Quoi équipement fait la fuite multimètre jouer ? Comment mesurer fuite avec numérique multimètre
Mesurez la masse tension de l’équipement avec AC tension quand il est sous tension. dans le cas de puissance défaillance, mesurer la mise à la terre résistance de la électrifiée pièce avec électrique bloc.
Grave fuite peut être trouvé out par utilisation la résistance fichier de multimètre, mais si la fuite est not grave, le multimètre can't mesure it; There are special isolation résistance testeurs for measuring isolation, such as shaking table and digital megger, which can simulate the real working voltage, and the test voltage of multimeter is très low.
First, ask the repair user what the fault phenomenon is and what the obvious characteristics are; Second, observe whether there is any intuitive fault point from the surface, and then carry out the next inspection.
1. First disconnect the main isolating switch of the user's power supply, and turn off all power loads of the user, such as unplugging the réfrigérateur and disconnecting the water pump switch.
2. Put the gear of the digital multimeter on the 200M gear of the ohm gear, put one stylus on one of the two outgoing lines on the load side, and touch the wall with the other stylus, preferably touching the grounding wire or temporary grounding wire. After the number displayed on the multimeter is stable, the insulation resistance value of the main line is read out. If the isolation resistance value is less than 0.5 megohm, there is something wrong with the main line. If the insulation resistance is above 0.5 megohm, it can be ruled out that there is something wrong with the main line. Measure the other wire in the same way, and also check the value to see if there is something wrong with the main line.
3. Check the isolation resistance values of the shunt and all electrical appliances, and test them one by one in the same way until the fault point is found.
Précautions pour fonctionnement
1. Quand utilisation le 200M bloc du multimètre ohm bloc, be attention pas à toucher le métal partie de le stylet par main pendant mesure, qui rendra la lecture inexacte.
2. Pay attention to discharge first when measuring each electrical equipment to prevent the capacitive current in the electrical equipment from hurting people.
This method is a safe way to find the fault point when there is no electricity. This method is also appropriable for power users and power plant leakage search, but when searching, it is necessary to disconnect not only the incoming line of power supply, but also the zero line to avoid electric shock accidents.
