Avoid jitter in simultaneous analog i/o?

[Adriman]

Hi everyone!

Does anyone know how to avoid or, at least, shorten jitter when acquiring and generating data at the same time? I can acquire data and generate any signal at any frequency with no jiiter as long as the such signal is not udpdated. So to say, it happens every time AO Write VI is used.

However, I must update it at certain rate because this a feedback program. Briefly, first a waveform is generated and outputted so it produces changes in my physical systems, changes that are measured. Then, measured data is added to the former waveform and so forth. Attached are the VI files.

I have LV Real Time installled in my computer but not sure whether it is worth trying since I do not have the proper hardware for such software:

OS: Windows XP

Hardware: IO Tech DaqBoard 2000

I/O: IO Tech DBK202

LabView 8.2

Any lead?

Thanks & regards!

Adrian

[Burban]

Adrian,

You likely will need to reduce the amount of processing done during each loop.  I'm not familiar with your DAQ device, but if you are seeing a lot of jitter it could be that your computer can't keep up with the processing required.  You could try reducing the complexity of the front panel, or reducing the number of samples aquired.