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Automatic Optical Sensing of Scope Output

IP.com Disclosure Number: IPCOM000097702D
Original Publication Date: 1961-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Hairabedian, BZ: AUTHOR

Abstract

This system automatically monitors the output of a cathode ray tube and provides a GO, NO-GO test for parameters of electronic units. Standard oscilloscopes are compatible with this test system.

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Automatic Optical Sensing of Scope Output

This system automatically monitors the output of a cathode ray tube and provides a GO, NO-GO test for parameters of electronic units. Standard oscilloscopes are compatible with this test system.

Traces of component parameters, as displayed on the face of a CRT, are projected by optical devices to and through a pair of transparencies. A pair of transparencies is provided for each parameter tested. One of the transparencies masks out the wave shape of the test pattern, the other all but the trace.

Photomultiplier tubes mounted next to the transparencies sense the test pattern and signal the control circuitry. Of four possible signal combinations from the two photomultiplier tubes, only one combination indicates a good test, A plus signal from PMT-A and a minus signal from PMT-B (inverted) make the AND circuit output plus. Any other combination produces a plus signal from the OR circuit. Plus output from the AND circuit is an accept signal and automatically controls advance of testing to the next parameter or to another unit. The OR circuit output, when plus, indicates a reject operation and automatically controls eject of the faulty unit and advances another unit to be tested.

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