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Show us your square wave

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Electro Fan:

--- Quote from: T3sl4co1l on September 01, 2020, 06:47:03 am ---Not having seen the settings, acquisition and all that -- it could easily just be a glitch, with sinc interpolation making it look believable.  (The suspiciously small number of points seems to hint at that?)

I can do the same thing, to literally unbelievable risetimes, on my TDS460 -- this being relatively easy as it uses equivalent time sampling.  (Heh, though I don't know how I'd trick it to acquire a nice step; it's random sampling I believe, it just assembles a waveform bit by bit.)

Heh, and at maximum settings (1ns/div sweep, 50x zoom), it can show all the way down to 20ps/div.  Not that anything it can properly acquire is at all meaningful there (it's only 350MHz BW).

Tim

--- End quote ---

With all due respect, I don't believe we were looking at a "glitch".  It was just a mis-read/misinterpretation of the the cursor readout values.


Edit:  added some photos... original at 700 Pts (what the Rigol chose on Auto) and same waveform from same pulse gen showing same cursor display values at 1.4 MPts, 14 Mpts, and 56 Mpts.  The whole discussion of why Mechatrommer's 1054Z seemed so blindingly fast was because I got us off track when I saw numbers like 700 ps and 500 ps*; it was just me looking at the displayed values (values that at first I thought were Rise Times but I'm now pretty sure are just the deltas to the trigger line).  So these values weren't intended to be interpreted as Rise Time values, that was just my error.  It certainly wasn't anything Mechatrommer did or misinterpreted; he just posted his results.  His posts were A-OK/perfecto and I think his 1054Z is A-OK/normal, ie, very fast for a 1054Z but not fundamentally different than other 1054Zs we've seen.

*I can't help it, I get excited when I see anything with picoseconds  :P

Mechatrommer:

--- Quote from: Electro Fan on September 01, 2020, 05:29:23 am ---if my numbers add up and yours are correct, I think you might have the fastest 1054Z known to mankind. :)

--- End quote ---
i think mine is just normal like everybody else rigloled to 100MHz, i suggest someone try the setting, 500mV/div, sinc(always on cant turned off of course), peak acq.. reducing to 200mV/div signal will be distorted similar to your shown 2072 signal.. i smelled ifft effect since there's slightly gibbs phenomenon visible on my signal, i was just enjoying the squareness of it without giving much thought on RT figure. I did check with my erasynth micro last night after you brought this up, the -3db signal bw of my 1054z is just about 270MHz... so no magic there.. i forgot ds1054z has a risetime meas built in, i'll try that later if i remember, now in office and lack of sleep.

Electro Fan:

--- Quote from: Mechatrommer on September 01, 2020, 07:46:42 am ---
--- Quote from: Electro Fan on September 01, 2020, 07:19:13 am ---
--- Quote from: T3sl4co1l on September 01, 2020, 06:47:03 am ---Not having seen the settings, acquisition and all that -- it could easily just be a glitch, with sinc interpolation making it look believable.  (The suspiciously small number of points seems to hint at that?)

I can do the same thing, to literally unbelievable risetimes, on my TDS460 -- this being relatively easy as it uses equivalent time sampling.  (Heh, though I don't know how I'd trick it to acquire a nice step; it's random sampling I believe, it just assembles a waveform bit by bit.)

Heh, and at maximum settings (1ns/div sweep, 50x zoom), it can show all the way down to 20ps/div.  Not that anything it can properly acquire is at all meaningful there (it's only 350MHz BW).

Tim

--- End quote ---

With all due respect, I don't believe we were looking at a "glitch".  It was just a mis-read/misinterpretation by me/EF of the the cursor readout values.
edited to clarify it was my error


--- End quote ---
i was using manual cursor and calculation to get 10 and 90% level, and criss cross intersect the vertical cursors to get risetime. As said i forgot there is built in risetime math i'll try that later...

--- End quote ---

- just to confirm, this was my (Electro Fan's) error caused by my mis-read on the values displayed, it was not a mis-read or any error by Mechatrommer

Electro Fan:
While it's good to learn from the misses, when shooting free throws it's good to end on a made free throw.  So just to show we know a rise time when we see a rise time, here is one that's pretty close to 30 ps.

Fungus:

--- Quote from: Mechatrommer on September 01, 2020, 07:36:17 am ---
--- Quote from: Electro Fan on September 01, 2020, 05:29:23 am ---if my numbers add up and yours are correct, I think you might have the fastest 1054Z known to mankind. :)

--- End quote ---
i think mine is just normal like everybody else rigloled to 100MHz

--- End quote ---

Turbo Tom did it and got the image below. Original post here

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