构建基于LXI的高精度同步和触发数据采集系统(英文)

Building LXI-based data acquisition systems with high-precision synchronization and triggering

LXI标准是基于成熟以太网的标准,作为新一代的自动测试系统平台已经非常快速地取得了成功。随着高速以太网以及基于硬件的纳秒级的高精度同步的广泛应用,LXI提供了构建可扩展的分布式数据采集系统的基础。本文提出了基于Bustec ProDAQ系列数据采集和功能卡的解决方案并讨论了采用IEEE1588的同步精度,该方案的精度已经达到直接使用电缆或总线的分布时钟的精度。同时提出了Bustec公司的独特的方案,该方案使用基于模拟级外部硬件触发信号或者派生触发信号来触发一个完整的数据采集系统,使之脱离了触发线缆的连接。

The LXI （LAN eXtensions for Instrumentation） Standard has quickly found success as a new generation automated test system platform based on the mature Ethernet standard. With the widespread use of high-speed Ethernet and the implementation of hardware-based, high-precision synchronization in the nanosecond range, it also provides a base for building scalable, distributed, data acquisition systems. This paper presents a solution based on Bustec’s ProDAQ series of data acquisition carriers and function cards and discusses thesynchronization via IEEE1588, which has reached a precision equivalent to solutions using direct clock distribution via cable or bus lines. It also presents Bustec’s unique solution to use external hardware trigger signals or derived trigger signals based on analog levels etc. to trigger a complete data acquisition system without the need for trigger cable connections.