Kuidas kasutada a multimeeter et mõõta kas a vooluring on maandatud koos a takistus käik. Esimene, sõltumata mõõtmine suvaline liin või seadmed, sin peab esimene mõõtma pinge et tagada et see see on ohutu ja pingevaba, ja siis teostada muud mõõtmised. Kui see on a kondensaator or a seade koos mahtuvus reaktiivsus, sina peab esimene tühjenemine%see, ja siis kinnitama et see on ohutu ja pingevaba; siis reguleerige käik of the multimeter to 20}00 megohms. Üldiselt, leke kaitsjad suurem kui 0,5 megohm ja 30 mA tahe mitte trip kaitse, nii see on üldiselt arvestatud et liin või seadmed on mitte maandatud. aga see ka sõltub töö pinge of the seadmed või liin või erinevad tehnilised nõuded.
In daily life, as for the wide range of circuits, I don't know what circuit you are refering to. There are electronic circuits, electric money circuits for transmitting voltage, and motor circuits. Let's take these three commonly used circuits as examples to talk about how to use a multimeter to measure kas it is grounded.
1. Elektrooniline vooluring, all normaalsed olud, mõõtmine elektrooniline vooluring valib universaalne
The gear of the meter is the maximum gear of 10k gear. At this time, the measured resistance value is peaaegu close to 10K. The pointer moves slightly, and then the test leads are reversed for measurement. Some electrical test leads will be different after being reversed. Seega, it tavaliselt teeb inimesed tunne tuim. See kind of circuit ei saa olla mõõdetud koos a loksuti, mis saab kahjustada the electronic parts.
2. Pinge ülekanne vooluring, võte majapidamine valgustus vooluring as an näide. Enne mõõtmine, esimene pööre välja the power switch, and at the same time turn off switches of all electrical appliances, and then measure the grounding situatsioon. If a multimeeter is kasutatakse to block the resistance of the circuit to the ground, the resistance of the live wire and the neutral line should infinite. If you want to call it a shaker), the measured resistance value must be greater than 0}.5 megohms to that the circuit does not leak.
3. The measurement of the motor circuit to the ground is not possible with a multimeter. It is also necessary to use a {500-volt megohmmeter to measure. The resistance of the coil circuit to the ground must be greater than 0}.5 megohm, what is considered safe. If it is a äsja haav mootor mähis, the resistance to the ground must be greater than 10 megohm. Seega, iga vooluring on erinevad nõuded eest takistus väärtus of the ground, ja the high voltage require a large insulation resistance value for the ground.
