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.
Takist tuleb mõõta väljalülitatud vooluahelaga, vastasel juhul kahjustatakse arvestit või trükkplaati. Mõned digitaalsed multimeetrid pakuvad kaitsefunktsiooni, kui pingesignaal ühendatakse ekslikult takistusrežiimis. Erinevatel DMM-ide mudelitel on erinevad kaitsevõimalused.
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.
Kui digitaalne multimeeter annab takistuse mõõtmiseks alla 0,6 V alalispinge, saab see mõõta dioodi või pooljuhiga isoleeritud trükkplaadi takistuse väärtust. Seda saab testida ilma takistit eemaldamata.
