Sound level meter
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A FULLY transistorized sound-level meter, the 1400G, has been introduced by Dawe Instruments. It is contained in a tough plastics case measuring 12.5 by 4.375 by 2.5in. It weighs only 21b 10oz and is fully portable.
A ceramic microphone picks up and transmits sounds throughout a range from 24 to 140 decibels either direct or via a 20ftlong cable when required. The microphone is virtually non-directional.
Weighting networks are incorporated in the instrument to adapt its response to that of the human ear at various levels and it complies with both British and international specifications and recommendations.
Push-buttons control the selection of sensitivity ranges in steps of 10 decibels and the indicating meter can be set to give fast or slow response. The instrument is equipped for use with filters, frequency analysers and similar equipment. The indicating meter is calibrated from —6 to + 10 decibels; the instrument also incorporates a device to check the state of the 1.5V battery with which it is powered. It comes complete with leather carrying case and shoulder strap.
Made by: Dawe Instruments Ltd., Western Avenue, London, W3.
Price: £126.