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Looking for tip-to-BNC adapters for Siglent SD1102X ocillocope probes

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VinzC:
Hi.

I'd like to make my own near field probes. So, instead of building the complete probe + BNC cable, I came up with the idea of extending my Siglent SD1102X probes with a custom adapter. I've spent the entire day trying to find potential adapters but search engines are utter crap at giving me what I want¹, as the more I am specific, the less relevant the results, so I grew fed up of searching.

I've yet found a couple of accessories on Digikey, Mouser though but they do not specify the dimensions, unfortunately. And I deduced there's no standard. All I can find, when dimensions are specified is "2.5mm", which won't fit anyway. That's why I (naively) believed I could find clues on the internet. In vain. As usual.

Anyway, the dimensions for my scope probes are as follows, measured with a calliper (not a digital one):

* tip diameter: ~1.2mm
* tip length: ~4mm
* outer diameter (metal ring): 5mm
I've looked up at Siglent but the price is a showstopper and I don't find results that match my scope. So I'm bound to making them on my own.

I'm hesitating between making a PCB-based near field probe with a PCB-style BNC connector or just make one with a coax cable attached to a BNC connector, as Dave IIRC once suggested a while ago. I don't know however if there exists adapters such as "tip-to-PCB" though. Regardless, I can do with whatever is available.

Do you have product references, which I could buy from Mouser or Digikey? (I prefer avoiding cheap and non-electronics resellers such as ebay, amazon, ali-something, you know what I mean).

Thanks in advance for any clue you may share.

¹ Maybe I'm the idiot who cannot even figure out how to make web queries, it's still a possibility...

Aldo22:
I have an adapter from Aliexpress.
The 5mm adapter should actually match your dimensions.
BUT: The length of the metal ring is also decisive.
In the picture, the first 3 probes work for me but not the last one.
The last ring is only 4mm long, the others 6mm long.

VinzC:
Are these adapters not available via reputable channels such as those I listed?

tautech:
Check with Siglent EU if they are stocking PAK2.
https://siglentna.com/product/probe-accessory-kit-pak2/

info-eu@siglent.com

shabaz:

--- Quote from: VinzC on October 06, 2024, 03:33:35 pm ---Hi.

I'd like to make my own near field probes. So, instead of building the complete probe + BNC cable, I came up with the idea of extending my Siglent SD1102X probes with a custom adapter.

--- End quote ---

That doesn't solve for your actual requirement, though (there are plenty of uses for the tip-to-BNC adapter, of course, but specifically for the requirement you mention of a near-field probe).

If you have to buy that, then you may as well just buy the right parts (if you want to DIY the probe, that is), which will be a ready-made BNC cable with thin, flexible coax and a ready-made short, semi-rigid SMA cable with the same connector as you have on the end of the flexible cable. All should be available on Amazon, eBay etc.

The response won't be flat or calibrated, but that's often not important at all versus just seeing activity. Once you have the parts, there are many online resources showing you how to solder the loop.

The attached photo shows typical example parts (you won't need all, and it depends on what you buy). You can see a longer, thin, flexible coax cable to attach to the 'scope. The short blue cable happens to be semi-rigid, and it could be cut in half. The other two items are adapters, if required, to get the flexible cable attached to the semi-rigid cable.

Just a personal choice, if it were me, I'd go for the PCB-based approach (nothing invalid with the plain coax approach of course; that's just as effective). You don't even need to design it; there are existing H-field probe designs. The Gerber files are downloadable from there, all ready for uploading to any PCB manufacturer's website.

Using that PCB requires a side-mount SMA connector and then a thin, flexible BNC cable (with SMA on the other end), and then that's it. If you can't find a BNC-to-SMA cable, then you'd go for the SMA-to-SMA cable, and use an example BNC adapter like the one in the attached photo.

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