Steps and precautions for measuring voltage with a multimeter
How to measure voltage with multimeter
First, align the range switch within the five ranges marked V (when testing AC voltage, align it with the AC voltage range, and when testing DC voltage, align it with the DC voltage range).
Secondly, when measuring voltage, the meter pens should be connected in parallel to the circuit under test. Select an appropriate range position based on the approximate value of the circuit under test. The maximum value of each dry cell battery is 1.5V, so it can be placed in the 5V range. At this time, the full-scale reading of 500 on the panel should be read as 5. That is 100 times smaller. If the meter needle points to the 300 scale, it reads 3V. Note that the value indicated by the tip of the range switch is the corresponding value of the full-scale reading of the meter needle. When reading the meter, you only need to convert it accordingly to read the real value. Except for the resistance level, the measurement results are read in this way for all range switch levels.
Finally, in actual measurement, when the approximate value of the measured voltage cannot be determined, you can first turn the switch to the maximum range, and then reduce the range step by step to the appropriate position. When measuring DC voltage, pay attention to the positive and negative polarity. If the test leads are connected reversely, the meter needle will hit backwards. If you don't know the positive and negative polarity of the circuit, you can set the measuring range of the Wanta meter to the maximum range, quickly test it on the circuit under test, and see how the pen needle deflects to determine the positive and negative polarity.
Things to note when measuring voltage with a multimeter
1. Before using the multimeter, you should perform "mechanical zero adjustment", that is, make the multimeter pointer point at the zero voltage or zero current position when there is no electricity being measured.
2. When using the multimeter, do not touch the metal part of the test lead with your hands. This can ensure the accuracy of the measurement on the one hand and personal safety on the other hand.
3. When measuring a certain amount of electricity, do not change gears while measuring, especially when measuring high voltage or large current. Otherwise, the multimeter will be damaged. If you need to change gears, you should disconnect the test leads first, and then measure after changing gears.
4. When using the multimeter, it must be placed horizontally to avoid errors. At the same time, attention should also be paid to avoiding the influence of external magnetic fields on the multimeter.
5. After using the multimeter, the transfer switch should be placed in the maximum AC voltage range. If it is not used for a long time, the battery inside the multimeter should also be taken out to prevent the battery from corroding other components in the meter.
