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Analog interface to get an audio analyser from a soundcard
Analog interface to get an audio analyser from a soundcard
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Old 1st November 2019, 01:39 AM   #11
trobbins is offline trobbins  Australia
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Join Date: Feb 2009
Location: Melbourne, Oz
I've battery powered my soundcard, and have a battery powered USB isolator, and can use a laptop, as means to suppress mains borne earth loop currents from the amplifier-under-test's connection between ground and mains PE.

For valve amps I renovate I make an effort to link input and output grounds with minimum opportunity for noise insertion in that link within the amp.

Other practical issues that can degrade the noise floor, as others have noticed, is to be careful of nearby noise sources (such as bench lamps) and connecting other mains powered instruments to the DUT.

Just saying that with a bit of care, single-ended test setups for some applications can provide a noise floor well under the DUT noise floor.
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