On the subject of precision converters, how about 24-27 bit mass-to-digital
converters? I have a Mettler AT21 balance that resolves a 20 gram weight to 1
microgram. Also a Mettler mass comparator that does 100 grams to a microgram.
I also did some work on a balance that (theoretically) measured up to a gram
with nanogram resolution (30 bit mass/digital conversion). At that level it
gets hard to separate wishful thinking from reality...
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