A to D Test

This document outlines the diagnostic procedures for the A to D test (MAINDEC-12-D6CB-D) on the PDP-12 computer system. It describes the methods used to test knob continuity, A-D monotonicity, and to calibrate preamps for gain and offset. The program includes provisions for testing sixteen additional A-D channels via the AM12-AG12 multiplexer extension. The document provides detailed loading, starting, and operating procedures, including specific switch settings for various channel displays on the VR12 oscilloscope. It also includes an error routine description and complete program assembly listings.