AS/NZS IEC 61672.1:2019

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