[volt-nuts] plastic caps on 3458A reference board

[Charles Steinmetz]

>I'd think a couple of pieces of pink (non-conductive) closed cell 
>antistatic foam, one hollowed out a bit with a penknife, would work 
>well. It would both shield from airflow and provide insulation.

The problem is that an LTZ1000 (or LM399) runs hot enough that most 
plastics you find lying around won't stand up to it for very long 
(some of them melt almost immediately when you power it up).  This is 
true even of polycarbonate, which is one of the most durable common 
plastics, and is why the original caps were made from polysulfone.

Unfortunately, it also means that replacements may be hard to make by 
3D "printing," since the process depends on melting the base material.

Best regards,

Charles