11. Winner is chosen via a sound level meter ( in a live match ) or voting ( online ). 12. Even the most accurate approved sound level meter must be regularly checked for sensitivity what most people loosely call'calibration '. 13. Sound level meters and dosimeters are two types of devices that are used to measure sound levels in the workplace.14. The audio units each hold two back-up audiometers and sound level meters which are operated by qualified occupational health specialists. 15. After complaints from the public, in September 2006 the agency purchased fifteen sound level meters for distribution to its regional offices. 16. This is defined in IEC 61012 as AU weighting and while very desirable, is rarely fitted to commercial sound level meters . 17. Similarly, the American National Standards Institute ( ANSI ) specifies sound level meters as three different Types 0, 1 and 2. 18. Other sound level meters can be used to double check dosimeter measurements, or used when dosimeters cannot be worn by the employees. 19. :: : The above proposals to use a calibrated sound level meter to calibrate a home-brew combination of microphone and amplifier is flawed. 20. Until 2003 there were separate standards for exponential and linear integrating sound level meters , but since then IEC 61672 has described both types.
