Self-testing computer monitor

Details Self-testing computer monitor Self-testing computer monitor

G - Physics

05

B

354/23

G05B 23/02 (2006.01)

Patent

CA 1167964

-16- SELF-TESTING COMPUTER MONITOR Abstract Of The Disclosure The purpose of this monitor is to detect a failure in either the computer or the monitor itself The computer supplies an output to the monitor which toggles at a preselected first frequency. The moni- tos includes a mechanism for sensing if the output of the computer is toggling at a frequency outside a pre- selected range of frequencies. A test circuit gener- ates periodic test pulses and a clock circuit gener- ates timing pulses, A latching, mechanism changes from a first state to a second state in response to the sensing mechanism sensing that the first frequency of the computer is outside said preselected range. A bistable mechanism is coupled to the latching mechanism and generates a second frequency only if the latch mechanism is in its first state and if the test pulses and timing pulses are present at the bistable mechanism. The failure of the monitor to generate the second frequeney indicates a failure of the computer or the monitor.

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