Nyquist allows for capturing the highest frequency component, but not the fidelity of the waveform shape. Think of the waveform with 4 or 10 sampling dots along it and you can get an idea of what you can actually see.
Peter
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On Apr 18, 2019, at 3:04 PM, Keith Monahan via Groups.Io <keith@...> wrote:
16700A and 16900A owner here.
You'll probably get a better answer from others here, but I'll take a swing:
Nyquist says 2x the signal frequency absolute minimum.
My 200mhz Keysight scope samples at 2ghz.
Rule of thumb that I've used for years is 4x-10x to be sure. More is usually better. An exception that comes to mind on my scope is that limiting bandwidth on low-frequency signals (like audio spectrum) is really helpful for eliminating high-frequency noise.
Keysight says 8x-10x for "today's(2017) complex signals." See below for a discussion.
Each module may have its own series of limitations, like which bits are active (0-3 in your case?), and the sample rate of 128k bytes. Check your user reference manual to be sure.
At the higher frequencies, I'd be fairly concerned about probing and how you're going about getting access on your target to those signals. I'm not familiar with that module's specific probing options, but there's associated restrictions that you should research.
Hope that helps,
Keith
On 4/18/2019 2:19 PM, Ethan Waldo wrote:
Does anyone familiar with the 16500 analyzer know what the practical maximum digital signal speed the 16517a can capture is, timing analysis half channel? I'm not clear if 1-4Ghz speeds are digital speeds or just analog.
Sent from my Samsung Galaxy smartphone.
