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Sound Level Monitoring

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Guide to Sound Level Measurement


Minimum specifications for popular applications:


Noise at work Measurements

  • Full compliance with IEC 61672:2002  (at least Class 2), or IEC 60651:1979 (at least type 2)
  • Readings in dB(A) and dB(C)
  • Measurements in Leq or Lex or L EP,d
  • Peak (Pmax or Ppeak), ideally simultaneously to the above
     Feild
    Calibrator, same class as instrument

Alarm Testing

  • Readings in dB(A)
  • Maximum hold (Lmax)

Machinery Regulations

  • Full compliance with IEC 61672:2002 (Class 1 or 2), or IEC 60651:1979 (Type 1 or 2)
  • Readings in dB(A)
  • Average level (Leq)
  • Calibration

Engineering

  • Full compliance with IEC 61672:2002 (Class 1 or 2), or IEC 60651:1979 (Type 1 or 2)
  • Readings in dB(A)
  • Maximum hold (Lmax)
  • Calibration

 


Guide to noise levels


Noise Level dB(A)               Example

50-60                                     Normal conversation

65-75                                     Loud radio

78-85                                     Busy street

100                                         Light tractors, Electric hand tools, Light garden machinery

85-120                                   General manufacturing industry

100-120                                 Heavy tractors, Steel construction, Road construction

120-130                                 Forestry equipment, chainsaws, textile industry, paper and paining works, heavy plant, pneumatic drills

120-150                                 Airports, jet engines, motor sports



Guide to Exposure Levels

 

dB Noise Level               Exposure Time

85                           8 hours

88                           4 hours

94                           1 hour

100                        15 minutes

115                        47 seconds

121                        14 seconds

130                        1.75 seconds

 

An increase of 3dB halves the exposure time

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