DIY Logic Analyzer Probe and Pods for Siglent (and LeCroy) scopes

[MathWizard]

Yeah I'm just trying to get it working with what I have. I ordered a DreamSoucre DSLogic U3Pro32 Friday.

But hey I got it working, it really was that the PCI-E connector was a few tenths of a mm too thick, with the added solder/wires. The contact is still not great, not every time anyways.

Here a picture of some audio channel, and volume control data, that I'm bare-metal coding onto an ATtiny13A, to fix my stereo.

And here's a 3.3V 25MHz square wave from my SDG2142X, either triggered from CH2 or D7, which is the farthest from the data probe GND pin.

And my CH2 scope probe has the big long GND lead, and I'm just clipped on a few cm away from the series 360R resistor I probed, before it enters the scope. So the signal's probably a bit better than it looks.

[rb720]

I'm about to purchase a SDS2204X HD. Will this DIY probe work with it, or is the software locked? I probably only need low frequency use, so the DIY probe could make sense for now, could buy the SPL2016 later if I need more bandwidth/precision.

[tautech]

I'm about to purchase a SDS2204X HD. Will this DIY probe work with it, or is the software locked? I probably only need low frequency use, so the DIY probe could make sense for now, could buy the SPL2016 later if I need more bandwidth/precision.

MSO licensing for all DSO's that support it has been abolished in recent firmware.

This allows one MSO probe to be used on any scope that supports it.

[rb720]

Thanks for the info, placed the order today with Saelig. They gave a 5% discount for reading the eevblog.

[TERRA Operative]

Has anyone tried this with coax cable like this?
Would it work as-is, or require a different set of capacitors and resistors?

https://www.aliexpress.com/item/1005005981763537.html


I'm also thinking of getting some of these clips, they look like clones of the old Tek type, but in nice colours.

https://www.aliexpress.com/item/1005008554552656.html

[BillB]

A bit late to this game but am looking into LA probe options for an SDS2104X+.  Has anyone seen or have any experience with this one?   

eBay auction: #375653175323

It's sure seems to be a copy of oz2cpu's design, given that it seems to use his image he posted in this thread of the first test!  I can't tell from the images if it's a 2 or 4 layer PCB, and the use of the twisted ribbon rather than coax is kinda a turn-off.  That being said, the price is a little more tolerable for me.  I'm a little too time and skill constrained to embark on my own DIY version.   

[mawyatt]

First check with oz2cpu (Thomas) to see if this copy is approved, he may have some that he will sell.

Best

[affe00]

hello,

I'm very much appreciative to your discussions before! Based on the information here in this topic, I had my proposal, and I wish to know your comments.

my proposal is this:

pci-e socket on scope <=> PCB board with 16x I-PEX MHF 4L receptacles <=> 150mm micro-coax wire with MHF 4L plug / SMA socket
<=> 300mm RG316 wire with SMA plugs <=> tiny, single channel PCB, with 250\$\Omega\$ + 90.9k//8.2pF, SMA socket on one end , 2.54mm pins on the other end.





the tiny single channel PCB board can be then protected with PI tape and heat shrink tube.

the good things about this proposal are: 1) micro-coax cable and RG316 cable. 2) channels can be attached/removed as needed.

Any comment, please?
I also wish to know how the resisor/capacitor values may be tuned to better suit the 50-ohm coax cables?

thank you!

[oz2cpu]

Hi Affe
I am happy someone keep playing with this, I am still very happy about mine.

The answer : you can not do any of this,
this probe design NEED high impedance twisted pair cables,
they are cheap thin flexible and easy to work with,
no need to change or modify this import part of the project