Typical applications and use
- Outdoor-noise measurements
- Aircraft-noise monitoring
- IEC 61672 measurements
- Simple field calibration
With an externally-polarized Free-field Microphone 40AF and Preamplifier 26AK. Alternatively, Preamplifier 26AJ, with aSysCheck * feature, is available. By applying a SysCheck signal to pin 1 of the preamplifier, the response of the system will reveal any drift in sensitivity.
In both cases the reference direction for measurements is along the axis of symmetry - (i.e. 0° angleof incidence) for measurements according to IEC 61672, typically aircraft-noise monitoring.
Simple field calibration
All that is required is unscrewing the windscreen and mounting a pistonphone/calibrator directly onto the exposed microphone.
A desiccator unit (e.g. G.R.A.S. AL0014) is available if the 41AO is to be placed outdoors for extended periods. It screws directly onto the base of the 41AO and removes moisture from the air entering the unit.
* A standard feature of most G.R.A.S. Power Modules (e.g. 12AK) used for powering Microphone Preamplifiers
|Dynamic range lower limit (microphone thermal noise)||dB(A)||14|
|Dynamic range upper limit||dB||146|
|Set sensitivity @ 250 Hz (±2 dB)||mV/Pa||50|
|Power supply, single||V||28 (single) / ± 14 to ± 60 (dual)|
|Power consumption||mA||0.7 (± 14 V) / 2.3 (± 60 V)|
|Temperature range, operation||°C / °F||- 30 to 70 / - 22 to 158|
|Connector type||3 m 7-pin LEMO|
|CE/RoHS compliant/WEEE registered||Yes/Yes/Yes|
[PRODUCT NAME 8
|G.R.A.S. AM0370||Complete Windscreen for 41AO|
|G.R.A.S. AA0008||Preamplifier extension cable with 7 pin LEMO to 7 pin LEMO|
|G.R.A.S. AM0029||Pole adapter|
|G.R.A.S. AL0014||Desiccator Box for 41AO|
|G.R.A.S. AM0009||Windscreen for 41AM/CN/AL/AO|
|G.R.A.S. 42AA||Pistonphone, Class 1|
|G.R.A.S. 42AP||Intelligent Pistonphone, Class 0|