| Products > Test Equipment |
| HDO4204 vs. SDS2104X HD |
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| 2N3055:
--- Quote from: Fungus on February 26, 2023, 03:01:37 pm --- --- Quote from: switchabl on February 26, 2023, 02:55:02 pm ---I am not sure what you are trying to say? 100:1 is exactly the same as 40 dB, assuming that this refers to a voltage ratio. --- End quote --- Oh, duh! I'm thinking of power gain, not voltage gain. One of those days... 40dB power gain = 10000:1 40dB voltage gain = 100:1 The point stands though. It seems suspiciously low considering all the effort they put into the rest of the front end. --- End quote --- It has to designed to have better isolation. If they kept same front end design philosophy, they might have easily "inherited" same isolation figures. Fact is, isolation is frequency dependent. It can have peaks too.. It won't be at 40dB all the time. But it will at some points and some combination. This is worst case scenario. DHO4000 guarantees that it is no worse than 40 dB (100:1) at any point. SDS2000X HD won't be worse than 60 dB (1000:1) at any point, and no worse than 70dB (3100:1) anywhere below 350MHz. At 10 MHz both probably have CH2CH crosstalk buried in the noise floor... And as to why? Signal integrity is hard work. Simple as that. |
| voltsandjolts:
--- Quote from: 2N3055 on February 26, 2023, 04:14:16 pm ---And as to why? Signal integrity is hard work. Simple as that. --- End quote --- Heh, especially when your designing a high-res scope...nowhere to hide ;D |
| Fungus:
--- Quote from: 2N3055 on February 26, 2023, 04:14:16 pm ---DHO4000 guarantees that it is no worse than 40 dB (100:1) at any point. --- End quote --- And "any point" includes 800MHz. --- Quote from: 2N3055 on February 26, 2023, 04:14:16 pm ---At 10 MHz both probably have CH2CH crosstalk buried in the noise floor... --- End quote --- Yep. |
| switchabl:
--- Quote from: Fungus on February 26, 2023, 06:48:46 pm --- --- Quote from: 2N3055 on February 26, 2023, 04:14:16 pm ---DHO4000 guarantees that it is no worse than 40 dB (100:1) at any point. --- End quote --- And "any point" includes 800MHz. --- End quote --- 500 MHz apparently. >500 MHz they only claim 30:1 (~30 dB). |
| 2N3055:
--- Quote from: Fungus on February 26, 2023, 06:48:46 pm --- --- Quote from: 2N3055 on February 26, 2023, 04:14:16 pm ---DHO4000 guarantees that it is no worse than 40 dB (100:1) at any point. --- End quote --- And "any point" includes 800MHz. --- Quote from: 2N3055 on February 26, 2023, 04:14:16 pm ---At 10 MHz both probably have CH2CH crosstalk buried in the noise floor... --- End quote --- Yep. --- End quote --- To their detriment, specification is same even for 200 MHz version.... But they are not only ones that have this spec in this ballpark or worse: Tektronix 2 series MSO Channel to channel isolation 100:1 <= 100 MHz, 30:1 > 100 MHz Tektronix 3 series MDO Channel-to-channel isolation (typical) Any two channels at equal vertical scale ≥100:1 at ≤100 MHz and ≥30:1 at >100 MHz up to the rated bandwidth Tektronix 4 Series MSO Crosstalk (channel isolation),typical ≥ 200:1 (46dB) up to the rated bandwidth for any two channels having equal Volts/div settings (this is already expensive 12 bit design) Keysight MSOX3104T Channel-to-channel isolation > 100:1 from DC to maximum specified bandwidth of each model (measured with same V/div and coupling on channels) (granted, this is for 1 GHZ BW) R&S RTB2000 and RTM3000 : Channel-to-channel isolation (each channel at same input sensitivity) input frequency < analog bandwidth > 50 dB, so bit better. Siglent SDS6104H12 (Chinese version) has 60 dB up to 200 MHz, 50 dB up to 500 MHz, 40 dB up to 1 GHz. Basically, Rigol isolation is generally speaking not worse than average scope (even from expensive brands). It is only problematic because it is 12 bit design and could actually see crosstalk that 8 bit design might not.. Some scopes are much better, and only because they designed it specifically that way, i.e. isolation was included as a factor in design optimization. |
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