To know whether the line is short-circuited or not, first cut off the line, then open all the load switches and block the resistance between the two lines with the ohm gear of the multimeter. In general, the higher the resistance, the better. If you judge whether the line is grounded, you can use the ohm gear of the multimeter. Measure the resistance of each line to ground. The greater the better. It is important to note that using a multimeter to measure the short and ground of a line is not accurate. how to test pcb board with a multimeter ?It shouldn't be, if the ground or short resistance is small, you can detect it with a multimeter. If the resistance is slightly larger, the multimeter won't check it.

First, you need to isolate the Fire, Zero, and Ground wires: AC voltage file on the multimeter, and the file is higher than 220 V. Insert the red stylus into the voltage hole, not the black stylus. Then insert the red stylus into one of the sockets and observe the reading. If the reading on the fire wire is the largest and the reading on the zero wire is smaller, then the reading on the ground wire will essentially not move.

If two readings are small and one is large, the ground wire is not grounded and the ground wire is also connected to the zero wire. The second step does not need to measure. The multimeter will be dialed to the "short circuit" test function (if there is no resistance test), the red and black probes are connected to the circuit ground and utility ground. If the test result is a short circuit or very low resistance, then the line is grounded,pcblink 1oz vs 2oz Copper otherwise it is not grounded.

To check the system for leakage and grounding, turn the multimeter on 200M. For example, to insulate by measuring technical equipment, connect one end of the meter pen to the equipment as well as the housing design or a ground, and the other end of the pen to the line. When measuring employing insulation, the hand should not touch the meter pen directly to prevent errors that may lead to student measurement data. Multimeter detection resistance file adjusted to 20K or 200K, turn off the total power supply and load power supply, with a multimeter a pen connected to the firewire, a pen ground line, view the different resistance values, and then it is a pen connected to the zero line, a pen ground line, watch and learn the change of the resistance value of two times, if there is a need for a time when the community appeared to be more than 7.3, or more than 14.1, indicating that there is a value of resistance of a time when the connected to the firewire or zero line leakage.