Products > Test Equipment
12 bit Keysight... when?
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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