PROGRAMMABLE DIGITIZER ASSEMBLY 2A2A1

TM 11-6625-3081-23 1-13. DESCRIPTION OF TEST CONSOLE TEST BENCH 2A2 (cont) 1-13 c. PROGRAMMABLE DIGITIZER ASSEMBLY 2A2A1 (1) The programmable digitizer assembly 2A2A1 (Tektronix 7612D) consists of a mainframe, mounting provisions for two programmable plug-in amplifiers (Tektronix 7A16P - preamplifier), and a rear panel mounting for the interface assembly 2A2A1A1. (2) The digitizer is a microprocessor-based, dual-channel, waveform-digitizing instrument that analyzes waveforms in lieu of using an oscilloscope. It is located on the front of the test console test bench and is rack mounted using drawer slides. (3) The mainframe consists of the time bases, triggering circuits, controls, displays, and functions as the IEEE 488 bus interface for the programmable plug-in amplifiers. The front panel provides total control and is divided into three main control (function) groups that are panel color coded. These are: Function Panel Color Instrument control gray and yellow Time base blue Trigger green (4) A CCA (2A2A1A56) containing two address selector switches is located inside the unit. It is accessed by removing the programmable digitizer top cover assembly. (5) The rear panel contains 11 coax connectors, an IEEE 488 bus connector, a power switch, a fuse, and a fan. The fan forces air over the heat sensitive digital electronic circuitry. (6) Two identical programmable plug-in amplifiers (channel A and channel B) are installed in the digitizer. They provide display and trigger output signals to the digitizer. (7) The interface assembly 2A2A1A1 is mounted to the rear panel. It is powered by a direct current input and provides a fixed 200 megahertz clock signal output to the digitizer. This signal drives the channel A and B time bases. 1-57