DUOYI DY18 automotive electrical circuit tester can perform polarity testing. The device has a built-in reverse polarity protection feature that prevents it from being damaged in case of reverse polarity connections.
To perform polarity testing with the DY18, first, you need to ensure that the device is properly connected to the vehicle's electrical system. The device comes with a set of test leads that can be used to connect to the vehicle's battery, fuse box, or any other electrical components. Once the device is connected, you can turn it on by pressing the power button.
To perform polarity testing, you need to touch the probe tip of the test lead to the positive (+) or negative (-) terminal of the electrical component you are testing. The device will display the voltage and polarity of the component on the LCD screen. If the polarity is correct, the device will display a positive (+) sign for the positive terminal and a negative (-) sign for the negative terminal. If the polarity is reversed, the device will display a negative (-) sign for the positive terminal and a positive (+) sign for the negative terminal.
Polarity testing is an important function for automotive electrical testing, as it helps identify and correct reversed polarity connections that can cause damage to the vehicle's electrical system. With its built-in reverse polarity protection feature and accurate polarity testing function, the DUOYI DY18 is a reliable and efficient tool for testing and diagnosing automotive electrical issues.