A Sound Level Calibrator or Acoustic Calibrator is a hand-held device that emits an audible tone of very accurate level and frequency. Before making noise measurements the Calibrator is fitted over the meter's microphone and the reading is either checked manually by the user or automatically by the meter.
Checking a meter's calibration is always good practice and for many applications it is essential. Most regulations, like the Noise at Work Regulations, demand that the meter is calibrated before making measurements. Records should be kept of these calibrations as evidence that the correct procedures have been followed.
The Calibrator should meet the standard IEC 60942 to either Class 1 or Class 2. The Class 1 calibrator is a little more accurate than the Class 2. In general, if you have a Class 1 (or Type 1) Sound Level Meter then you should use a Class 1 Calibrator. If you have a Class 2 Sound Level Meter you can use either a Class 2 or Class 1 Calibrator.
|Class 1||± 0.3 dB||Checking the calibration of Class 1 or Class 2 Sound Level Meters|
|Class 2||± 0.5 dB||Checking the calibration of Class 2 Sound Level Meters|
* Under reference conditions as specified in IEC 60942.
See the following pages for more information about the calibrators we have available: