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.
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AS/NZS IEC 61672.1:2019 Sound level meters Specifications
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Reference environmental conditions
5 Performance specifications
5.1 General
5.2 Adjustments at the calibration check frequency
5.3 Corrections to indicated levels
5.3.1 General
5.3.2 Reflections and diffraction
5.3.3 Windscreens
5.3.4 Format for correction data
5.3.5 Corrections for use during periodic testing
5.4 Directional response
5.5 Frequency weightings
5.6 Level linearity
5.7 Self-generated noise
5.8 Time-weightings F and S
5.9 Toneburst response
5.10 Response to repeated tonebursts
5.11 Overload indication
5.12 Under-range indication
5.13 C-weighted peak sound level
5.14 Stability during continuous operation
5.15 High-level stability
5.16 Reset
5.17 Thresholds
5.18 Display
5.19 Analogue or digital output
5.20 Timing facilities
5.21 Radio frequency emissions and disturbances to a public power supply
5.22 Crosstalk
5.23 Power supply
6 Environmental, electrostatic, and radio-frequency requirements
6.1 General
6.2 Static pressure
6.3 Air temperature
6.4 Humidity
6.5 Electrostatic discharge
6.6 A.C. power-frequency and radio-frequency fields
6.7 Mechanical vibration
7 Provision for use with auxiliary devices
8 Marking
9 Instruction Manual
9.1 General
9.2 Information for operation
9.2.1 General
9.2.2 Design features
9.2.3 Power supply
9.2.4 Adjustments at the calibration check frequency
9.2.5 Corrections to indicated levels
9.2.6 Operating the sound level meter
9.2.7 Accessories
9.2.8 Influence of variations in environmental conditions
9.3 Information for testing
Annex A (informative) Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement
Annex B (normative) Maximum-permitted uncertainties of measurement
Annex C (informative) Example assessments of conformance to specifications of this standard
Annex D (normative) Frequencies at fractional-octave intervals
Annex E (normative) Analytical expressions for frequency-weightings C, A, and Z
Figures
Figure 1 – Principal steps involved in forming a time-weighted sound level
Figure A.1 – Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement
Figure C.1 – Examples of assessment of conformance
Tables
Table 1 – Acceptance limits for the difference between a measured windscreen correction and the corresponding correction given in the Instruction Manual
Table 2 – Acceptance limits for deviations of directional response from the design goal
Table 3 – Frequency weightings and acceptance limits
Table 4 – Reference 4 kHz toneburst responses and acceptance limits
Table 5 – Reference differences for C-weighted peak sound levels and acceptance limits
Table 6 – Limits for conducted disturbance to the voltageof a public supply of electric power
Table B.1 – Maximum-permitted uncertainties of measurement for a coverage probability of 95 %
Table C.1 – Examples of assessment of conformance
Table D.1 – Frequencies at one-third-octave intervals
Table D.2 – Frequencies at one-sixth-octave intervals
Table D.3 – Frequencies at one-twelfth-octave intervals
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AS/NZS IEC 61672.1:2019 Sound level meters Specifications
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Reference environmental conditions
5 Performance specifications
5.1 General
5.2 Adjustments at the calibration check frequency
5.3 Corrections to indicated levels
5.3.1 General
5.3.2 Reflections and diffraction
5.3.3 Windscreens
5.3.4 Format for correction data
5.3.5 Corrections for use during periodic testing
5.4 Directional response
5.5 Frequency weightings
5.6 Level linearity
5.7 Self-generated noise
5.8 Time-weightings F and S
5.9 Toneburst response
5.10 Response to repeated tonebursts
5.11 Overload indication
5.12 Under-range indication
5.13 C-weighted peak sound level
5.14 Stability during continuous operation
5.15 High-level stability
5.16 Reset
5.17 Thresholds
5.18 Display
5.19 Analogue or digital output
5.20 Timing facilities
5.21 Radio frequency emissions and disturbances to a public power supply
5.22 Crosstalk
5.23 Power supply
6 Environmental, electrostatic, and radio-frequency requirements
6.1 General
6.2 Static pressure
6.3 Air temperature
6.4 Humidity
6.5 Electrostatic discharge
6.6 A.C. power-frequency and radio-frequency fields
6.7 Mechanical vibration
7 Provision for use with auxiliary devices
8 Marking
9 Instruction Manual
9.1 General
9.2 Information for operation
9.2.1 General
9.2.2 Design features
9.2.3 Power supply
9.2.4 Adjustments at the calibration check frequency
9.2.5 Corrections to indicated levels
9.2.6 Operating the sound level meter
9.2.7 Accessories
9.2.8 Influence of variations in environmental conditions
9.3 Information for testing
Annex A (informative) Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement
Annex B (normative) Maximum-permitted uncertainties of measurement
Annex C (informative) Example assessments of conformance to specifications of this standard
Annex D (normative) Frequencies at fractional-octave intervals
Annex E (normative) Analytical expressions for frequency-weightings C, A, and Z
Figures
Figure 1 – Principal steps involved in forming a time-weighted sound level
Figure A.1 – Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement
Figure C.1 – Examples of assessment of conformance
Tables
Table 1 – Acceptance limits for the difference between a measured windscreen correction and the corresponding correction given in the Instruction Manual
Table 2 – Acceptance limits for deviations of directional response from the design goal
Table 3 – Frequency weightings and acceptance limits
Table 4 – Reference 4 kHz toneburst responses and acceptance limits
Table 5 – Reference differences for C-weighted peak sound levels and acceptance limits
Table 6 – Limits for conducted disturbance to the voltageof a public supply of electric power
Table B.1 – Maximum-permitted uncertainties of measurement for a coverage probability of 95 %
Table C.1 – Examples of assessment of conformance
Table D.1 – Frequencies at one-third-octave intervals
Table D.2 – Frequencies at one-sixth-octave intervals
Table D.3 – Frequencies at one-twelfth-octave intervals
AS/NZS IEC 61672.1:2019
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.