Applegate, Charles E. Formerly, Consulting Engineer, Weston, Massachusetts.
Kibble, Bryan P. Division of Electrical Science, National Physical Laboratory, Teddington, Middlesex, United Kingdom.
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A specialized version of the Wheatstone bridge network designed to eliminate, or greatly reduce, the effect of lead and contact resistance and thus permit accurate measurement of low resistance. The circuit shown in illus. a accomplishes this by effectively placing relatively high-resistance-ratio arms in series with the potential leads and contacts of the low-resistance standards and the unknown resistance. In this circuit RA and RB are the main ratio resistors, Ra and Rb the auxiliary ratio, Rx the unknown, Rs the standard, and Ry a heavy copper yoke of low resistance connected between the unknown and standard resistors.
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