The principle and use of digital oscilloscope

Digital oscilloscopes are indispensable tools for designing, manufacturing, and repairing electronic equipment. With the rapid development of technology and market demand, engineers need the best tools to quickly and accurately solve the measurement challenges they face. As the eyes of engineers, digital oscilloscopes are essential in meeting today's tough measurement challenges.

Digital oscilloscopes are becoming more and more popular due to their unique advantages in waveform triggering, storage, display, measurement, waveform data analysis and processing. Since there is a large performance difference between digital oscilloscopes and analog oscilloscopes, if they are used improperly, large measurement errors will occur, thus affecting the test task.

Principle of Digital Oscilloscope

A digital oscilloscope is a high-performance oscilloscope manufactured by a series of technologies such as data acquisition, A/D conversion, and software programming. The working mode of a digital oscilloscope is to convert the measured voltage into digital information through an analog converter (ADC). A digital oscilloscope captures a series of sample values ​​of a waveform and stores the sample values. The storage limit is to determine whether the accumulated sample values ​​can depict the waveform. Subsequently, the digital oscilloscope reconstructs the waveform. Digital oscilloscopes can be divided into digital storage oscilloscopes (DSO), digital phosphor oscilloscopes (DPO) and sampling oscilloscopes.

Oscilloscope usage steps

Display and measure DC signals (steps)

Generate 10V DC voltage from the DC regulated power supply, turn on the power, and press any key to exit the self-test screen.

Add a signal line to the input terminal ch1 of the oscilloscope and connect it to the DC regulated power supply. (The ground wire of the input terminal ch1 of the oscilloscope is connected to the ground wire of the DC regulated power supply)

Press the AUTO button

Press the UTILITY button and select the language as Chinese (Simplified)

Press the ACQUIRE button, select the acquisition method as average value, and the average number of times is 128

Press the ch1 menu, select grounding as the coupling mode, adjust the position knob to adjust the ground wire to the appropriate position, adjust the volts/division to 5.00V/division (clearly marked), probe 1& TI mes;, and invert off.

Then select DC as the coupling mode, and the line on the screen will jump up 2 grids. (The ground wire needs to be clearly marked)

Display and measure AC signals (procedures) 

Turn on the power and press any key to exit the self-test screen.

Add a signal line to the oscilloscope's input terminal ch1. (The ground line of the oscilloscope's input terminal ch1 is connected to the signal ground line)

Press the Auto Set button, press the ch1 menu, select AC for coupling mode, adjust volts/div to 2.00V/div (clearly marked), probe 1&TImes;, invert off.

Press the TRIGGER menu, select ch1 as the signal source and adjust the trigger level to stabilize the waveform.

Press the MEASURE button to measure the frequency, period, peak-to-peak value, etc. of the signal. Select ch1 as the source and adjust the type to period, frequency, peak-to-peak value, etc.

Press the CURSOR button to use the cursor to measure the voltage and period of the signal. Select voltage, move the position knob, place cursor 1 at the top of the waveform, cursor 2 at the bottom of the waveform, circle the increment number, then change the type to time, move the position knob, place cursor 1 at the left end of the waveform, cursor 2 at the right end of the waveform, circle the increment number.