AS IEC 61672.1-2004

1 Scope2 Normative references3 Terms and definitions4 Reference environmental conditions5 Performance specifications 5.1 General 5.2 Adjustments to indicated levels 5.3 Directional response 5.4 Frequency weightings 5.5 Level linearity 5.6 Self-generated noise 5.7 Time weightings F and S 5.8 Toneburst response 5.9 Response to repeated tonebursts 5.10 Overload indication 5.11 Under-range indication 5.12 Peak C sound level 5.13 Reset 5.14 Thresholds 5.15 Display 5.16 Analogue or digital output 5.17 Timing facilities 5.18 Radio frequency emissions and disturbances to a public power supply 5.19 Crosstalk 5.20 Power supply6 Environmental, electrostatic, and radio frequency criteria 6.1 General 6.2 Static pressure 6.3 Air temperature 6.4 Humidity 6.5 Electrostatic discharge 6.6 AC power frequency and radio frequency fields7 Provision for use with auxiliary devices8 Marking9 Instruction manualAnnex A (normative) - Maximum expanded uncertainties of measurementAnnex B (informative) - AU weightingAnnex C (informative) - Specifications for time-weighting I (impulse)Bibliography

Provides electroacoustical performance specifications of sound level meters. Identical with and reproduced from IEC 61672-1:2002.

1.1 This standard gives electroacoustical performance specifications for three kinds ofsound measuring instruments: a conventional sound level meter that measures exponential time-weighted sound level; an integrating-averaging sound level meter that measures time-average sound level; and an integrating sound level meter that measures sound exposure level.A single instrument may make any, or all, of the three kinds of measurements. Additionalperformance specifications are given for the measurement of maximum time-weighted soundlevel and peak C sound level. Frequency-weighting A is mandatory for all sound level metersspecified in this standard.1.2 Sound level meters conforming to the requirements of this standard have a specifiedfrequency response for sound incident on the microphone from one principal direction in anacoustic free field or from random directions.1.3 Sound level meters specified in this standard are intended to measure sounds generallyin the range of human hearing.NOTE For measurement of audible sound in the presence of ultrasound, the AU weighting, specified in IEC 61012[1], may be applied.1.4 Two performance categories, class 1 and class 2, are specified in this standard. In general, specifications for class 1 and class 2 sound level meters have the same design goals and differ mainly in the tolerance limits and the range of operational temperatures. Tolerancelimits for class 2 specifications are greater than, or equal to, those for class 1 specifications.1.5 This standard is applicable to a range of designs for sound level meters. A sound levelmeter may be a self-contained hand-held instrument with an attached microphone and a built-in display device. A sound level meter may be comprised of separate components in one ormore enclosures and may be capable of displaying a variety of acoustical signal levels. Soundlevel meters may include extensive analogue or digital signal processing, separately or incombination, with multiple analogue and digital outputs. Sound level meters may include general- purpose computers, recorders, printers, and other devices that form a necessary part of the complete instrument.1.6 Sound level meters may be designed for use with an operator present or for automaticand continuous measurements of sound level without an operator present. Specifications inthis standard for the response to sound waves apply without an operator present in the soundfield.

First published as AS Z37-1967 and AS Z38-1967.AS Z37-1967 revised and redesignated as AS 1259.1-1976.AS Z38-1967 revised and redesignated as AS 1259.2-1976.AS 1259.3 first published in 1976.AS 1259.1-1976, AS 1259.2-1976 and AS 1259.3-1976 revised, amalgamated and redesignated as AS 1259-1982.AS 1259-1982 revised and redesignated as AS 1259.1-1990 and AS 1259.2-1990.AS 1259.1-1990 and AS 1259.2-1990 revised, amalgamated and redesignated in part as AS IEC 61672.1-2004. First published as AS Z37-1967 and AS Z38-1967. AS Z37-1967 revised and redesignated as AS 1259.1-1976. AS Z38-1967 revised and redesignated as AS 1259.2-1976. AS 1259.3 first published in 1976. AS 1259.1-1976, AS 1259.2-1976 and AS 1259.3-1976 revised, amalgamated and redesignated as AS 1259-1982. AS 1259-1982 revised and redesignated as AS 1259.1-1990 and AS 1259.2-1990. AS 1259.1-1990 and AS 1259.2-1990 revised, amalgamated and redesignated in part as AS IEC 61672.1-2004.