Enhanced Edot X System

Smith, Scott ; Harry Bostick

关键词: ANALOG-TO-DIGITAL CONVERTERS;    COMPUTERS;    DATA ACQUISITION;    DESIGN EdotX;    EDOTX;    data acquisition equipment;    two channel analog to digital conversion car;    field programmable gate array;   

DOI  :  10.2172/957048
RP-ID  :  DOE/NA/27513-F
PID  :  OSTI ID: 957048
Others  :  TRN: US201018%%333

学科分类：社会科学、人文和艺术（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

The capability of EdotX would be improved by increasing the instrument's dynamic range to expand the range of signals measurable by the device. The heart of the EdotX system is a two channel analog to digital (A/D) conversion card with two analog to digital converters tightly coupled to a field programmable gate array (FPGA). Signals are continually digitized by the A/D and processed by the FPGA. When the FPGA detects a trigger condition, the data are transferred using direct memory access to the host computer memory, which in turn saves the data to disk. The original design utilizes a single A/D channel for data acquisition. The task was to increase the dynamic range of the system by enabling the second A/D channel, allowing the simultaneous acquisition of the original A/D channel and the additional second A/D channel. The input signal would be fed to the original channel and to the second channel with the second channel input being attenuated. When a signal hits the maximum range of the first channel, the data from the second channel, which is attenuated, are then used. Because both A/D's acquire data simultaneously, they may be used as a single expanded dynamic range channel.