How to Measure resistance of digital multimter Professional?
Resistance is measured at the electrical barrier. Resistance values vary widely, from a few milliohms (mΩ) for contact resistance to billions of ohms for insulation resistance. Many DMMs measure resistances as small as 0.1 ohms, and some measurements can be as high as 300 megohms (300,000,000ohms). If the resistance is extremely large, the Fluke multimeter will display "OL", indicating that the measured resistance exceeds the range. When measuring an open circuit, "OL" is displayed.
Rhaid mesur ymwrthedd gyda phŵer cylched i ffwrdd, fel arall bydd difrod i'r mesurydd neu'r bwrdd cylched yn digwydd. Mae rhai amlfesuryddion digidol yn darparu swyddogaeth amddiffyn pan fydd signal foltedd wedi'i gysylltu ar gam yn y modd gwrthiant. Mae gan wahanol fodelau o DMMs alluoedd amddiffyn gwahanol.
For accurate measurements of low resistance, the resistance of the measuring lead must be subtracted from the measured value. Typical test lead resistance values are between {{0}}.2Ω and 0.5Ω. If the resistance of the test leads is greater than 1Ω, the test leads should be replaced.
Os yw'r multimedr digidol yn cyflenwi llai na 0.6V foltedd DC i fesur y gwrthiant, gall fesur gwerth gwrthiant y bwrdd cylched wedi'i ynysu gan y deuod neu'r lled-ddargludydd. Gellir ei brofi heb dynnu'r gwrthydd.
