Do I need an oscilloscope to learn electronics?

Oscilloscopes are the eyes of electronic engineers and maintenance personnel. Without observation instruments such as oscilloscope and spectrum analyzer, it is tough to judge the working state of the circuit. Is this answer clear enough? The oscilloscope is also a watershed in the practical ability and theoretical foundation level of EE-related personnel.

Do I need an oscilloscope to learn electronics
Do I need an oscilloscope to learn electronics?

The oscilloscope and the multimeter

During the re-examination of the postgraduate students, many tutors took the test on the working principle and the testing principle of the oscilloscope. It is a pity that all the top students cannot answer. Do not cry anymore; the oscilloscope cannot cost one or two thousand yuan, and the virtual oscilloscope with 50M bandwidth and 200Ms sampling of 500 yuan is sufficient for most of the measurement work required in the study. It is a drop in the bucket compared to your study and living expenses. For most students who are unfamiliar with the operation, can you give them an oscilloscope with a bandwidth of more than 1G? I see that most of the study work uses a student oscilloscope of 50M or more, which similar teaching and research rooms and laboratories do not have an oscilloscope with hundreds of thousands. Are those in the comment area attractive to those of us who have been in charge of procurement work, showing price, bandwidth, sampling, and showing Windows interface? The oscilloscope can often observe the clock signal to check whether the crystal oscillator is usually working and whether the amplifier’s magnification is insufficient. Whether saturated or clipped, the phase difference between the input and output signals and the SPI and I2C signals can also observe. My first oscilloscope was a scrapped Hitachi V1050F (dual-trace 100M) that I received in junior high school. In the absence of a maintenance manual, only a multimeter, and the calibration square wave with the oscilloscope, I repaired its two Y. The channel and power supply cost an ignorant junior high school student a lot of time and energy. In high school, it also went off a few times, but I pulled back from the line of life and death.

The advantage of oscilloscope

Some people say that the older man’s multimeter is the best in the world. However, that era was very different from now. Repairing a semiconductor radio and a multimeter can determine the operating point and current and distinguish whether the device is good or bad. It can indeed do most of the work. Earlier, some people did not use a multimeter to fix a tube radio with a screwdriver to start a fire and judge the tube’s temperature. The current electronic equipment is far beyond what a black-and-white TV and radio can match in terms of system complexity and operating frequency.
Moreover, even if it is to repair the mechanical tuner of a black and white TV, everyone will be eager to have an oscilloscope. In the case of insufficient resources, it is a must-have skill for radio maintenance personnel in that difficult period to be competent for maintenance work with the least amount of equipment. However, at present, many undergraduate and graduate students in EE and other majors can use an oscilloscope probe to click and take a look. You have to copy and paste it into the five groups to ask questions to solve the problem. Don’t you think that this kind of person has problems, whether intelligence or other knowledge levels?
One week is enough for the training program of the Department of Electronics. “The oscilloscope is not simply a voltage-time measuring instrument with accuracy. An oscilloscope is a powerful tool for time-domain analysis on many occasions. It recommends that you use the oscilloscope[1] for circuit debugging and fault analysis. , do not limit the use of the oscilloscope to simply observing the port-to-port signals in the signal flow.
The oscilloscope can use for debugging and measurement of RF circuits. The standard method is to directly select the input impedance of 50 ohms on the interface. Usually, the oscilloscope has two input impedances of 50 ohms and one megohm to choose from. However, this method cannot use for direct measurement. For high-power RF signals, an attenuator should properly connect in series.

Future higher-tech applications of oscilloscopes

On the ancient oscilloscope Tek 2465B, the left side of the DC indicator above the Y channel is the 50-ohm input impedance indicator, which will only light up when it switches to 50-ohm input. In the design and debugging of RF circuits, everyone pays attention to port S-parameters noise and intermodulation indicators most of the time. However, only analyzing in the frequency domain, it is not easy to judge the time domain shape of the signal (especially the pulse signal). The oscilloscope can extract and parametrically measure the envelope of the RF pulse signal, which is very common in radar pulse envelope testing. Earlier, when measuring radar signals, a detector was connected in series at the input end. Now many oscilloscopes are capable of directly measuring pulse signals such as radar.

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