Products > Test Equipment
DC coupled 2.7 GHz Active Probe Project - Now Available!
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KungFuJosh:

--- Quote from: lasmux on October 03, 2024, 01:52:46 pm ---
--- Quote from: KungFuJosh on October 02, 2024, 10:52:53 pm ---@lasmux,

It might be easier to go the other way- use a conductive material for the case (or part of it) and then insulate it.

Thanks,
Josh

--- End quote ---
Yeah, this is something I've been considering. I originally discounted the option, but I think it could be done. Perhaps a conductive body, but with just the tip around the inputs as a non-conductive part.

--- End quote ---

I think that option is 100x easier than applying shielding reliably otherwise. You might want an insulated coating on the whole outer body, but even a good powdercoating might be sufficient and would like nice. You can have a powder coater insulate both sides, and mask the contact points you need to keep the shielding solid.
Mechatrommer:
either way, the shielding need to be connected to the circuit ground.
nctnico:
I don't know how the PCB design is currently, but it could help to put all signals on inner layers and have as much ground on the top & bottom layers as possible.
lasmux:

--- Quote from: Mechatrommer on October 03, 2024, 11:08:16 pm ---either way, the shielding need to be connected to the circuit ground.

--- End quote ---
Yeah for sure. It would be connected at the SMA side-launch connector, as the copper tape shielding method is.


--- Quote from: nctnico on October 04, 2024, 10:12:54 am ---I don't know how the PCB design is currently, but it could help to put all signals on inner layers and have as much ground on the top & bottom layers as possible.

--- End quote ---
That's not really feasible with this design.

I've had another look, and a conductive enclosure will really push the BOM price up, and that would push the probe away from the ethos of great performance at a very low price. I think the method of using a deliberate application of copper tape is cheap and easy to apply if the user thinks the noise pickup is too high. Again, this would only be the case where the noise level is high enough and measured signal small enough simultanously.
KungFuJosh:

--- Quote from: lasmux on October 04, 2024, 06:34:34 pm ---I've had another look, and a conductive enclosure will really push the BOM price up, and that would push the probe away from the ethos of great performance at a very low price.

--- End quote ---

By how much? If it's not too significant, and if it accomplishes the goal of improving the probe, I'm pretty sure people would happily pay it.
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