problem with exporting data from Intensity Graph

[vispacespace123]

Hello community

I working on a VI to plot the characteristic of my transistor in the intensity graph or chart, I am changing gate voltage and drain voltage, and measuring current and voltage.

The purpose of using the intensity plots is to see the changing of the current  with the gate voltage and drain voltage while doing a lot of measurements, but when I want to export the data from the graph to the excel it gave me only the current measurements,no gate or drain voltage, can you help me to figure out the problem,maybe it is not possible or maybe i don't understand how it works.

 the VI is attached below.

[GerdW]

Hi vi  123,

when I want to export the data from the graph to the excel

You don't use a graph, you use a chart.

it gave me only the current measurements

Because it only contains the measurement data - as can be seen by THINK DATAFLOW!

You are also mixing lots of different data(types) due to heavy overuse of DDT wires and ExpressVIs. It would help to stay away from both…

[vispacespace123]

Hi GerdW

I removed the DDT wires and the Express XY graph, but can you tell why it would help to stay away from both.

I tried to think DataFlow ,so I wired the 2 voltages and current to the intensity chart, I exported the measurements and I got the 3  variables measurements, but in the chart I got the change of the 3 variables too instead of only the current, I thought that the change of voltages will be represented in X and Y axis. I don't know if I explain myself very well. I am here for any questions.

thank you

[GerdW]

Hi vi,

but in the chart I got the change of the 3 variables too instead of only the current, I thought that the change of voltages will be represented in X and Y axis.

Why do you think so?

The IntensityChart works (completely) different then the XYGraph…

When you want to learn/explore a new LabVIEW feature you should make up a small, simple test VI to just tst that new feature:

(LabVIEW also comes with a huge library of example VIs!)

[vispacespace123]

yeah I thought that it is possible even if I know how it works.

so it doesn't really plot 3 variables that I can choose against each other as it  is said here,it plots a 2D variable.

[GerdW]

Hi vi,

That text is correct: intensity graphs/charts do plot 3D data. But you are responsible for creating the correct order of data...

[vispacespace123]

I tried many times with the intensity chart, it gave me current on z axis,and nomber of itérations in x and y axis.

can you suggest a manner to plot current Id,Vd and Vg against each other.

I want Vd in X axis ,Vg in Y axis and current in Z axis.