Products > Test Equipment
Rigol DHO800 memory depth / bandwidth upgrades and noise level!
TomKatt:
I'm a bit surprised the shared DAC and 312smps at 4 channels isn't more of a concern.
Serg65536:
--- 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's NOT a DAC, but ADC!
And you are right: 250 Msampl/s, as other brands have at a slightly higher prices is much better! And don't forget about noise and quantization step: it's also much higher in competition. So yee.. it's not a good scope... :-DD :popcorn:
TomKatt:
Yes ADC - duh. The DST time shift always puts me off.
And I didn't mean to infer the lack of dual ADC's made it unusable, only that sampling rate seems to be an otherwise high priority spec.
2N3055:
--- Quote from: Serg65536 on November 06, 2023, 04:53:17 pm ---
--- 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's NOT a DAC, but ADC!
And you are right: 250 Msampl/s, as other brands have at a slightly higher prices is much better! And don't forget about noise and quantization step: it's also much higher in competition. So yee.. it's not a good scope... :-DD :popcorn:
--- End quote ---
It is not an absolute value competition, but Sample rate / BW combination.
If you have 130 MHz -3db BW and 312.5 MS/s then it is fine.
If you have 200 MHZ BW and 312 MS/s you are undersampling.
What other scope are you refering to specifically?
ebastler:
The ADC sample rate has been discussed at some length -- I don't recall in which of the various DHO800/900 threads.
The unusual thing with those scopes is that it is not the ADC which limits the acquisition rate, but apparently the FPGA or the FPGA/DRAM interface. The same ADC runs at 2 GSa/s in the DHO1000, but only 1.25 GSa/s in the 800/900. And when one activates the digital channels in the DHO900, the ADC even falls back to 625 MSa/s in total -- shared across 1 to 4 channels depending on the setup. The latter fact is unfortunately not disclosed in Rigol's datasheet.
So yes, there are tradeoffs which one needs to be aware of. And the advertised 250 MHz bandwidth in the DHO924 is pushing things a bit far for my taste. But overall, it's still a very nice package, even with the logic anaylzer enabled. Compare the acquisition rates with a Saleae Logic Pro 16, for example. (And compare the price tag too.)
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