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Start Test Switch Circuit

IP.com Disclosure Number: IPCOM000050156D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Cruz, T: AUTHOR

Abstract

A circuit is disclosed for a start test switch which enables the consolidation of the functions of actuating an air valve to close contacts on an integrated circuit module to be tested, providing a delay after contact is made to the pins of the module so as to enable the circuit to settle, and then to commence the test. After the test has been completed, the circuit shown in the figure takes the end of test signal and terminates the air valve, thereby releasing the electrical contact of the tester to the pins on the module.

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Start Test Switch Circuit

A circuit is disclosed for a start test switch which enables the consolidation of the functions of actuating an air valve to close contacts on an integrated circuit module to be tested, providing a delay after contact is made to the pins of the module so as to enable the circuit to settle, and then to commence the test. After the test has been completed, the circuit shown in the figure takes the end of test signal and terminates the air valve, thereby releasing the electrical contact of the tester to the pins on the module.

The figure shows the start test switch circuit. The foot switch 1, when closed, turns on the single shot 2 which provides a well defined up level signal to the D input of the flip flop 3, turning on the Q output of the flip flop 3 and therefore illuminating the light emitting diode (LED) 6. The Q output of the flip flop 3 goes low and is input to the driver 7 so as to provide a current to the solenoid 8 to actuate the air supply valve. The air supply valve, in turn, mechanically actuates the electrical contacts for the test head to enable electrical contact to the pins of the module. At the same time, the Q output is input to the delay 9 and the signal is delayed for a period of approximately 500 milliseconds in order to enable any transients established in the circuit to be tested to settle out. The delay 9 then outputs an enabling signal on the line 10 to the tester 4, to thereby start the testing operation.

After t...