Why graphic ActiveX lagging during the race?

I work with GRAPHIC trend ActiveX in a compiled Labview application EXE. An acquisition of data acquired datas 77Hz, a sample at a time, a table displays the last 30 minutes. But I see only 5 minutes of screen. After 2 days, start and stop of trends, 2 (constant) values that are saved in activeX as upper and lower limits of the signal, begins to lag. The main signal of data acquisition is OK but 2 constants appear with 15 s delay.

After 1 week, 1 minute lag is observed on the screen of the main signal and 2 minutes on 2 constants.

Why? and how can I fix this problem?

I use 2 loops with queue for the acquisition and treatment. I use the Quad Core CPU with 2 gig of RAM, and Windows Vista.

Hello!

I finally found the problem.

Even if I was using very good machines, 2 three feathers begins trolling after 1 day.

The reason is that these 2 signals was set as an Integer, and the other is a waveform. Basic teas time 3 signals is not the same. We take the timestamps of the DAQ signal. The other two use the time on the computer. It seems that the clock two are not synchronized. I rebuilt a signal using the timestamp for the acquisition of data for integer values, and that's it!

Best regards

Tags: NI Software

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