EDIT3:
The problematic calibration is lfcal.hex. Just replacing that file gives perfectly shaped squares again.
Hi All,
had anyone tried the "Color Grade" mode - setting is found in the display menu.
Just saw the scope on the fair in Nuremberg - and the Color Grad mode was buggy as well - just displayed a gray colored line if switch on the colr grad- just works only once :-)
Thanks for testing!
This might be easy enough to check; is the record length halved when high resolution mode is used? What about in average mode?
Told them(rigol eu).
EDIT3:
The problematic calibration is lfcal.hex. Just replacing that file gives perfectly shaped squares again.
mabl, would it be possible for you to upload, or send to me, your working lfcal.hex?
I will check later to be sure, but I suspect that auto-cal does nothing... I have the overshoots on 3 channels and nothing changes when I use auto-cal. I even did it while I had input signals fed to all channels - the result didn’t change, everything looked as before, and I suppose that in that scenario the ‘scope should have lost calibration.
Interesting objection, test it out on monday - Scope is on work.
Although I did tests under various mem depth conditions already, but I´ll test it under auto again.
Nevertheless, I want the hi-res option selectable by 0.5 bits steps, as the lecroy and siglent models got.
This basically is the same as input signal filtering but with a variable cut-off frequency. I'd prefer the cut-off frequency to be constant over memory depth and samplerate. Do keep in mind that the signal will need a certain amount of noise for hires to actually work and not show fantasy signals. Hires isn't a replacement for having more bits from the ADC.
There is almost always plenty of noise even after the vertical attenuation stages. The only exceptions I have seen are in some old DSOs which used flash converters where the combined ADC and vertical signal chain noise was less than 1 LSB; on these if you adjust the position/offset just right, you can get a straight line with no or very few LSB transitions which might make you think the DSO is broken. Feed these DSOs with a clean triangle wave and average to 16 bits and you get a nice picture of the ADC's differential non-linearity as a stair-step.
This might be easy enough to check; is the record length halved when high resolution mode is used? What about in average mode?
So fun story, ...
This might be easy enough to check; is the record length halved when high resolution mode is used? What about in average mode?
Here we go,
Normal Mode
The so called Hires Mode
No changes in sample rate and record length.
Average Mode
Here´s a reaction, the samplerate decrease from 8 to 4GS/s and record lenght from 100 to 25Mpts - Once, independend from the number of averages.
I did the same thing with a Lecroy WS3024,
Samplerate and record length decreases dramatically, from 2 GS/s to 2 MS/s and from 10Mpts to 1kpt
Although, in hi-res mode samplerate and record lenght remains :
Many modern DSOs have very low noise ADCs which produce almost a flat line especially with the 20MHz bandwidth on.
QuoteThis might be easy enough to check; is the record length halved when high resolution mode is used? What about in average mode?
That doesn't have to be true. Hi-res can also be done as a post-processing step when the signal is displayed. For example: on the R&S RTM3004 the memory depth doesn't half when hi-res is selected.
All hi-res modes I've seen have a cut-off frequency depending on the samplerate which implies hi-res is always done after decimation.
That makes sense if the digitizer always produces 8 bit samples after decimation which seems to be common at least for Rigol.
QuoteThat makes sense if the digitizer always produces 8 bit samples after decimation which seems to be common at least for Rigol.When you see in hi-res nothing "cleaner" as in normal, what make the hi-res mode any sense at all...
Even the low cost siglent (the pictures I posted) could do this.
If rigol couldn´t handle this for what reasons ever, they should leave it.
And not disclaim a hi-res mode which doesen´t have any remarkable effect.
QuoteThat makes sense if the digitizer always produces 8 bit samples after decimation which seems to be common at least for Rigol.
When you see in hi-res nothing "cleaner" as in normal, what make the hi-res mode any sense at all...
Even the low cost siglent (the pictures I posted) could do this.
If rigol couldn´t handle this for what reasons ever, they should leave it.
And not disclaim a hi-res mode which doesen´t have any remarkable effect.
QuoteThat makes sense if the digitizer always produces 8 bit samples after decimation which seems to be common at least for Rigol.When you see in hi-res nothing "cleaner" as in normal, what make the hi-res mode any sense at all...
Even the low cost siglent (the pictures I posted) could do this.
If rigol couldn´t handle this for what reasons ever, they should leave it.
And not disclaim a hi-res mode which doesen´t have any remarkable effect.Well, Rigol wouldn't be the first manufacturer from China to leave features out which are in the datasheet. Hi-res probably hasn't been implemented yet.
However it is necessary to manually select the sample memory size to obtain the result that you want.
As rsjsouza mentioned, Rigol have successfully implemented Hi-Res mode in the DS4000 series. ( and also the DS2000 series).
So possibly they have now forgotten how to do it, or they have some new inexperienced software developers.
Perhaps not on the DS5000, but on the DS4000 it is there. Proof that it may be simply a matter of time for Rigol to add this.
As rsjsouza mentioned, Rigol have successfully implemented Hi-Res mode in the DS4000 series. ( and also the DS2000 series).
So possibly they have now forgotten how to do it, or they have some new inexperienced software developers.
Here my wishlist for further firmware upgrades ( will be send to rigol too):
- A useable hi-res mode, like keysight, lecroy and even siglent have it
- All math functions could be displayed "stand alone" and/or:
- Split screen modes, for every channel, for every math function - This would be a real benefit - None provide it in this priceclass an wide above. ( so it will be a wish I guess)
- Free choosable colours for all traces - Math got one colour only, unfortunately "dark violet", what makes no sense in aspect to the dark screen.
- A free adjustable measure gate, "free" moveable on the screen ( you define a gate and could this one scroll to the whole screen- it measures only whats in the gate, known from older lecroy waverunner scopes)
- Bode plot function, makes really sense when you already got a build in wavegenerator (will come)
- Brighter Display (will come)