Products > Test Equipment

Test Equipment Anonymous (TEA) group therapy thread

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mnementh:

--- Quote from: tggzzz on July 09, 2022, 09:05:10 am ---
--- Quote from: tautech on July 09, 2022, 12:15:49 am ---
--- Quote from: mnementh on July 08, 2022, 11:50:48 pm ---
--- Quote from: tautech on July 08, 2022, 08:50:57 pm ---TBH if you can be bothered to cobble something together use the oz2cpu/Defpom method.
Why, because of mwyatt's contribution simulating my measurements to come up with the values of the passives in the networks of the OEM probe.
These things OEM whom as yet I've not found who makes them are damn expensive but don't forget a 20 lot of decent  quality grabbers alone will set you back a C note !

Or if you not in a hurry, keep an eye out for one that looks identical but made for LeCroy, Tek or Rigol and a little sleuthing on each of their websites will get you the Pt. # to look for.......then post them in the DIY thread for the benefit of others.  ;)

I'm 100% they all have the same OEM and the twin thin silicone 8 way ribbon coax (that's a mouthful ! ) is a thing of beauty and near impossible to emulate unless you got mates in the company where it's made to get offcuts !
That's why Defpom went the route he did so to get something nice for his efforts rather than some cobbled together twisted pair mess.

Last year Siglent were specialing SPL2016 + MSO/LA and AWG/FG licensing with a new SDS2000X Plus for just $ 219 that was one hell of a deal compared to shelling out retail for each.
--- End quote ---

Actually, I was thinking to make a header so I could plug the HP pod and whip leads directly into the oz2cpu scope PCB. As I said, those will probably be more than long enough for anything I'd be doing, unless I change my mind and put the scope up higher on my bench, which is pretty unlikely ATM.

I was asking about MK's project since you linked to it at the beginning of the SDS2000X thread. :-// Not knowing what the difference is between the Siglent frontend and the HP braided cables, I'm leery of just plugging random lengths of either braided cable or micro-coax into the front of the scope without any compensation, or the wrong compensation. I saw the issues oz2cpu was having there in the beginning.

mnem
 :-/O

--- End quote ---
OK so if you already have the HP pod den go widdat !
Be aware you only need get something 1/2 clean into the LA input terminals as what's shown on the display in Digital mode bares little resemblance to the actual signal. IIRC there's discussion about this in the DIY thread.
IMO coax LA probe set compensation is likely to be pretty much an industry standard however the truth of the matter is suck it and see.
But the fact that we don't see cries that 'it don't work properly' for any of these DIY creations which points to them being fairly forgiving.

--- End quote ---

General principle: assure yourself that you have sufficient analogue signal integrity. Then flip to the digital domain with an LA ot printf() etc.

If you do that then there is a good chance that there is sufficient leeway on the analogue waveform for it to be correctly interpreted as a digital signal, even with a crappy termination. That, after all, is a main benefit of digital signals.

The exception could be with the clock signal, especially if the other signals are close to setup and hold time limits.
--- End quote ---

Pretty sure the LeSiglent doesn't have the CLOCK input that older LAs use to sync everything; tho I suppose I could break that out to the EXT Trig... might be useful in some cases.  :-//

I have been looking for a "correct" set... but the other brands are as expensive or even more so... I even looked at the older SPL1016 and they're still $170 shipped. By the time I get all that happening and the oz2cpu scope PCB built, still looking at as much money as I have in the scope itself.

Meanwhile, the HP Pods by themselves are usually available for $25-35. Seems a no-brainer, if you don't need a braided cable long enough to reach to the back of a Pliocene-era LA.  ;)

A good compromise for hobbyist use, no?  :-//

mnem
 :-/O

bd139:

--- Quote from: xrunner on July 09, 2022, 02:14:46 pm ---Ready to put in my Ryzen 5 5600G  8)

--- End quote ---

Fingers crossed you updated your BIOS first  :popcorn:

mnementh:

