How to Measure Current with a Multimeter: Methods and Steps
A multimeter is a commonly used electrical instrument that can measure electrical parameters such as current, voltage, and resistance. Among these, measuring current is one of the most common tasks in electrical work. When using a multimeter to measure current, it is essential to master the correct methods and procedures to ensure accuracy and safety.
There are two main methods for measuring current with a multimeter: the series method and the parallel method. The series method involves connecting the multimeter's current measurement terminals in series with the circuit under test, allowing the current to flow through the multimeter for measurement. The parallel method, on the other hand, involves connecting the multimeter's current measurement terminals in parallel with the circuit, enabling a portion of the current to flow through the multimeter for measurement.
For the series method, the circuit connection involves linking the multimeter's common terminal and current measurement terminal together, then connecting the current measurement terminal to the series path of the circuit under test. The specific steps are as follows:
Before measuring current with a multimeter, first adjust the current measurement range to an appropriate level to ensure the accuracy of the measurement results. If the current value is relatively small, select a smaller measurement range.
Disconnect the circuit under test and turn off the power supply in the circuit.
Connect the positive and negative power leads of the multimeter to both ends of the circuit under test respectively.
Select the appropriate current measurement range and ensure the multimeter's selection knob is set to the current measurement position.
Turn on the power supply of the circuit under test to allow current to flow through it.
Observe the numerical value displayed on the multimeter to obtain the current measurement result. If multiple measurements are required, record the value of each measurement and calculate the average to improve accuracy.
