Optical Measurement Sampling of Relay Contact Erosion

Article

Lowrey, Ernest R.   (1959, ASQC)   Illinois Bell Telephone Company

Industrial Quality Control    Vol. 16    No. 2
QICID: 4401    August 1959    pp. 5-10
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Article Abstract

This article describes an optical means used to solve the contact erosion problem encountered in the maintenance of 50,000 to 400,000 relays employed in a modern dial telephone central office. Each relay has an average of five sets of contacts. Some relays perform up to 25 million operations a year.

Keywords

Measurement and control


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