So which is the solution for this problem we have seen now?
We need shields.
- This is an electrical shield, that means a metallic surface, and by putting this surface to a fixed voltage, usually ground, we avoid to have any part of the circuit exposed to external electrical field.
Because you know that inside the closed metallic surface, the electrical field is zero, due to the high mobility of charges. - Shields are especially useful when I can’t use a current amplifier.
So a very low input resistance frontend. - Since we are speaking about quite low frequencies, we enclose everything (Here I put only the cable because it’s the most large exposed metallic part, so the most prone to disturbances, but possibly we would want to enclose everything)
- This time, this new is for sure much smaller than the one we have seen before, because the area which is not enclosed in the metal shield is as small as possible.
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