A study of absolute standards of mutual inductance and in particular the three-section National Bureau of Standards type
Frederick W. Grover · Journal of research of the National Bureau of Standards · 1954
The res ults of a study of t he number and location of the circles of zero fi eld surrounding a mul tisection co il are presen ted . The confi gura t ion of t he field surrounding the equatorial r eg ion of evera l three-section coils has been partially mapped out. One a rran ge me nt y ield s a design in which t he mu t ual-indu ctance contribution of any secondary t urn differs but li ttle from t hat of the medi an turn . By locating t he secondary symmetrically about the cir cles of zero fi eld , t he correction for winding distribution can be made s mall, an d thc effe ct of uncertainties in location of indi vidual secondary t urn s minimized.