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High speed data acquisition appears to be averaging chucks of data

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I have 9237 modules running in a 9174 chassis, and the collection rate in Labview has been reduced due to the fact that I also have a 6218 USB DAQ running in the program, and the data needs to be collected at the same rate in order to compare the data. The internal clocks on the 2 systems are not synced; the program is using a time stamp. The problem I am having is that the data being collected from the 9237's seems to be average over chunks of time, giving to data a staircase look when it definitely should not be. Any suggestions as to how I might be able to remedy this?


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