[sdiy] how to tell metal film resistors?

[Roman Sowa]

You may try to estimate the tempco.
Put the resistor in refridgerator for couple of minutes (assuming 
there's about +5 .. +10 deg.C), then measure resistance. Then hold it in 
your hand for some time to heat up to body temperature and mesure again.
Metal film should show about 0.3% difference, while carbon one about 
1.5% or more.

Roman

W dniu 2015-04-26 o 16:35, Michael Zacherl pisze:
> Hi, it's a basic question, but actually, I don't know the answer:
> Say I grab an arbitrary resistor from the mixed parts bin, how can I tell if its carbon or metal film?
> Or I get resistors from ebay, and want to verify that all is good as ordered?
> Thanks, m.
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