The difference between multimeter and oscilloscope in measuring circuit parameters
Due to work needs, I have used both multimeters and oscilloscopes when soldering circuit boards and debugging circuits. To be honest, I feel that I use multimeters more often than oscilloscopes when I work normally, unless the problems that cannot be solved by multimeters are used. Use an oscilloscope to solve it. I usually have two multimeters on hand, one is analog pointer and the other is digital.
pointer multimeter
The analog pointer multimeter is still very powerful in some special occasions. For example, I often use the pointer multimeter to judge whether the unmarked triode is PNP or NPN. It is very convenient for the triode to be in conduction; you can also use a pointer multimeter to judge the polarity of the three polarities of the drain (D), source (S) and gate (G) of the MOS tube and its quality.
digital multimeter
Digital multimeters are known for their high precision, convenient reading of measured values, and strong overload capability. I often use digital multimeters when measuring voltage, current, and resistance on circuit boards. Since the digital multimeter has a hold function when measuring voltage and current, it is very convenient for measurement readings. Therefore, they are often used in combination according to their respective "strengths" when repairing and debugging the circuit board.
The main role of the oscilloscope
I just talked about the work that the multimeter can undertake, and now we are talking about the oscilloscope. Let's take an inappropriate example. The multimeter is equivalent to the stethoscope that doctors often carry when they go out to see a doctor. It is easy to carry but has limited functions. It can only measure limited functions such as voltage, current, resistance, and triode type; Advanced CT machines are powerful and can check any part of the human body, but they are expensive. Then the oscilloscopes used by us electronic repair technicians are similar to this instrument. As far as the types of oscilloscopes are concerned, there are generally two types, one is analog oscilloscopes and the other is digital oscilloscopes. Their common feature is that they can not only measure the voltage and current of the circuit, but also measure the waveform, phase, period and frequency of the voltage or current, and many other parameters of the circuit board. From this aspect, the "skill" of the oscilloscope is more powerful.
Especially in digital circuits, when it is necessary to capture "transient" short-lived signals, then the oscilloscope is a right-hand man at this time, and its "capture" time can reach milliseconds, and the "capture" frequency can reach hundreds of megahertz.
