Testing of Individual Cores in MTC Memory Planes
Hughes, A. D.
The 32 x 32 magnetic-core memory planes for MTC were constructed from cores tested and sorted on a production basis. To obviate the possibility of defective cores, each core was retested after it had been wired into a memory plane. A device was constructed to enable the operator to send current pulses through each core in a plane and observe output. The necessary test equipment was arranged to provide the pulses and allow measurement of the outputs. No defective cores were found. The test showed that the limits of output voltages at the sensing time used were +17%. Five cores with outputs outside of these limits were replaced. Taking into account that the variable factors inherent in testing and equipment are ±5%, the cores in each plane are within approximately ±20% limits.