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probe_station [2012/11/21 13:05]
landon [Using the fluid cell]
probe_station [2013/06/15 10:37] (current)
ethanminot [Noise]
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 ===== Noise ===== ===== Noise =====
 +The current through a CNT or graphene device will always fluctuate due to [[http://​first-quantum.net/​forStudents/​lecture/​pdf/​noise/​chapter9.pdf|1/​f noise]]. This noise is intrinsic to any electrical measurement we perform. However, other types of noise which are unrelated to the device need to be minimized. External noise sources typically show up as spikes in the power spectral density of current fluctuations. In the most extreme cases, you can actually see sinusoidal oscillations in your current measurement. ​
 +
 The most common reason for unusually high noise can be fixed by connecting the shield on the BNC wires which carry source, drain and gate signals (see Figure below). The most common reason for unusually high noise can be fixed by connecting the shield on the BNC wires which carry source, drain and gate signals (see Figure below).
  
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 [[noise|Other noise considerations]] ​ [[noise|Other noise considerations]] ​
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 ===== Using the fluid cell ===== ===== Using the fluid cell =====
 == Tips == == Tips ==

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