- Sound-intensity measurements
- Sound-source location
- Sound-power measurements
- IEC 61043 standard measurements
- Sound-source ranking
- Sound-intensity mapping
All components are made specifically for sound intensity applications. Each small 1⁄4-inch diameter by 40 mm long microphone preamplifier is housed in a robust stainless steel casing, which enables novel probe designs for reducing disturbances to the soundfield otherwise brought about by the effects of shadows and diffraction, and a symmetry which enables reliable calibrations as described in the proposed standard (ISO/DIS 9614-2) for sound power measurements using sound-intensity measurements.
The microphones are high sensitivity, free-field 1⁄2-inch condenser microphones with a uniquely designed pressure equalisation system which ensures extremely well defined phase characteristics. The microphones and preamplifiers are mounted on a swivel head on the telescopic arm of the Remote control handle. To cover the full frequency range from 50 Hz to 10 kHz, the 50AI probes are delivered with four solid spacers for spacing the microphones at 12 mm, 25 mm, 50 mm and 100 mm. These spacers can be easily interchanged without dismantling the probe.
The 50AI can also be supplied with a pair of phase-matched G.R.A.S. 40BI 1/4" microphones instead. The 40BI is for measuring very high intensity levels which lie above the dynamic range of the 40AK or in situations where the smaller size of the 40BI is necessary.
Different versions of the Type 50AI are available for connecting directly to a wide range of general purpose frequency analysers as well as specialised sound intensity analysers.
All versions are delivered in a carrying case, complete with microphones, preamplifiers, mechanical parts, windscreen and remote control handle. Special configurations can also be made to order.
|Frequency range (±1 dB)||Hz||TBD|
|Frequency range (±2 dB)||Hz||TBD|
|Frequency range (±3 dB)||Hz||TBD|
|Dynamic range lower limit (microphone thermal noise)||dB(A)||TBD|
|Dynamic range lower limit with G.R.A.S. preamplifier||dB(A)||TBD|
|Dynamic range upper limit||dB||TBD|
|Dynamic range upper limit with G.R.A.S. preamplifier @ +28 V / ±14 V power supply||dB||TBD|
|Dynamic range upper limit with G.R.A.S. preamplifier @ +120 V / ±60 V power supply||dB||TBD|
|Dynamic range upper limit with G.R.A.S. CCP preamplifier||dB||TBD|
|Open-circuit sensitivity @ 250 Hz (±2 dB)||mV/Pa||TBD|
|Open-circuit sensitivity @ 250 Hz (±2 dB)||dB re 1V/Pa||TBD|
|IEC 61094 designation||TBD|
|Temperature range, operation||°C / °F||TBD / TBD|
|Temperature range, storage||°C / °F||TBD / TBD|
|Temperature coefficient @250 Hz||dB/°C / dB/°F||TBD / TBD|
|Static pressure coefficient @250 Hz||dB/kPa||TBD|
|Humidity range non condensing||% RH||TBD|
|Humidity coefficient @250 Hz||dB/% RH||TBD|
|Influence of magnetic field @80 A/m, 50 Hz||dB re 20 µPa||TBD|
|Influence of axial vibration @1 m/s²||dB re 20 µPa||TBD|
|Connector type||3 m 7-pin LEMO Cable|
|CE/RoHS compliant/WEEE registered||No/No|
|Weight||g / oz||/ TBD|