Some of the adva ntages of fo ur-pa ir adm itta nce standard s and so me of the s pec ial prob le ms encoun tered in th eir meas ure ment are po inted ou t. De tailed descriptions of three di stin ct type s of fourpa ir brid ges and so me of th e ir limitations are presented. Th ese three brid ges form a vita l part of a very precise absolute meas ure ment of re sistan ce based on a calculable capacitor be in g undertaken a t th e Na ti onal Bureau of S tanda rd s, but are believed to be of more general usefu lness.Key word s: AC di rec t-readin g ratio se t; ac measure me nt s; brid ge; coaxial c hokes ; defi ning tran sformers ; equal power bridge; four-pair sta ndard s; frequency-dep e nd ent bridge; quadratu re brid ge.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.