PXI-6608 计数器/定时器模块 编码器位置测量

【产品详情】

5 V，8通道，精确参考PXI计数器/定时器模块—PXI‑6608是一款高精度计数器/定时器模块，可执行各种计数器/定时器任务，包括编码器位置测量、事件计数、周期测量、脉冲宽度测量、脉冲生成、脉冲序列生成以及频率测量。 该模块具有10 MHz恒温晶体振荡器(OCXO)、8个计数器/定时器、数字去抖动滤波器和TTL/CMOS兼容数字I/O。 PXI‑6608为汽车/航空航天、工业/运动控制和制造测试等各种应用提供了工业级坚固性。

NI生产的PXI-6608（部件号：777937-01）计数器/定时器模块是PXI-6602的增强版，增加了一个高稳定性时钟，称为烤箱控制晶体振荡器（OCXO）。该模块具有 8 个上/下计数器/定时器，分辨率为 32 位，所需功率为 1 A 至 2.5 A，施密特触发迟滞，测量和源频率均为 80 MHz，输入阻抗为 25 kΩ 至 500 kΩ，输出阻抗为 75 Ω。为了达到这些规格，建议预热时间为 5 分钟，温度范围为 0 °C 至 55 °C。

NI PXI-6608 模 块 的 一个 重要 特性 是 防止 重复 计数 或 同步 计数 模式。此功能可保证计数器在作为不紧不慢或非周期性外部源的应用程序中生成准确的信息。重复计数预防仅适用于缓冲计数器应用，例如测量频率或周期。在缓冲计数器应用期间，计数器应保存外部源在栅极信号上升沿之间脉冲的次数。

PXI-6608 计数器/定时器模块上的 OCXO 可确定用户时间测量和脉冲生成的精确度。OCXO 可以作为计数器的 GATE 或 SOURCE 运行。第三种选择是利用OCXO作为PXI背板时钟。任何锁相到PXI背板时钟的模块都将获得与计数器/定时器模块相当的时钟稳定性。公共参考时钟信号可用于协调测量或控制系统中的多个模块。

PXI-6608使用NIDAQmx驱动软件运行，该软件与LabVIEW、LabWindows/CVI或Measurement Studio等软件包/应用开发环境（ADE）兼容。

NI 设备 的 物理 尺寸 为 16.0 x 10.0 cm。它推荐的工作和存储温度范围分别为 0 °C 至 55 °C 和 –20 °C 至 70 °C，非冷凝工作和存储湿度范围分别为 0% 至 90% 和 5% 至 95%。

PXI-6608 计数器/定时器模块 编码器位置测量

【英文介绍】

5 V, 8 channels, accurate reference PXI Counter/Timer module - PXI‑6608 is a high precision counter/timer module that performs a variety of counter/timer tasks, including encoder position measurement, event counting, period measurement, pulse width measurement, pulse generation, pulse train generation, and frequency measurement. The module features a 10 MHz thermostatic crystal oscillator (OCXO), 8 counters/timers, a digital dejitter filter, and TTL/ CMOS-compatible digital I/O. The PXI‑6608 provides industrial-grade robustness for a variety of applications such as automotive/aerospace, industrial/motion control and manufacturing testing.

The PXI-6608 (Part number: 777997-01) counter/timer module produced by NI is an enhanced version of the PXI-6602 with the addition of a high-stability clock called an Oven Controlled Crystal Oscillator (OCXO). The module has 8 up/down counters/timers with 32-bit resolution, required power from 1 A to 2.5 A, Schmidt trigger hysteresis, both measurement and source frequencies of 80 MHz, input impedance of 25 kΩ to 500 kΩ, and output impedance of 75 Ω. In order to achieve these specifications, it is recommended that the preheating time be 5 minutes and the temperature range be 0 °C to 55 °C.

An important feature of the NI PXI-6608 module is to prevent double counting or synchronous counting modes. This feature guarantees that the counter generates accurate information in an application that is a slow or aperiodic external source. Repeat count prevention is only suitable for buffer counter applications, such as measuring frequency or period. During buffered counter application, the counter should save the number of times an external source pulses between the rising edge of the gate signal.

The OCXO on the PXI-6608 counter/timer module determines the accuracy of the user's time measurement and pulse generation. The OCXO can be run as a GATE or SOURCE for a counter. The third option is to use the OCXO as the PXI backplane clock. Any module that phase-locks to the PXI backplane clock will gain clock stability comparable to the counter/timer module. A common reference clock signal can be used to coordinate multiple modules in a measurement or control system.

The PXI-6608 runs with NIDAQmx driver software, which is compatible with packages/application development environments (ades) such as LabVIEW, LabWindows/CVI or Measurement Studio.

The physical size of the NI device is 16.0 x 10.0 cm. Its recommended operating and storage temperature ranges are 0 °C to 55 °C and -20 °C to 70 °C, respectively, and non-condensing operating and storage humidity ranges are 0% to 90% and 5% to 95%, respectively.

PXI-6608 计数器/定时器模块 编码器位置测量

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