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Let’s Talk About LeCroy Scopes, AKA… the “Wuerstchenhund Holds Court” Thread
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2N3055:
One thing I can see is that ESR (enhanced sample rate) is on.

One thing to note is that cutoff frequencies are consistent with 2.5 GS/s and 10 GS/s respectively (1.25 and 5GHz theoretical BW before ERES).
Which might mean that ERes in a channel is made from data before ESR, and in math after ESR (naturally).

I would disable ESR and try if then it is the same.

20 MHz BW limit should be physical, analog filter in channel input.
BW shown are for ERes alone, based on (Nyquist x 0,016) for 3 bit ... Or at least it should be like that..  :-\
Maybe scope "saw" use of BW20 limiter and "decided" to use 4x decimated data to save on filter taps..
But I doubt.
I would try disabling ESR first and try again.
Martin72:

--- Quote from: 2N3055 on August 04, 2022, 09:32:46 am ---ERes is quite well documented actually... See attachment..
--- End quote ---

Seems the HDO6000A do have some more feature in it´s software- although it´s basically the same ( before buying the 6000 we got a 4000 on loan).
Because in the manual of the HDO6000/Waverunner 9000 there is the same part about Eres function like you attached in your post.
And one additional more, the possibility to choose Eres in the channelbox, see my pic below (It´s just this one sentence).
By the way, turning the channel to full bandwith changes nothing on the bandwith when Eres is +3bit on the channelmenu.
HighVoltage:
I have always looked at LeCroy scopes as a niche market filler.

Over the years I only owed two LeCroy scopes and both were extremely bad in responding, when any kind of math or extra functionality was turned on.

I never had these problems with any of the Agilent / Keysight scopes.




nctnico:
I tend to agree with that assessment. Although: are the Agilent / Keysight scopes you are referring to using decimated data or acquired data for math? One of the (few) good things about Lecroy scopes is that they use acquired data for math (not sure about the various rebadges they sell) .
2N3055:

--- Quote from: HighVoltage on August 06, 2022, 03:54:00 pm ---

--- End quote ---
That is a sleazy comercial, not something I would expect from a great company..
(i don't like comparisons from LeCroy or Tek either, they all go too far in this kind of material)

Comparing 1 GHz/2.5 GS/s with a 8 GHz 40GS/s and noting the lather one is more accurate near 1 GHz...
And showing ENOB for only one amplitude that incidentally sits in Keysight  sweet spot...

As for Keysight scopes being more "responsive" to user input that is what they optimize for. There are people that do lots of simple, fast operations with a scope and demand "instantaneous" response to user commands.
Even if that means that scope is slow calculating.  I see that with my MSOX3104T compared to SDS6104H12.
Simple waveform view, edge trigger and it feels like analog scope.. up to 1 Meg trigs per sec.... Amazing.
I switch on math, and FFT updates every 2 seconds, and that is on puny 64 Kpoints.
At the same time SDS6104H12 will update 8 MEGpoint FFT several times a second...

I see your statement more as a testament you are doing specific type of work and use scopes in a way that Keysight concept suits you. And I have a feeling you mostly prefer Infiniivision series (3000/4000/6000).
Because S series in that video has same concept as LeCroys (just cruder), and is even slower to drive for everyday work.

LeCroy is niche, or not. They are great for R&D, science folks, test... They are "scopes with analysis lab built in". If you need that, they are first choice, if you don't, than you don't...
I find them logical to setup, but I never was a button twiddler, more of a make plan first before doing something...
We are all different and have different needs..
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