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Browse Prior Art Database

Continuity Test for Ladder Networks

IP.com Disclosure Number: IPCOM000095837D
Original Publication Date: 1964-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Siegl, W: AUTHOR [+3]

Abstract

Information is stored in a transformer read-only store by the presence or absence of primary windings on transformer cores. The primary windings are deposited as a continuous ladder network on a thin insulating tape. This is subsequently programmed by punching out unwanted portions of the network. The limbs of the cores are then passed through apertures in the tape so that each core is surrounded by a loop of the network. A pulse on a primary winding produces a signal on the secondary winding of a core, if the primary winding passes through that core. The pulse does not produce a signal, if the primary winding by-passes that core. The ladder network must be tested for continuity prior to programming to eliminate the possibility of the occurrence of false information due to an open circuit.

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Continuity Test for Ladder Networks

Information is stored in a transformer read-only store by the presence or absence of primary windings on transformer cores. The primary windings are deposited as a continuous ladder network on a thin insulating tape. This is subsequently programmed by punching out unwanted portions of the network. The limbs of the cores are then passed through apertures in the tape so that each core is surrounded by a loop of the network. A pulse on a primary winding produces a signal on the secondary winding of a core, if the primary winding passes through that core. The pulse does not produce a signal, if the primary winding by-passes that core. The ladder network must be tested for continuity prior to programming to eliminate the possibility of the occurrence of false information due to an open circuit.

Continuity is tested by measuring the parallel resistance of a transformer core before and after it is inserted in an aperture. If the loop of the network surrounding the limb of the core is unbroken, then it acts as a shorted turn and the parallel resistance is considerably reduced. The drawing shows a portion of a ladder network with two transformer cores a and b threading two loops of the network. Each core consists of a U-shaped ferrite the open end of which is closed by an I-shaped portion carrying a winding. The measurement of the parallel resistance of the core a detects a break at 1 or 3 of loop 1, 2, 3 and 4 but does not detect a bre...