We tried to measure the Boltzman constant, conducting the Johnson experiment.
We ploted V RMS vs the resistance and we get that for the higher resistances we lose the linear conection. We don't know how to explain it, and thought that it might be connected to this paragraph from Johnson's article (1928):
"If the input element and the amplifier are so chosen that R(omega) does not change much over the frequency range of the amplifier, then it is permissible to use the mean value of R(omega), obtained to a sufficient degree of approximation by replacing co by coo, the frequency of maximum amplification."
But he doesn't specify the considerations.
If anyone knows the reason to this phenomena it would be a great help.
Hi.,
Johnson–Nyquist noise (thermal noise, Johnson noise, or Nyquist noise) is the electronic noise generated by the thermal agitation of the charge carriers (usually the electrons) inside an electrical conductor at equilibrium, which happens regardless of any applied voltage.
The intrinsic noise is a result of the thermal jitter of the charge carriers and the quantization of charge. ... To measure the properties of Johnson noise in a variety of conductors and over a substantial range of temperature and to compare the results with the Nyquist theory.The noise level is dependent only upon the temperature and the value of the resistance. Therefore the only ways to reduce the thermal noise content are to reduce the temperature of operation, or reduce the value of the resistors in the circuit.Reduction of Johnson Noise is accomplished most easily by:
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