What kind of multimeter is best for a beginner electrician to buy?
A multimeter is one of the necessary tools for electrical workers or electronic circuit enthusiasts. The choice of a multimeter still depends on the actual situation. All brands have the functions of multimeters. It is best to choose the one that suits you.
For example, electrician friends who use multimeters often use AC and DC voltages, resistance settings, on-off beep settings, and capacitance settings. As long as they are voltage settings, resistance settings, capacitance settings, and the range is sufficient.
If it is used in electronic circuits, in addition to meeting the previous conditions, it must also have a three-stage tube measurement position and a temperature measurement position. In particular, the capacitance measurement gear must meet the measurement needs. Many of the capacitors on the circuit board have a capacity of 1 picofarad. Therefore, the capacitance measurement range of the multimeter must be able to measure components with small capacities on electronic circuits. To measure capacitance, some multimeters need to plug the pins of the capacitor into the capacitance measurement port on the meter for measurement. Some multimeters do not need to be plugged into the meter for measurement. You only need to adjust the gear to the capacitance measurement position and use two test leads. Directly measure the capacitance of the capacitor.
Multimeters have manual range and automatic range, and there are also manual range and automatic range that are compatible. The advantage of automatic range is that it can avoid burning the multimeter by setting the wrong measurement range. Of course, its price is higher than that of manual range multimeters. High. In short, there are many brands and styles of multimeters. It is best to choose the one that suits you.
How to check short circuit with multimeter
A short circuit means that two wires that should not be connected are connected. A short circuit is between phases and between phases and ground. One is a phase-to-phase short circuit and the other is a ground short circuit; an open circuit is that a wire that should be connected is not connected. Grounding is relative to ground, and grounding is divided into dead ground. The larger the resistance between phase and ground, the better. A small resistance is called leakage.
When measuring with a multimeter, the larger the phase-to-phase resistance, the better. A small resistance between phases is called phase-to-phase leakage, and a zero resistance is called a phase-to-phase short circuit.
Use a multimeter to measure both ends of a wire. The resistance is zero. This wire is connected. The resistance of infinite ∞ is an open circuit. Sometimes the resistance is zero and sometimes not, indicating that the line is virtually connected or disconnected.
Place a wire on the ground, with both ends guided so as not to touch the ground. Connect one end of the test lead to the line and the other to the earth. The larger the resistance, the better, indicating a high bonding value. A small resistance indicates leakage and poor insulation performance. Generally, it is not less than 0.5 megohm. The state stipulates 1V1 ohm. Wires with resistance lower than this should be scrapped.
