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noise [2009/11/12 14:41]
ethanminot created
noise [2012/04/12 09:13] (current)
landon
Line 6: Line 6:
 Because our lab is not underground and we have fluorescent lighting we have to shield experiments from EM radiation. We currently have the probe station inside a cooper mesh Faraday cage (purchased from TMC). To see if this Faraday cage is sufficient, try the following experiment inside the Faraday cage:  Because our lab is not underground and we have fluorescent lighting we have to shield experiments from EM radiation. We currently have the probe station inside a cooper mesh Faraday cage (purchased from TMC). To see if this Faraday cage is sufficient, try the following experiment inside the Faraday cage: 
   *measure current noise through an unshielded resistor, compare this to current noise through the same resistor when the resistor is packaged inside a solid-metal project box.    *measure current noise through an unshielded resistor, compare this to current noise through the same resistor when the resistor is packaged inside a solid-metal project box. 
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-==== Star grounding ==== 
-Grounding the chassis of all electrical components in a star configuration is a common technique for eliminating ground loops and therefore minimizing pick-up of EM radiation. There is one central ground, with a wire radiating out to each piece of equipment. In its simplest form, star grounding means that you plug all measurement equipment into the same powerstrip on the wall. It is important to keep the ground on this power strip as quiet as possible. For example, the computer monitor should be plugged into a different powerstrip (different circuit). 
  
 [[http://​www.twpinc.com/​twpinc/​control/​category-price/​~category_id=TWPCAT_11|Copper mesh supplier]] [[http://​www.twpinc.com/​twpinc/​control/​category-price/​~category_id=TWPCAT_11|Copper mesh supplier]]

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