Introduction to the functions and principles of oscilloscopes

　　The oscilloscope is also called a handheld oscilloscope, which is easy to carry and easy to operate. It can transform invisible electrical signals into visible images, making it easier for people to study the changing process of various electrical phenomena. What is the function of the oscilloscope? The principle of the oscilloscope is introduced as follows.

　　Oscilloscope

　　The oscilloscope, also known as a handheld oscilloscope, is easy to carry and easy to operate. It can transform invisible electrical signals into visible images, making it easier for people to study the changing process of various electrical phenomena. The oscilloscope can be used to observe the waveform curves of various signal amplitudes changing over time, and it can also be used to test various electrical quantities, such as voltage, current, frequency, phase difference, amplitude modulation, etc.

　　Features

　　The handheld digital oscilloscope integrates the functions of digital storage oscilloscope, digital multimeter and digital frequency meter. It is battery powered and has a graphic LCD display. It is a new type of practical instrument in the field of electronic measurement. This design uses embedded design technology to embed core components such as microcontroller , A/D converter, LCD controller into the system, and uses embedded operating system , AS IC design technology, LCD graphic display technology and digital signal processing technology to design an embedded instrument system. The instrument is fully functional, small in size and light in weight. It is very convenient to carry and operate. It has extremely high technical content, strong practicality and huge market potential, and represents a development trend of contemporary electronic measuring instruments.

　　Principle Analysis

　　How an analog oscilloscope works

　　Traditional analog oscilloscopes add the two electrical signals to be observed to the X and Y channels of the oscilloscope to control the offset of the electron beam, thereby obtaining a waveform display on the screen about the relationship between the two electrical signals. Obviously, this type of analog oscilloscope is large in size, heavy in weight, high in cost, and expensive, and is not very suitable for measuring non-periodic, single-shot signals.

　　Working Principle of Digital Oscilloscope

　　Modern digital storage oscilloscopes first sample analog signals at high speed to obtain corresponding digital data and store them. Digital signal processing technology is used to perform relevant processing and operations on the sampled digital signals to obtain the required various signal parameters (including some electrical parameters of components that may need to be tested using a multimeter). The signal waveform is drawn based on the obtained signal parameters, and the measured signal can be analyzed in real time and transiently, so that users can understand the signal quality and diagnose faults quickly and accurately.

　　At the beginning of the measurement, the operator can select the measurement type (waveform measurement, component measurement), measurement parameters (frequency/period, effective value, resistance value, diode on/off, etc.) and measurement range (optional automatic setting, the instrument automatically sets the optimal range) through the Chinese interface; the microprocessor automatically interprets the measurement settings to the sampling circuit and starts data acquisition; after the acquisition is completed, the microprocessor processes the sampled data according to the measurement settings, extracts the required measurement parameters, and sends the results to the display component. If necessary, the user can choose the automatic test mode: after analyzing the data obtained from the first sampling, the microprocessor will adjust and modify the measurement settings according to the specific situation and resample. After several such "sampling-analysis-adjustment-resample" cycles, the oscilloscope can complete the touch-and-measure function without manually changing the range, which is convenient for handheld operation. Obviously, digital storage oscilloscopes have many outstanding advantages over traditional analog oscilloscopes:

　　The test conditions can be automatically determined and adjusted according to the characteristics of the signal being tested, truly realizing automatic, hands-free testing.

　　It is easy to realize real-time capture of high-speed, transient signals.

　　·It has obvious advantages in waveform storage and calculation.

　　Performance

　　It integrates the functions of digital storage oscilloscope, multimeter and frequency meter in one; handheld; AC/DC power supply.

　　Analog bandwidth 10MHz; single bandwidth 5MHz; sampling rate 50MS/s.

　　Record length 2KB; single channel.

　　Horizontal scan: 50ns/div~10s/div; vertical scan: 5mV/div~5V/div.

　　Measure signal parameters: period, frequency, duty cycle, average, effective, peak-to-peak value.

　　Measuring resistance: 100, 1K, 10K, 100K, 1M.

　　Measuring voltage: 10mV, 30mV, 1V, 3V, 10V, 30V.

　　Diode measurement, continuity measurement.

　　Frequency meter: 10MHz±5%.

　　Measurement accuracy: oscilloscope accuracy ±5%, multimeter accuracy ±3%.

　　Calibration signal: 1KHz/0.3V.

　　LCD: 320×240 dots, 92mm×72mm, adjustable contrast, with backlight.

　　Others: Battery powered ≥ 2 hours, RS2.

　　Application

　　1. Electricity and energy;

　　2. Aerospace;

　　3. Automotive electronics ;

　　4. Circuit design ;

　　5. Colleges and universities.