Browse Prior Art Database

Relay Tester

IP.com Disclosure Number: IPCOM000096928D
Original Publication Date: 1962-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Batson, DL: AUTHOR

Abstract

This tester rapidly checks all contact points of a four-, six-, or twelveposition relay. When switch S1 is closed, a circuit is completed through a divider network including resistors R1 and R2. Switch S2 is temporarily closed to complete a branch circuit through ammeter A and potentiometer P before the relay to be tested is plugged in. After P is set to provide desired normal values of current for a chosen voltage, switch S2 is opened.

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Relay Tester

This tester rapidly checks all contact points of a four-, six-, or twelveposition relay. When switch S1 is closed, a circuit is completed through a divider network including resistors R1 and R2. Switch S2 is temporarily closed to complete a branch circuit through ammeter A and potentiometer P before the relay to be tested is plugged in. After P is set to provide desired normal values of current for a chosen voltage, switch S2 is opened.

The relay is plugged in to complete another branch circuit via all normally closed contact points 1...12 in series, arm of manually rotatable switch S3, ammeter A and potentiometer P. An A reading in a predetermined range denotes all normally closed points are conducting properly. Then, switch S4 is closed to energize coil PC of the relay. This completes a circuit through resistor R1, all normally open contact points 1'... 12' in series, arm of switch S3 and ammeter A. If the ammeter reading is within the predetermined range, then all normally open points are conducting properly and testing is completed.

The arm of S3 should be at the position corresponding to the number of contact points of the particular relay being tested, e.g., at the 12 position for the 12 position relay illustrated. If a contact point is contaminated or open, the resultant higher resistance causes the A reading to be below the predetermined range. In such case, the faulty contact point is isolated and identified by rotating selector switch S3 to...