<_whitenotifier-a>
[scopehal] azonenberg 1559b10 - LeCroy: improvid robustness of 8b10b trigger handling and avoid sending malformed control characters when configuring a new trigger object
eightdot has quit [Server closed connection]
eightdot has joined #scopehal
lethalbit has quit [Remote host closed the connection]
lethalbit has joined #scopehal
d1b2 has joined #scopehal
<d1b2>
<esden> test
<esden>
test
<d1b2>
<esden> ok should be back
<dingwat>
mildly offtopic but someone in here might know, what's the absolute thinnest _and_ bendiest coax anyone has worked with? Specifically it should be at least thinner than 1.2mm and as flexible as possible
<azonenberg>
dingwat: let me look up something h/o
<azonenberg>
https://koaxis.com/kf047 this is 1.52mm and is among the thinnest i've worked with but its super noodly
<azonenberg>
1.19mm plus the FEP jacket
<azonenberg>
Samtec ARC6 cabling is twinax, let me see how thin that cable is...
<dingwat>
for context, our techs are complaining that the keysight power probe coax tips can break ceramic caps if you look at them wrong. And I want to build some Z0 probes for rail ripple measurements for use with our 8ch scope
<azonenberg>
i dont know if you can buy just the cable but not as part of a harness
<azonenberg>
dingwat: I use KF047 on my solder in probe tips
<azonenberg>
specifically because of how noodly it is
<azonenberg>
i normally terminate in a SMPM but have experimented with (still in progress) direct solder terminations to stripped pigtails as well
<d1b2>
<azonenberg> thanks
<azonenberg>
dingwat: in particular, KF047 has pretty high insertion loss in terms of dB/meter especially at higher frequencies compared to e.g. KF086 or KF120P
<azonenberg>
but it's excellent at not putting stresses on tiny solder joints
<azonenberg>
For complex solder in probe setups where i want low loss and good flexibility, koaxis has a custom in house solderable splice assembly for bridging from 0.047 to 0.086 cables
<azonenberg>
one of my favorite probe cables is 30 inches of KF086 as a low loss home run spliced to 6 inches of KF047 as a strain relief leading up to the business end
<azonenberg>
get some kapton tape, secure the KF047 to the DUT, tape down the splice or the very end of the KF086, and you're good to go
<azonenberg>
This is going to be my standard test cable for most of my solder in probes once they hit production
<dingwat>
ok that's very good info thank you
<azonenberg>
(return loss of the splice is excellent, I order all of my cables with serial numbers and factory touchstone files and the data they've sent me has been great)
<azonenberg>
in general koaxis is a custom cable shop, they will make you pretty much any combination of cable stock, length, markings, and terminations you want as long as it's physically possible
<dingwat>
i'm gonna guess the answer to "how expensive" is "if you have to ask you can't afford it" hehe
<azonenberg>
Actually no they're shockingly cheap as custom high end cables go. Those 30/6 KF086/KF047 hybrids i wanna say were on the order of $100-120 with MOQ of 2 units and that included serialization, vna testing, and serialized touchstone files
<azonenberg>
and phase matching
<dingwat>
holy moly. Ok that's nice. I dunno exactly how we'd do it, but probably just ask for a single connector on one end. Maybe just straight to BNC-M and put the scope close to the board :)
<azonenberg>
You can order custom pigtails with stripped ends and whatever you want on the other end, assuming a compatible connector is available (e.g. BNC on a .047 probably isn't going to be possible for mechanical reasons)
<dingwat>
ah I didn't think of that. Maybe some kind of press-fit, SMB or something. And then buy a pile of BNC to SMB cables
<azonenberg>
Back in October 2024 I quoted six inches of KF047 with cut/stripped ends to SMA
<azonenberg>
$40.25 @ single units, $26.50 each @ qty 5, down to $16 @ qty 500
<azonenberg>
that included strip to shield/center conductor exposed for specified lengths
<azonenberg>
dingwat: dm'd you my sales contact
<azonenberg>
wrt z0 probes for rail measurements are you looking for 500 ohm resistive probes? or more like a 1x?
<dingwat>
azonenberg: I'm undecided. Generally everything is gonna be <=3V3, so a 1x would be ok wrt to scope input voltage
<azonenberg>
yes, but heavy loading can cause problems wrt power supply behavior
<azonenberg>
by adding dc load
<dingwat>
yeah
<azonenberg>
i love my lecroy rp4030s and would love to make an open hardware competing design eventually
<azonenberg>
anyway, if for power rails or otherwise you want some of my AKL-PT5s I can probably hook you up pretty soon even if i'm not officially taking volume production orders yet
<dingwat>
so I think 500R probes is the better option, and should be at least better than what we're doing now (passive 10M probes)
<azonenberg>
i have a production sample on my desk
<azonenberg>
better than +/- 1 dB flatness from DC to 6 GHz and then slowly peaks, excellent performance out to 16+ GHz if you de-embed the response curve
<dingwat>
azonenberg: 450R?
<azonenberg>
yep
<dingwat>
nifty. What flavor is the connector?
<azonenberg>
SMPM
<azonenberg>
the standard cable for it will be that 30/6 inch KF086/KF047 cable i mentioned