Modernizing a legacy 2410 SMU

Hi,<br> <br> We're trying to convert the banana jack outputs of our 2410 SMU to kelvin-sense triax. I see that you have part 2450-TRX-BAN which is used to adapt the 2450's triax to banana. Is there any reason that we couldn't use these to do a reverse operation on the 2410? (I understand that the 2410 can potentially put out much more voltage than a 2450, so let's assume for sake of discussion that we are only operating the 2410 out to 200V....)<br> <br> Thanks,<br> Daniel

Oh, and I should say, if you have any different ready-made cables that ARE suitable for use with the 2410 to allow triax connections, I'd be interested in those, too!

In addition to the 2450 related accessory, the 1100V model 2470 has similar one:  2470-1100V-BAN.

I see no reason not to operate them in reverse, e.g. plug the banana into rear of 2410 to present triax.

Take note on how the LO and Sense LO are handled if intending to use 4-wire connections.

Info about 2470-1100V Accessories

The male triax ends are mechanically compatible with the rear panel HV triax connectors on model 2470.
But they are also compatible with our more legacy triax such as the 237 related barrels, tees, 7078-TRX-x, CS-630, etc.
You may need some 237-TRX-BAR barrel connectors.

 

Okay, perfect, thanks! I'd much rather use the 2470 version since they've got the higher rating. Very short, so you're right we'll need barrel connectors which we have.

The wiring looks identical to the custom cable we had jury-rigged, apart from a guard on the HI Sense inner shield. The destination test fixture has the two guards on the HI Sense and Force cables shorted together, I'm thinking that shouldn't be a problem here (just a little bit extra for the HI Force guard to drive). ** Would you say it makes much difference to put an active guard on the HI Sense line or to leave it floating generally?

Thanks

Should Sense HI also be guarded?  Ideally, yes.

In concentric conductors like a triax cable, is easy to envision the minimization of leakage currents from the signal on center pin if the next layer inner shield is driven at same potential by the guard.  No delta V = no current.
This is one motivation for guarded cable especially for the Force HI.

But guarding has additional benefit of smaller effective RC time constant if the coupled capacitance between the layers does not have any charge up requirements.  This would be the reason to also guard the Sense HI line.
The input R of the Sense HI is typically > 10GΩ

For long cables, you might find some settling time benefit by guarding depending on the speed of your IV curves, size of dV steps, etc.