The steps to measure the positive and negative poles of an electric vehicle battery using a multimeter are as follows:
1. Preparation stage: Ensure that the electric vehicle is turned off and all power connections have been disconnected to ensure safety. Choose a suitable multimeter to ensure that its DC voltage range can meet the measurement range of electric vehicle battery voltage. Set the selection knob or switch of the multimeter to DC voltage mode.
2. Connection measurement: Connect the red test probe of the multimeter to the positive terminal of the electric vehicle battery. In most cases, the positive electrode will have a "+" symbol or color marker. Connect the black test probe of the multimeter to the negative terminal of the electric vehicle battery. The negative electrode usually has a "-" symbol or color mark. Pay attention to the tight contact between the probe and the battery pole to ensure measurement accuracy.
3. Reading result: Observe the voltage value displayed on the multimeter. If the multimeter is connected correctly and the battery is in good condition, it should display a positive voltage. Determine the battery status based on the voltage value. For example, if the voltage is close to or equal to the rated voltage of the battery, the battery may be in normal working condition; If the voltage is significantly lower than the rated voltage, it may be necessary to charge or replace the battery. If the multimeter displays negative voltage or cannot read properly during the measurement process, check if the probe connections are correct, if the battery has discharged to an extremely low level, or if there is a malfunction with the multimeter.
The above steps are based on general guidance, and specific operations may vary depending on the type of electric vehicle battery and the model of the multimeter. During the measurement process, please be sure to follow the safety operating procedures to ensure personal and equipment safety.