NI高速数字化仪有最小采样率吗?



硬件: Modular Instruments>>High-Speed Digitizers (Scopes), Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5922, Modular Instruments>>High-Speed Digitizers (Scopes)>>AT-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>DAQCard-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>USB-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>DAQPad-5112 for IEEE 1394, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5112, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5122, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5124, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5911, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5112, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5122, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5124, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5152, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5620, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5621, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5911, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5922

问题: NI高速数字化仪有最小采样率吗?

解答: 所有National Instruments的高速数字化仪可以使用一种抽取的方法来获取ADC的低于最大采样率的一种采样率。这是通过将最大采样率除以某个整数n实现的。对于每种数字化仪来说,n的最大值是不同的,这样最小采样率就是不同的。

最小采样率可以在产品规范表中找到,一般在“Sample Rate Range”中。在某些规范表中,它列在"Real-Time Sampling" 或者 "Minimum Sample Rate"中。 附件中的屏幕截图中可以看到NI 5124的采样率。所有高速数字化仪规范表链接如下。

如果最小采样率不适合您的应用,那么您可以考虑使用一个外部的采样时钟。这个外部采样时钟用来替代板载时钟(VCXO)进行同步或者获取无法使用板载时钟指定的采样率。某些设备也可以抽取外部采样时钟来获取采样时钟,该采样时钟是外部采样时钟整除的结果。例如,如果外部采样时钟是70MHz,您可以2倍抽取该时钟从而获取35MS/s的采样率。

要想获取更多关于采样时钟和抽取的信息,请参考NI High-Speed Digitizers Help。

相关链接: NI High-Speed Digitizers Help
High-Speed Digitizers Home Page
NI 5102 Specifications
NI 5112 Specifications
NI 5114 Specifications
NI 5122 Specifications
NI 5124 Specifications
NI 5620 Specifications
NI 5621 Specifications
NI 5911 Specifications
NI 5922 Specifications

附件:





报告日期: 09/20/2006
最近更新: 10/10/2006
文档编号: 3ON9JAOY