vertical offset and triggering on 5102 digitiser

[Pazzer1]

How do I get two traces spaced apart on a graph when using a 5102 digitiser, I have tried adjusting each off set but the traces just disapear from the graph.

Is there something I need to set?

Any ideas

Also I am reading values from the graph using a couple of cursors, this works great for a constant signal from the digitiser, but when it is a single pulse the display disapears when the timeout expires.  

How can I get it to stay on the the display so I can move the cursors to display the values, also the cursors values don't change when there is no trace, they stay on the last value.

Thanks

Allan

[JonBowers]

Hi Allan,

What software are you using (LabVIEW, LabWindows/CVI, Measurement Studio, Soft front panel...)? On the Waveform Graph control you should be able to set it to stack plots, so you have two seperate plots on the same graph. You could also have separate Y-Axis for each plot allowing you scale them appropreately. If I know what software you are using I could probably write a small example.

Regards

Jon B
Applications Engineer
NIUK & Ireland

[Pazzer1]

Hi Jon,

I thought of that after reading some other posts, and it does what I need  thanks.

The only thing I need to sort out now is how to stop the trace disapearing from the screen after a single pulse is captured, when it times out the trace on the screen disapears so I cannot measure it.

Any ideas

Thanks

Allan

[Pazzer1]

It's Labview version 6.1

[JonBowers]

Hi Allan,

The trace probably disappears because when the digitiser times out it passes out an empty waveform which overwrites your current trace. To get round this you could put your graph inside a case structure and only update it when new data is available not when the digitiser times out.

Regards

Jon Bowers
Applications Engineer
NIUK & Ireland