Pressure versus Volume graph

[AlexThackray]

Hi Everyone,

On my system i require a graph of pressure vs volume.

I have tried merging the data from the my pressure transducer and my crank angle encoder (volume) but i end up with a graph showing the two different data streams.

How can i alter the information so that it gives me a graph of pressure vs volume instead of pressure and volume vs time?

I have struggled on this for a while now and i cant find a solution.

Please help me!

Alex

:mansad:

[Vikas_K]

You can use the XY graph instead of the normal Waveform graph.

Vikas

[AlexThackray]

Thanks Vikas,

I have linked up the XY graph express programme to 2 sine signals but cannot get the graph to show any points. The axis moves up and down which corresponds to the sine graph, but no line is shown? I have tried playing with the options but it still shows nothing.

Do I need to change the data type? Why is this so hard?

 Thanks

Alex

[MikeS81]

Hi Alex,

can you show us the vi with the xy graph?

Thanks

Mike

[AlexThackray]

Hi Mike,

Here you are.

Thanks

Alex

[Vikas_K]

Hi Alex,

I assume you are using the sinusoidal signals for experimentation. See the attached VIs - they should give you some idea of the usage.

Vikas

[AlexThackray]

Thanks Viskas,

Can you put these into an earlier version of Labview? Ive only got 8.2!

Thanks

Alex

[MikeS81]

Hi Alex,

here is your vi with some changes.

Mike

Message Edited by MikeS81 on 02-29-2008 01:08 PM

[Vikas_K]

Hi Alex,

Here are 8.2 versions..

Vikas

[AlexThackray]

Mike thats brilliant. Thanks.

I tried to get the data into the correct array/cluster forms for the XY graph but I just couldnt find the right ones.

Thanks a lot.

Alex