A/D Converter Test for the 138E/139E and 189 Converters

This document describes the Maindec 845 diagnostic test package, designed for maintenance personnel to troubleshoot PDP-8 analog-to-digital (A/D) converters, specifically the 138E, 139E, and 189 models. The program performs confidence checks on data flags, interrupts, monotonicity, steady-state accuracy, and multiplexer operations. It includes instructions for loading, starting, setting switches, interpreting error printouts, and describes the two primary diagnostic routines: monotonicity testing and steady-state accuracy testing.