Which Mode Is Best for Measuring Grounded Signal Sources? Hardware: Multifunction DAQ (MIO), Multifunction DAQ (MIO)
Problem: Which mode is best for measuring grounded signal sources? Solution: You may use either differential mode or non-referenced single ended mode to measure grounded signals. The best mode to measure signals is differential mode. It offers the advantage of common mode rejection, which eliminates noise that is present on both leads, thus improving the signal to noise ratio. Therefore, if you are measuring low-level voltages (below 2V) that may be some distance from the computer, it is advisable to use differential mode. The disadvantage of using differential mode is that it reduces the number of available channels by half compared to non-referenced single ended (NRSE) mode. If you have high-level voltage signals (i.e. above 2V or so) and need more inputs than what a differential setting can offer, you may use NRSE. Do not measure grounded signals using the referenced single ended (RSE) mode, since it is likely to introduce ground loops. Consult the user manual which came with your DAQ board for more details, and signal connection diagrams. Related Links: National Instruments Product Manuals 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 Attachments:
Report Date: 12/19/1995 Last Updated: 09/08/2005 Document ID: 0GI9S503 |
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