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Part 1 METHOD OF DETERMINING AIRBORNE NOISE EMITTED BY LAWNMOWERS (ALSO REFERRED TO AS MOWERS IN THIS SCHEDULE)

Original text. Later amendments are not shown.

If, for any measurement, instruments other than a precision sound level meter or combinations of instruments, such as integrators are used, all the specifications of such instruments shall comply with the relevant requirements of IEC publication 651, first edition, 1979.

  1. 1OBJECT
  2. 2SCOPE
  3. 2.1Type of noise
  4. 2.2Size of sound source
  5. 3DEFINITIONS
  6. 3.1Sound pressure level LpA
  7. 3.2Measuring surface
  8. 3.3Surface sound pressure level LpAM
  9. 3.4Sound power level LWA is obtained by applying the weighting A to the sound power level LW.
  10. 3.5Limit value of the sound power level LWA1
  11. 3.6Directivity index (DI)
  12. 3.7Extraneous noise
  13. 3.7.1Background noise
  14. 3.7.2Parasitic noise
  15. 4CRITERIA TO BE USED FOR EXPRESSING RESULTS
  16. 4.1Acoustic criteria for the environment
  17. 5MEASURING INSTRUMENTS
  18. 5.1General
  19. 5.2Measuring instruments
  20. 5.3Microphone with cable
  21. 5.4Weighting network
  22. 5.5Inspection of the measuring apparatus
  23. 5.5.1Inspection of the measuring apparatus
  24. 5.5.2Inspection of the measuring apparatus
  25. 6MEASURING CONDITIONS
  26. 6.1Purpose of the measurement
  27. 6.1.1Purpose of the measurement
  28. 6.1.2Purpose of the measurement
  29. 6.1.3Purpose of the measurement
  30. 6.2Operation of the sound source during measurement
  31. 6.3Measuring site
  32. 6.3.1General
  33. 6.3.2Measurements in the open air on artificial flooring
  34. 6.3.3Measurements in the open air on grass
  35. 6.3.4Measurements indoors
  36. 6.4Measuring surface, measuring distance, location and number of measuring points
  37. 6.4.1Measuring surface
  38. 6.4.2Location and number of measuring points
  39. 6.4.2.1General
  40. 6.4.2.2Position of the measuring points on a hemisphere of radius r
  41. 7MEASUREMENTS
  42. 7.1Measurement of the acoustic properties of the measuring site
  43. 7.1.1Extraneous noise
  44. 7.1.2Wind speed and direction
  45. 7.1.3Measurement of temperature, humidity, barometric pressure and other disturbances
  46. 7.1.4Acoustic quality of the test area
  47. 7.1.5Presence of obstacles
  48. 7.2Measurement of the sound pressure level LpA
  49. 7.3Determination of the nature of the noise generated by the sound source
  50. 7.3.1Detection of noise of an impulsive character
  51. 7.3.2Detection of a noise with discrete tones
  52. 8USE OF RESULTS
  53. 8.1Calculation of root mean square values
  54. 8.1.1Root mean square value at a measuring point
  55. 8.1.2Root mean square value on the measuring surface
  56. 8.2Calculation of average extraneous noise level
  57. 8.3Calculation of the area S of the measuring surface
  58. 8.4Calculation of the surface sound pressure level LpAm
  59. 8.5Calculation of the sound power level LWA
  60. 8.6Corrections to be made to measurements
  61. 8.6.1Extraneous noise
  62. 8.6.2Acoustic properties of test area
  63. 8.6.3Disturbances: temperature, humidity, altitude of site, etc.
  64. 8.6.4Wind interference
  65. 9DATA TO BE RECORDED
  66. 9.1Sound source under test
  67. 9.2Acoustic environment
  68. 9.3Instrumentation
  69. 9.4Acoustic data
  70. 10DATA TO BE INCLUDED IN THE REPORT LAID DOWN IN SECTION 9
  71. 11METHOD OF CALCULATING THE AVERAGE LEVEL CORRESPONDING TO THE ROOT MEAN SQUARE VALUE OF THE VARIOUS SOUND PRESSURE LEVELS
  72. ANNEX AARTIFICIAL FLOORING
  73. ANNEX BARTIFICIAL FLOORING