Harbor Freight Tools Noise Canceling Electronic Ear Muffs Product manual
Contents
1. ELECTRONIC EARMUFFS ITEM 92851 The EPA has selected the NRR as the measure of a hearing protector s noise reducing capabilities Harbor Freight Tools makes no warranties as to the suitability of the NRR as a measure of actual workplace protection since such protection is highly dependent on user training motivation and utilization A better estimate of workplace protection can be obtained by derating the labeled NRR by 50 The NRR calculated from this attenuation data is 24 Improper fit of this device will reduce its effectiveness in attenuating noise Consult instructions for proper fit The level of noise entering a person s ear when a hearing protector is worn as directed is closely approximated by the difference between the A weighted environmental noise and the NRR ATTENUATION DATA ANSI S3 19 1974 NRR without Testy 125 250 500 1000 2000 3150 4000 6300 8000 4ocFRe11 ee Frequencies Hz correction Mean Attenuation dB IO Sandard Deviation dB d E s ji Example 1 The environmental noise level as measured at the ear is 92 dBA 2 The NRR is 24 decibels dB 3 The level of noise entering the ear is approximately equal to 68 dBA CAUTION For noise environments dominated by frequencies below 500 Hz the C weighted environmental noise level should be used The NRR used in the above example was achieved under laboratory conditions Although hearing protectors can be recommended for p2. rotection against harmful effects of impulsive noise the Noise Reduction Rating NRR is based on the attenuation of continuous noise and may not be an accurate indicator of the protection attainable against impulsive noise such as gunfire Wear Instructions 1 Turn the knob on the earmuff to the ON position Make certain that the light inside the earmuff illuminates if the light does not illuminate correctly install properly charged AA batteries before use 2 Adjust the band to the proper position 3 Pull hair out of the way and out from beneath the muffs 4 Adjust the height of the cups so they fully enclose the ears and the cushions press equally around the ear 5 Itis important that cushions seal completely around the ear 6 Always wear ANSI approved safety glasses when working with tools and equipment When using these ear muffs with safety glasses safety glasses must have thin temples that fit closely around the head or thin straps this will help ensure a better fit and better protection To Change The Batteries Open the earmuff s case inserting a coin into the slot in the base and turning it Install new batteries in the same orientation as the old ones Change both batteries at the same time and with the same type Securely reclose the cover before use
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