This is the correct way to use a multimeter. Did the old electrician use it correctly?

(1) The use of a multimeter to develop a good habit, is to take a look before each measurement gear placement is correct. Formed such a habit, the probability of burning table will be greatly reduced.

② It is more accurate to read the data of the display screen after it is stable. If you do not know the size of the measured voltage and current, you should choose a large range stop, and then readjust the range according to the reading size, so that the reading is accurate.

(3) When measuring resistance, it is necessary to reset the range after changing the stop, so that the reading can be accurate. If the zero position is not adjusted, it indicates that the battery voltage in the table is insufficient, and the battery should be replaced.

(4) When measuring the resistance online, the power supply should be cut off for operation, but also pay attention to whether there are other components and the resistance to be measured to form a parallel circuit, if necessary, the resistance can be welded from the circuit, then measurement. For the circuit with electrolytic capacitor, the capacitor should be discharged after the measurement.

⑤ When using a multimeter, you should develop the habit of not touching the metal part of the pen to prevent electric shock accidents. At the same time, when measuring resistance, such as touching the metal part of the pen will affect the reading.

⑥ When measuring DC voltage, the red pen is connected with "+" and the black pen is connected with "-" to prevent the chip from burning out. A digital multimeter can also measure the DC voltage when the polarity is not known. The "-" symbol will be displayed on the LCD when the inverter is connected. Especially do not misuse mA block or electric block to measure voltage, otherwise it will burn out the instrument.

⑦ When measuring the current, the instrument should be in series into the circuit under test. A multimeter can only measure DC current, but not AC current.

⑧ after the table is used up, the range switch should be placed in the highest voltage gear, for a short or disconnect the multimeter, it should be put to the corresponding gear, in order to prevent others from taking the use of attention and damage the instrument.