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noise floor analyser

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Hello,
I made an audio analyser specifically to measure a DAC noise floor. It can measure a noise floor downto -165dBFs. Is is used like a sound card and the FFT is done is a computer.

noise_analyser_limit.gif
 
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wondering how that was accomplished.

The efforts where done mainly on the analog front end amplifier, multiple galvanic isolation to get the same result even when the equipment under test is connected to earth, in the ground/earth routing and in the power supply noise.

Yes it has become a commercial product, but for DIYers it can be an alternative to expensive high end audio analysers.
For DIYers high level measurements can be done by a sound card but very low noise measurement can't be done properly by a conventional sound card.
 
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