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This paper treats the problem of large module pipelines, spares support, and storage in field locations where available workspace is at a premium. The emergence of microprocessor-controlled portable module testers is considered as a viable instrument to alleviate this problem. A digital module tester (DMT) described in this paper is the first step towards this new portable test technology. It incorporates interactive operator-to-tester features, self-test routines and the latest EPROM storage as elements for a rugged, reliable and easily maintained tester for on-site environments. Based upon this DMT, a projection into the feasibility of such a DMT emerging into full hybrid and analog module testers is made.