Browse Prior Art Database

Core Characteristics Indicator

IP.com Disclosure Number: IPCOM000098821D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Center, JL: AUTHOR [+2]

Abstract

This device generates an oscilloscope trace of the inverse switching time (1/T) of a magnetic core plotted against the magnetic intensity (H) of the driving fields.

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Core Characteristics Indicator

This device generates an oscilloscope trace of the inverse switching time (1/T) of a magnetic core plotted against the magnetic intensity (H) of the driving fields.

The magnetic core under test is switched from remanent state 0 to remanent state 1 and reset to state 0 a plurality of times for each value of driving current, the latter being controlled by a staircase generator which steps after a predetermined number of switching cycles. The voltage generated at the output winding of the core is integrated and amplified, resulting in an output voltage which is a function of the magnetic flux (phi). This voltage is sampled once during each drive cycle, the sampling pulse for each cycle being delayed for an increasingly longer time from initiation of that switching cycle until a new series of switching cycles starts upon an increase of drive current.

When the voltage f(phi) is equal to the minimum value at sample time, a switching time counter is turned on and all sample pulses are counted until the voltage f(phi) reaches the maximum value at sample time, at which time the counter contains a digital count representative of the switching time. At this time the counter is turned off and its digital output is converted to an analog voltage. The reciprocal of this is a function of the inverse switching time of the core and is applied to the vertical input of an oscilloscope. The horizontal input voltage to the oscilloscope is obtained from...