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I'm going to build a number of ground clips for the P6100 series
probes that terminate in a 0.025 square connector.

I have those connectors, but I don't have a good source of the clips
for the scope probe body.

A good example of the probe would be a P6105. I'd also like to see if
there's an inexpensive source of the slip on 0.025 probe tip adaptors
as well, although those might be a 3D print option.

It does occur to me that I may be able to make a whole probe slip-on
adaptor that bypasses the need for the ground clip, but I'd like to
see if I can do the standard ground clips.

Harvey

Harvey,

I have found that for me the most practical solution is to use BNC
adapters and directly solder to the BNC end.
Yes, this means you also need to make the center connection in that
manner, but that is really more practical anyway.

I have about 2 inches of silicone or teflon wire soldered to the BNC
end (red/black) and a 0.025 square single connector.
The square connectors plug into pins soldered on the PCB, or more
often into Hirschmann micro Kleps:
<>

I also have a set of these BNC adapters with just wires connected to
them, which I can solder directly to boards (and leave connected for a
while).
The BNC adapter body is protected with a section of silicone tubing to
prevent shorts to ground.
It looks similar to this part from Lecroy (PMK):
<>

I haven't used a probe to poke on something directly for probably
years, and haven't used a "witch hat" hook tip for even longer.
They really aren't very practical for my line of work.

There is an impact on signal fidelity of course, but often times I bet
I have it better than a regular ground clip lead, and if needed I also
have sockets I can solder on a PCB to stick a probe in directly.

ST

BTW you can get the standard ground lead with the probe side spring
and crappy alligator clip on Digikey for $2.65:
<>

The one with the marginally less crappy alligator clip can be had for $10:
<>


ST

On Thu, 29 Nov 2018 19:19:49 +0100, you wrote:

Harvey,

I have found that for me the most practical solution is to use BNC
adapters and directly solder to the BNC end.
Yes, this means you also need to make the center connection in that
manner, but that is really more practical anyway.

I'll have to think about that, don't have any of them, either. (maybe
one or two that came with a 7A11?)

I have about 2 inches of silicone or teflon wire soldered to the BNC
end (red/black) and a 0.025 square single connector.
The square connectors plug into pins soldered on the PCB, or more
often into Hirschmann micro Kleps:
<>

I have a half ton of 0.025 pin connectors. I use 20 pin adaptors to
the HP 16702B, otherwise, they can be test points.

I also have a set of these BNC adapters with just wires connected to
them, which I can solder directly to boards (and leave connected for a
while).

The way those things go, I'd be breaking wires. The boards move
around a lot in development.

The BNC adapter body is protected with a section of silicone tubing to
prevent shorts to ground.
It looks similar to this part from Lecroy (PMK):
<>

That was my option for a complete slip-on adaptor.

I haven't used a probe to poke on something directly for probably
years, and haven't used a "witch hat" hook tip for even longer.
They really aren't very practical for my line of work.

Depends on what I'm looking at. In normal scope repairs, I normally
will use a dip-clip or the hook adaptor for discrete parts. For my
own SMT projects, I have to design in the test points (frequently).

There is an impact on signal fidelity of course, but often times I bet
I have it better than a regular ground clip lead, and if needed I also
have sockets I can solder on a PCB to stick a probe in directly.

Similar to what I do with the logic pods.

So is the center pin in a BNC the same size as the probe tip in the
probe? That would be convenient.

Just checked, the probe tip appears smaller.

I see something happening with the 3D printer, maybe.....

Thanks

Harvey

ST




On Thu, Nov 29, 2018 at 6:48 PM Harvey White <madyn@...> wrote:

I'm going to build a number of ground clips for the P6100 series
probes that terminate in a 0.025 square connector.

I have those connectors, but I don't have a good source of the clips
for the scope probe body.

A good example of the probe would be a P6105. I'd also like to see if
there's an inexpensive source of the slip on 0.025 probe tip adaptors
as well, although those might be a 3D print option.

It does occur to me that I may be able to make a whole probe slip-on
adaptor that bypasses the need for the ground clip, but I'd like to
see if I can do the standard ground clips.

Harvey

On Thu, 29 Nov 2018 19:38:13 +0100, you wrote:

BTW you can get the standard ground lead with the probe side spring
and crappy alligator clip on Digikey for $2.65:
<>

Thanks, since I'm not using the alligator clip, I don't care about the
quality of the clip.

The one with the marginally less crappy alligator clip can be had for $10:
<>

Ouchie....

BTW: you *can* buy clips that look identical from McMaster-carr.
Problem is that they are not copper, they're 18-8 stainless or zinc
plated steel. Not sure that I want to try soldering to them.

This is assuming that the clips can be had in the right size.

Harvey

ST
On Thu, Nov 29, 2018 at 7:20 PM stefan_trethan <stefan_trethan@...> wrote:

Harvey,

I have found that for me the most practical solution is to use BNC
adapters and directly solder to the BNC end.
Yes, this means you also need to make the center connection in that
manner, but that is really more practical anyway.

I have about 2 inches of silicone or teflon wire soldered to the BNC
end (red/black) and a 0.025 square single connector.
The square connectors plug into pins soldered on the PCB, or more
often into Hirschmann micro Kleps:
<>

I also have a set of these BNC adapters with just wires connected to
them, which I can solder directly to boards (and leave connected for a
while).
The BNC adapter body is protected with a section of silicone tubing to
prevent shorts to ground.
It looks similar to this part from Lecroy (PMK):
<>

I haven't used a probe to poke on something directly for probably
years, and haven't used a "witch hat" hook tip for even longer.
They really aren't very practical for my line of work.

There is an impact on signal fidelity of course, but often times I bet
I have it better than a regular ground clip lead, and if needed I also
have sockets I can solder on a PCB to stick a probe in directly.

ST




On Thu, Nov 29, 2018 at 6:48 PM Harvey White <madyn@...> wrote:

I'm going to build a number of ground clips for the P6100 series
probes that terminate in a 0.025 square connector.

I have those connectors, but I don't have a good source of the clips
for the scope probe body.

A good example of the probe would be a P6105. I'd also like to see if
there's an inexpensive source of the slip on 0.025 probe tip adaptors
as well, although those might be a 3D print option.

It does occur to me that I may be able to make a whole probe slip-on
adaptor that bypasses the need for the ground clip, but I'd like to
see if I can do the standard ground clips.

Harvey

Stainless Steel can be pre-tinned with acid flux and either a large iron, or a solder pot.


Michael A. Terrell