How to reduce noise level on the DAQ AO?

Hello everyone,
I am using an analog output channel of a PCI-6014. The DAQ is sitting in a PC slot of a computer running Windows 2000. On the other side the DAQ is connected to an external (proprietary) conditioner box using the standard NI's shielded cable.
The problem is that the noise on the AO seems to be too high (around 2 mV peak-to-peak) depending on the computer load despite what is actually sent to that output. When the computer is really busy (booting up, linking an exectable, etc.), the noise level on the AO grows dramatically, while at the time the computer is idle, the noise level seems to be inside the spec range (around 1 LSB).
I replaced a computer power supply with a more powerful one, and moved the DAQ to the next PCI slot, but both measures gave just a minor improvement if any at all.
What can i do? Switch to a better-shielded or just different DAQ? Use a different form factor of the computer motherboard? What else?
I greatly appreciate your help.
Mike Faynberg

Mike,
The noise could possibly be coming from the 5V supply if it is really
noisy. Perhaps a more powerful (expensive) supply could help here?
As a last resort, I've heard of people wrapping DAQ cards in aluminum
foil (completely unsupported by NI). Of course, in order to prevent
shorting, you'd want to wrap it in something insulative first, like wax
paper. And while you are in the kitchen, could you whip me up a
sandwich?
Hope this helps,
Ryan Verret
Product Marketing Engineer
Signal Generators
National Instruments

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Acq_N_Scans_to_File_(wdt)_with_flicker.vi ‏127 KB

I apologize, one of the vi's that I sent was incorrect. I did, more or less, the same as the example you gave me. Like the example you gave me, it stops switching between grey levels momentarily while the DAQ captures the signal. Is it possible to have the two run simultaneously? I will attch the vi that I intended to send, and would appreciate any further ideas you may have on how to fix the problem.
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Acq_N_Scans_to_File_(wdt)_with_flicker_2while.vi ‏135 KB

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