ANSI/ASA S1.4 - 1983 (R2006): Specification for Sound Level Meters
This standard conforms closely to the IEC Standard for Sound Level Meters, Publication 651, First Edition issued in 1979. This revision represents a significant improvement over ANSI S1.4-1971, particularly in its specifications relating to measurement of transient sound signals. It also permits the use of digital techniques and displays.
The principal changes from ANSI S1.4-1971 are: inclusion of an optional impulse exponential-time averaging characteristic; inclusion of an optional peak characteristic; more rigorous definition of the dynamic characteristics for the Fast and Slow exponential-time-averaging; increase in the crest factor requirement to ten for type 1 instruments; specification of a type 0 laboratory instrument with generally smaller tolerance limits than those previously specified for type 1; and deletion of the type 3 survey instrument.
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