-
AS/NZS IEC 61672.1:2019 Electroacoustics - Sound level meters - Part 1: Specifications
Gives electroacoustical performance specifications for three kinds of sound measuring instruments: time-weighting sound level meters that measure exponential-time-weighted, frequency-weighted sound levels; integrating-averaging sound level meters that measure time-averaged, frequency-weighted sound levels; and integrating sound level meters that measure frequency-weighted sound exposure levels. Sound level meters specified in this standard are intended to measure sounds generally in the range of human hearing. Two performance categories, class 1 and class 2, are specified. Acceptance limits for class 2 are greater than, or equal to, those for class 1. This standard is applicable to a range of designs for sound level meters. Sound level meters may include extensive analogue or digital signal processing, separately or in combination, 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. Identical to and reproduced from IEC 61672-1:2013 Ed 2.0.
View product page
-
AS/NZS IEC 61672.2:2019 Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests
Provides details of the tests necessary to verify conformance to all mandatory specifications given in IEC 61672.1 for time-weighting sound level meters, integrating-averaging sound level meters, and integrating sound level meters. Pattern evaluation tests apply for each channel of a multi-channel sound level meter, as necessary. Tests and test methods are applicable to class 1 and class 2 sound level meters. The aim is to ensure that all laboratories use consistent methods to perform pattern evaluation tests. Identical with and reproduced from IEC 61672-2:2013 Ed 2.1.
View product page
-
AS/NZS IEC 61672.3:2019 Electroacoustics - Sound level meters - Part 3: Periodic tests
Describes procedures for periodic testing of time-weighting, integrating-averaging, and integrating sound level meters that were designed to conform to the class 1 or class 2 specifications of the second edition of IEC 61672.1. The aim of this standard is to ensure that periodic testing is performed in a consistent manner by all laboratories. The purpose of periodic testing is to ensure the user that the performance of a sound level meter conforms to the applicable specifications of IEC 61672.1 for a limited set of key tests and for the environmental conditions under which the tests were performed. Identical with and reproduced from IEC 61672-3:2013 (ED 2.0).
View product page
-
AS/NZS ISO 389.1:2019 Acoustics - Reference zero for the calibration of audiometric equipment - Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
Specifies a standard reference zero for the scale of hearing threshold level applicable to pure-tone air conduction audiometers, to promote agreement and uniformity in the expression of hearing threshold level measurements throughout the world. Identical with and reproduced from ISO 389-1:2017.
View product page
-
AS/NZS ISO 389.3:2019 Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators
Specifies the following data applicable to the calibration of bone vibrators for pure-tone bone-conduction audiometry: (a) reference equivalent threshold vibratory force levels (RETVFL), corresponding to the threshold of hearing of young otologically normal persons by bone-conduction audiometry; (b) essential characteristics of the bone vibrator and the method of coupling to the test subject, and to the mechanical coupler; and (c) essential characteristics of the masking noise and the baseline masking noise level applied to the ear not under test. Guidance on the practical application of this Standard in the calibration of audiometers is given in Annex B. Identical with and reproduced from ISO 389-3:2016.
View product page
