How to connect Kelvin clips to 4 BNC cables?

kubeek

Joined Sep 20, 2005
5,734
4 tips of the BNCs go to the four connections to the clips. All the grounds on the BNCs seem to go to that point near the end of the cable, where I guess the shields are uncovered and tied together and the ground clip emerges, and the shields continue into the clips.
 

ErnieM

Joined Apr 24, 2011
8,058
A Kelvin clip like that will two electrically isolated tips, one for the forcing current, the other for the voltage reading (when measuring resistance).

The signal from each BNC goes to these connections. The shield is separate and does not connect to the Kelvin probes. It appears the B&K probes send this to a alligator clip; this is not used directly in the measurement.

The BNC cable you chose is not a shielded cable so you may be just as well off to forget the shield wires completely. That is not as bad as it sounds, the probes we use on our milli-ohmmeter that measures down to .00001 ohms has no shields on it's probes.
 
Last edited:
you didn't buy BNC cables. You could probably buy a couple of cables and chop them in 1/2. These cables may be RG-174 cables.

See: http://www.l-com.com/coaxial-rg174-...ansmission-lines-with-straight-bnc-connectors

Figure out what sort of mechanismis used for a strain relief on the Kelvin clips.

You likely want to make the alligator clip lead first.

So, you really get to pick one for which gets the alligator clip. It may be Hi-Curr-. Attaching the alligator clip is tricky.
You generally strip back the outer insulation such that the braid is exposed.

You then "poke" a hole in the shield and pull the center conductor and insulator through it. It's difficult.

For the others, expose the inner insulator and heat shrink. Heat shrink with adhesive might work better.

The shields, generally get connected at one end only. The clip is used to connect to say a shielded box, but not a grounded one.

I think the clip is ground.
 
Top