Measurement should be taken 1 to 3 metres from source (not directly at the source). Noise levels generated by a particular source Only useful when work can be easily divided into defined activities and noise levels are relatively stable all the time. If noise levels vary considerably, it is difficult to determine average exposure. If the worker is mobile, it may be difficult to determine a personal exposure, unless work can be easily divided into defined activities. Most accurate for personal noise exposures, and is worn by the worker. Table 1 provides some instrument selection guidelines. The user's manual provided by the instrument manufacturer provides most of this information. It is important that you understand the calibration, operation and reading the instrument you use. The most common instruments used for measuring noise are the sound level meter (SLM), the integrating sound level meter (ISLM), and the noise dosimeter. What types of instruments are used for measuring noise? Back to top However, noise dosimetry (such as personal noise exposure measurements) is necessary if the workplace noise levels vary throughout the day or if the workers are fairly mobile. If the workplace noise remains steady, workers are stationary throughout the shift, and measurements are representative of a typical day, the noise survey data can be used to determine if there is a potential exposure to harmful noise levels and if additional measurements are required. The second step is to determine personal noise exposure levels that is, the amount of noise to which individual employees are exposed. The initial measurements are noise surveys to determine if: Conditions during both a typical and atypical shift (noise sources, activities, shift length, etc.).The temporal pattern of noise - continuous, variable, intermittent, impulse.The sources of noise, and times when the sources are operating.The purpose of measurement: compliance with noise regulations, hearing loss prevention, noise control, community annoyance etc.The person making the measurement must understand: What things do you consider when planning noise measurement? Back to topīefore taking field measurements, it is important to determine the type of information required. Noise measurement data from studies in similar situations are very helpful in assessing the potential noise problem. People hear a ringing or humming noise when they leave work.After working for a few years at that workplace, employees find it difficult to communicate in a crowd or party situation where there are other sounds or many voices.At the end of work shift people have to increase the volume of their radio or TV to a level too loud for others.People have to raise their voice to talk to someone at one metre (3 feet) away.Noise is louder than busy city traffic.The indicators of potentially hazardous noise level include: The first step is to determine whether or not noise is a potential problem in your workplace. How do you identify noise problems in the workplace? Back to top For details, you should consult the current version of the Canadian Standard CSA Z107.56-13 (R2018) or the standard that applies in your jurisdiction. This document briefly outlines the steps involved in the noise measurement. However, the first step is to determine if there is a noise problem in the workplace. The choice depends on the workplace noise and the information needed. Various instruments and techniques may be used. How is workplace noise measured? Back to topįor occupational hygiene purposes, the sound pressure level is measured to determine noise exposures. This information also helps determine appropriate noise control measures that need to be put in place. It helps identify work locations where there are noise problems, employees who may be exposed to noise levels that can cause hearing loss, and where additional noise measurements need to be made. Measuring noise levels and workers' noise exposures is the most important part of a workplace hearing conservation and noise control program. Why measure noise in the workplace? Back to top You are here: Noise - Measurement of Workplace Noise
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