Advantages and Disadvantages of Digital Oscilloscopes Working Principle of Digital Oscilloscopes
A digital oscilloscope is an instrument used to display changes in the trajectory of the measured instantaneous value. It is an oscilloscope with a data recording function. It generally supports multi-level menus and can provide users with multiple choices and multiple analysis functions. There are also some oscilloscopes that can provide storage to save and process waveforms.
Advantages and Disadvantages of Digital Oscilloscopes
advantage:
1. Low frequency signals can be observed without flicker.
2. The signal can be saved for a long time.
3. With advanced trigger function.
4. High measurement accuracy.
5. Have strong processing capabilities.
6. With digital signal input/output function.
Disadvantages: Digital oscilloscopes also have their limitations. For example, due to the influence of factors such as the maximum conversion rate of the A/D converter, digital oscilloscopes cannot be used to observe higher frequency signals.
How digital oscilloscopes work
The digital oscilloscope first samples the analog signal at high speed to obtain the corresponding digital data and stores it. Use digital signal processing technology to perform relevant processing and calculations on the sampled digital signals to obtain the various signal parameters required (including the electrical parameters of some components that may need to be tested with a multimeter). The signal waveform is drawn based on the obtained signal parameters, and real-time and transient analysis of the measured signal can be performed to facilitate users to understand the signal quality and diagnose faults quickly and accurately.
When the measurement starts, the operator can select the measurement type (waveform measurement, component measurement), measurement parameters (frequency/period, effective value, resistor resistance, diode on-off, etc.) and measurement range (optional automatic setting) through the Chinese interface. The instrument automatically sets the optimal range); the microprocessor automatically interprets the measurement settings to the sampling circuit and starts data collection; after the collection is completed, the microprocessor processes the sampling data according to the measurement settings and extracts the required measurement parameters. And send 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, modify the measurement settings and resample according to the specific situation. After several such "sampling-analysis-adjustment-resampling" cycles, the oscilloscope can complete the touch-and-measure function without the need to manually change the range, making it easy to operate by hand.
