Digital Oscilloscope Working Principle
A digital oscilloscope is an instrument that is used to display changes in the instantaneous value traces of a measurement, and it is an oscilloscope with a data logging function. It generally supports multi-level menus, which can provide the user with a variety of choices and a variety of analysis functions. There are also some oscilloscopes that can provide storage, enabling the saving and processing of waveforms.
Digital oscilloscopes first sample the analogue signal at high speed to obtain the corresponding digital data and store it. With digital signal processing technology on the sampling of digital signals for the relevant processing and arithmetic, so as to obtain the required signal parameters (including the use of multimeters may be required to test the electrical parameters of some components). According to the signal parameters obtained to draw the signal waveform, and can be measured signal real-time, transient analysis, in order to facilitate the user to understand the signal quality, fast and accurate diagnosis of faults.
At the beginning of measurement, the operator can select the measurement type (waveform measurement, component measurement), measurement parameters (frequency/period, RMS value, resistor resistance, diode on/off, etc.) and the measurement range (optional automatic setting, the best range is automatically set by the instrument) through the Chinese interface; the microprocessor automatically interprets the measurement settings to the sampling circuit and starts the data acquisition; after the completion of the acquisition, the microprocessor processes the sampled data according to the measurement settings and extracts the data that have been sampled. 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: the microprocessor will adjust and modify the measurement settings according to the specific situation after analysing the data obtained from the first sampling and re-sampling. After several such "sampling-analysis-adjustment-re-sampling" cycles, the oscilloscope can complete the function of instantaneous measurement, without the need to manually change the range, which is convenient for hand-held operation.
