组合触发数采系统

QUEENTEST FOR TESING www.queentest.com 组合触发数据采集系统： 项目要求：两路光电二极管输出信号，高斯脉冲形式，半脉宽为 30纳秒左右，底部宽度为 50纳秒左右，两路由单片机输出控制方波信号，脉宽长度分别为 3—4μS（简称脉冲 I）和 100nS（简称脉冲 II），上升沿时间可以由单片机控制。当数采系统 检测 工程第三方检测合同工程防雷检测合同植筋拉拔检测方案传感器技术课后答案检测机构通用要求培训 到脉冲 I的上升沿时 候，标记时间 I, 检测到脉冲 II的上升沿的时候，标记时间 II，当两个上升沿都被前后检测到 的时候，开始对两路高斯信号进行采集，时间持续 6μS，其余数据记录不记录。当检测到 脉冲 I下降沿和脉冲 II下降沿的时候，又再次记录两路高斯脉冲信号，也是记录 6μS，如此 往复，脉冲 I的重复频率是 70—80Hz，脉冲 II的重复频率为 350Hz，采集数据和时间打包通 过 PCI-E 总线传输，经过计算得知，高斯信号需要采样为 200MS/S，精度 12bit，存储深度 256 M sample。 采集系统示意图： 高斯信号 高斯信号 控制信号 QUEENTEST FOR TESING www.queentest.com 控制信号 Spectrum 的 M3I.3242 独特的模拟信号输入，数字信号触发输入一体化设计，将帧信 号和行信号输入到 XIO0，XIO1，选择数据输入模式，就可以将这两位数字信号加入 adc 采 集数据中，实现了双数字信号组合触发的功能，因为板卡为 16bit的数据采集精度，除去 12bit 的数采数据外，还留有 4个空位可将时间标记信号记录，自带软件会自动将数据打包，通过 PCI-E总线或者在 DDR中存储， 同时将行信号作为外 trig信号输入，采用多次触发模式采集 数据，这样便轻松实现了多次重复组合触发，并将数据打包传输的功能。 QUEENTEST FOR TESING www.queentest.com 以前实现这种功能往往需要两块板卡，一款数字板卡，一款模拟量板卡，同时需要 FPGA开 发人员在 FPGA中进行算法逻辑的判别，除了需要增加系统费用外，而且还需要 FPGA逻辑 工程师进行算法逻辑的设计，可谓伤时耗资，而 SPECTRUM采集系统独特的设计便轻松解决 了这个问题，节省了大量的硬件和逻辑工程师的工作。 SPECTRUM 的板卡丰富的触发功能，在自动化测试，CCD成像系统，雷达，声纳，振 动分析等领域等都有出色应用。 SPECTRUM 软件触发功能介绍： 触发区域记录： The ring buffer mode is the standard mode of all oscilloscope boards. Data is written in a ring memory of the board until a trigger event is detected. After the event the posttrigger values are recorded. Becauseof this continuously recording into a ring buffer there are also samples prior to the trigger event visible: Pretrigger = Memsize -Posttrigger. 片选记录： The Multiple Recording option allows the recording of several trigger events with an extremely short re-armingtime. The hardware doesn’t need to be restarted in between. The on-board memory is divided in several segments of the same size. Each of them is filled with data if a trigger event occurs.Pre- and posttrigger of the segments can be programmed. The number of acquired segments is only limited by the used memory and is unlimited when using FIFO mode. 滤波记录： The Gated Sampling option allows data recording controlled by an external gate signal. Data is only recorded if the gate signal has a programmed level. In addition a pre-area before start of the QUEENTEST FOR TESING www.queentest.com gate signal as well as a post area after end of the gate signal can be acquired. The number of gate segments is only limited by the used memory and is unlimited when using FIFO mode. 时间戳记录： The timestamp option writes the time positions of the trigger events in an extra memory. The timestamps are relative to the start of recording, a defined zero time, externally synchronised to a radio clock, or a GPS receiver. With this option acquisitions of systems on different locations can be set in a precise time relation. ABA模式记录： The optional ABA mode combines slow continuous data recording with fast acquisition on trigger events. The ABA mode works like a slow data logger combined with a fast digitizer. The exact position of the trigger events is stored as timestamps in an extra memory.