Why is There Skew Between Output Lines on the NI 9403?Hardware: CompactRIO>>Digital Input Modules>>cRIO-9403
Problem: When I view the outputs on my NI 9403, I notice there is a skew. Is this expected behavior of the module? If so, why does this skew occur? Solution: This is expected behavior for the NI 9403 module. The maximum skew between two lines is specified in the operating instructions as the channel-to-channel skew and is the amount of time between the first output signal updating and the last output signal updating. The channel-to-channel skew is listed as 265ns maximum. This skew is necessary to mitigate crosstalk issues when multiple output lines are switched at the same time. There is no way to prevent skew on output lines of the module. The NI 9401 is recommended for applications that need tighter control over the skew as this module does not have a channel-to-channel skew. Related Links: Product Manual: NI 9403 Operating Instructions and Specifications Product Manual: NI 9401 Operating Instructions and Specifications KnowledgeBase 23QFSBQ1: What Does the Skew Specification Mean? Attachments:
Report Date: 06/17/2007 Last Updated: 05/08/2009 Document ID: 4AGED7LX |
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