xy graph

[Tek]

I am new to LabVIEW, so this may be an easy task; however, I have read several of the replies related to this topic as well as examined the xy graph.vi and xy chart.vi and have not solved my problem.  I am trying to create an xy graph that will plot data each time the VI is run and keep the old data on the graph as well.  I am trying to create a deflection vs. power plot of a MEMS device.  A specific voltage is applied to the MEMS device and a deflection is recorded and power is calculated when I run my VI.  I would like that point to be plotted, and then the next one added to the graph when I run my VI with a new applied voltage and so on until I quit the VI.  Could somebody give me a clue, and maybe send an example that will help me?

-Tek

[EVS]

Hi Tek!

Here is the example  (LabVIEW 7.1)

[altenbach]

Some people prefer shift registers over local variables. 😉 See the attached quick sketch (LabVIEW 7.1).

[Joe_H]

Just to explain some things to you . the waveform chart has a history length and what this does is it appends new data to the old until you reach the end of the history length then it will overwrite the old data, you can change the history length by right clicking on the chart and selecting chart history length. By using shift registers who now have the ability to (Waveform graph) append the new dat to the old for any amount of points that you want.

Hope this helped clear things up