This is a preview - click here to buy the full publication IEC IEC 61672-1 Edition 2.02013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics-Soundlevel meters- Part 1: Specifications Electroacoustique-Sonometres- Partie 1: Specifications INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE PRICECODE XA CODEPRIX ICS 17.140.50 ISBN 978-2-8322-1087-1 Warning!Make sure that you obtained this publication from an authorized distributor. Attention!Veuillezvous assurer que vous avez obtenu cette publication via un distributeuragree. ? Registered trademark of the International Electrotechnical Commission Thisisapreview-clickheretobuythefull publication - 2 - 61672-1@IEC:2013 CONTENTS FOREWORD. INTRODUCTION. .6 1 Scope 2 Normative references. 3 Terms and definitions. 4 Referenceenvironmentalconditions Performance specifications.... 5 .14 5.1 General. 5.2 Adjustmentsatthe calibration checkfrequency 17 5.3 Corrections to indicated levels. 5.3.1 General... 5.3.2 Reflections and diffraction ... 17 5.3.3 Windscreens...... 5.3.4 Format for correction data .... 5.3.5 Corrections for use during periodic testing. .19 19 5.4 Directional response.. 5.5 Frequency weightings... .20 5.6 Level linearity.... .23 5.7 Self-generated noise .. .24 5.8 Time-weightings F and S. 5.9 Toneburst response.... 5.10 Responsetorepeatedtonebursts. .26 5.11 Overload indication .27 5.12 Under-range indication. .27 5.13 C-weighted peak sound level. 27 5.14 Stability during continuous operation .28 5.15 High-level stability . .28 5.16 Reset. 5.17 Thresholds . 5.18 Display.. 5.19 Analogue or digital output.. .29 5.20 Timing facilities .. ...30 5.21 Radio frequency emissions and disturbances to a public power supply.. ..30 5.22 Crosstalk 5.23 Power supply.. Environmental, electrostatic,and radio-frequency requirements 6 ..32 6.1 General ....32 6.2 Static pressure. 6.3 Airtemperature 6.4 Humidity ... 6.5 Electrostaticdischarge.. ..33 6.6 A.C.power-frequency and radio-frequency fields.... ..33 6.7 Mechanical vibration... .34 7 Provisionfor use withauxiliarydevices .35 Marking 8 35 9 Instruction Manual ..35 This is a preview - click here to buy the full publication 61672-1@IEC:2013 - 3 - 9.1 General .35 9.2 Information for operation . .36 9.2.1 General ..36 9.2.2 Design features . 9.2.3 Power supply..... ....37 9.2.4 Adjustments at the calibration check frequency . 9.2.5 ..37 Correctionstoindicatedlevels... 9.2.6 Operating the sound level meter ... ..37 9.2.7 Accessories.... .38 9.2.8 Influence of variations in environmental conditions .... 9.3 Information for testing AnnexA(informative)Relationshipbetweentolerance interval,corresponding acceptance interval and the maximum-permitted uncertainty of measurement ...41 Annex B (normative)Maximum-permitted uncertainties of measurement.. AnnexC(informative)Exampleassessments of conformanceto specifications ofthis standard.... .44 Annex D (normative)Frequencies at fractional-octave intervals 47 Annex E(normative) Analytical expressions for frequency-weightings C,A,and Z... ...49 Figure 1-Principal steps involved in forming a time-weighted sound level .10 Figure A.1-Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement ...... .41 Figure C.1- Examples of assessment of conformance ...46 Table 1-Acceptancelimitsforthedifferencebetweenameasured windscreen correction and the corresponding correction given in the Instruction Manual.. .18 Table 2-Acceptance limits for deviations of directional response from the design goal ......20 Table3-Frequencyweightings and acceptancelimits. ...22 Table4-Reference4kHztoneburst responsesandacceptance limits ..25 Table 5-Reference differences for C-weighted peak sound levels and acceptance limits.. ...28 Table 6-Limits forconducted disturbance tothe voltage of a public supply of electric power ..31 Table B.1- Maximum-permitted uncertainties of measurement for a coverage probabilityof 95