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RELAY TESTER

IP.com Disclosure Number: IPCOM000024195D
Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 73K

Publishing Venue

Xerox Disclosure Journal

Abstract

The figure shows the circuit diagram for a, relay tester which electronically identifies defective relays. A terminal 11 for receiving a single supply voltage is connected to the non-inverted input (+) of an operational amplifier 12 through a precision resistive voltage divider which is made of resistors 13 and 14. The contacts of the relay to be tested, generally indicated within the envelope 15, are wired in series and the single supply voltage is applied to the relay. The last contact in the series is connected to the inverted input terminal (-1 of the operational amplifier 12 through another precision resistive voltage divider which is made of resistors 16 and 17. Selection of the normally open position or normally closed position for the relay is accomplished by a hand operated switch 18. Switch 18 is connected to the supply voltage, and in closed position it supplies power to a relay coil 19.

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CEROX DISCLOSURE JOURNAL

RELAY TESTER

Alan J. Diamond Jeffrey D. Werner

Proposed Classification

U.S. C1. 324/123 R Int. C1. GOlr 1/30

The figure shows the circuit diagram for a, relay tester which electronically identifies defective relays. A terminal 11 for receiving a single supply voltage is connected to the non-inverted input (+) of an operational amplifier 12 through a precision resistive voltage divider which is made of resistors 13 and 14. The contacts of the relay to be tested, generally indicated within the envelope 15, are wired in series and the single supply voltage is applied to the relay. The last contact in the series is connected to the inverted input terminal (-1 of the operational amplifier 12 through another precision resistive voltage divider which is made of resistors 16 and 17. Selection of the normally open position or normally closed position for the relay is accomplished by a hand operated switch 18. Switch 18 is connected to the supply voltage, and in closed position it supplies power to a relay coil 19.

A Zener diode 20 is connected to the output of the operational amplifier 12, and it is also connected to a transistor 21 through a base voltage drop resistor 22. A base bleed resistor 23 bleeds the Zener leakage current to ground, thus preventing premature triggering of transistor 21. A LED 24 is connected to transistor 21 through a collector resistor 25. The Zener diode 20 in combination with the base turns on voltage for the transistor...