What is the right way to collect data XY?

How our works of Labview code is very poor. We want to do the following: initialize a DAC and then in a loop: 1. read from an ADC or a counter. Trace playback as a point on a XY Chart (DAC setting like x, ADC read as y) 2. Assign the CAD a new value 3. Wait a while for the equipment to balance 4. Read the ADC again, etc. I don't know a good way to keep the data and send it to the XY graph. Our former program initialized a table 2D, with a column being the ramp CAD and the other holding all zeros. Then, as the data have been collected, zeros have been updated with the data. This method is not good, because the graph has always shown a flat curve until all the data, instead of scaling properly the limits of actual data. Is there a tutorial or an example to help with this concept? I basically understand the help of error and flow control task, but I don't have a knowledge of the shift registers and initialization.

Rgann wrote:
Our former program initialized a table 2D, with a column being the ramp CAD and the other holding all zeros.

You must initialize the array 2D with the ramp for x and the line is that contains all the NaN. Any point that contains a NaN value will not appear on the graph.

Usually, I prefer to keep the range constant x instead of with each new point scale, but if you want to keep the x scale tight, you can update the min and max range using nodes of property according to the current insert point.

You already use a shift register (or feedback node) to contain your table, so this should be OK, as is.

Also remember that if the ramp is linearly spaced, you can use a waveform graph. You just need to set 0 x and dx accordingly. (A xy chart is necessary only if the points are not evenly spaced in x.)

Tags: NI Software

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