Products > Test Equipment
Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
core:
--- Quote from: ebastler on December 22, 2023, 10:48:28 am ---
--- Quote from: core on December 22, 2023, 06:28:49 am ---Can anyone check if they got the same result?
--- End quote ---
Is it possible to go back to older firmware versions, or did you just happen to have a saved screenshot which showed the old version info and its noise?
--- End quote ---
Now I am with old firmware and the noise is back at low level.
I will try some FFTs with 02.04 and then the same tests with 02.12.
I'll be back ;)
core:
I have measured several configurations.
I've installed 02.04 -> calibration -> measurements. Same for 02.12. Now there are lower values for DC offset.
I've set 1mV/div, 1ms/div, using 1Mpts/10Mpts deep memory.
From 10Mpts up there are no difference in measurements and FFT plots.
The noise levels for measurements without filters are identical.
For 02.04, the FFT level at 20 Mhz BW is about 12dB lower than the level for full BW.
For 02.12, the difference is about 8dB.
It seems that the filter for 20 Mhz has been changed.
I'll be back with some interesting captures regarding HiRes.
core:
I've forgot these ...
core:
It appears that the order in which the 20MHz and Hires filters are applied it matter. It can be seen on the attached FFT plots.
The HiRes filters are identical for both FW versions, I will attach them for 02.12 only.
If HiRes is applied first, then 20MHz, the effect is clear.
But if 20MHz is applied first and then HiRes, the latter has no effect on the FFT.
Below I have attached for all combinations:
- Just Hires14
- Hires14, then 20MHz
- 20MHz, then Hires14
Same for Hires16.
For Hires14, only low freq response is changing. For HiRes16 all the freq are going down. Interesting, for me at least :)
Later edit : even when the order is HiRes -> then 20MHz, then you change back HiRes to Normal, the effect persist like the HiRes is still active. So it may be a bug ...
egonotto:
Hello,
the noise values on my device change for no apparent reason.
Best regards
egonotto
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version