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[joetoulouse]

Hello,

I'm actually a novice with programming on LabView, so I don't know the right methodology for my problem.

I'm working on a traction machine instrumented with a LVDT and a load cell which are analysed with a NI-USB 6008.

My problem is to do the acquisition and display the signals on a graph at the same time (a small time lag isn't a problem) and to keep the old plots on this graph.

So I would like to get : 

- the evolution of the strenght depend on the LVDT

- acquisition and display at the same time

- save the old plots and values

Could you please exaplin me the way and the LabView tools to use ?

I thank you for your assistance which will be invaluable, I'm sure, very Je vous remercie d'avance pour votre aide qui me sera, j'en suis persuade, tres precieuse.

Joseph

[devchander]

You are using a NI USB 6008 daq card.

• first pick continous AI acq program for examples shipped with labVIEW.
• To convert the voltage (that this program will read from the scanned channel) to LVDT displacement, you can use  custom scale VI function found on your tools palette.
• next use a chart to dispaly data instead of graph. Because a chart has history memory and a finite number of past data samples can also be see on it.
• You can use File I/O VI's to save data that you are acquiring.

Any doubts, do get back.

regards

Dev