The maintenance of instrumentation is an indispensable part of the electronic market. Only with good testing technology can instrumentation companies allow those unqualified products to enter the market after being tested and repaired. They must have good technical staff for instrumentation. The foundation of electronic professional knowledge also requires rich field experience. Here are a few simple judgment methods to introduce to you.

1. Percussion hand pressure method

The phenomenon of good and bad when the instrument is running is often encountered. Most of this phenomenon is caused by poor contact or weak welding. For this situation, percussion and hand pressure can be used.

The so-called knocking is to gently knock the plug-in board or component with a small rubber buckle or other knocking objects to see if it will cause an error or shutdown failure. The so-called hand pressing means that when a fault occurs, the components, plugs and sockets that are inserted after the power is turned off are pressed firmly by hand, and then the power is turned on to try whether the fault will be eliminated. If you find that it is normal to tap the case, and then it is not normal, first re-plug all the connectors firmly and try again. If it is troublesome and unsuccessful, you have to find another way.

2. Observation method

Use sight, smell and touch. Sometimes, damaged components will change color, blisters or burn spots; burnt components will produce some special odor; short-circuited chips will be hot; virtual soldering or desoldering can also be observed with the naked eye .

3. Elimination

The so-called elimination method is to determine the cause of the fault by plugging in some plug-in boards and components in the machine. When a plug-in board or device is removed and the instrument returns to normal, it means that the fault has occurred there.

4. Replacement method

Two instruments of the same model or sufficient spare parts are required. Replace a good spare part with the same component on the faulty machine to see if the fault is eliminated.

5. Contrast method

Two instruments of the same model are required, and one instrument is operating normally. To use this method, you must have the necessary equipment, such as a multimeter, an oscilloscope, etc. According to the nature of comparison, there are voltage comparison, waveform comparison, static impedance comparison, output result comparison, current comparison, etc.