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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 ...
[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.
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.
Category 2 systems provide fire detection in specified parts of the building where there is either high risk or where business disruption must be minimized. L1 A category L1 system is designed for the protection of life and which has automatic detectors installed throughout all areas of the building (including roof spaces and voids) to provide ...
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 ...
Autocall was founded in 1908 by two businessmen from Shelby Electric Company after they witnessed a demonstration of a unique telegraph system in use at a plant for employee communication while on a business trip. Seeing the need for such a system at their own company, the two designed an automatic version of this system and founded Autocall.
Other applications are in alarm systems, emergency vehicle lighting, theatrical lighting (most notably to simulate lightning), and as high-visibility aircraft collision avoidance lights. They are still widely used in law enforcement and other emergency vehicles, though they are slowly being replaced by LED technology in this application, as ...
That is, the strobe continues to toggle whether there is data being transferred or not. Another variation is the sharing of the same bus to transfer the strobe. In this case the strobe can only be transferred by the device that is sending the data and may require transmission of pre-ambles and post-ambles to indicate the start and end of the ...