AS 1259.1-1990

1 - AS 1259.1-1990 SOUND LEVEL METERS - NON-INTEGRATING
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE.
6 - 2 REFERENCED DOCUMENTS.
6 - 3 DEFINITIONS.
6 - 3.1 Weighted sound pressure level
6 - 3.2 Crest factor
6 - 3.3 Primary indicator range
6 - 3.4 Level linearity
6 - 3.5 Reference direction
6 - 3.6 Reference frequency
6 - 3.7 Reference sound pressure level
6 - 3.8 Reference range
6 - 3.9 Tone burst
7 - 4 DESIGNATION.
7 - 4.1 Types.
7 - 4.2 Tolerances.
7 - 4.3 Weighting characteristics.
7 - 4.3.1 Frequency weighting.
7 - 4.3.2 Time weighting.
7 - 4.4 Optional features.
7 - 5 GENERAL CHARACTERISTICS OF SOUND LEVEL METERS.
7 - 5.1 General.
7 - 5.2 Accuracy and calibration.
8 - 5.3 Directional characteristics.
8 - 5.4 Frequency weighting.
8 - 5.5 Time weighting.
8 - 5.6 Sensitivity to various environments.
8 - 5.7 Means for substitution of electrical signal.
8 - 5.8 Means for checking battery voltage.
8 - 5.9 Maximum change of reading during operation.
8 - 6 DIRECTIONAL CHARACTERISTICS OF THE MICROPHONE AND INSTRUMENT CASE.
8 - 7 FREQUENCY- WEIGHTING AND AMPLIFIER CHARACTERISTICS.
8 - 7.1 General.
8 - 7.2 Manual level range control.
8 - 7.3 Crest factor capacity.
12 - 7.4 Inherent weighted system noise level.
12 - 7.5 Total harmonic distortion.
12 - 7.6 Adjustable range controls.
12 - 7.7 Non-linear distortion.
12 - 8 DETECTOR AND INDICATOR CHARACTERISTICS.
12 - 8.1 General.
12 - 8.2 F and S Characteristics.
12 - 8.3 I Characteristics.
14 - 8.4 Indication accuracy.
14 - 8.5 P Characteristics.
14 - 8.6 Indicator range.
14 - 8.7 Indicator scale.
14 - 8.8 Digital indicator display.
14 - 8.9 Detector-indicator linearity.
14 - 8.10 Differential level linearity.
14 - 9 SENSITIVITY TO VARIOUS ENVIRONMENTS.
14 - 9.1 General.
14 - 9.2 Static pressure.
14 - 9.3 Sound fields (microphone removed).
14 - 9.4 Mechanical vibrations.
16 - 9.5 Magnetic and electric fields.
16 - 9.6 Temperature.
16 - 9.7 Humidity.
16 - 10 CALIBRATION AND CHECKS OF THE BASIC CHARACTERISTICS OF SOUND LEVEL METERS.
16 - 10.1 General.
16 - 10.2 Complete meter.
16 - 10.2.1 General.
17 - 10.2.2 Absolute sensitivity.
17 - 10.2.3 Frequency weighting.
17 - 10.2.4 Directivity.
17 - 10.3 Amplifier characteristics.
17 - 10.3.1 General.
17 - 10.3.2 Overload indications.
17 - 10.3.3 Accuracy of level range control.
17 - 10.3.4 Inherent weighted system noise level.
17 - 10.4 Detector and indicator characteristics.
17 - 10.4.1 General.
17 - 10.4.2 Time-weighting characteristics F and S.
18 - 10.4.3 Time-weighting characteristic I.
18 - 10.4.4 Time-weighting characteristic P.
18 - 10.4.5 R.M.S. performance.
19 - 11 PROVISION FOR USE WITH AUXILIARY EQUIPMENT.
19 - 12 RATING INFORMATION AND INSTRUCTION MANUAL.
19 - 12.1 Marking.
19 - 12.2 Instruction Manual.
21 - APPENDIX A - SPECIFICATIONS OF THE A, B, C AND D FREQUENCY WEIGHTING FUNCTIONS
21 - A1 POLE-ZERO SPECIFICATIONS.
21 - A2 EXPLICIT EQUATIONS FOR THE WEIGHTING FUNCTIONS FOR COMPUTATION.
26 - APPENDIX B - TESTS OF THE OVERLOAD AND DETECTION CHARACTERISTICS
26 - B1 GENERAL.
26 - B2 RECTANGULAR PULSE TEST.
26 - B3 TONE BURST TEST.
27 - APPENDIX C - DIFFUSE FIELD SENSITIVITY
27 - APPENDIX D - THEORETICAL RESPONSE TO TONE BURSTS
28 - ANNEX - DEVIATIONS FROM IEC 651–1979, SOUND LEVEL METERS

Provides for four types of meter, viz. Types 0 and 1 for laboratory and precision use, Type 2 for general field applications, and Type 3 for field noise survey applications, with one or more frequency-weighting characteristics A, B and C and one or more time-weighting characteristics S, F, I and P. Specifies the directional frequency-weighting and amplifier, time-weighting, detector and indicator characteristics, and sensitivity to various environments, and includes electrical and acoustical tests. Is technically equivalent to IEC 651 and includes an annex showing deviations from IEC 651.

This Standard specifies requirements for sound level meters for the measurement of certain frequency-weighted and time-weighted sound pressure levels. This Standard specifies the following characteristics of sound level meters: (a) Directional characteristics.(b) Frequency-weighting characteristics.(c) Time-weighting, detector and indicator characteristics. (d) Sensitivity to various environments.It also sets out electrical and acoustical procedures to verify compliance with the characteristics specified and describes the method for absolute sensitivity calibration.