Accurate sound levels
Page 96
If you've noticed an error in this article please click here to report it so we can fix it.
HEALTH and Safety at work legislation and the likely future need to monitor vehicle noise emissions will require sound level meters to be used. However, all codes of practice relating to sound measurement demand the use of a calibrator to ensure that the sound level is accurately calibrated.
Cirrus Research has introduced a new self-calibrating sound level meter, the CRL 2.21A which based as it is on an existing model, the CRL 2.21. It has, says Cirrus, the advantage of established technology with acoustic calibration and extended measuring range and is totally self-contained.
The microphone, mounted on a flexible gooseneck, is plugged into the output of an acoustic generator which is mounted next to the microphone socket. The generator produces a level of 94dB at lkHz and so the complete sound level meter, from microphone to meter can be calibrated.
The calibrator section of the instrument has no commonality with the sound level meter except the batteries and case, and so says Cirrus, the combined instrument costs less and is more practical than two separate units.
Cirrus Research, Scarborough. Tel: 0723 71441.