How to improve the speed of acquisition (in real time) of the 8 signals?

[gregt]

Hello,
I have a NI-1042 and a PC 3Ghz. I want to make acquisition with 40-20khz to treat medical signals.
But with the method that I use (with the examples read), I do not exceed 10khz with any treatment of the signals!
Can somebody send to me a VI of acquisition that he succeeds in making function with a frequence of 30khz or more because the councils I read did not help me.
Thank you in advance

[Stephan_A]

Hi,

just some questions to clarify your system setup.

1) Are you using a NI 1042 PXI chassis with a PXI controller built into or via MXI-3 connected to a PC?

2)Are you running LabVIEW RT or standard LabVIEW under Windows?
3) What IO HW do you use?

Regards

Stephan A.
National Instruments

[gregt]

Hi,
In the PXI chassis, I use an acquisition card "PXI-6071E"-> its specificity are (1.25 MS/s, 12-Bit, 64 Analog Input Multifunction DAQ ).
The connection between the PC and the PXI chassis is direct via an Ethernet card.

Moreover, indeed I run LabVIEW RT 7.0 under Windows XP.

You probably could not read Rtime.vi, I did not have insert all the subvis but all the subvis that I use come from the example of the module RT of National Instrument. (all the subvis are in the new library).

I think that to improve the transfer of data (between the PXI and the PC) I will have to transfer the datas of the 8 signals per packages using a buffer directly in the PXI. But I don't no how to make.(There is no example with "Real Time" functions.
Can you
give me an example please.

Thank you for you answer.

[Stephan_A]

Okay, there is still room for clarification.

This is what I understand, you are running a PXI Chassis 1042 with a PXI controller (what type of controller?) and a PXI 6071. The PXI chassis is running LabVIEW Realtime 7.0 instead of Windows. Correct?
Also the PXI controller is connected to your PC host system via Ethernet. Correct?

Regards

Stephan A.
National Instruments

[gregt]

Hi,

From now on I think that all informations will be clear.
Indeed I have one PXI-controller. This is a NI PXI-8186 embedded controller.
(I haven't buy the materials so I didn't know which were the separately bought cards from the chassis).
The PXI controller is connected to my PC host system via Ethernet (without being connected to Internet: the connexion is direct beetween the 2 process to avoid any problem of network.->authorized flow:(100M/s))

That advances, it 's cool and thank you.

[gregt]

Hello,

I would like to know if you know (or don't know) how to result this problem.
Please, could you give me an answer.
While waiting, I will try to contact National Instrument by phone because the materials (with Developers Suite) was bought a few months ago.

Regards

Greg T.