PDP-4 Module Tester 19640727

This document describes an automatic circuit tester designed to improve the efficiency and accuracy of production-line testing for digital logic modules, such as inverters and flip-flops. It highlights the limitations of manual testing, which is slow, costly, and lacks comprehensive data logging for increasingly complex circuits.

The proposed solution utilizes a PDP-5 digital computer as the central controller, connected to a test console and input/output devices. Key advantages of this automatic system include:

1. Significant Efficiency Gains: It dramatically reduces testing time from minutes or hours (manual) to mere seconds per module, leading to substantial cost savings (thousands of dollars daily) and a much higher throughput (e.g., 3,200 modules/day with one operator vs. 600 modules/day with 24 operators manually).
2. Enhanced Diagnostic Capability: The system provides detailed printouts of test results, including specific failure information, measured values, and limits, which greatly simplifies fault analysis and repair.
3. Unparalleled Flexibility and Data Logging: Computer control allows easy, software-based modification of test parameters, limits, and sequences for various module types, adapting to changing requirements. Unlike manual methods, it also offers automatic and comprehensive data logging through digitized readings.

The system functions by having the computer program power supplies (digital-to-analog conversion) to stimulate circuits and then measuring their responses via analog-to-digital converters, comparing these digitized readings against stored limits to determine module functionality and performance.