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.
Mæla verður viðnám með slökkt á rafrásinni, annars verður skemmd á mælinum eða hringrásinni. Sumir stafrænir margmælar veita verndaraðgerð þegar spennumerki er ranglega tengt í viðnámsstillingu. Mismunandi gerðir af DMM hafa mismunandi verndargetu.
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.
Ef stafræni margmælirinn gefur minna en 0.6V DC spennu til að mæla viðnámið, getur hann mælt viðnámsgildi hringrásarborðsins sem er einangrað af díóðu eða hálfleiðara. Það er hægt að prófa það án þess að fjarlægja viðnámið.
