Hi
You have to use an other function - the vi Spline Interpolant is not what you need. You need a vi, that interpolates values. For instance you have these points (1/2), (3/4), (5/4), (7/6), (9/7) and you need the y-value for x=4. You have to search a vi that can calculate that (unfortunately I can't tell you where such a vi is in LV6.0). The vi you used does not do this.
If you can't find such a vi, then you either have to ensure that the x-values correspond due to the measurement or you have to create your own interpolation vi. As always there is a theory behind which has to be coded. In LV8.0 it's done by NI but in LV6.0 - maybe you have to code your own solution.
Thomas
Using LV8.0
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