[time-nuts] capacitors for oven controller
csteinmetz at yandex.com
Mon Sep 22 16:23:21 EDT 2014
>I'm working to replicate an oven controller and the schematic I have
>states to check the leakage resistance of the .01uf integration capacitor
>at 50 degrees C.
> * * *
>What would be considered good at that temperature and how would I measure
If you CAN measure it, without extraordinary measures, it is probably
not suitable. Some bench DVMs (e.g., Fluke 8050A) have conductance
ranges that measure very low conductances (high resistances).
>Also what type capacitor to use? Polycarbonate???
Polycarbonate is very difficult to find these days. Of today's
common dielectrics, it's a split decision between PP (polypropylene)
and PPS (polyphenylene sulfide). PPS handles higher temperatures,
but PP has better insulation resistance at elevated
temperatures. Another possibility would be PTFE, if one will
physically fit. Finally, a C0G (NP0) ceramic could be a good choice.
More information about the time-nuts