The hires mode or the averaging mode does not change the bit steps at all, and there is no difference when changing vertical after stopping either.
Hence the conclusion I can draw is that the Hires mode on the DS1000z is broken, or it never existed in the first place, and should thus be removed from Rigols advertisement and the specification for the instrument.
even 2k's "hires" mode is nothing usefull really, while on 1000z it doesn't even exist.
how to test it?
do you see any meaningful change when you turn it on? if not, then it doesn't exist.
but again, even on 2k this is just a gimmick....just like the perfectly still line on grounded input...that doesn't exist, why would you do it? for whom?
this thread should be called "rigol gimmicks/tricks".
edit/ok, it does something on 2k, not totally useless, looking at lastest pix from marmad.
This is just successive sample averaging producing more effective bits - the formula and method for doing it is well-documented. I'm not sure what you expect to happen when you press Hi Res - would the display grow more pixels? Even with a bigger ADC and higher resolution display, when you zoom in far enough, you see jagged edges.
well i would expect that in 21st century we've moved away from number of bits we first saw in 1972. for starters.
http://en.wikipedia.org/wiki/8-bit#Notable_8-bit_CPUs8bit adcs are even older
http://www.analog.com/library/analogdialogue/archives/39-06/chapter%201%20data%20converter%20history%20f.pdfpage 23 onwards.
offcourse more bits have their limits too (12bits requires 8k display, i didn't kid much..heh), but they do exponentially grow, as you know...1024 levels of 10bit would be good enough.
that is 5x more zoom. oh yeah, what is "ultra zoom" on rigol?
hehe...why do i even ask?
is it by any chance just the horizontal zoom?
did you ever hear anybody call "zoom" enlarging just one axis of the image?
meh....it's more advertising than technology....simillar to the way new flat tvs are marketed, with whole lots of interesting tech terms that in the end bring nothing or next to nothing.
there were 200hz panels, now 400hz....
btw. is anybody making 10bit adcs that output whole 1k resolution if not via its display then via pc interface?
but...hehm..now i know why these things are relatively cheap...
i'm familiar with these concepts from video processing....your pdf mentions both sample and capture averaging...i would call first spatial averaging, and latter temporal averaging....
i presume rigol2k has the former, and i know the latter would be more usefull to average the noise out...i'm also familiar with dithering of images...
but either way it's just a trick to make a waveform look a bit better in a similar way that adding noise to video makes lores video easier on the eyes, but that still has nothing to do with hires video... no extra data was introduced....you just played a bit with existing data to reduce noise....
and video nr filters are always a compromise, you lose some and gain some...it's same here...
talking about video again: i would prefer to not use noise reduction at all because when you do it poorly it's worse than not doing it at all...and you can't really do it properly.
and i see same goes for 'hires' concept in scopes: why don't they just call it noise reduction?
or "virtual resolution improvement"....or both....there really is no need to lie about it.....
it's not hires.the bottom point is that you can play with software on small amount of bits, OR do it properly and don't play at all and just improve adc ie employ 10bit adcs. map every level to every pixel, at least via pc interface...for scope's own display just do a bicubic resize of hires image...it'll be allright.
waaaaay better than 200 freakin vertical pixels/levels.
to that extent what's the price difference between 10 and 8bit adcs that we're discussing here?
btw. i don't thin it makes any sense to calculate effective number of bits the way you do it, to end up with, for example, "6.8 bits and 9.7 bits" numbers, because bits are bits, they don't have decimal point. because the whole thing is kinda like those "ghetto blaster" "boom boxes" which would state ridiculous 'pmpo' power outputs: it's just a gimick in attempt to sell something.
it's not really there and it won't
really help the measuring.
dave said it well:
https://www.eevblog.com/forum/blog/eevblog-683-rigol-ds1000z-ds2000-oscilloscope-jitter-problems/msg554787/?topicseen#msg554787although i don't agree that these days 8bit adc is all we should expect, even for such a low price!