26 May
2012
26 May
'12
6:23 p.m.
A femtoamp is only several thousand electrons per
second (between 6241
and 6242, if the values I have at hand are correct). Isn't that, like,
the leakage current through an air gap?
Wow!
Femtoamps times gigaohms equals...microvolts. The
noise shielding in
that device must be impressive.
I only believed it because I saw with my own eyes. The circuit is built
on top of teflon insulators, the fiberglass board has no enough insulation
for this kind of amp. I wasn't able to take photos (is a trade secret of one
of my clients) but I was very impressed nonethless for the building quality
and the values of parts.
It is very funny to see a resistor encased on a glass tube :oD These are
things I never imagined seeing :oD
Things I never saw in my life [...]
Me
neither. I think the largest resistor I've ever seen had a blue
third band (and, IIRC, brown and black for the first two - 10 megs).