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2. Ground loop (electricity) - Wikipedia

   en.wikipedia.org/wiki/Ground_loop_(electricity)

   Group the cables involved in the ground loop into a bundle or snake. [3] The ground loop still exists, but the two sides of the loop are close together, so stray magnetic fields induce equal currents in both sides, which cancel out. Break in the shield Create a break in the signal cable shield conductor. [5] The break should be at the load end.

3. Isolation amplifier - Wikipedia

   en.wikipedia.org/wiki/Isolation_amplifier

   An isolated and quasi-balanced input (the floating common is typically connected to the (-) input of a differential amplifier). Suitable for off-ground measurements up to the breakdown voltage of the isolation barrier, and exhibits very good common mode rejection (100 db typical). Differential, floating common. An isolated and balanced input.

4. Sheath current filter - Wikipedia

   en.wikipedia.org/wiki/Sheath_current_filter

   These are common mode chokes, damping high-frequency common-mode noise on cables. They block to high-frequency common-mode currents above about 50 MHz and affect the signal and the ground connection is not in terms of their Low frequency properties or protective function. Ferrite sheath current filters cannot effectively attenuate ground loop ...

5. Galvanic isolation - Wikipedia

   en.wikipedia.org/wiki/Galvanic_isolation

   An opto-isolator is a very popular method of isolation in digital circuits. Cross-section of dual in-line package opto-isolators. Relative sizes of LED (red) and sensor (green) are exaggerated. Everlight EL817 phototransistor opto-isolator in DIP-4 package Halo TG110-S050N2RL 10/100BASE-TX Ethernet pulse transformer in SO-16 package.

6. Isolation transformer - Wikipedia

   en.wikipedia.org/wiki/Isolation_transformer

   A grounded Faraday shield between the primary and the secondary greatly reduces the coupling of common-mode noise. This may be another winding or a metal strip surrounding a winding. Differential noise can magnetically couple from the primary to the secondary of an isolation transformer, and must be filtered out if a problem occurs.

7. Isolated ground - Wikipedia

   en.wikipedia.org/wiki/Isolated_ground

   The primary reason for the use of isolated grounds (IG) is to provide a noise-free ground return, separate from the equipment grounding (EG) return. The EG circuit includes all of the metal conduit, outlet boxes, and metal enclosures that contain the wiring and must be grounded to provide a safe return path in case of fault currents.