Hi Nick
There are no internal limitation for 100 points in LabView 7.0 for x-y graph.
So the problem is more on your side.
Check that your X-scale range is set to automatic
Check that you are saving more than 100 points
check that you are not using a "chart" instead of a "X-Y graph".
If so, use an X-y graph or increase the buffer size
Cheers
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