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sound daq with usb-6008

hi, everybody, i'm using 6008 to measure sound output from my pc soundcard. when i output a pure sine wave (+/-1v), it is strange that i get in 6008 a 'polluted' sine wave, with large dc value and small sine wave amplitude. this has puzzled me for a long time. i checked some daq notes and used the differential daq method, with two 5k ohm resistance connected to the ai terminals and ground, but seemed nothing changed. can anyone explain this? 
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Try changing the sampling rate make it higher. i.e. if the signal is 500 Hz try smapling rate of 5KHz with samples to read about 1000. Also check your on the scope to make sure it is clean signal coming out of your sound card.

 

-Cheers

 

lab

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