Products > Test Equipment
Coaxial cable, as a "high BW passive probe"
points2:
Hi,
I used the search engine but I found no thread related to that... so, here it is.
Why no info / thread about about it ?
It's weird to me given the price of high BW active probes... I have 2 1GHz active probes but à 1kEur/unit I can't pay higher price.
So, I went back from "nice" active 1GHz active to explore : coax cable as a high BW probe.
And so far so good !
What's your experience about a basic coax cable as a probe ?
shabaz:
By 'coax as probe' do you mean a resistive (I.e. Z0) probe?
If you Google 'Z0 probe' you'll come across lots of hits, including ones on this site.
jonpaul:
We used a 50 Ohm scope plugin/input or term, and a coapx BNC direct to a gen or source.
For probe, The Zo Probe is easily made.
BNC>><<Coax (we used RG/174/u) <> 950 Ohm 1% at tip.
Makes a 10:1 Zo probe cost <1$
Reccconend the excellent 1980s Tektronix Circuit Concepts books
Oscilloscope Provbe Circuits Concepts
Oscilloscope Probe Measurements
http://w140.com/tekwiki/wiki/Concepts_Series
https://www.davmar.org/TE/TekConcepts/TekProbeCircuits.pdf
http://archive.org/details/tektronix_Tek_Probe_Measurements
For cable properties see Belden.com
Enjoy!
Jon
ebastler:
--- Quote from: points2 on November 25, 2024, 04:03:16 am ---Why no info / thread about about it ?
--- End quote ---
https://www.eevblog.com/forum/projects/lo-z-probe/
https://www.eevblog.com/forum/beginners/diy-1x-oscilloscope-probe/
https://www.eevblog.com/forum/blog/eevblog-1367-5-types-of-oscilloscope-passive-probes-compared/
https://www.eevblog.com/forum/projects/passive-isolated-z0-prove-design-critic-welcomed/
https://www.eevblog.com/forum/testgear/making-an-201-coax-probe/
https://www.eevblog.com/forum/testgear/dc-coupled-high-bandwidth-passive-probe/
I'm sure there are more.
jonpaul:
We bought many TEL 10X Zo probes P61536 at cost $35..55
https://w140.com/tekwiki/wiki/P6156
3.5 GHZ the best!
Jon
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