具有 USB 2.0 接口的产品可能无法获取依时连续数据(连续数据的一部分变薄),但取决于所用 PC 的性能和重复时间等因素。一开始,通过 USB 2.0 接口将数据传输到 PC 不会有任何问题,但数据传输会因 PC 的性能和操作状态逐渐出现延迟(例如,由于连接的其他 USB 设备或同时使用的软件中断操作)。如果数据传输量开始跟不上已完成 AD 转换的数据量,则会跳过下一次扫描的数据,导致数据变薄的状态。以较高的重复频率进行连续测量时,这种现象将会更明显。对于具有 USB 2.0 接口的产品,数据单中列出的线路速率是在不发生数据丢失的情况下,将数据从电路连续传输到 PC 时的理论值。
具有 CameraLink 接口的产品不会发生上述现象,因此可以获得连续数据。
请检查以下两点:
1. 选择正确的相机文件。例如,使用 C11512 系列和 PCIe-1427 时,对于 Measurement & Automation 软件(由 National Instruments 开发),应选择 c11512_1427_max.iid 文件,对于 DCam-CL 软件(由滨松开发),应选择 c11512_1427.iid 文件。使用除 C11512 系列以外的其他多通道探测器探头,或使用除 National Instruments 以外生产的其他帧抓取板时,请选择相应的相机支持文件。
2. “Measurement & Automation”和“DCam-CL”软件不能同时使用。启动 DCam-CL 时,应确保 Measurement & Automation 软件未运行。要在 Measurement & Automation 已经运行后启动 DCam-CL,请关闭多通道探测器探头的电源并重新打开,然后启动 DCam-CL。
我们建议使用由 National Instruments 生产的以下帧抓取板:
PCIe-1427、PCIe-1429、PCIe-1430、PCIe-1433
尽管其他制造商的帧抓取板也能操作多通道探测器探头,但它们不能与多通道探测器探头附带的 DLL 和应用软件结合使用。如果使用其他制造商制造的帧抓取板,请通过发送说明手册中列出的命令并使用随帧抓取板提供的 DLL 来操作多通道探测器探头。
专用电缆不随多通道探测器探头供货。而是随 C7557-01 多通道探测器探头控制器供货,用于连接到探测器探头。
使用噪声尽可能少的电源。建议使用稳压直流电源。尽量避免使用开关电源。
用户可以自行更换传感器。但用户在操作传感器和探测器探头时必须采取充分的防静电措施。有关如何更换传感器的说明,请参阅说明手册。请注意,如果用户在更换过程中损坏传感器或探测器探头,则即使仍在保修期内,保修也会失效。因此,更换传感器时要格外小心。
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