folk...@vanheusden.com said: > the scope software says 2MHz but output is really 10MHz).
That's one of the joys of digital scopes. You are seeing the interaction of the sampling rate and the signal frequency. The chart on the right says the sampling rate is 12 MS/s Try it with a sampling rate of 100 or 200 MS/s There are 2 ideas tangled in here. The first is Nyquist. If your signal has a bandwidth of X and you sample at more than 2X, then you can reconstruct the signal perfectly. The second idea is aliasing. We normally think of the "bandwidth of X" as being from 0 to X. But it also works if that bandwidth is centered on some high frequency. The signal gets aliased down to baseband. You can reconstruct the correct signal if you know the offset which will be some integer multiple of your sampling rate. DSP geeks do this all the time. You can probably work out a few examples with pencil and paper. Try a signal rate of 1 and a sampling rate of slightly less than 1/10. Does anybody have a good URL that explains this? -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.