Author Topic: impedance measurement with VNA using series, shunt/series through methods, graph  (Read 9350 times)

0 Members and 1 Guest are viewing this topic.

Online joeqsmith

  • Super Contributor
  • ***
  • Posts: 8264
  • Country: us
I guess he is using a ground spring ? but I haven't seen any.

The signal was probably pre-recorded anyway and he is "lip synching" the manip  :)
Lip synch,  :-DD    I would expect him to use the spring or wire wrapped around the tip with that 6" removed.  He may have very well used the springs but I couldn't see it.  If there's no spring, I wonder what the reference was.  I would have thought the little board he shows was isolated. 

To Joe:
Why not ask VirtualParticles to open it up and see how it's made?

There are a few reasons.  I'm not so brash that I would ask anyone to pull their equipment apart.   He stated he does work with them and I think helping reverse engineer their product would be a pretty unprofessional move.  Brian collected the S-parameters for us which is really all I needed to get an idea what it was.   Last, I thought that it may be potted.  I was actually thinking I could borrow one to X-ray if it came down to it. 
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
Software, documentation and test reports for the low cost NanoVNA & V2 Plus 4 may be found here:
https://github.com/joeqsmith
 
The following users thanked this post: YetAnotherTechie

Offline coppercone2

  • Super Contributor
  • ***
  • Posts: 5658
  • Country: us
  • $
making those spring bushings is really hard to get right. at least I have an assortment of spring wire now
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf