One or mo re lurn s of coaxi a l cab le on a ma gne li c co re form a coax ial c ho ke whi ch may be used to s uppress unwa nted loop c urre nl s in a-c brid ge c irc uil s. A re vi e w of se ve ra l app lic aliun s of co axial c ho kes to a-c brid ge c irc uit s is prese nt ed . T hese appl icat ion s in c lud e s up p ress ing ground loop c urre nt s, ass urin g uniqu e de finiti on in th e meas ure me nl o f s mall 3-te rrnin a l ca pac it o rs, redu c in g s tray magnetic fi e ld a nd re du c in g volt age d ro ps in leads ca used b y la rge ground ca pac itan ce c urre nt. Th e re is a lso a d isc uss ion of tec hniques fo r gr ea tl y inc reas ing the e ffec tiv e ness of the coax ia l c ho ke.Ke y Wo rd s : Brid ge, ca pac itan ce , coax ia l ca ble, ground loo p , indu c ta nce, magne ti c co re, s tray magne t ic fi e ld.
A me thod of measuring small mutual inductances is presented. The small est indu c tor meas ured was 0.1 /-tH . The circuit is a transform e r·ratio· arm brid ge with multipl e balances and is desc rib ed in detail. Uncertainti es are of the order of one part in 10 7 • Several id eas for th e design and constru ction of suitable mutual inductance standard s are presented.
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