Products > Test Equipment
DIY Logic Analyzer Probe and Pods for Siglent (and LeCroy) scopes
mnementh:
After considerable reading on eevBlog and some time in Frustion360, I've devised an alternate solution which leverages TK's adapter PCB to connect directly to the HP logic probe pods; tautech seemed to quite like the project and suggested I post in here about it, so here's the link:
https://www.eevblog.com/forum/testgear/diy-logic-probes-alternate-approach-using-tks-adapter-pcb/msg4326775/#msg4326775
Cheers!
mnem
:-/O
rogersstuart:
I recently purchased a 2pF active probe and compared measurements with that to a simulation using VNA measurements and an EM simulation. I found that with an FFC a value of 5.1 pF at the input of the scope leads to a nearly perfect 1/10 voltage divider. There is a little overshoot but not much ringing. The VNA measurement shows almost no ringing which leads me to believe that any ringing is simply a grounding error. The biggest variable in regard to voltage level at the scope input is how much the cable loads the signal. If you intend to use the full range of 10V then I suggest decreasing the value of the capacitor. The quality of the cable does matter but this isn't really the most high speed logic analyzer out there and you will find that the signal jitters around a bit as the specs state in the datasheet regardless of the "quality" of the cable used.
aystarik:
Hi,
I've desided I want my own design of the PCB for RF1.37 (https://aliexpress.ru/item/1005003601266058.html) coaxial cables (1 ground pad for each input) : and also make it more "equal". I think I'll try to have input-end 120 ohm resistor directly on the cable, without additional boards -- like here: https://community.element14.com/technologies/test-and-measurement/b/blog/posts/building-solderable-in-circuit-oscilloscope-probes
github repo with kicad project is here: https://github.com/aystarik/siglent-la
Wahyueko:
I want to make it for my MSO5000
tautech:
--- Quote from: Wahyueko on January 06, 2023, 06:05:24 pm ---I want to make it for my MSO5000
--- End quote ---
It has its own thread dedicated to DIY logic probes.
Use the forum search.
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