Products > Test Equipment
Rigol DHO800 memory depth / bandwidth upgrades and noise level!
Fungus:
--- Quote from: ebastler on November 06, 2023, 07:33:40 pm ---How do the results change if you change the timebase?
--- End quote ---
I did it at 1us/div. because that's what Dave always does it at. :-//
--- Quote from: ebastler on November 06, 2023, 07:33:40 pm ---Also, doesn't the vertical amplification go up to 500 µV/div -- does that change the result?
--- End quote ---
I was told that 1mV and 500uV were just software expansions of the 2mV range. I can't find it in the dtasheets though. I'm sure 2N3055 will fill us in on the details.
2N3055:
--- Quote from: Fungus on November 06, 2023, 08:34:11 pm ---
--- Quote from: ebastler on November 06, 2023, 07:33:40 pm ---How do the results change if you change the timebase?
--- End quote ---
I did it at 1us/div. because that's what Dave always does it at. :-//
--- Quote from: ebastler on November 06, 2023, 07:33:40 pm ---Also, doesn't the vertical amplification go up to 500 µV/div -- does that change the result?
--- End quote ---
I was told that 1mV and 500uV were just software expansions of the 2mV range. I can't find it in the dtasheets though. I'm sure 2N3055 will fill us in on the details.
--- End quote ---
See my post above. Copied from the datasheet. I'm too lazy to retype that much. :-DD
[4]: 500 μV/div is a magnification of 1 mV/div setting. For vertical accuracy calculations, use full scale of 8 mV.
Fungus:
--- Quote from: 2N3055 on November 06, 2023, 08:19:27 pm ---[4]: 500 μV/div is a magnification of 1 mV/div setting. For vertical accuracy calculations, use full scale of 8 mV.
--- End quote ---
Ok, it was the bottom two scales on the DHO900, only the bottom scale on the DHO800.
I found it at the bottom of the datasheet:
2N3055:
--- Quote from: Fungus on November 06, 2023, 08:34:11 pm ---
--- Quote from: ebastler on November 06, 2023, 07:33:40 pm ---How do the results change if you change the timebase?
--- End quote ---
I did it at 1us/div. because that's what Dave always does it at. :-//
--- Quote from: ebastler on November 06, 2023, 07:33:40 pm ---Also, doesn't the vertical amplification go up to 500 µV/div -- does that change the result?
--- End quote ---
I was told that 1mV and 500uV were just software expansions of the 2mV range. I can't find it in the dtasheets though. I'm sure 2N3055 will fill us in on the details.
--- End quote ---
It was not meant to offend you.
I just pointed out the facts. Even 1ms/div is kind of short really.. I would suggest doing it on longer timebases too. Just to see how much low frequency noise is there.
As I said before, much as I like Dave, he makes mistakes too and is not always doing lots of preparations before doing videos.
ebastler:
Ok, so 1 mV/div is the highest "real" amplification. I think the DSO900 has an additional magnified step at the bottom end, 200 uV/div.
If we assume that the scope does its noise calculations from the acquisition buffer (as opposed to the screen data like the DS1054Z), then using the magnified settings should neither improve nor falsify the results.
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