Random comments on common errors in technical documents - Page 13 - diyAudio
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Old 19th July 2012, 08:50 AM   #121
Shaun is offline Shaun  South Africa
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Saying "high tolerance" when the opposite is meant.
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Old 19th July 2012, 11:48 AM   #122
DF96 is offline DF96  England
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Is a 'high load' a high resistance or a low resistance?
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Old 19th July 2012, 12:22 PM   #123
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Quote:
Originally Posted by ratza View Post
What about a PSU filter consisting in three 10kuF capacitors?
Is it hard to write 10mF or 10,000uF?
Folks don't use "mF" since the old guys like me remember when it stood for mike -- the Greek mu wasn't used probably owing to it not being in the usual typesetter's bin of letters. A 365pF variable cap for an a.m. receiver would be referred to as 365mmF -- i think it started to change sometime in the early 1960's.

Not that folks didn't understand "milli" from Latin, most high school students on an academic track took it up until the 1960's.
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Old 19th July 2012, 12:50 PM   #124
DF96 is offline DF96  England
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I thought people used mfd not mF? Of course some now use mf so we don't know if they are being old-fashioned and mean mfd but can't find the d key, or being modern and mean mF but can't find the shift key.
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Old 19th July 2012, 12:53 PM   #125
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Default In Spanish too

Formerly, here in Argentina, some old magazines and books referred the Kohms a mohms, since in Spanish 1000 is "mil", soy they wrote "22mohms" as "22 mil ohms", or 22 thousand of ohms, and confusing with Mohms, or megaohms.

And "pf" was "µµF", or "nf" was "KpF".
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Old 19th July 2012, 12:55 PM   #126
ratza is offline ratza  Romania
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jackinnj, at least the things are clearer (or more clear?) for me, now.
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Old 19th July 2012, 01:09 PM   #127
DF96 is offline DF96  England
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For many years the British Royal Navy measured capacitance in jars (roughly 1nF). They only switched to farads somewhere around the 1940s, long after everyone else had switched. Probably because our navy are the most conservative part of the most conservative part (the military) of any nation. I guess the jar is a useful size of measure for long wave circuits in a spark transmitter.
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Old 19th July 2012, 01:13 PM   #128
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Quote:
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For many years the British Royal Navy measured capacitance in jars (roughly 1nF). They only switched to farads somewhere around the 1940s, long after everyone else had switched. Probably because our navy are the most conservative part of the most conservative part (the military) of any nation. I guess the jar is a useful size of measure for long wave circuits in a spark transmitter.
May be that they was using as unit a Leyden Jar???
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Old 19th July 2012, 01:30 PM   #129
DF96 is offline DF96  England
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That is the origin of the name. Perhaps there was a standard size jar? Strangely, we never took to measuring jam or other preserves in jars - it was always pounds and then grams.
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Old 19th July 2012, 01:41 PM   #130
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When I was in the second year of the UTN (Universidad Tecnológica Nacional, a public university in Argentina), in the Physics II laboratory, the guys there invented a strange time measuring unit they called "Tic" (That hasn't direct conversion with any "normal or standard time measuring unit). In the partial and or final exams, if you use the standard second, you was automatically disapproved (sorry if this is not the wright meaning).
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