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Electronic Oscilloscope Eye Curve Tracer

IP.com Disclosure Number: IPCOM000084590D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Blanarovich, YZ: AUTHOR

Abstract

Oscilloscopes are often used to display response characteristics of equipment under test. Often the same test is repeated many times. In these situations the same response characteristic is expected on the screen of the oscilloscope. A set of photodetectors located adjacent preselected display points on the screen can automatically detect that the expected response characteristic has been displayed, thereby eliminating the need for an operator to check the display screen after each test cycle.

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Electronic Oscilloscope Eye Curve Tracer

Oscilloscopes are often used to display response characteristics of equipment under test. Often the same test is repeated many times. In these situations the same response characteristic is expected on the screen of the oscilloscope. A set of photodetectors located adjacent preselected display points on the screen can automatically detect that the expected response characteristic has been displayed, thereby eliminating the need for an operator to check the display screen after each test cycle.

Photodetectors 1, 2, 3, 4 are mounted in slides 9 in a transparent sheet 5. Each photodetector is selectively positioned in the slide so as to be activated by a light trace at a predetermined point on the screen 8 of the oscilloscope 7.

When the expected response characteristic is displayed on screen 8 each of photodetectors 1, 2, 3 and 4 is activated. Each of the amplifiers A responds to the current flow through the resistor-diode circuit to set each associated latch L. If each latch L is set, the AND circuit 6 Regenerates an output signal indicating that the desired response characteristic has been displayed.

Upon detection of the desired response characteristic the latches L are reset and a new test cycle is initiated.

In those instances where one or more of the photodetectors are not activated by the display pattern an alarm signal is generated. The alarm signal draws the operators attention to the error condition so that any nec...