6 Ремонт Методы Цифровой Мультиметр
Цифровой инструменты иметь высокий чувствительность и точность, и их приложения are found in almost all enterprises. Однако, due to the fact that there are many factors in the failure, and the randomness of the problems encountered is large, there are not many rules to follow, and the repair is difficult. Here, I have sorted out some repair experience accumulated in many years of work practice for the reference of Коллеги Вовлеченный В Это Профессия.
When looking for faults, you should start from the outside and then the inside, first easy and then difficult, break the whole into parts, and make breakthroughs in key points. The methods can be roughly divided into the follow categories:
1. The sensory method непосредственно судьи the cause of the fault by means of the senses. Через визуальный осмотр, it can be found such as disconnection, desvaporing, short circuit, broken fuse tube, burnt components, механический повреждение, and copper фольга деформация on the printed схема. Вы можете касание температура подъем из батареи, резисторы, транзисторы, и интегрированные блоки, и вы можете ссылаться к схема диаграмма к найти вне the reason for the ненормальная температура повышение. В дополнение, by hand, you can also check have the components are loose, whether the integrated circuit pins are firmly inserted, and whether the transfer switch is stuck; you can hear and laugh whether there являются ненормальные звуки и запахи.
2. Напряжение измерение метод
3. Короткое замыкание замыкание метод
In the method of checking the A/D converter упомянутый above, the короткое замыкание метод is generally used, and this method is often used when repairing weak and micro-electric instruments.
4. Цепь разрыв метод
Disconnect the suspicious part from the whole machine or unit circuit. If the fault disappears, it means that the fault is in the disconnected circuit. This method is mainly suitable for the situation where there is a short circuit in the circuit.
5. Измерение элемент метод
When the fault has been narrowed down to one or a few components, it can be measured online or offline. If necessary, replace it with a good one. If the fault disappears, the component is broken.
6. Interference method
Use the human body induced voltage as the interference signal to observe the changes of the liquid crystal display. It is often used to check whether the input circuit and the display part are intact.
