Hello all,
I'm trying to get minimal knowledge around oscilloscopes so I understand the technical spec and I can buy an oscilloscope with features good enough for personnal use.
Recently I tried to get information about bandwidth and sampling rate (for digital scopes of course), and found this video made by Keysight :
The key elements I understood from this video :
- The given bandwidth is the frequency at which with have a signal loss ratio of 3 db (~70% is the signal passes through);
- The best practice to have a good measurement would be to use a scope / probe combo with a bandwidth at least 3 times higher than the main frequencey of the signal I want to probe;
- The scope AND the probe bandwidth have a global influence, if both of them have a bandwidth of X the actual bandwidth would be less;
- For non sinusoidal signals (like clock pulses), the rising edge timing shall be used to compute the main frequency
The info I got there is for a single source however, so I would like to read your thoughts about that, especially if you are a professional with great experience in using oscilloscopes, so I can have a better idea if the video says right and if I got the info correctly.
(As for the rest, I guess that sample rate is the frequency at which the signal is sampled by the digital oscilloscope, and "kdots" or "Mdots" value is the number of samples the tool can store in memory)
Thanks for sharing your knowledge with me !
I'm trying to get minimal knowledge around oscilloscopes so I understand the technical spec and I can buy an oscilloscope with features good enough for personnal use.
Recently I tried to get information about bandwidth and sampling rate (for digital scopes of course), and found this video made by Keysight :
- The given bandwidth is the frequency at which with have a signal loss ratio of 3 db (~70% is the signal passes through);
- The best practice to have a good measurement would be to use a scope / probe combo with a bandwidth at least 3 times higher than the main frequencey of the signal I want to probe;
- The scope AND the probe bandwidth have a global influence, if both of them have a bandwidth of X the actual bandwidth would be less;
- For non sinusoidal signals (like clock pulses), the rising edge timing shall be used to compute the main frequency
The info I got there is for a single source however, so I would like to read your thoughts about that, especially if you are a professional with great experience in using oscilloscopes, so I can have a better idea if the video says right and if I got the info correctly.
(As for the rest, I guess that sample rate is the frequency at which the signal is sampled by the digital oscilloscope, and "kdots" or "Mdots" value is the number of samples the tool can store in memory)
Thanks for sharing your knowledge with me !