General > General Technical Chat
Is this product a BS didn't it?
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ejeffrey:

--- Quote from: vaualbus on October 17, 2021, 07:30:02 pm ---I recall I went to a keysight meeting a while ago where they show their at the time top of the line scopes (63Ghz @80 Gbs/s or what was) doing automatically validation and compliance test on USB3 buses, that is what you need.

--- End quote ---

Verifying that a USB controller is properly implementing the protocol is orders of magnitude more complex than testing a cable. I don't know anything about this device but nothing there seems particularly implausible. 
sandalcandal:

--- Quote from: EEVblog on October 18, 2021, 06:24:10 am ---I have not watched the video, but right off the bat I'd add that you can very usefully test cables by simply flogging the phy at full speed and lookind for bad packets etc.
I've done this with 10Gb ethernet interface FPGA designs. Just flogged it for a hours and get an accumulated error count. No need for actual quantified signal integrity measurement.

--- End quote ---
A few hours per cable seems excessive. The device shown does a decent looking set of tests in under a minute (?) and also produces some eye diagrams. However LTT didn't actually look closely at the technical details of the testing, that would probably be lost on their audience. They did give a decent layman's intro of what an eye diagram is however.
sandalcandal:
User manual here: https://www.totalphase.com/support/articles/360023273894-Advanced-Cable-Tester-v2-User-Manual
Shows screenshot the eye diagram based signal integrity check.

User manual also goes over the other tests the device does.
I remember them showing the eye diagrams in the LTT video too.

Seems a bit knee jerk to call it BS. Looks like an alright bit of industrial test gear for on the lower end of specialised test gear price. It does feel a bit out of place on the consumer oriented LTT channel though Linus mentioned good motivation for having one. They also did hire some "real" engineers recently that have popped up in a few videos giving advice.
eti:

--- Quote from: wraper on October 18, 2021, 06:12:17 am ---
--- Quote from: eti on October 17, 2021, 09:42:43 pm ---As clever as Linus is, he is NOT an electronics or test eqt channel, and were I him, I'd surely delegate that kind of approval to someone live Dave, or countless members here.

--- End quote ---
And what equipment Dave has to make such measurements? Not to say some specialized tool which will do it very fast and hassle free. What incentive he has to spend time on this to begin with?

--- End quote ---

Dave is an EXTREMELY experienced, qualified electronic engineer with many decades of experiences, whereas Mr Sebastian is a youngster, and with all respect, a bloke that plugs modules together and tests them - and yes that is a job requiring experience, but unless I am lacking info regarding Mr Sebastian, he IS NOT an electronics engineer (I've seen plenty of times where he appears rather clumsy in his videos - either he IS, or intends to portray that image... although... WHY he'd want to do so is baffling)

Your open-ended Q regarding Dave's "incentive" et cetera... sorry, but what? I am confused as to what you want to know - a rather poorly worded question?
wraper:

--- Quote from: eti on October 18, 2021, 06:48:17 am ---Dave is an EXTREMELY experienced, qualified electronic engineer with many decades of experiences, whereas Mr Sebastian is a youngster, and with all respect, a bloke that plugs modules together and tests them - and yes that is a job requiring experience, but unless I am lacking info regarding Mr Sebastian, he IS NOT an electronics engineer (I've seen plenty of times where he appears rather clumsy in his videos - either he IS, or intends to portray that image... although... WHY he'd want to do so is baffling)

--- End quote ---
Good enough explanation for a layman (target audience). And so what? This tester does not require any experience to get a result of passing or not. Plug the cable and run the test.

--- Quote ---Your open-ended Q regarding Dave's "incentive" et cetera... sorry, but what? I am confused as to what you want to know - a rather poorly worded question?
--- End quote ---
What does Dave get from testing tons of cables? EEVBLOG is not even a computer hardware channel. So making cable comparison for non target audience makes little sense. Of course he could make a video about the eye diagram (and I think he actually did before) and testing a few cables, but that's it.
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