This feature may be added to many exit sign and emergency light fixtures, the SDT feature prolongs battery life, and reduced man hours required OSHA tests. Self testing diagnostic automatically executes a 15 minute test every 30 days and runs a 90 minutes test once per year. The major reasons batteries typically fail is because they remain dormant for long periods of time. With the SDT feature automatically simulates a full discharge and full recharge to keep the batteries in peak performance. If any problems arise during this testing process it will report them through the user interface. This benefit drastically reduces man hours required by OSHA to manually perform the tests.
Emergency light ballasts are devices that allow normal fluorescent lights to double as an emergency light by providing battery power to one or two lamps after electrical power is lost. These ballasts operate for a minimum of 90 minutes in a situation where electricity is lost, the same length of time that emergency lighting fixtures normally operate.
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