How to increase the performance of xy-graph

Hello

I'm running a continuous collection of data with a NI PCI 6133 (4 x channel HAVE @ 2, 5MS/s each) on a WIN 7 PC (LabView FDS 2012). Inside a while loop I'm able to acquire 2000 samples per loop for each channel with a stable performance loop of about 1, 25 kHz. Out of these data, I'm 24 calculation values that will be shown on 6 xy-graphs (4 values on each chart). Data acquisition runs up to 2 minutes.

Preparation of data and setting xy-graphs updated seems to be a big bottleneck. For this I wrote a simple point of interest, by comparing the xy-graph and table diagram performance clearify. For the same amount of data, the chart table is about 3 times faster, according to the ability to draw only the last value again. The xy-graph must update the whole plot of each iteration.

If I also remove the preparation of complex data of the xy-chart, the chart diagram is up to 6 times faster.

Landmark xy-graph

Diagram graph of reference (including the preparation of data for chart xy)

Benchmark graph diagram (without preparation of data for chart xy)

Questions

-Are there a way to optimize the data part of preparation of the xy-graph?

-Is it possible to draw only the last value again in a xy chart as a graphic diagram?

Why can I not use a graphic diagram?

-Because the time base is not constant.

My ideas:

(1.) during measurement, I use a graphical diagram. I know that there will be some failure according to the variable time base. After the acquisition of the acquired data will be shown in xy-graphs (as an only necessary update) with the good time base.

2.), I show all the data in a xy chart. Maybe just values the last 1000 would be sufficient.

XY-graph with simply display the last 1000 values of reference

Are there other ideas how to speed up xy-graphs?

Thank you very much and best regards,

Michael

MichaGue_01 wrote:

Why can I not use a graphic diagram?

-Because the time base is not constant.

This does not mean that you cannot use a chart.  You should read my injurywaveform charts nugget.  As long as you acquire your DAQmx device signals, you can wire all your signals directly in the table and it will load the time base.

Tags: NI Software

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