Many industries require the use of instruments, which play a crucial role in many environments. Long term use of instruments may cause various problems. Therefore, engineers from Dongguan Xinhang Instrument Co., Ltd. have compiled some commonly used troubleshooting methods for instruments for reference by colleagues and users.

Several maintenance methods for instruments and meters are as follows:

1. Short circuit troubleshooting:

For faults such as interference and self-excitation, a certain two points in the circuit can be temporarily short circuited. If the fault disappears after a short circuit, it indicates that the fault is located before the short circuit point, otherwise it is located after the short circuit point. If the DC potential between the two points to be short circuited is different, it should be short circuited through a capacitor of appropriate capacity.

2. Knocking and pressing to eliminate interference

It is common to encounter the phenomenon of instruments running on and off, which is mostly caused by poor contact or virtual soldering. For this situation, tapping and hand pressing methods can be used.

3. Comparative exclusion

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

4. Testing instrument inspection and elimination

Using specialized testing instruments to test the entire machine or components of an instrument can usually effectively troubleshoot and improve repair quality.

5. Cut off exclusion

Cut off suspected circuits from the entire machine or unit circuit, gradually narrowing the scope of fault diagnosis. For example, when the working current is too high or there is a short circuit fault, a part of the circuit can be disconnected from the entire machine, and the change in current can be observed to determine whether the part of the circuit is in a normal state.

6. Observation and exclusion

Utilize visual, olfactory, and tactile senses. Sometimes, damaged components may discolor, blister, or show burnt spots; Burnt devices may produce some special odors; Short circuited chips will heat up; Virtual or detached solder joints can also be observed with the naked eye.