Browse Prior Art Database

Test Apparatus

IP.com Disclosure Number: IPCOM000098772D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Golden, RK: AUTHOR [+2]

Abstract

A single, non repetitive waveform 1 derived from a circuit or component under test is displayed on a cathode ray tube 2 for a sufficient period of time to permit it to be time sampled and digitized. A comparison of the digitized samples with maximum and minimum digital representations previously stored on a medium, such as the magnetic drum 3, is made to determine whether the circuit or component falls within an acceptable operating range.

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Test Apparatus

A single, non repetitive waveform 1 derived from a circuit or component under test is displayed on a cathode ray tube 2 for a sufficient period of time to permit it to be time sampled and digitized. A comparison of the digitized samples with maximum and minimum digital representations previously stored on a medium, such as the magnetic drum 3, is made to determine whether the circuit or component falls within an acceptable operating range.

The waveform 1 is suitably defined when it is sampled at N intervals according to N = 2*T*W, where T equals the pulse width in time and W is the highest frequency component in the waveform.

Display of the waveform 1 on the CRT 2 is conventional, with the horizontal or X axis representing time and the vertical or Y axis representing amplitude. A reading camera or flying spot scanner 4 is programmed to read the waveform, with its beam being deflected to sweep vertically across the CRT face in successive horizontal steps. A sample is taken on each vertical sweep.

Vertical deflection of the scanner beam along the Y axis occurs in 32 steps for each horizontal step, and, in the example shown, total scanning similarly involves 32 horizontal steps. Scanning along the X axis is under control of an X counter 5 and a digital to analog converter 6 while scanning along the Y axis is under control of a Y counter 7 and a digital to analog converter 8.

Scanning is initiated by the application of a START pulse at terminal 9, whic...