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Impulse Assessment of the ComTac V Hearing Defender Headset and the ESS Crossbow One Clear Eyewear
The impulse peak insertion loss (IPIL) is the standard measure of attenuation provided by hearing protection devices (HPDs) in response to an impulsive noise. This technical memorandum describes the IPIL testing conducted on a combined configuration that included the ESS Crossbow eyewear and the ComTac V Headset. Testing included two test modes for the ComTac V: passive and active. In all occluded conditions, the ComTac V and Crossbow were donned. Testing was completed in accordance with the ANSI standard S12.42-2010. All device samples were tested at the nominal levels of 150, 160, and 170 decibel peak (dBP, re: 20 Pa). A total of five samples were fitted to an acoustic test fixture two times each for a total of 10 trials per test level in both the passive and active test modes. Results suggest that the ComTac V Headset, when functioning properly and fitted in combination with the Crossbow can adequately protect against impulses below 152.2 dBP in the passive test mode, and 152.8 dBP in the active test mode.
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