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Crimp Joint Resistance Restoration Technique

IP.com Disclosure Number: IPCOM000043459D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Murcko, RM: AUTHOR [+2]

Abstract

A capacitive discharge unit is utilized to restore good resistance values to crimp joint connections at the ends of transitional head jumper wires for circuit card testers. The capacitive discharge unit consists of a bank of capacitors 1 that are discharged through the jumper wire 2 in the transitional head 3 via a power silicon-controlled rectifier. The discharge unit has a constant current source, voltage comparator unit 4 and voltage-to-frequency converter 5 to indicate the status of the unit and jumper being restored. The constant current source and voltage comparator 4 operate lights in the probe unit 6 to indicate whether the jumper resistance is below an acceptable value. This measurement is made prior to and after capacitive discharge to indicate restoration of good resistance to the jumper.

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Crimp Joint Resistance Restoration Technique

A capacitive discharge unit is utilized to restore good resistance values to crimp joint connections at the ends of transitional head jumper wires for circuit card testers. The capacitive discharge unit consists of a bank of capacitors 1 that are discharged through the jumper wire 2 in the transitional head 3 via a power silicon-controlled rectifier. The discharge unit has a constant current source, voltage comparator unit 4 and voltage-to-frequency converter 5 to indicate the status of the unit and jumper being restored. The constant current source and voltage comparator 4 operate lights in the probe unit 6 to indicate whether the jumper resistance is below an acceptable value. This measurement is made prior to and after capacitive discharge to indicate restoration of good resistance to the jumper. The voltage-to-frequency converter 5 monitors the status of the capacitor bank voltage and gives audio feedback 7 to the operator. In practice, a shorting block consisting of gold-plated copper foil laminated to a rubber sheet laminated to a thick aluminum plate is bolted to one side of the transitional head
3. This electrically commons one end of each jumper wire 2. The lighted probe 6 is now pressed against a contact on the other side of the transitional head, and the trigger button is activated. This causes the capacitor bank 1 to discharge through the jumper 2 and restore good resistance to the crimp. The light in the p...