I am planning to buy Rigol MSO5204 scope with a bandwidth of 200 MHz. I need to measure the timing difference between 2 (or more) signals of up to +/- 7 ns. Since this scope has 8 GS/s sampling rate, I figured it will suffice my needs. Also, a cheaper model in the line Rigol MSO5074 offers the same features but, with a bandwidth of 70 MHz only. My signal frequencies are less than 10 MHz. The decrease in the bandwidth will increase the Rise time (from 1.75 ns to 5 ns) of the scope. My questions are:
- From experience, can anyone tell if 7 ns timing difference between signals can be captured if the rise time of the scope is 5 ns vs 1.75 ns?
- Is it worth spending extra money for a better rise time?
- I will be using a differential probe and most of the differential probes that I came across are 25-50 MHz bandwidth range. Could adding a differential probe with BW of 25 MHz affect the above timing measurements given that the signal frequencies are going to be less than 10 MHz?