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Automatic Hysteresis Tester

IP.com Disclosure Number: IPCOM000098433D
Original Publication Date: 1960-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Detweiler, VW: AUTHOR [+2]

Abstract

The presence of hysteresis in a crystal diode 1 is detected on a go no go basis. A sixty cycle half sine wave 3 is impressed across the diode 1 under test. If the diode has hysteresis, the resulting current wave 2 is not symmetrical.

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Automatic Hysteresis Tester

The presence of hysteresis in a crystal diode 1 is detected on a go no go basis. A sixty cycle half sine wave 3 is impressed across the diode 1 under test. If the diode has hysteresis, the resulting current wave 2 is not symmetrical.

This distorted current wave 2 is then amplified in a linear amplifier 4. A squaring amplifier 5 generates a variable width square wave 6. The current wave 3 and square wave 6 are mixed in the first diode gate 7. The pulse generator 8 drives a multivibrator 9 at the same repetition rate as the current wave. The current wave is split into left 10 and right 11 sections in the second 12 and third 13 diode gates.

The peak amplitudes of each are then changed into D. C. levels in the peak detectors 14 and 15. When the difference in D. C. levels exceeds a given value, the difference amplifier 16 operates a relay, which activates the reject mechanism 17. An infinite number of points may be checked along the curve by varying the width of the square wave from the squaring amplifier.

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