On 04/06/2020 03:36 PM, John Dammeyer wrote:
I have a Raspberry PiZeroW reporting this:
T=15.6C,RH=55.0%,DP=6.6C And yet I've had more surface
rust on everything this year than over the last 10. Go
figure. There shouldn't be any moisture condensing on
anything with a dew point at 6.6C. And yet... John
No, the tin problem does NOT require condensing levels of
humidity. RH 55% is bad enough.
And, it probably is just like that in my basement sometimes,
too. Some tin-plated connectors have enough
contact pressure to hold this issue at bay, some don't. I
have real Phoenix Contact connectors on
my PPMC boards, and I still had the one that supplies power
to the PPMC motherboard get a high resistance contact some
years ago. The PPMC kept working fine at 4 V, but the
encoders started dropping counts. It took me a long time to
discover that one. it was so subtle, but parts were coming
out the wrong size (too big).
Rust on steel definitely doesn't require condensing, either.
Jon
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