hardware implementation of white noise signal superimposed on dc and ac voltage

[danie]

Hello,
I have a question regarding implementation of a measurement system using LabVIEW.  I have a laptop PC and am using a USB GPIB.  So I want to superimpose a Gaussian white noise signal on top of a triangular waveform and dc bias voltage.  I'd like to filter the noise signal such that it is composed of frequencies between 500 Hz and 2 MHz.  I'm guessing I will need a DAQ as well, but then can I use my other signal generation equipment (old HP giants) which probably don't have USB ports?  And will I need a special noise function generator, or does the DAQ have this capability?
And can the software do my fltering or is that also done through the DAQ or through some other piece of equipment?
And with these frequencies, which DAQ would I need?--it seems like the high end ones have sample rates of 1.25kS/s (not sure exactly how this number relates to my frequency).
Thanks and I look forward to your answers,
Daniella

[Nick_Storton]

Hi Danie,

By far the easiest way of generating this kind of signal is to use one of the NI Arbitrary waveform generators, unfortunately for you they only come in PCI and PXI form factors so you will not get one for your laptop. The Arbs are easily capable of producing this Kind of signal and the SignalExpress software package is definately the easiest way of generating the signal data to download to the Arb.

Hope this helps,

Nick

[danie]

Thanks Nick,

I wonder what NI's return policy on GPIBs is...

[Daniel_L]

Hi Danie,

Depending on the purchase date of your USB-GPIB board, you still may be able to return it under warranty.  You should be able to create a service request online at www.ni.com/support, call into our phone support under the GPIB product queue, and have an applications engineer determine if the item is still under warranty.  Moreover, if you would like some help in determining the right function generator for you, you can also ask to speak with an applications engineer about that as well.

Hope this helps,

Daniel L.
Applications Engineer
National Instruments