• Categories:Industry news
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• Time of issue:2023-08-16 14:23
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(Summary description)1. Stitch removal method When the reading of the automobile electrical instrument is abnormal, through analysis and inference, it may be that there is a tie fault in the wire inside the sensor or between the sensor and the indicator instrument, and the stitch removal method is often used for inspection. That is, by removing the wires on the relevant terminal posts, the cause and location of the fault are judged. Taking the electromagnetic fuel gauge as an example, when the internal iron or float of the sensor is damaged, and the wire between the sensor and the fuel gauge is ironed, no matter how much oil is in the fuel tank, after the ignition switch is turned on, the fuel gauge pointer always points to "0", and the wire removal method can be used to check. First, remove the wire on the sensor, if the fuel gauge pointer moves towards "I" at this time, the internal iron or float of the sensor is damaged; If the pointer still points to "0", remove the sensor terminal post wire on the fuel gauge, and if the meter pointer moves towards "I", tie the wire between the fuel gauge and the sensor; If the pointer is still not moving, it may be damage to the inside of the fuel gauge or an open circuit in its power cord. 2. Iron method When the reading of the automobile electrical instrument is abnormal, through analysis, it is inferred that the sensor iron may be poor or damaged, and the wire between the sensor and the indicator instrument has a circuit breaking fault, the iron tie method is often used for inspection. By connecting the relevant terminal posts with wires, the cause and location of the fault can be determined. After the ignition switch is turned on, the fuel gauge pointer points to "I" for the electromagnetic fuel gauge regardless of the amount of oil stored in the tank; For bimetal fuel gauges, the fuel gauge pointer points to "0", which indicates that the corresponding instrument sensor may have a bad iron, damage, or a broken wire between the sensor and the indicator instrument, at this time, the iron method can be used to check. First of all, connect the sensor to the terminal post with the wire, if the pointer turns, it means that the sensor is damaged or the tie is poor; If the pointer does not rotate, the wire can be used to tie the wire post of the indicator instrument to the sensor, if the pointer rotates, the wire between the sensor and the indicator instrument has an open circuit fault; If the pointer still does not turn, it indicates that the meter is internally damaged or its power cord is open. 3. Short connection method 在其它电器仪表工作均正常、只有与稳压器相连的仪表（如燃油表、电磁式 水温表等）不工作时，可利用短接法进行检查。用导线将稳压器的输入、输出端 短接，这时与稳压器相连的仪表指针若立即偏转，则为稳压器内部存在故障。