Grounding systems II

Ground Loop

In = Induced noise current Vn = noise voltage

Vn = In * Rs

  • Definition : A ground circuit allowing ground currents to flow in a loop causing two problems.

  • When noise voltage is induced due to magnetic coupling, the resulting induced current causes voltages in the signal.

  • The return current may take a path further away from the signal current and create a radiating loop.

  • Solution : Use a shielded cable and do not use the shield as a return conductor. (i. e. use either a twisted shielded pair or a tri axial cable.)

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