Electrical fault indicator

G - Physics – 01 – R

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324/58.2

G01R 31/08 (2006.01) G06F 11/00 (2006.01) G06F 11/16 (2006.01) G06F 11/28 (2006.01)

Patent

CA 1038040

AN ELECTRICAL FAULT INDICATOR ABSTRACT OF THE DISCLOSURE A method and apparatus for indicating a malfunction in the normal operation and operating components of electrical apparatus. A predetermined coded output is generated period- ically in response to the proper operation of the apparatus being monitored. The coded output is conveyed to a decoder network which deciphers the input signal and provides a symbolic output for identifying the reception of the coded output. A timer operable to sequence through a predetermined time interval generates an output during the interval which is reinitiated in response to the symbolic output of the decoder network. In addition, means are provided for supplying a fault output, which is inhibited during the interval of the timer output. The timer interval is desirably selected to be greater than the interval between generation of the coded out- put so that a fault output is inhibited so long as the apparatus is properly operating. If for any reason, the decoder network fails to identify the reception of the coded output within the timer interval a fault output signal is conveyed representative of a malfunction in the monitored apparatus. The invention is ideally applicable to digital processing and information transmission systems wherein the coded output is preferably designed to exercise all states of the data and address lines of the communication busses.

237249

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