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Sound and Vibration Instrument Hire and Calibration

GRAS Sound Intensity Equipment


Sound Intensity Probes and Phase Matched Intensity Microphone Sets

GRAS 50AI : Sound Intensity Probe  
GRAS Sound Intensity Probe

The GRAS 50AI has been withdrawn, the following information is for reference purposes

The 50AI is durable and easy to use probe that fully complies with the requirements of IEC 1043 for Class 1 sound intensity probes. Early probes used existing microphones preamplifiers etc., but this generation uses new components and microphones with inherent relative phase accuracy through a newly designed venting system.
The GRAS sound intensity probe includes a set of 1/2" intensity microphones type 40AI, with spacers, adaptors, preamplifiers and a remote control handle to control the complete data acquisition process from the probe handle.
Delivered with 8 mm, 12 mm, 25 mm, 50 mm and 100 mm spacers which may be interchanged without dismantling the probe, our probe has built in control and direct connection for the Norsonic 840 real time - intensity analyser.


For direct use with the Nor 840 real time / intensity analyser.
Add a Nor-1461 adaptor to use with Nor 830 real time and intensity analysers.
To use with other compatible analysers with Lemo 1B connectors include a GRAS AA 0011 cable.
For use with compatible analysers, without Lemo 1B connectors, see the GRAS 12AA Power Supply
Manufacturer's Specifications
The matched sound intensity microphone kit may be hired separately - see below
GRAS 40AK : Sound Intensity Microphone Set £ 12 a day *
GRAS Sound Intensity Microphone Set The 40AK set includes two phase matched 1/2" intensity microphones, spacers and 1/4" preamplifier adaptors.
The microphones have a free field response optimised for use in face to face configuration intensity probes and have high sensitivity to enable low level measurements.
The pair of microphones full fill the phase requirements for Class 1 intensity microphones, according to IEC Draft International Standard 1043.
The 40AK set includes solid spacers for intensity probe configurations with 8 mm, 12 mm, 25 mm, 50 mm and 100 mm microphone separation to cover the full frequency range from 50 Hz up to 10 kHz, even under the most adverse measurement conditions.
Manufacturer's Specifications
The 40AK also includes two right angle and one straight adaptor to connect the microphones with 1/4" preamplifiers.
See our other Sound Intensity equipment available for hire
* Our standard hire charges are based on a 4-day minimum period, details other options.

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