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| 12 bit Keysight... when? |
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| PELL:
I guess because they have the best 10-bit ADC converter on the market. The important thing about a scope resolution is the "Effect Number Of Bits" or "ENOB". Many 12bits scope only has around 6~8bits of ENOB (depending on bandwidth and sample rate), while Keysight can easily reach this number with their 10bit ADC. One of my main guesses they actually design a 12bit ADC, but only say "it is 10bit" when marketing. Surely one day they will reach 12bit, but I don't think they will announce before they polish enough. |
| David Hess:
I can think of a couple of reasons that they would not support 12 bits. HP/Agilent/Keysight seems to have held onto their old Megazoom ASICs for a long time. Do they support 12-bit acquisition records? Except for dynamic range, much of the advantage of a good 12 bit digitizer is lost unless the linearity and settling time of the analog signal conditioning can support it. That is a very tall order, and the only oscilloscopes that I have ever seen which did it are sampling oscilloscopes, but they cheat. It should be good for the noise level of FFTs, but check out the spurious free dynamic range. --- Quote from: CosteC on December 22, 2023, 05:58:48 pm ---Btw Keysight scopes have hi-res modes. Maybe it is enough for thier customers so far? --- End quote --- Does Megazoom work with hi-res mode? |
| BillyO:
--- Quote from: mikeselectricstuff on December 22, 2023, 10:58:09 pm ---HP/Agilent/Keysight --- End quote --- There FTFY, Agilent and Keysight have little more than unfortunate history in common with HP. HP was quite possibly the best company ever, whereas those other two are, well, not. |
| Someone:
--- Quote from: David Hess on December 23, 2023, 03:24:51 am ---HP/Agilent/Keysight seems to have held onto their old Megazoom ASICs for a long time. Do they support 12-bit acquisition records? --- Quote from: CosteC on December 22, 2023, 05:58:48 pm ---Btw Keysight scopes have hi-res modes. Maybe it is enough for thier customers so far? --- End quote --- Does Megazoom work with hi-res mode? --- End quote --- Yes and yes. |
| Martin72:
--- Quote from: PELL on December 23, 2023, 02:15:03 am ---I guess because they have the best 10-bit ADC converter on the market. The important thing about a scope resolution is the "Effect Number Of Bits" or "ENOB". Many 12bits scope only has around 6~8bits of ENOB (depending on bandwidth and sample rate), while Keysight can easily reach this number with their 10bit ADC. One of my main guesses they actually design a 12bit ADC, but only say "it is 10bit" when marketing. Surely one day they will reach 12bit, but I don't think they will announce before they polish enough. --- End quote --- The Keysight 10bit converter is not bad - or it is generally hardly "better"... Edit: Not in the picture: Siglent SDS7000 H12: 7.5bits (3Ghz), 7.3Bits (4Ghz) Siglent SDS2000X HD: 8.7bits/8.4bits(100/350Mhz) |
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