--- Quote from: Specmaster on July 09, 2022, 01:38:49 pm ---
--- Quote from: mnementh on July 09, 2022, 12:14:51 pm ---
--- Quote from: mnementh on July 09, 2022, 12:00:58 pm ---       
*yawwwwwnnnn* "This will probably be at least a 3-coffees move."
--- End quote ---

Allright... maybe slightly more than 3 coffees... The mouse on my workshop PC has developed a hinky left button, resulting in very random double-clicks and dropouts while highlighting.

mnem


--- End quote ---
And that ladies and gentlemen is why Dragons are now extinct, they sat way too close to the computers they were trying to delete with far more than 50gm of explosives   :-DD :-DD :-DD :-DD
--- End quote ---



"I'm fireproof. You're not." ~Hellboy

mnem
*nuking the mouse*

mnementh:

--- Quote from: mnementh on June 05, 2022, 11:05:02 pm ---
--- Quote from: bd139 on June 05, 2022, 10:26:49 pm ---
--- Quote from: Vince on June 05, 2022, 10:12:09 pm ---Yeah I would not bother either ! Well I would not own such a piece of junk to begin with.... but as I explained I am under a moral obligation to go the extra mile to rescue this thing.


However after what you and Dwagon said, it's realllly looks like it's that cheap disposable CPU that's toast USB wise, so the "extra mile" is 99% covered already....

All I can do now to be 100.0000% sure it's the CPU, so I can look my friend in the eyes... is to make 100% sure there is zero discrete component between the CPU and the USB connector power pin.

So I need to find the datasheet for the CPU... and sadly I just spent 10 minutes on Google and NO LUCK ! This CPU is so crap apparently that you can't even find a datasheet for it.... :blah:

So looks like I have reached the end of the road.... pfff....

People keep thinking/assuming somehow that electronics and simple and can be fixed easily in 2 minutes for free. I keep telling them that no, it's the other way around : there is a millions things that can prevent you from repairing a device, and that a quick cheap repair is not the rule it's the exception ! But when I tell them that they look at me suspiciously, like they are thinking I am either incompetent or trying to find excuses because I am lazy and don't work to spend  any time on their stuff...

--- End quote ---

Had that for years. I impolitely explain my time is worth more than the device is worth. That usually gets the point across. Same with computer problems.

Had a recent one with my uncle who wanted his laptop repaired. It’s about 8 years old and quite frankly disgusting. I don’t even want to touch it. I impolitely explained that it doesn’t matter what you want me to do you will have to pay me the hourly rate for what I could have been doing instead because my time isn’t worth it. He bought a new one.

And that’s the reality of a lot of repairs these days. I only play inside old test gear for fun.
--- End quote ---

Yup. Same for me and old computers. A while back I bought a "WalMart Special" Acer laptop with  N2840 CPU/4GB RAM/500GB HDD. I took on the usual warnings in here that it wasn't worth the money to fix it up, but I wanted to see what was inside of it and fix it up to keep my diag skills sharp.

Right now I'm in it for $67 and it runs half-decent but still spinning rust slow; I'm toying with the idea of popping in a old 120GB SSD I unearthed the other day to make it more attractive before I flip it. :-//

But this was all for the fun of fixing and keeping my skills sharp; I know when I do flip it I'll get $100-125 for it, so not even breaking even on my time.   :o But the difference is it's my toy, my time and my choice whether to spend it that way or not.

mnem
 :-/O

--- End quote ---

After reducing it twice, sold for $90. With the 120GB SSD in it. Plus I kept the 500GB WD Black spinning rust disk out of it to store movies on. ;)

mnem
"Still beats a sharp stick in the eye." ~gramma Eddurds

xrunner:

--- Quote from: bd139 on July 09, 2022, 02:33:24 pm ---
--- Quote from: xrunner on July 09, 2022, 02:14:46 pm ---Ready to put in my Ryzen 5 5600G  8)

--- End quote ---

Fingers crossed you updated your BIOS first  :popcorn:

--- End quote ---

Yea I did, I got burned on that mistake once. Once bitten twice shy.  :-DD

I'm using it right as we speak. After a few restarts for typical driver updates it's running fine.

We're cooking with gas now baby!

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