[volt-nuts] PCBs with ceramic substrates

[David]

FR4 has problems with consistency.  Samples can have problems with
hook, dielectric absorption, leakage, and sensitivity to humidity.

On Sun, 16 Apr 2017 12:08:07 +0100, you wrote:

>Hi Chuck
>
>But the context is "PCBs with ceramic substrates". Are any of *those*
>tough? They may well be, perhaps you know of some? It does not help us
>with the subject much if there are ceramics with these amazing
>properties if they are not available as PCBs.
>
>There is also the question of exactly what properties of FR4 are
>limiting for "metrology" use.
>
>John