Article View: sci.electronics
Article #1292Re: Rational Capacitor Prefixes
From: Roy Smith
Date: Wed, 23 Aug 1989 20:20
Date: Wed, 23 Aug 1989 20:20
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1695 bytes
In article <26043@quacky.mips.COM> vaso@mips.COM (Vaso Bovan) writes:
> In conformance with good S.I. practice, the "nanofarad" is coming into wide
> usage. (European schematics have long used nanofarads).
I remember once seing a (hand-drawn) schematic with a 10 nF cap on
it. I was so convinced it was a mistake I tracked down the engineer who
drew it, had him dig out his copies, and confirm that, yes indeed, he meant
nanofarads. That was, I think, about 7-8 years ago, and no, it wasn't a
european design. But I do agree that nF should be a perfectly reasonable
unit and should be in general use. Same goes for mF for milifarads. I
will object, however, to centifarads and decifarads.
> Those who balk at nanofarads should consider it wasn't long ago that
> "puffs" were given as uuF, eg 47uuF.
Not to mention the even older MF and MMF for microfarads and
micromicrofarads. BTW, is there any standardized rule which says u is for
micro. The correct prefix is the greek mu, but since that's not an ascii
character, everybody uses the latin u, which looks similar.
--
Roy Smith, Public Health Research Institute
455 First Avenue, New York, NY 10016
{att,philabs,cmcl2,rutgers,hombre}!phri!roy -or- roy@alanine.phri.nyu.edu
"The connector is the network"
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!watmath!iuvax!rutgers!cmcl2!phri!roy From: roy@phri.UUCP (Roy Smith) Newsgroups: sci.electronics Subject: Re: Rational Capacitor Prefixes Keywords: nF, cap value prefixes Message-ID: <3951@phri.UUCP> Date: 23 Aug 89 20:20:55 GMT References: <26043@quacky.mips.COM> Reply-To: roy@phri.UUCP (Roy Smith) Organization: Public Health Research Inst. (NY, NY) Lines: 24