Displaying system time on chart each time I acquire data.

[kirthi]

I am using a chart for displaying the data I acquire from the instrumentation system. I need the system time to be displayed on the x-axis each and every time a data is displayed on the chart. I need the entire set of data to be plotted on the chart or atleast I need the scroll bar, which I can use to see the other data which are not visible in the chart. I have tried using property nodes and scroll bars. I have a while loop and computations inside the while loop. I am unable to display the system time on the x-axis during each time. We run experiments for a long time and seeing the data acquired over a long period of time with respect to the system time is important. Kindly, let me know if any of you know how to
solve this problem. Thankyou. Kirthi

[Ben]

I have done similar tasks, but I am a little confused on what is not working for you.

Could you please post your code (or a screen shot) showing us what you are trying to do and what is not working.

Trying to help,

Ben

[JRA]

I'm attaching an example VI which should be what you're looking for. It plots some generated data against the system time. I hope this helps out.

[kirthi]

Hi there,
Thank you for the suggestion. I tried running the vi you had sent. After running for a day, there is a lapse in the actual system time and the time displayed on the X-axis of the graph. I would like the system time to be acquired as and when the data is plotted on the graph. My problem is I can do this, but the time and data that was plotted should remain from the time I start running my application to the time when I terminate the application. I have resend my previous question along with the snap shot of my. Thank you very much. The vi was helpful.

[dcwork@hotmail.com]

Hi,
You should use XY graph in your program. Add XY ChartBuffer.vi in Variable-Time ChartXY.vi of Labview example and also consider JRA's example. Select suitable history length (too big will slow your PC)based on the measurement time and record interval.