Methods and steps for current and voltage measurement with a multimeter
A digital multimeter, also known as a multimeter, multimeter, multimeter, or multimeter, is a multi-purpose electronic measuring instrument that generally includes functions such as an ammeter, voltmeter, ohmmeter, etc. Compared with pointer multimeters, digital multimeters are widely used due to their high accuracy, fast speed, large input impedance, digital display, accurate readings, strong anti-interference ability, and high degree of measurement automation. But if used improperly, it can easily cause malfunctions. Let the editor of Electrician's Home introduce the methods and steps of using a multimeter to measure current and voltage one by one.
1. Before using a multimeter, it is necessary to perform a "mechanical zeroing", which means that when there is no measured power, the multimeter pointer should be placed at the zero voltage or zero current position.
2. During the use of a multimeter, do not touch the metal part of the probe with your hands. This ensures accurate measurement and personal safety.
3. When measuring a certain amount of electricity, it is not advisable to shift gears at the same time, especially when measuring high voltage or high current. Otherwise, it will damage the multimeter. If you need to shift gears, disconnect the probe first and then measure after shifting gears.
Steps to measure current and voltage using a multimeter
1. Select the range. The DC voltage range of the multimeter is marked with "V" and has five ranges: 2.5 volts, 10 volts, 50 volts, 250 volts, and 500 volts. Select the range based on the voltage of the power supply in the circuit. Due to the fact that the power supply voltage in the circuit is only 3 volts, the 10 volt range is selected. If the voltage level is unclear, the highest voltage range should be used for measurement first, and gradually switch to the lower voltage range.
2. Measurement method. The multimeter should be connected in parallel with the tested circuit. The red pen should be connected to the positive terminal of the tested circuit and the power supply, and the black pen should be connected to the negative terminal of the tested circuit and the power supply.
3. Read correctly. Carefully observe the dial, the DC voltage level scale line is the second scale line. When using the 10V level, the measured voltage value can be directly read out using the third row of numbers under the scale line. Pay attention to the reading, and your line of sight should be facing the pointer.
