S hitrim razvojem kitajske industrije električne opreme bodo komponente električnih stikov, ki se pogosto uporabljajo v električni opremi, kot so napajalni in komunikacijski sistemi . Če stik napake električnega sistema, neposredno vpliva measure contact performance of contact resistance is a basic and important parameters, directly affect the contact electrical contact behavior is good or bad. Contact the contact resistance is too high, will produce larger temperature rise, even welding phenomena occur, both affect contact work reliability, and reduce the service life of the contact. And contact resistance research has become the key problem in the contact reliability testing, and often to contact resistance to measure the Stopnja zanesljivosti kontaktnega sistema ", da kontaktni upor presega določeno določeno vrednost kot glavno merilo okvare kontaktne komponente .
Cattle contact resistance refers to a pair of contact resistance of contact area when I touch each other. It consists of shrinkage on the surface of the touch point contact resistance and the resistance of surface film.Two contact contact with each other, due to the contact surface can't be done very ideal, contact the actual contact area is composed of many conductive spots, current, flows through these several conductive spots scattered, shrinkage occurs, contact Odpornost rezultata, imenovana odpornost krčenja . kontaktna površina zaradi onesnaževanja, kemične korozije, slabo lahko tvori plast prevodne materiale (vključno z prašnimi delci, preostalimi abrazivi ali poliranjem, organskimi in anorganskimi membranami itd.
