08-05-2005 04:32 AM
08-08-2005 06:23 AM
Hi,
what are you using in terms of hardware and software?
MIO board (m-series, e-series etc), analog output board (6711 etc), or high speed arbitrary waveform 5421?
Labview, LabWindows CVI, Signal express visual studio etc? What version?
What driver versions?
For AO at 1MHz, you're going to need something that can generate at atlease 10MHz, just to get 10 points in the waveform cycle.
LabVIEW 6i
LabVIEW 7.1
High speed arb
Signal Express
Thanks
Sacha Emery
National Instruments (UK)
08-08-2005 09:51 AM
Hi
Many thanks for your reply. I am using Labview 7.1 and Daqmx 3.1. I am having a M6259 daq card. My requirement is to find the frequency response of a speaker by driving it with a swept sine wave from 0 to 1000 Hz and obtain its' spectrum using a mic and a spectrum analyser. For this I want to drive the speaker with swept sine wave signal genearated by labview. Can you help me on this. The links given didn't open up.
Thanks
Mal
08-09-2005 09:59 AM
Hi,
the maximum analog output update rate on the 6259 is only
1 channel..................................... 2.86 MS/s
2 channels ................................... 2.00 MS/s
3 channels ................................... 1.54 MS/s
4 channels ................................... 1.25 MS/s
08-10-2005 11:57 AM
Hi
Thanks for the reply. I wired a PSD vi to the program to view how the spectrum moves from 0 to 1000 Hz. However I don't see any movement. Can you please see whether there is an ommission on my part.
Many Thanks
Mal
08-11-2005 04:03 AM
08-12-2005 05:19 AM
Hi
Many thanks. The programme works fine and I get the varying tone from a speaker connected to my M6259 card. I hope to pick up this tone through a mic and with suitable preamplification connect it back again to the M6259 as an input signal. I hope to see the spectrum of this signal using the PSD vi. To do this should I place a while loop arround it or not?
Mal
08-18-2005 06:06 AM
Hi,
the AI would need starting before the AO, otherwise you'll lose some information.
If you want to do it repetitively putting a while loop around it will leave breaks in the data whilst it reconfigures.
Look at a continuous setup instead, and keep feeding the AO repetitively without reconfigureing after setting up for a continuous AI.
Search for things like simultaneous AI and AO.
Hope that helps
Sacha Emery
National Instruments (UK)
02-16-2006 01:18 PM
Hi
How can I make the programme to generate signals beyond 5000 Hz up to 10000 Hz. When I tried this (ie making fend 10000 Hz) the signal increases upto 5000 Hz and reduces back again to zero.
Thanks
Mal
02-17-2006 04:21 AM
Hi,
if you've modified your code, can you please re-post it so I can see how you're approaching this now?
Thanks
Sacha Emery
National Instruments (UK)