John Payson wrote: > I sorta wish people could make digital scopes that did a better job > of emulating analog ones. For example, I'd like to see a scope > that could (assuming moderate resolution, e.g., 10uS/div), store > all of the following values for each pixel: > > [1] The minimum and maximum values observed during that time period, > as sampled. > [2] The minimum and maximum values observed during that time period, > if run through a moderately low-pass filter (e.g. if each pixel > is 500ns, I'd like the filter's "effective" RC time constant to > be about 100ns. if the minima and maxima are logged every 10ns. > [3] The average value observed during that time period, > Gaussian-weighted into the preceding and following ones. John: My Tek 2230 comes pretty close to this... It does #1 just as you describe, and you can fake #2 by using the "compress display by a factor of four" option. It doesn't really do #3, although it does have a "smooth" option that does something similar. The best thing about the 2230, though, is that it can be switched from digital storage to a true (non-digitized) analog mode... So when you get tired of being lied to, you can flip the switch and see what the signal's REALLY doing. To be fair, though, the 2230's digital mode rarely lies to me... Its aliasing problems are nowhere near as bad as what I've seen in my more-or-less limited experience with the Tek TDS220 and the HP 54645D. -Andy === Andrew Warren - fastfwd@ix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499