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测量一个有接地的信号，应该用哪种模式测量最好？
硬件: Multifunction DAQ (MIO)
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问题: 测量一个有接地的信号，应该用哪种模式测量最好？
解答: 您可以用differential或non-referenced single 两种模式去测量。最佳的方式是differential，它可以消除共模干扰。增加信噪比。因此，如果您要测量低电位的电压，（低于2V）最好用此模式。其缺点是它比使用non-referenced single （NRSE）模式减少了一半可使用的通道数。如果您量測的是一高电位的信号，而且需要多个通道数，您可使用(NRSE)模式。不要用RSE模式测量。它会产生接地回路。
相关链接:
National Instruments Product Manuals
KnowledgeBase 0GI98T03 : Which Mode Is Best for Measuring Floating Signal Sources?
KnowledgeBase 1PQDTM00: How can you set different channels on an E-Series board to acquire in different modes
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报告日期: 12/19/1995
最近更新: 09/27/2008
文档编号: 0GI9S503