Abstract
ANSI and IEC have prepared draft standards on meters to measure workers sound exposure. The standards have a number of similarities. Both are based on IEC 804, integrating‐averaging sound level meters, and both are intended to specify meters worn on a worker and to measure noise throughout a work day. The ANSI draft specifies meters with exchange rates of 3, 4, or 5 dB, with a fast or slow time constant and a threshold. The IEC draft specifies only a 3‐dB exchange rate with no time constant or threshold. The ANSI draft specifies a read out in percent dose while the IEC draft is developed around Pascal squared hours. For continuous noise above the threshold, the reading can be converted from one set of units to the other. For intermittent and impulsive, a noise significant difference will occur.
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