Multiple waveform charts "stacked plots" with limits

[rafale350]

Hi everyone

Here is my problem, currently i have 4 waveforms "attached" together with the "Build Array" function and connected to a waveform chart.

I use the option "stacked plots" in order to have 4 curves with only one x-axis.

What I want to do is to add for each curve an upper limit line.

Thank you very much in advance for your replies!

[ThiCop]

Hello Rafale,

Maybe a question out of the box:

Do you want the current maximum of the signal?

Or do you just want to show a line which you should not go above?

In the latter case: Is this Upper Limit fixed (during your measurements)?

[rafale350]

Hello ThiCop!

Yes, I want to show a line which we should not go above and yes this limit is fixed during our measurements.

(I receive the value of the measure and its upper limit by TCP / IP)

Thank you for your reply!

[GerdW]

Hi rafaele,

add 4 more plots to your chart to show the limit lines...

[ThiCop]

Hello Rafal,

As you probably noticed in my other post I like to have all background information.

I'll do the same here, but I'll also give you first a relatively simple solution.

If you have a Graph (and not a Chart), then you could just use Cursors to do this and everything would be fixed.

Seeing that you're not using a Graph, you can add an extra data set (with the constant Maximum) that you also write to your Chart. (see Gerd 😉 )

Or you could use a Graph and its Cursor Functionality and make it behave like a Chart.

There are several options, but to have a better idea at what might be best suited, it might be interesting to have a complete overview of how your application works.

Does your TCP/IP communication send the maximum/boundary and all the data at once?

Or do you really want to see each new data sample that appears on the TCP/IP "input"?

[rafale350]

Hi GerdW,

If I do this, the limit lines will be displayed on separate graphs and I will have 8 waveform charts ...

Thanks.

[rafale350]

Hi ThiCop,

The measurements are performed continuously and the goal is to display the current and former values of measures taken over a period of two weeks and that's why I use chart and not graph.

An other computer sends measurements to my VI every 2 minutes and possibly the new upper limit if needed, these informations are then placed in a queue.

I use chart in order to avoid the management of buffers. I prefer to have 4 separate waveform charts with their upper limits that having to manage buffers.

Thank you again for your reply.

[GerdW]

Hi rafaele,

nothing comes for free! The chart is provided as is...

Your next best option is tu use 4 charts instead of just one with stacked plots. Hide the x axis for 3 of them and display 2 plots each...

[rafale350]

Hi Gerdw,

Ok thanks! I will use 4 separate waveform charts, it's a bit unfortunate, it would have been "nicer".

I've already tried to hide the x-axis of 3 waveform charts and then superposed them, but it's not very "pretty".

[GerdW · Accepted solution]

Hi rafaele,

use the charts from classics palette. Make their border/background transparent and use a decoration as "border" for all 4 of them...