PaulC Posted November 20, 2009 Share Posted November 20, 2009 I'm sampling 16 channels at 50 Hz on a LabJack U6. There are a few times that data is simply not recorded for 200ms. Only the second colum is important, which shows time since acquisition start. What are possible causes for the jump from 2.54 to 2.73 (row 3 to row 4)? This happens only once or twice per 10 second test. global time DataTime 40137.56347 2.5065 42.3 38.25 ... 40137.56347 2.5265 42.3 38.25 ... 40137.56347 2.5466 42.3 38.24 ... 40137.56347 2.7346 42.3 38.25 ... 40137.56347 2.7495 42.3 38.25 ... A few other times there are smaller dropouts, such as the 40ms drop from row 2 to row 3. 40137.56346 1.6866 42.3 38.24 40137.56346 1.7068 42.3 38.25 40137.56346 1.7426 42.3 38.24 40137.56346 1.7587 42.3 38.25 But 95% of the time many seconds go by with no loss in data. Is this a logging issue, a DAQfactory issue, or a Labjack issue? A plot of some data is included, with dropped data circled in red. Link to comment Share on other sites More sharing options...
AzeoTech Posted November 21, 2009 Share Posted November 21, 2009 To know what is really going on, I'd need to see the same examples, but with the first Time column displayed without Excel time enabled. So instead of 40137 you'd get a something like 1.25 billion. Then I can tell whether the problem is in the time stamp on the data, or in how you are calcing the dT values. Link to comment Share on other sites More sharing options...
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