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Reading data from sound card

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Hi Everyone,

I am reading data through the sound card of pc, the signal is generated from a signal generator. The problem is that the signal i have applied has a peak to peak voltage of 100 mV (frequency 100Hz) but what i am getting from the labview is peak to peak voltage of 0.547 units.  How can i correct it.

My other question is

 how to write a FFT data in a file.

The program file is attached.

 

Thanks

Chandan


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