Electronics > Projects, Designs, and Technical Stuff
Open HV Probe 40kV
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joeqsmith:
A fun project to work on, especially if you want any sort bandwidth out of it.   

I made a few attempts at making my own KV+ low energy probes.  The last someone dubbed the burrito probe for some reason or another.    This repair video shows what it looks like today and I talk about some of what I would change if I make another.  Not sure it will be much help.    Good luck.     

https://youtu.be/kWOe803atvg
beanflying:

--- Quote from: Zero999 on April 21, 2019, 01:37:42 pm ---I wonder if adding a suitable lacquer will help with the poor finish created by the 3D printing process? I imagine some kind of polyamide would be ideal.

--- End quote ---

Certainly can be externally coated post printing. As contamination would seem to be the main concern of others over time an epoxy coating would work well on the PLA. Easy to do and I have plenty on hand.
beanflying:

--- Quote from: joeqsmith on April 21, 2019, 08:29:01 pm ---A fun project to work on, especially if you want any sort bandwidth out of it.   

I made a few attempts at making my own KV+ low energy probes.  The last someone dubbed the burrito probe for some reason or another.    This repair video shows what it looks like today and I talk about some of what I would change if I make another.  Not sure it will be much help.    Good luck.     

https://youtu.be/kWOe803atvg

--- End quote ---

I will have a good look at your few videos Tautech linked too. One of the reasons to roll this probe was even a simple Calibration point of a 20MHz Scope last week was out of the range of gear I own. Having some bandwidth over a simple resistive divider would see it getting more use.
mnementh:
Please understand... my primary concern here is the "open" part of this project. As soon as you put that label on something, the fuckwits start to come out of the woodworks. Building it for yourself is one thing; sharing the blueprints online is something I'd consider to be roughly akin to all the imbeciles sharing plans for 3D-printable firearms, all of which are far more likely to kill the user than anyone more deserving such fate.

I've committed numerous Darwin-award-worthy acts of stupidity with HV transformers; my grand-dad started me early helping him wind a 3KV transformer for a 160m transmitter when I was 10.  :scared:

There's a reason I don't document the details of those adventures publicly; and as anyone in the TEA will tell you, it isn't embarrassment because I have not so much as a single shred of it left in my being. ;)

mnem
*tzzzt*

wasyoungonce:
How’s about gel coating the probe to increase issues isolation and reduce probes ability to ingress contamination.  If gel will not adhere....even better.  Use the 3D printer in negative and use the parts printed as fibreglass moulds.  FWIW
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