Transcription of 6 SOUND MEASURING INSTRUMENTS - WHO
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6 SOUND MEASURING INSTRUMENTS - WHO
Figure SOUND level meter block diagram6 SOUND MEASURING INSTRUMENTSP rofessor J. MalchaireUnit Hygi ne et Physiologie du TravailUniversit Catholique de Louvain (UCL)Clos Chapelle-aux-Champs 3038B-1200 INTRODUCTIONThis chapter describes the noise MEASURING INSTRUMENTS most widely used in the practice ofoccupational hygiene. The planning, the strategy and the practical aspects of a noise survey arediscussed in Chapter types of MEASURING systems can be used for the measurement of SOUND depending onthe purpose of the study, the characteristics of SOUND and the extent of information that is desiredabout the SOUND . The various elements in a MEASURING system are:a. the transducer; that is, the microphone;b. the electronic amplifier and calibrated attenuator for gain control;c. the frequency weighting or analyzing possibilities;d. the data storage facilities;e. the all elements are used in every MEASURING system.
plates and no external polarising voltage. This type of microphone is less sensitive to dirt and moisture than the condenser microphone with a polarisation voltage. The last type is a microphone where the membrane is connected to a coil, centred in a magnetic field, and whose movements, triggered by the mechanical fluctuations of the membrane,
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