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.
Ní mór an fhriotaíocht a thomhas le cumhacht ciorcad as, ar shlí eile déanfar damáiste don mhéadar nó don chlár ciorcad. Soláthraíonn roinnt iliméadair digiteach feidhm chosanta nuair a bhíonn comhartha voltais ceangailte go mícheart i mód friotaíochta. Tá cumais chosanta éagsúla ag samhlacha éagsúla DMManna.
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.
Má sholáthraíonn an iliméadair digiteach níos lú ná 0.6V voltas DC chun an fhriotaíocht a thomhas, is féidir leis luach friotaíochta an bhoird chuaird a aonrú ag an dé-óid nó leathsheoltóir a thomhas. Is féidir é a thástáil gan an friotóir a bhaint.
