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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.
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Manufacturer's Specifications Certification traceable to NPL.
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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.
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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 analyser.
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