hct Hearing Conservation Training 听力保护培训(全英文).ppt

* * * * * * * * * * * .” * * * * * * * * * * * * “The blue x’s are one ear, the green circles are the other ear. The hearing loss shown in these audiograms is in the higher frequencies which is commonly caused by exposure to excessive noise.” [examples of audiograms used at your company can be shown here. You can also discuss here how audiometric testing is provided at your company.] Ear muffs cover the whole ear and are preferred by some people. They have replaceable pads and some high-tech styles filter out specific noise pitches. They last longer than most plugs. Ear Muffs Some muffs are attached to hard hats or goggles. Some high-tech muffs can filter out certain frequencies or have radios inside for communication in high noise areas. Attached Earmuffs Muffs can be uncomfortable in hot weather. Muffs don’t seal well for someone with glasses or heavy sideburns. Ear Muff Comfort Glasses Ear caps are like earplugs, except they do not go into the ear canal, they only block it. They are good for occasional use or for people who find earplugs uncomfortable. They are not as protective as earplugs or muffs. Ear Caps The “noise reduction rating” or “NRR” of hearing protection is measured in decibels. The NRR is found on the earmuff or earplug package. The higher the number, the greater the protection. Noise Reduction of Hearing Protection Using earmuffs or plugs in noisy areas can actually make it easier to hear coworkers or machinery. They reduce overwhelming loud background noise. They are similar to dark glasses that reduce the sun’s glare making it easier to see. How can you hear anything with earmuffs on? Earmuffs and plugs provide good protection only when used properly. Sometimes people will remove hearing protection for “just a minute” in a noisy area. In areas of very high noise exposure, this could result in noise overexposure. Proper Use of Hearing Protection It won’t protect your ears if it is around your neck!!! Instructions on