How to check the Hall sensor of electric vehicle with a multimeter
Resistance detection
The most direct method to detect resistance is to use a multimeter to measure the resistance range. Generally, the resistance value is marked on the resistance, and the appropriate resistance range is selected. Connect the red and black probes at both ends. If the reading is close, it is normal. Otherwise, it is broken. When measuring high resistance, be careful not to touch the red and black probes with both hands. It is not dangerous to touch them, but to ensure the accuracy of measuring resistance. It is possible to touch one of the probes with your hand.
Potentiometer detection
Normally, a potentiometer has three pins. First, use a multimeter to select the resistance range and measure whether the resistance between two of the three pins of the potentiometer is at or close to the resistance value marked on the potentiometer. If there is a significant difference, it indicates that the potentiometer is damaged. If the multimeter is normal, continue to measure these two pins, and then rotate the potentiometer counterclockwise to a position close to the off position. At this point, the smaller the resistance value, the better. Then rotate it clockwise again. If the resistance gradually increases, rotate until the resistance value is close to the marked resistance value, and the potentiometer is normal.
Fixed capacitor detection
In addition to using a multimeter to select the appropriate range for measuring capacitance, you can also use a resistance range to measure capacitance. When measuring, choose the appropriate resistance range and connect two probes to the two pins of the capacitor. The resistance value should be infinite. If the resistance value is 0, the capacitor is damaged.
Electrolytic capacitor testing
The measurement methods for electrolytic capacitors and fixed capacitors are slightly different. Of course, you can choose to use the capacitance range for detection, which everyone knows. Let's talk about the method of measuring with the resistance range. First, choose the appropriate resistance range. The red and black probes touch the two poles of the capacitor respectively. At this point, the displayed value will increase from 0 until the overflow symbol 1 is displayed. If 0 is always displayed, it means that there is an internal short circuit in the capacitor. If 1 is always displayed, it means that there is an open circuit between the capacitor poles. It is also possible that choosing the resistance range is not appropriate. Here, it is important to note that during measurement, due to the positive and negative poles of electrolytic capacitors, do not connect them in reverse. Usually, connect the red probe to the anode of the capacitor (the one with the longer foot). Connect the black probe to the cathode of the capacitor (the one with the shorter pin), and the pointer of the multimeter is exactly the opposite.
Inductance detection
Similarly, select the resistance range of the multimeter and connect the probe to both ends of the inductor. If the measured resistance value is zero, there will be an internal short circuit in the inductor. Under normal circumstances, the DC resistance of the tested inductor is directly related to the diameter of the enameled wire used to wrap the inductor coil and the number of turns. As long as the resistance value can be measured, the inductor can be considered normal.
Diode detection
Set the multimeter to the detection diode position, connect the red probe to the anode of the diode and the black probe to the cathode of the diode. If the voltage drop of the diode is displayed on the display screen (usually 0.5 for silicon tube and 0.2 for germanium tube), it indicates that the diode is normal. Swap the probe. If the display screen shows 1, it is normal. Otherwise, it is broken down. If both test results are 0 or 1, it indicates that the diode is damaged.
