GRAS 42AA

Pistonphone Calibrator - class 1

£ 6 a day *

Battery operated for field checks of complete systems.
Laboratory calibration of measurements microphones

114 dB at 250 Hz or 105.4 dBA.

For use with 1/2" and 1/4" microphones, includes a barometer with correction values.

Manufacturer's Specifications

Certification traceable to NPL.

GRAS 51AB

Sound Intensity Calibrator

£ 8 a day *

For phase and level calibration of both 1/2" and 1/4" sound intensity microphone pairs. The 51AB may be used for residual intensity testing, level and the particle velocity calibration as specified in BS EN 61043.

The calibrator consists of a sound source which supplies a well defined sound pressure field simultaneously to both measurement microphones, so the resulting phase difference can be expressed as the Pressure Intensity Index.

For sound intensity and particle velocity calibration a phase shifting element is inserted between the source and the receiving part of the calibrator, resulting in a phase shift similar to that found in a free field.

Manufacturer's Specifications

Needs an external generator producing white, pink or sine waves via a BNC connector, which is included in the Nor 840 analyzer.


* Our standard hire charges are based on a 4-day minimum period. Click here for details and other options.

Gracey & Associates   01933 624212

BSI accreditation for sound and vibration instrument hire and calibration

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