Which is the correct Point on the waveform of the Signal?

Hello

Please see attached image.

I have labview software which is to measure the load of a load cell output. According to me, that the reading is accurate, except with the software Labview, we get up to 50 lbs less when we read it with the oscilloscope technician.

What I see is that the technician measure the amplitude of the signal at the top and when there is little noise reading of the oscilloscope is even higher because the placement of the cursor is higher.

I see that LabView is more or less because when we place the cursor oscilloscope in the middle of the measurement at the center of the signal signal not top it it reads then the same my labview program. I also have a low bypass filter in labview software.

Which are the correct measure points waiting for oscilloscope to measure? in the picture as an attachment the white slider is positioned correctly, or is the correct red cursor?

It's just an example of image zoom to see better.

Thanks to you all.

JCollado

If I understand you correctly the width of the track to noculars represents 50 lbs of difference as? If you think about how works a noculars, then the center of the line displayed is probably the most accurate. The line width is determined by a few things, noise superimposed on the signal being a. So, with a noise filtering in your LabVIEW its 'width of the line"program will be closer / diluent, as it will have removed some of the noise component. Place the cursor in the middle of the path displayed in the noculars is an approximation of this, sort of looking for the point where the noise is "average" out 1/2 top / in-1/2 under the cursor, which is about the signal of 'data '. It is difficult to make measurements of accuracy of a noisy signal with a noculars for this reason, where do you put the trace? If you were to remove the filter program LP you would probably get the equivalent of the "wide trace flag" which would be a series of values that plotted close the underlying signal, but with high and low variations equivalent to the width of the track.

So after all this verbiage, I would read the trace Center, perform an average of noise 'eyeball '.

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