Correct use of multimeter
Regarding the correct use of the multimeter, the precautions for the use and maintenance of the multimeter, the correct operation method of the multimeter when measuring voltage and current, and the correct handling method when the positive and negative poles of the circuit under test are unclear.
Correct use of multimeter
The circuit of the multimeter is more complicated than the wheel, and it is used frequently, and there are more chances of failure and damage.
Precautions for use and maintenance:
1. When measuring voltage, the meter should be connected in parallel with the circuit under test. If the measured voltage is DC, also pay attention to the positive and negative poles.
2. When measuring current, the meter should be connected in series with the circuit under test, and pay attention to the positive and negative poles.
3. If the positive and negative poles of the circuit under test are not clear, you can put the transfer switch on the highest range, and then switch to the appropriate range for measurement.
4. If you are not sure about the positive and negative poles of the circuit under test, you can put the transfer switch on the highest range, and then touch a calibration rod on any pole of the circuit under test, and then put the other one. The calibration handle is lightly touched on the other pole of the circuit under test and then removed immediately. Observe the deflection direction of the pointer, and then determine its positive and negative poles.
5. If it is not clear whether the voltage of the circuit under test is DC or AC, you should use the AC gear to test first, and then switch to the DC gear to test. When testing with the DC gear, if the meter does not read, it is AC, otherwise it is DC.
6. The current or resistance part of the meter must not be mis-measured for voltage, otherwise the meter head will suffer serious damage.
7. When adjusting the resistance, the power supply of the circuit under test must be cut off to avoid damage to the meter head. It is best to solder a wire end of the resistance to be measured from the original circuit before measuring. This can not only protect the meter head, but also ensure accurate measurement. If there is a capacitor in the circuit under test, the capacitor should be discharged first, otherwise the meter will be damaged.
8. After the measurement is completed, the special transfer switch should be set to the maximum range of AC voltage measurement, so as to avoid damage caused by accidental misuse in the next use.
