Method and system of calculating resistivity of an earth formation

An apparatus comprising:

• a first current source current return (CSCR) pair that comprises a current return disposed above a first current source, the first current return receives current from the first current source;
• a second CSCR pair disposed along a longitudinal axis of said apparatus from the first CSCR pair, the second CSCR pair comprises a second current return disposed below a second current source, the second current return receives current from the second current source;
• and
• a monitor electrode disposed between the first CSCR pair and the second CSCR pair, a distance between the first current source and the monitor electrode is substantially equal to the distance between the second current source and the monitor electrode, and the monitor electrode monitors the current transmitted by the current sources.

A compensated resistivity tool comprising:

• a first current source;
• a first current return disposed above the first current source, the first current source and first current return define a first current-source current-return (CSCR) pair;
• a second current source disposed below the first current source;
• a second current return disposed below the second current source, the second current source and second current return define a second CSCR pair;
• a monitor electrode disposed between the first current source and the second current source, wherein a location of the monitor electrode defines a symmetry point between the first CSCR pair the second CSCR pair.