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%matplotlib inline

Show noise levels from empty room data

This shows how to use :meth:mne.io.Raw.plot_psd to examine noise levels of systems. See [1]_ for an example.

References

.. [1] Khan S, Cohen D (2013). Note: Magnetic noise from the inner wall of a magnetically shielded room. Review of Scientific Instruments 84:56101. https://doi.org/10.1063/1.4802845



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# Author: Eric Larson <larson.eric.d@gmail.com>
#
# License: BSD (3-clause)

import os.path as op
import mne

data_path = mne.datasets.sample.data_path()

raw_erm = mne.io.read_raw_fif(op.join(data_path, 'MEG', 'sample',
                                      'ernoise_raw.fif'), preload=True)

We can plot the absolute noise levels:



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raw_erm.plot_psd(tmax=10., average=True, dB=False, xscale='log')