Comfortable Scope Component?

[j_eble]

Hello all,

I am looking for a comfortable Scope Component for use in LabView that goes beyond a strip chart. The following is what I need:

Possibility to use marker liners 2 for x- and 2 for y-direction. The differences will be shown and updated while moving a marker line.

Similarly, points should be available for Minimum /Maximum values etc.

The signal to be shown comes from the serial port at 115 bps, so the graph has to be fast enough.

Possibility to zoom in and out.

Possibility to stop the recording and to save the waveform.

Possiblity to cut the curve (with cutting lines) and to re-save the cut curve.

Possibility to edit the graph.

I would like to load the waveform and have the same possibilities again (zoom, cutting, moving markers etc.)

Is something like this available for LabView? It can also be an ActiveX Component. Or sombody knows of a c/c++/.net library, whatever.

I use LabView 7.1

Best Regards

Johannes

[Christian Mergl]

Hi Johannes,

Sure, everything of the points you wrote is possible within LabVIEW.

You just have to use the Waveform Graph with it's cursors (you can set several coursors for one graph), where you can read out the current cursor position of every cursor using a property node. Exactly you will get an array of clusters which are the several corsors and there attributes like the x and y position. Then you can read out the positions of every corsor, substact them to become the difference. There are also functions available in LabVIEW for min and max values e.g. of an array. Zooming is also possible with the waveform graph. The methode to cut/save/reload the curve will depend on the datatype you are working. If it is an array you can use the different array functions to e.g. cut the curve and save only the resulting values.

The attached screenshot shows a little example for getting the difference between two cursors position and also the content of one cursors cluster.

Hope this helps, Christian

[j_eble]

Hi Christian,

thanks very much for your detailed answer. I will check your approach with the Waveform Graph ASAP.

Best regards

Johannes