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[7] Research findings suggest that a mid frequency (520 Hz) square wave output is significantly more effective at waking high-risk individuals. [7] More recent research suggests that strobe lights are not effective at waking sleeping adults with hearing loss and suggest that a different alarm tone is much more effective.
High-G, energy-sustaining turn. Head/head on (USAF) Target with an aspect of 160 to 180 degrees. (Naval) Target with an aspect of 0 to 20 degrees. Heads up Alert of an activity of interest. Heavy A group or package known to contain three or more entities. High Between 25,000 and 40,000 ft (7,600 and 12,200 m) above mean sea level (MSL). Hit(s)
Some fire alarm systems utilize emergency voice alarm communication systems (EVAC) [17] to provide prerecorded and manual voice messages. Voice alarm systems are typically used in high-rise buildings, arenas, and other large "defend-in-place" occupancies such as hospitals and detention facilities where total evacuation is difficult to achieve.
The horn and strobe on the 7001 and 7002 models are wired in series, causing the horn to produce a distinctive "skipping" sound when the strobe flashes, similar to the "March Time" code. In late 1984, Wheelock redesigned the horn's grilles, making them vandal resistant; and shortly thereafter, pigtail leads were discontinued.
The SpectrAlert series included horn strobes, strobes, remote horns, chimes, chime strobes, speakers, and speaker strobes. A main feature of these alarms was the ability to sync them using a System Sensor MDL sync module or the System Sensor sync protocol on a supported fire alarm control panel. Three years after the initial release of the ...
The strobe rate of fire alarms in schools, hospitals, stadiums, etc. for any emergency notification should be maintained between 1.0 - 2.0 Hertz as a seizure precaution. [ 16 ] Most strobe lights on sale to the public are factory-limited to about 10–12 Hz (10–12 flashes per second) in their internal oscillators , although externally ...
A high-intensity white strobe is used on structures that are taller than 700 feet (210 meters). These lights provide the highest visibility both day and night. Unlike a medium strobe, a high-intensity strobe does not provide 360° coverage; this requires the use of at least 3 high strobes at each level.
If older devices, such as earlier S-Quad and S-Cubed sounder and sounder strobe devices are on the loop, the loop cannot run in high power mode at 800ma, but these devices can still support a 2 km total loop span, where as older devices, such as the 3400, 32000, 34000 etc detectors and sounders cannot run on a loop with a total span longer than ...
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