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Sorry to be tedious Phil, you don't have to answer. I'm trying to measure the noise of the 100k resistor to 1% (or so). That tells me Boltzmann's constant if I know the temperature. So the 10nV/rtHz is a few percent of the ~40nV of thermal noise from the resistor. ( a few percent of the noise power.)
George H.
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OK first two follower's looking at different R's (same value). Then hook each amp to the same R. Increase in correlated noise is due to current noise from each amp.
George H.
The first measurement is really just a sanity check, to make sure that the measured correlation is low enough. If it is, just use the second measurement by itself. Otherwise it'll take three or four times as long to get a measurement of the same quality.
(The fluctuations in the correlation require averaging for a long time if the noise you're looking for is way way below the other noise sources.)
Cheers
Phil Hobbs
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