Products > Test Equipment
Rigol DHO800 memory depth / bandwidth upgrades and noise level!
Fungus:
--- Quote from: ebastler on November 06, 2023, 03:27:59 pm ---Anybody here with access to a tunable sine wave generator which goes up to 200 MHz to measure the bandwidth in the frequency domain? And ideally an even higher bandwidth scope to check the generator output amplitude? 8)
--- End quote ---
Yes, and 0.45 works!
https://www.eevblog.com/forum/testgear/hacking-the-rigol-dho800900-scope/msg5132343/#msg5132343
ebastler:
--- Quote from: Fungus on November 06, 2023, 05:17:01 pm ---
--- Quote from: ebastler on November 06, 2023, 03:27:59 pm ---Anybody here with access to a tunable sine wave generator which goes up to 200 MHz to measure the bandwidth in the frequency domain? And ideally an even higher bandwidth scope to check the generator output amplitude? 8)
--- End quote ---
Yes, and 0.45 works!
https://www.eevblog.com/forum/testgear/hacking-the-rigol-dho800900-scope/msg5132343/#msg5132343
--- End quote ---
Thanks! That is good news indeed -- and on the other hand a call to paying some attention to aliasing.
I just notice that you had already mentioned Martin's measurements a few posts earlier. I had overlooked the further text below the pictures there, sorry.
Fungus:
--- Quote from: TomKatt on November 06, 2023, 04:29:44 pm ---I'm a bit surprised the shared DAC and 312smps at 4 channels isn't more of a concern.
--- End quote ---
It is what it is. Just be careful and switch off a channel or two if there's any doubt.
You're also free to leave it at Rigol's "70Mhz" if you want to - 128Mhz is still a decent bandwidth and the 'scope is still a bargain for $399.
nb. You can switch between 70Mhz/100Mhz options in under a minute. The longest part is waiting for it to reboot.
voltsandjolts:
Perhaps leaving the bandwidth at 70MHz (128MHz actual, apparently) reduces scope noise, compared to 100MHz (200MHz actual, apparently)? I haven't seen anyone posting measurements of ENOB before/after upgrade.
Fungus:
--- Quote from: voltsandjolts on November 06, 2023, 05:42:25 pm ---Perhaps leaving the bandwidth at 70MHz (128MHz actual, apparently) reduces scope noise, compared to 100MHz (200MHz actual, apparently)? I haven't seen anyone posting measurements of ENOB before/after upgrade.
--- End quote ---
Leaving it at "70Mhz" is a very sensible option if you often work with four high speed signals or simply want the best possible signal fidelity.
I can easily measure noise before/after. Hang on...
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