Waveform chart auto clear

[Trainee123]

Hello,

I am doing data acquisition with labview and showing it on a waveform chart.  I wish to generate an excel file with two columns : time and amplitude automatically after the vi finishs. But everytime I start a new acquisition, the x-axis (time-axis) start from the previous time value and when the excel file is generated, the time doesn't start from 0. I know it is possible to perform"clear chart" from the data operation by right clicking the chart on the front panel, but it is troublesome to do so everytime. Is there any other way to clear the time-axis to 0 for every new launch of the vi?

[vsenthil957@gmail.com]

You can use reinitialize to default once the program ends and make empty chart as default by selecting edit>Make current values default

[Dennis_Knutson]

Or simply wire an empty array to the chart history.

[Trainee123]

Is it possible to reinitialize to the waveform chart to default values by itself without me having to click on " reinitialize to default values" manuelly before launching the vi?

[Dennis_Knutson · Accepted solution]

You've just been told two different ways to do that. Learn what property nodes and local variables are.

[Trainee123]

Thanks for the solution. I did this : 

but the excel generated doesn't save all the data from the waveform chart. It only save a short amount of data. Why is this so? Is there anyway to save all of the data?

[Dennis_Knutson]

Please take some of those free tutorials that you have been recommended on your other threads. The chart has a history. The default history is 1024 points and when it reaches that number of points, old data is dropped. You can increase the history but of you intend to run for extended periods, you need to save more often.