How to Use an Automotive Multimeter?
2 Answers
Usage method of an automotive multimeter: 1. Rotate the selector switch of the automotive multimeter to the DC voltage position. At this point, the multimeter enters the automatic range selection mode, which can automatically select the best measurement range. Alternatively, you can press the range button to switch to manual range selection mode; 2. Insert the lead of the red probe into the voltage jack on the panel, and the lead of the black probe into the COM jack on the panel; 3. Ensure that the positive and negative probes of the multimeter match the positive and negative polarities of the circuit test points; 4. Read the measured DC voltage value. The multimeter is one of the commonly used instruments for testing electronic circuits, with its main advantages being portability, ease of use, and the ability to measure multiple parameters effectively.
As someone who frequently works on car repairs, when using an automotive multimeter, the first step is to ensure the car is turned off and the negative battery terminal is disconnected—safety first. Next, select the correct measurement range: use the DC voltage (DCV) setting to measure voltage, such as checking battery health (normal reading should be around 12.6V); use the Ohms setting for resistance or continuity tests to locate open circuits or short circuits. Don’t forget to connect the test leads properly: red lead to the positive test point and black lead to the ground wire or chassis. When taking readings, wait for the display value to stabilize before recording—no rush. Measuring current requires extra caution, as it must be done in series with the circuit. Beginners are advised to start with voltage testing, as it’s safer and easier to handle. With a bit of practice, you’ll get the hang of it. A multimeter helps quickly diagnose electrical issues, preventing minor problems from escalating and saving repair costs—far better than guessing blindly!
