How come I do not get the same signal in LabView??

Basically, I want to reproduce a force curve on Nanoscope program into Labview, since labview has faster aquisition rate.
Anyways, since there are two voltage signals, I wanted to plot XY graph of them. However, I get a wierd signal that is not quite close to what I am supposed to get.
I am thinking about maybe there are some noise problem, or there is a little delay in getting the two signals (ex, the two signal is not in sync)
If anyone has similar experience or tried to the same experiment, please let me know. It would be really helpful.
Thanks.
Attachments:
ScreenShot048.gif ‏3 KB
ScreenShot016.gif ‏53 KB

Hi,
I just wanted to filter the y signal. Tried using smooth filtering, but didn't work well. Now, I am trying the Lowpass with 30Hz cutoff frequency; however, when I run my VI, it give me this error message
"Analysis: The following conditions must be met: 0 < f_low <= f_high <= fs/2."
If I can get better signal for y axis, I might get a better graph, as you said.
Thanks and if you know what that error is for and what to do to make it run, please let me know.
Mike.
Attachments:
ScreenShot002.gif ‏26 KB
ScreenShot004.gif ‏25 KB
ScreenShot005.gif ‏43 KB

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