Specific operating steps for voltage measurement with multimeter are as follows:
1. Replace the multimeter switch to the appropriate position to determine whether the voltage being measured is DC or AC, and then turn the switch to the corresponding voltage range (DC voltage range or AC voltage range). If the polarity of the voltage to be tested is unclear, it can be tested using the high DC voltage mode first. If the pointer moves, it indicates that it is a DC current; If the pointer does not move (indicating that the measured voltage may not move due to a large range or AC power), switch to the high AC voltage range and try again. If the pointer moves, it means it is AC power. If the pointer still does not move, switch to the lower DC voltage range for testing. If it moves, it means it is DC power. If it does not move, switch to the next AC voltage range.
2. Choose the appropriate range: Roughly estimate the magnitude of the measured DC voltage based on the voltage of the power supply in the circuit under test and select the range. If you are not sure about the voltage level, you should first use the high voltage range to test and measure, and then gradually switch to the low voltage range until you find the appropriate range.
The standard for the appropriate range of the voltage range is that the pointer should be placed at 2/3 or more of the full offset scale on the dial as much as possible (which is different from the standard for the appropriate magnification of the resistance range and should be noted).
3. Measurement method: When measuring voltage with a multimeter, the multimeter should be connected in parallel with the circuit being tested. Connect the red probe of the multimeter to the high potential terminal of the circuit under test, where the DC current flows into the circuit terminal, and connect the black probe to the low potential terminal of the circuit under test, where the DC current flows out of the circuit terminal. For example, when measuring the voltage of a dry battery, we connect the red meter rod to the positive terminal of the dry battery and the black meter rod to the negative terminal of the dry battery.
4. Correct reading:
(1) Find the voltage scale reading: Carefully observe the dial, the DC voltage level scale line should be the scale line in the dial. There is a V symbol below the scale line on the dial, indicating that the scale line can be used to read AC/DC voltage and current.
