| 摘要 |
A remotely controlled test system for testing the ready status of a fluorescent type emergency lighting fixture providing a 30 second or a 90 minute test of the battery operated fluorescent lamp upon command. The transmitted control signal is an infrared beam containing a selected pulse-time code which the receiving circuit can reliably receive, recognize and process in an environment of high infrared noise typically produced by fluorescent lighting. Upon recognition and verification of the selected pulse-time code, the microcontroller disenables the charging circuit to the battery for supplying power to the fluorescent lamp in the emergency mode to cause the emergency circuit to sense an AC power failure whereby the lamp illuminates in the emergency mode for the selected test period. In preferred embodiments the detector for the infrared beam, the housing in which it is mounted in the fluorescent fixture, the cable connecting the detector to the microcontroller are all surrounded with an electrically conductive shielding which is grounded to the microcontroller.
|
