BS EN 62585:2012

INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Reference environmental conditions
5 Uncertainties of measurement
6 General requirements for measurement of
   adjustment value and corrections
7 Submission and inspection
8 Determination of the adjustment value at
   the calibration check frequency
9 Determination of corrections for the typical
   effects of reflections from the case of the sound
   level meter and diffraction of sound around the
   microphone
10 Determination of corrections for the deviation
   of the microphone free-field frequency response
   from a uniform frequency response
11 Determination of corrections for the use of
   windscreens and similar accessories
12 Determination of corrections over a range of
   frequencies when a sound calibrator is recommended
   for use by the sound level meter manufacturer
13 Determination of corrections over a range of
   frequencies when a comparison coupler is
   recommended for use by the sound level meter
   manufacturer
14 Determination of corrections over a range of
   frequencies when an electrostatic actuator is
   recommended for use by the sound level meter
   manufacturer
15 Documentation
Annex A (normative) - Calibration check frequency
        - Determination of the adjustment value
Annex B (normative) - Determination of the effects
        of reflections from the case of the sound level
        meter and diffraction of sound around the
        microphone
Annex C (normative) - Determination of the effects
        of the use of windscreens and similar accessories
Annex D (informative) - Determination of corrections
        for use with sound calibrators to determine
        equivalent free-field response at all frequencies
        of interest
Annex E (informative) - Determination of corrections
        for use with comparison couplers to determine
        equivalent free-field frequency response at all
        frequencies of interest
Annex F (informative) - Determination of corrections
        for use with electrostatic actuators to determine
        equivalent free-field frequency response at all
        frequencies of interest
Annex G (informative) - Comparison techniques
Annex H (informative) - Exact one-twelfth-octave
        frequencies
Annex I (informative) - Example calculations of
        expanded uncertainty of measurement
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Gives information on the corrections required over a range of frequencies in order for a periodic test of a sound level meter to be performed according to IEC 61672-3.

IEC 62585:2012 provides information on the corrections required over a range of frequencies in order for a periodic test of a sound level meter to be performed according to IEC 61672-3. These corrections include; corrections for the typical effects of reflections from the case of the sound level meter and diffraction of sound around the microphone; corrections for the deviation of the typical microphone frequency response from a uniform frequency response, where the actual microphone response cannot be measured; and corrections for the influence on the frequency response of a typical microphone of a specified windscreen and any other accessory that is part of the configuration for normal use of the particular sound level meter submitted for testing. This International Standard includes discussion about uncertainties of measurement of the required corrections. In some instances a maximum permitted expanded uncertainty for the manufacturer or testing laboratory is given. The aim of this International Standard is to ensure that the adjustment value at the calibration check frequency and all corrections are determined using consistent and appropriate methods. It is intended that this International Standard will be used by manufacturers to determine adjustment values and corrections, by laboratories performing pattern evaluation tests according to IEC 61672-2, and by laboratories performing periodic tests according to IEC 61672-3. Laboratories performing periodic tests according to IEC 61672-3 will also need to consult this International Standard to ensure that the expanded uncertainties of measurement for the corrections quoted by the manufacturer do not exceed the maximum permitted values.