Figure 3 shows the rms field distributions computed for a triangle power line with distance s = 4 m and balanced currents I = 800 A rms.
By assuming balanced currents for circuits a and b, and a phase angle displacement [delta] between phases 1a - 1b, the general relationship (2) can be rewritten in the following form:
New circuit of small resistance changes measurement by using digitally balanced currents with one digitally regulated current source is proposed and investigated.
In earlier works it has been shown that better results are obtained with the proposed digitally balanced Wheatstone bridge circuits and circuits using digitally balanced current sources  which are investigated in this paper.
Since the VNA calibration coefficients are designed to correct for balanced currents
, using the unbalanced load can add error to the calibration.