Digital storage oscilloscope functions, bandwidth and usage

　　Digital Storage Oscilloscope (DSO) first converts the input analog signal into a digital signal through A/D and stores it in the memory RAM; when it needs to be displayed, it reads the data in the RAM, restores it to analog quantity through D/A, and displays it on the screen. Its signal processing and display functions are independent.

　　DSO is easy to use and can observe the signal before triggering. When using X-Y method to observe the waveform, there is almost no phase difference between the two channels, and the accuracy is high. At present, DSO basically uses flat panel displays such as LCD monitors, which display stable graphics without flickering and are convenient for observation.

　　Digital storage oscilloscope function

　　The random access memory (RAM) of a digital storage oscilloscope can be divided into four types according to its function: signal data memory, reference waveform memory, measurement data memory, and display buffer memory. The signal data memory stores analog signal sampling data; the reference waveform memory stores reference waveform data; the measurement data memory stores intermediate data and calculation results of measurement and calculation; and the display buffer memory stores data to be displayed.

　　Digital storage oscilloscope bandwidth

　　Bandwidth is one of the important indicators of an oscilloscope. It has the same definition as the amplifier bandwidth, i.e. the so-called -3dB point. When a sine wave signal is input to the input end of the oscilloscope, the frequency point where the amplitude is attenuated to 0.707 times the original signal amplitude is called the oscilloscope bandwidth. In other words, if the bandwidth of an oscilloscope is 100MHz, when it is used to test a signal with a frequency of 100MHz and an amplitude of 1Vpp, the final measured signal amplitude is only 100MHz and 0.707Vpp.