What is the difference between a digital oscilloscope and an analog oscilloscope?
Analog oscilloscopes use analog circuits (oscilloscope tubes, which are based on electron guns). The electron gun emits electrons toward the screen. The emitted electrons are focused to form an electron beam and hit the screen. The inner surface of the screen is coated with a phosphor that emits light where the electron beam hits it.
Digital oscilloscopes are high-performance oscilloscopes manufactured by a series of technologies such as data acquisition, A/D conversion, and software programming. Digital oscilloscopes generally support multi-level menus and can provide users with multiple choices and analysis functions. There are also some oscilloscopes that can provide storage to save and process waveforms.
Digital oscilloscopes use digital display methods, and their working principles are based on digital. Generally, the continuous signal is sampled (discretized) first. Then filter.
Analog oscilloscopes directly process continuous signals using analog circuits and then display them. The entire process is based on analog circuits.
An oscilloscope is a very versatile electronic measuring instrument. It can transform invisible electrical signals into visible images, making it easier for people to study the changing processes of various electrical phenomena. The oscilloscope can be used to observe the waveform curves of various signal amplitudes changing with time. It can also be used to test various electrical quantities, such as voltage, current, frequency, phase difference, amplitude modulation, etc.
Oscilloscopes can be divided into analog oscilloscopes and digital oscilloscopes.
Analog oscilloscope:
Analog oscilloscopes work by measuring the signal voltage directly and plotting the voltage in a vertical direction by a beam of electrons passing across the oscilloscope screen from left to right.
Digital oscilloscope:
The way a digital oscilloscope works is to convert the measured voltage into digital information through an analog converter (ADC). The digital oscilloscope captures a series of samples of the waveform and stores the samples until the storage limit is determined to determine whether the accumulated samples can depict the waveform. Then, the digital oscilloscope reconstructs the waveform.
Digital oscilloscopes can be divided into digital storage oscilloscopes (DSO), digital phosphor oscilloscopes (DPO) and sampling oscilloscopes.
To increase the bandwidth of analog oscilloscopes, oscilloscope tubes, vertical amplification and horizontal scanning need to be fully promoted. To improve the bandwidth of a digital oscilloscope, you only need to improve the performance of the front-end A/D converter, and there are no special requirements for the oscilloscope tube and scanning circuit. Plus digital oscilloscopes can make full use of memory, storage and processing, as well as multiple triggering and advance triggering capabilities. In the 1980s, digital oscilloscopes suddenly emerged and achieved numerous results. They have the potential to completely replace analog oscilloscopes. Analog oscilloscopes have indeed retreated from the front desk to the background.
