waveform in SCOPE soft front panel and waveform in Labview

[seong.yoo]

Hi, I have a problem in the data acquisition.

I expected that the waveform in scope soft front panel and the waveform in Labview are the same.

I've got beautiful(?) sine wave in scope soft front panel (See "soft front panel.bmp"), but the waveform in Labview is not beautiful sine wave (See " DataOverTime.bmp).

The waveform in Labview is plotted by the data acquisition process.(See VI.bmp).

I believe that the data acquistion process read data from a digitizer and plot a waveform.

So I think both wavefroms should be the same.

I'm a newer for PXI-5105 and Labview.

Please help me if anyone know what problem is. I really don't understand why they are different.

[DFGray]

If the acquisition parameters are the same, the NI-SCOPE Soft Front Panel and a VI should give you the same graph.  In your case, this does not appear to be true.  The SFP has set the vertical range to a much lower number than your VI, and is taking far more data points (guess about 2000, while your acquisition is showing 26).  Since your VI is using user inputs for these values, I cannot confirm exact numbers.  Set your vertical range to about 20mV, your minimum number of samples to 2000, and your sample rate high enough to view the data you want to see and you should be good.

Let us know if you need more information.