB)||Hz||3.15 to 20 k|
|Dynamic range lower limit (microphone thermal noise)||dB(A)||22|
|Dynamic range upper limit||dB||150|
|Dynamic range upper limit with G.R.A.S. CCP preamplifier||dB||149|
|Set sensitivity @ 250 Hz (±2 dB)||mV/Pa||12.5|
|Temperature range, operation||°C / °F||-30 to 70 / -22 to 158|
|Temperature range, storage||°C / °F||-40 to 85 / -40 to 185|
|Static pressure coefficient @250 Hz||dB/kPa||-0.008|
|Humidity range non condensing||% RH||1 to 100|
|Humidity coefficient @250 Hz||dB/% RH||< 0.1|
|Influence of axial vibration @1 m/s²||dB re 20 µPa||66|
|TEDS UTID (IEEE 1451.4)||27 v. 1.0|
|CE/RoHS compliant/WEEE registered||Yes/Yes/Yes|
|Weight||g / oz||15 / 0.529|
Placement of the microphone in the plate with the windscreen on top. The cutaway of section A to A shows how the microphone fits into the plate.
|G.R.A.S. 47AX-S1||1/2'' CCP Flush-mounted Microphone Set|
|G.R.A.S. GR1425||Ground plate Ø400 mm|
|G.R.A.S. AM0375||Windscreen for 67AX|
|G.R.A.S. AA0069||3 m Microdot Angled - BNC cable|
|G.R.A.S. 42AP||Intelligent Pistonphone, Class 0|
|G.R.A.S. RA0216||Pistonphone field-verification adapter|
|G.R.A.S. RA0221||Pistonphone calibration adapter|