display real time in x axis from zero in waveform chart

[vk92]

Hi, I am trying to develop a program in labview in which I need to get real time data on the graph. I am using wave form chart but I am facing problem with x-axis. In x axis I need time at which the data point is aquired in seconds but when i run the program I not getting the required time.Please help me in resolving this.

[GerdW]

Hi harika,

I need to get real time data on the graph. I am using wave form chart

Why do you use a chart when you want to use a graph?

Charts and graphs are two different things in LabVIEW!

In x axis I need time at which the data point is aquired in seconds but when i run the program I not getting the required time.

- Change the formatting of the x axis to show time instead of plain numbers.

- Use waveforms for plotting and enable the usage of the timestamp inside of the waveforms…

LabVIEW comes with a lot of example VIs. There are also examples explaining how to use charts and graphs. Did you examine them?

[vk92]

Hi,

I need to display all the data points while the program is running  due to this i am using waveform chart. I tried to change the x axis format to relative time then also I could not get the desired result. I looked through several posts but i could not find the proper solution.

I have attached the sample program

[GerdW]

Hi Harika,

as I wrote before: use a waveform!

I need to display all the data points while the program is running  due to this i am using waveform chart.

While a chart eases to display more samples you still could use graphs too…

[vk92]

Hii, 

I am getting the data in hr:min formate. Is there any way that my x axis starts at zero  sec when i run the program and x axis should display time in seconds only.

Thank you

[GerdW]

Hi harika,

I am getting the data in hr:min formate.

You can always change the formatting in the properties. It's just a right-mouse click away…

Is there any way

Yes, sure! 😄

that my x axis starts at zero  sec when i run the program

So you want to plot over time difference between time at start and current time? Then you need to calculate this difference…

and x axis should display time in seconds only.

Again: set the axis formatting as needed!

General notes:

- Charts are mainly used for evenly spaced samples (you can use the waveform datatype as shown above to get around this limitation).

- You can set the scaling/offset for the X axis to adapt for the delay between samples…

- When your sampling doesn't use a fixed dt you should use a XY graph instead…

Please provide as much details as possible!