How do you use a wiring check multimeter?
To measure whether the line is connected, you can use a multimeter ohms gear measurement. Measurement, to choose the meter pointer close to deflection 0 ohms gear. If the line in the circuit, to the line at one end (A end) to the multimeter (red pen) 100 ohms, black pen to measure the other end of the line (B end), the results of the measurement is zero, then, that is, the line is also called a through road, only through the circuit, there is a current through the circuit; if the measurement of the line from the A end of the line to the end of the B at the multimeter ohms file meter pointer is not close to the zero ohms, if the line is already in an open state, the line is also called through road, only through road, circuit through; if measured to the line at the A end to the end of the B at the multimeter ohms file meter pointer is not close to the zero ohms, then, the line has been in an open state, the line is not in the state, the line has been in the state of open circuit, the line is not in the state of open circuit. This line has been in the open state, disconnection is called a broken or open circuit.
Multimeter instructions
The following is an example of the MF30 multimeter to illustrate the reading of the multimeter. The first scale is the resistance value indication, the leftmost end is infinity, the right end is zero, among which the scale is uneven. Resistance file R × 1, R × 10, R × 100, R × 1K, R × 10K files, respectively, the indication of the scale and then multiplied by a multiple of the actual resistance value (in ohms).
For example, R × 100 gear to measure a resistance, the pointer indicates that "10", then its resistance value of 10 × 100 = 1000, that is, 1 K. The second scale is a common 500V and 500mA gear, it should be noted that the voltage gear, current gear instructions are different from the principle of the resistance gear, such as the 5V gear means that the gear can only measure the voltage below 5V, 500mA gear, 500mA gear. For example, 5V means that the meter can only measure the voltage below 5V, and 500mA can only measure the current below 500mA, if it exceeds the range, it will damage the multimeter.
Note: The multimeter should be placed horizontally when used. The red pen is inserted in the + hole, and the black pen is inserted in the - hole. Test the current with the current gear, and can not be mistakenly used voltage gear, resistance block, and other similar, otherwise the light will burn the fuse in the multimeter, or damage the meter head. If you don't know the range beforehand, try to measure the maximum range, then disconnect the measuring circuit and then change the gear, and don't change the range in the case of the line. If the meter needle deflects quickly to the bottom, disconnect the circuit and check it immediately.
Finally, there is a rule, that is, after the agreement to use the multimeter to the range switch to the highest AC voltage, in order to prevent others from accidentally measuring 220V mains voltage and damage.
