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ha scritto:

wrote:

Hello all,

this might be a bit off topic, however is there a (easy or not) way to
tell the working voltage of a ceramic disc capacitor? I have tons of
these surplus or saved capacitors but often the working voltage is
marked when equal or higher than 1 kV. When I have to reuse a capacitor
in a high but not so high voltage circuit (let's say 200 Vdc) I never
know how to find the correct size or how to measure the insulation
voltage of the capacitor.
Fortunately film capacitor have a clear marking :-)
Best regards

Francesco IS0FKQ

my first q is to check that youre familiar with the voltage codes used
on ceramics. V rating is indicated by one letter or number. If so, and

I'm not sure about these codes, often on ceramics I see only 3 numbers
and one letter and I assume the one letter is the tolerance code (M, Z
often).
Other have someting like 103P with an E on top and 82 lower in the
disc.
Others have YY on top and usual capacity code on a lower line.
In short the answer is no, I haven't been able to find good references
about all markings, so if anyone has good sources for learning these
codes please share them!
As for the destructive test, yes, it's an option, so if other else
fails, I'll test them this way.

Thanks!

Francesco IS0FKQ