Which model is better for using a multimeter for circuit board maintenance
To truly engage in maintenance, it is still necessary to use a pointer meter because the response of a digital meter is slow, and a considerable amount of data cannot be measured using a digital meter. The quality of an analog table (i.e. a pointer table) is measured by internal resistance, and the smaller the internal resistance, the better and more expensive it is. The best one to use is MF10, which can be searched on Taobao. In addition, MF47 may seem to have similar indicators as MF10, but its implementation is achieved through circuits, which are not on the same order of magnitude as MF10.
The field transistors of the CPU power supply section on the motherboard are all in parallel. If one is broken down, then measuring the others on the board is broken down. It cannot be checked one by one without removing them... Also, if the North Bridge is broken, some chip resistors and capacitors connected in parallel with the North Bridge will be short circuited. That is to say, if a chip is broken, the components connected in parallel with it will be short circuited. However, it is not because these components are broken, but because the chip is damaged, the parallel components will also be short circuited. In fact, the parallel components are not short circuited, but because the chip is damaged, the grounding of the parallel components will lower the resistance value of the components.
What is an oscilloscope used for repairing computers and measuring circuits with a multimeter?
1. An oscilloscope is used to detect the AC voltage waveform of relevant points. Including amplitude, frequency, type, such as sawtooth wave, rectangular wave, sine wave
2. For example, detecting whether the oscillation circuit is operating normally
3. For example, detecting the line frequency and field frequency circuits of a picture tube display. Is the sawtooth wave normal
Electronic circuit maintenance can only be done with a multimeter
For the past, most electronic circuit repairs relied on experience. For experienced repairmen, simple electrical repairs could be done with just a multimeter
However, in today's miniaturization and integration of electronic circuits, using a single tool is increasingly unable to meet the needs of repairing complex and precise electronic products. For example, radio frequency faults, logic faults, or occasional fault phenomena.. At this point, it is not only necessary to have rich experience, but also to use advanced instruments such as spectrum analyzer, oscilloscope, logic analyzer, etc. to help identify and solve problems.
In summary, it can be said that junior maintenance personnel can only use a multimeter, and if they want to go further, they must learn to use advanced tools.
