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Acoustic Standards

Instrument Type Grade Standards
Sound Level Meter Type 0 (Laboratory reference)
Type 1 (Laboratory & Field)
Type 2 (General Field)
Type 3 (Field Check)		 IEC 60651
ANSI S1.4
Integrating Sound Level Meter Type 0 (Laboratory reference)
Type 1 (Laboratory & Field)
Type 2 (General Field)
Type 3 (Field Check)

IEC 60804
ANSI S1.43
Acoustic Calibrator Class 0 (most accurate)
Class 1
Class 2 (least accurate)		 BS 7189:1989
IEC 942:1988
IEC 60942:1988
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