I'm 34, so not so old, not so young. I've used many analog scopes as well as digital ones and I know very well the effects of aliasing. In fact, digital scopes usually do not incorporate an anti-aliasing filter because the type of filter appropriate to each application would vary and it is considered better to give the flexibility to the end user. Also, the filter cutoff would have to vary as you changed the sample rate. Sean On Thu, Sep 25, 2014 at 7:38 PM, V S wrote: > On Thu, Sep 25, 2014 at 12:19 AM, Sean Breheny wrote: > > > Have you ever used an analog storage scope? THOSE are weird! > > > > > > Are you so young? Then perhaps you don't know that weird stuff are > digital > scope and not analog one. You know why? because they work based on Nyquis= t > theory, while analog scope don't. > If the scope designer miss the correct low pass filter, you can see on a > digital scope everything you want except the real signal you have. This i= s > happening most often even with some 15.000$ scopes if you want to see > noise. Because noise is really random. Then if you are old enough you go = in > the basement and take a real analog scope, which yes is measuring correct > the noise from your system. > > best, > Vasile > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .