The difference between multimeters using resistance, current and voltage files
1. Resistance gear: Treat the multimeter as a power supply and a voltmeter, connect the multimeter and the circuit in series, provide a certain voltage to the circuit under test, and then sample the current of the circuit after adding the load. Thereby, the resistance value of the side circuit is calculated. (Note: the circuit should not be powered on during the test)
2. Current gear: Similar to an ammeter, connect the multimeter to the circuit in series to form a loop. The circuit is powered up. Be sure to test within the range. Otherwise it is easy to burn.
3. Voltage gear: similar to a voltmeter, connected in parallel to the two ends of the circuit under test, the circuit must be powered to measure the voltage.
If you measure a very long, long wire, how should you judge the quality?
Are the long lines bundled together and placed by your side? If not, it is difficult to measure with a multimeter. If it is placed by your side, connect the 2 ends of the bundled wire to the 2 test pens of the multimeter, and the multimeter can be turned to the "resistance gear" of about 2K.
