How to choose a digital fluorescent oscilloscope is reasonable?

1, bandwidth
In order to accurately measure the relationship between bandwidth selection and the maximum frequency of the signal to be measured, let's first look at the following example: for example, there is a 50MHz pulse signal:
From the above different bandwidth of the oscilloscope measurement figure, in order to ensure the accuracy of the test signal amplitude and rising delay, choose the bandwidth of the oscilloscope should be 3-5 times of the signal frequency measured, accurate measurement should be 8-10 times or more.
2. Sample collection
Sinusoidal wave: more than 5 sampling points/periods (general requirements), the more sampling points, the closer to the actual waveform.
Pulse wave: rising edge greater than 5 sampling points:
Precise measurement of rising edge is greater than 10 sampling points.
3. Storage length: Storage length = sample book * scanning speed * 10, or waveform observation time, formula.
4. Trigger function: to ensure that the measured signal can be captured and synchronized. In order to observe and analyze the measured waveform. There are three trigger modes: automatic trigger, normal trigger and single trigger.