Follow this sampling protocol:
- Inform the employee being monitored that the dosimeter should not interfere with his/her normal duties, and emphasize that the employee
should continue to work as usual.
- Explain the purpose of the dosimeter to each employee being sampled and emphasize that the dosimeter is not a speech recording device.
- Instruct the employee being sampled not to remove the dosimeter unless absolutely necessary and not to cover the microphone with a coat
or outer garment or move it from its installed position. Inform the employee when and where the dosimeter will be removed.
- The microphone should be located in the employee's hearing zone. OSHA defines the hearing zone as a sphere with a two-foot diameter
surrounding the head. Clip the microphone to the employee's clothing according to the manufacturer's instructions. Most manufacturers
recommend that the microphone be placed on the shoulder area midway between the head and the point of the shoulder. Practicality and safety
will dictate the actual microphone placement at each survey location.
- Use the microphone windscreen to protect the microphone when the wearer will be outdoors or in dusty or dirty areas. (The windscreen will
not protect the microphone from rain or extreme humidity).
- When noise levels at an employee's two ears are different, the higher level must be sampled for compliance determinations.
- Position and secure any excess microphone cable to avoid snagging or inconvenience to the employee. If practical, the cord should be
run under the employee's shirt or coat.
- Check the dosimeter periodically to ensure that the microphone is properly oriented.
- Obtain and note sound level meter readings during different phases of work the employee performs during the shift. There is no minimum
regarding the number of readings to obtain, but it is important to take enough readings to identify work cycles. For statistical reasons,
more readings should be taken when noise levels fluctuate widely.
- Record the information required on the OSHA-92 Noise Survey Report. [More...]