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real time adquisition
feuerwehr
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02-13-2004 02:32 AM
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I'm tryin to get a real time signal into my computer, it's realy important to get this signal in an accurate way, but every time I move the mouse the signal sample is way much faster than the signal captured without moving it...and I really need a continous sample no mather what happens in the computer..I mean if somebody is moving the mouse or playing with it, the time sample should be the same...What can I do?
Thanks
Carlos
Thanks
Carlos
Methis Elddir
Member
02-13-2004 10:05 AM
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On Fri, 13 Feb 2004 02:32:11 -0600, feuerwehr wrote:
> I'm tryin to get a real time signal into my computer, it's realy
> important to get this signal in an accurate way, but every time I move
> the mouse the signal sample is way much faster than the signal captured
> without moving it...and I really need a continous sample no mather what
> happens in the computer..I mean if somebody is moving the mouse or
> playing with it, the time sample should be the same...What can I do?
> Thanks
> Carlos
Hi Carlos,
Looks like you need either a card with an onboard DSP like what UEI
provides (www.ueidaq.com) or you need to run a real-time operating system.
BTW, I doubt you're trying to collect real-time signals using GPIB. Your
questions have a better chance of getti
ng answered in these groups:
natinst.public.daq.real-time.general
natinst.public.labview.real-time.general
I'm using a news reader so I have no idea what these look like on NI's
website.
> I'm tryin to get a real time signal into my computer, it's realy
> important to get this signal in an accurate way, but every time I move
> the mouse the signal sample is way much faster than the signal captured
> without moving it...and I really need a continous sample no mather what
> happens in the computer..I mean if somebody is moving the mouse or
> playing with it, the time sample should be the same...What can I do?
> Thanks
> Carlos
Hi Carlos,
Looks like you need either a card with an onboard DSP like what UEI
provides (www.ueidaq.com) or you need to run a real-time operating system.
BTW, I doubt you're trying to collect real-time signals using GPIB. Your
questions have a better chance of getti
ng answered in these groups:
natinst.public.daq.real-time.general
natinst.public.labview.real-time.general
I'm using a news reader so I have no idea what these look like on NI's
website.
Sean_C.
Active Participant
02-13-2004 04:07 PM
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Hello Carlos,
Thank you for contacting National Instruments.
Would you please respond with what hardware and software you are using to acquire this data? It would also be helpful if you posted the code you are using.
I will be happy to help when you respond with more information.
Sean C.
Applications Engineering
National Instruments
Thank you for contacting National Instruments.
Would you please respond with what hardware and software you are using to acquire this data? It would also be helpful if you posted the code you are using.
I will be happy to help when you respond with more information.
Sean C.
Applications Engineering
National Instruments
Matthew C
NI Employee (retired)
02-13-2004 04:58 PM
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Hello feuerwehr,
Thank you for contacting National Instruments.
I am assuming that you are using a DAQ card to acquire your signal.
One possible solution is to use an external clock to acquire your signal instead of using software timing (i.e. loops and weight functions in LabVIEW). Software timing is subject to inconsistencies caused by the load placed on your processor by background tasks.
I hope this helps! If you have further questions, let me know.
Matthew C
Applications Engineer
National Instruments
Thank you for contacting National Instruments.
I am assuming that you are using a DAQ card to acquire your signal.
One possible solution is to use an external clock to acquire your signal instead of using software timing (i.e. loops and weight functions in LabVIEW). Software timing is subject to inconsistencies caused by the load placed on your processor by background tasks.
I hope this helps! If you have further questions, let me know.
Matthew C
Applications Engineer
National Instruments
