azonenberg changed the topic of #scopehal to: libscopehal, libscopeprotocols, and glscopeclient development and testing | https://github.com/azonenberg/scopehal-apps | Logs: https://freenode.irclog.whitequark.org/scopehal
<azonenberg> v1.4 board is at fab now but i'm already beginning to run simulations of what v1.5 might be like
<azonenberg> the cyan trace is -20.9 to -19.5 dB from DC to 5.5 GHz then falls off
<azonenberg> with -3 dB at 6.75 GHz
<azonenberg> Some slight ripples still (0.3 dB p-p roughly) that a de-embed could flatten out. not sure if it's worth the effort to try and eliminate them
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<azonenberg_work> https://www.youtube.com/watch?v=Jjh-g0YiAsY starting assembly/test shortly
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<azonenberg> So, AKL-PT2 bringup/assembly done
<azonenberg> waiting until tomorrow for silicone to cure to do characterization on an overmolded board
<azonenberg> but so far performance is great and exceeds expectations
<_whitenotifier-5> [scopehal] sam210723 synchronize pull request #396: Add binary capture file parser - https://git.io/JtyXM
<_whitenotifier-5> [scopehal] sam210723 reviewed pull request #396 commit - https://git.io/JqUhz
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<d1b2> <theorbtwo> I have no idea what I am looking at, but it looks rather good?
<azonenberg> theorbtwo: AKL-PT2 characterization results
<azonenberg> the solder-in flex probe
<azonenberg> see the youtube link above, i livestreamed the whole lab session if you wanna watch the replay
<d1b2> <theorbtwo> Hmm, I might.
<azonenberg> The probe exceeds performance expectations, over 4 GHz bandwidth, fairly smooth rolloff response
<azonenberg> sub 80ps 20-80% risetime on a 4 GHz scope
<azonenberg> in other words, actual rise time is faster than my scope can measure
<azonenberg> a few small ripples that i'm not thrilled about in the upper part of the band
<azonenberg> but they're only ~0.5 dB p-p
<azonenberg> this is also raw s-parameters off the test fixture with no de-embed
<azonenberg> so there's actually loss in the fixture etc which means the actual probe response is even better than this
<azonenberg> Anyway, the tl;dr is that I have 250 of these boards, they do everything I want
<azonenberg> I have one potted in silicone curing now, tomorrow i'll test if parameters shifted at all from the overmolding
<azonenberg> I expect i will be making a few small changes to the overmold, probably 3D printing one last prototype
<azonenberg> then CNCing a 10-probe gang mold
<azonenberg> as soon as that comes in, i can start scaling up and offering assembled units to the general public
<azonenberg> The AKL-PT1 should be general availability soon too, but i'm waiting on 1-2 more prototype iterations to try and flatten out the peaking that TSP pointed out in his review
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<apo> Fucking rigol bullshit
<apo> I need to buy a decent scope
<apo> https://p.0au.de/4b16e58b/ look at this crap :(
<apo> Goes "I have 0 samples for you!" for a while, then suddenly starts shitting samples all over the place when I'm not asking for them
<azonenberg> apo: lol
<azonenberg> that sounds very rigol all right ;p
<tnt> It's just learning ... you asked for data twice and it couldn't provide any. So sensing your disappointement, it tried to be proactive and provide you sample as soon as it had some.
<azonenberg> lolol
<bvernoux1> hello
<bvernoux1> I have some news about Rigol R&D
<bvernoux1> They are working on the SCPI slowness on Rigol MSO5000
<bvernoux1> I shall have some news next week as they are working on a new firmware
<d1b2> <TiltMeSenpai> oh wait awesome
<d1b2> <TiltMeSenpai> I'll probably have to wait for the forums to develop a "hobbyist license" for it but
<azonenberg> woop, first prod rev AKL-PT2 is out of the mold
<azonenberg> so far the clips are fitting quite well
<azonenberg> Hmmmm
<azonenberg> So there are some ripples in the response with the silicone added
<azonenberg> And they're bigger than I'd like, about a dB p-p
<azonenberg> I mean it's still quite flat compared to a lot of the alternatives
<azonenberg> Red: AKL-PT2 with overmold, fixture de-embedded
<azonenberg> Green = Pico TA061
<azonenberg> Blue = LeCroy ZS1500
<azonenberg> Pink = PicoConnect 921
<azonenberg> This feels like a slight impedance match at the SMA but it's hard to be sure
<azonenberg> There is a dirty trick i can try on the other (not overmolded) board to flatten it out a bit. If my ground plane cutout is too big
<azonenberg> i can try sticking some copper tape on the back of it :p
<azonenberg> actually no, the stiffener is in the way
<miek> might be useful to look at it in the time domain, to see if it's at the SMA
<azonenberg> this is channel emulation of a super-fast (basically 10ps risetime) pulse into the measured s-parameters
<azonenberg> With best guess of the fixture de-embedded
<azonenberg> Quite interesting, to say the least
<azonenberg> sharp rise, then slowly increasing with gradually decreasing closely spaced ripples, then a dip
<azonenberg> I am fairly sure that dip is the SMA
<azonenberg> it's at 1.6 ns
<azonenberg> SMA to resistors is 140 mm
<azonenberg> and sonnet's calculated one-way propagation delay for that distance is 760 ps
<azonenberg> So it seems my plane cutout is actually too *small*
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