From: "Michael A. Terrell"
Subject: Re: what is 100R mean in a schematics?
Date: Sat, 21 Dec 2002 11:17:11 -0500
Organization: Have you seen my bench? No, really! Where is it?
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Zefram Cochrane wrote:
> "William Meyer" wrote in message news:eOMM9.3025
> > They don't confuse it with another descriptor, but to many Americans
> (especially in my
> > generation or older), nanofarad is a term not often seen. Back in the tube
> days, pF
> > was referred to as micro-microFarad. Not sure why nano was so late to be
> recognized, but
> >I have often found people not recognizing it.
> This sounds unreal to me (not that I don't believe you). As I've said in
> other postings,
> I was "introduced" to Mega,Kilo,Centi,De[ck]a,Milli,Nano,Pico,Hecto etc all
> at the same time
> and had no idea that there was any difference in the time at which they were
> Do people in the US seldom say "nanometer" (for light wavelengths),
> "picoliter" (measuring inkjet drop resolution)
> Are you saying that US electronics magazines hardly ever refer to "nano" or
> "pico" or whatever ?
> I'll just go an have a look in Circuit Cellar... Yes, you appear to be
> correct; on the basis
> of a quick scan through the various circut diags, I can see references to
> (no "F") but no "nano".
> "nano","pico","femto","atto" etc aren't electronics-specific: they are the
> SI(?) multipliers for
> 1E-9, 1E-12, 1E-15, 1E-18. Even if I'd never seen the term "nanofarad", it
> would be immediately
> obvious to me what it meant (assuming I knew what a Farad was).
> I assume all this is due to the USAns' reluctance to use "metric"
> Richard [in WR14]
At one time nanofarad WAS used in the US but it seems to have faded
away, starting in the '60s. I used to see it on parts and schematics
when I was a kid, and once in a while when I did through old documents
it turns up. To me it is simpler to skip over it and just have two main
groups, pF and uF. I have no problem working with either system.
Michael A. Terrell