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Oscilloscope Intensity Gating

IP.com Disclosure Number: IPCOM000074421D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Stuebner, FE: AUTHOR

Abstract

An oscilloscope may be modified by the addition of the illustrated circuitry so as to gate the intensity to the CRT of the oscilloscope only when a vertical signal is present. The circuit is useful, for example, when a camera is mounted on the oscilloscope to take a picture of the shape of the signal when the vertical signal occurs.

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Oscilloscope Intensity Gating

An oscilloscope may be modified by the addition of the illustrated circuitry so as to gate the intensity to the CRT of the oscilloscope only when a vertical signal is present. The circuit is useful, for example, when a camera is mounted on the oscilloscope to take a picture of the shape of the signal when the vertical signal occurs.

To accomplish this, at the end of each sweep, a sweep gate signal is applied to an inverter I that produces a reset signal for resetting trigger T1. The output of T1 is used to control the intensity gate of the scope. When T1 is set, the scope intensity will remain on until the end of a sweep. Vertical signals from the scope are applied through an amplifier A to the set side of trigger T1. During the course of a sweep, when the vertical signal arrives, it sets T1 causing the intensity to be turned on until the end of the sweep. The output of trigger T1 is also applied to the set input of a second trigger T2 whose output controls an indicator bulb 2. Trigger T2 is turned off by a reset switch 1, which in turn, turns off bulb 2. When a camera is mounted on the scope and a vertical signal is present, the setting of trigger T2 and hence, the illumination of bulb 2, provides an indication that the film has been exposed.

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