Summary of the key points of using the multimeter
This is the fourth part about the use of the multimeter. When measuring the current, it is necessary to connect the multimeter in series with the circuit under test. The re-measurement method can eliminate the measurement error caused by the internal resistance of the current range. Measure resistance, etc.
Summary of the use points of the multimeter 4
The main points of using the multimeter
1. Connect the multimeter in series with the circuit under test when measuring the current.
2. When measuring the current, if the internal resistance of the power supply and the load resistance are very small, a larger current range should be selected as much as possible to reduce the internal resistance of the current range and reduce the influence on the working state of the circuit under test.
3. The re-measurement method can eliminate the measurement error caused by the internal resistance of the current gear.
Re-measurement method: Select two adjacent current files of the same multimeter, connect them to the circuit under test respectively to measure the two data, and then substitute the formula to calculate the exact value of the current under test.
4. It is strictly forbidden to measure the resistance when the circuit under test is live, and it is also not allowed to check the internal resistance of the battery with an electric block. Because this is equivalent to connecting an external voltage, the measurement is inaccurate, and the multimeter is easily damaged, even endangering personal safety.
