Electronics > Beginners
Modern way to specify values on schematics
ebastler:
--- Quote from: bsfeechannel on March 04, 2019, 04:58:41 am ---I prefer 0R47, 100, 1k, 2k2, etc. for resistors, 2p2, 330p, 4n7, 68n, 2µ2, 10µ, 3300µ for capacitors, and 150n, 2µ2, 330µ, 15m, 10H for inductors.
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The "10H" is the odd one out in that list. Any particular reason why you include the unit there, and only there?
AndyC_772:
I think the inconsistency there is that "100" (resistance) has no unit; I'd use 100R.
Zero999:
--- Quote from: Wimberleytech on March 05, 2019, 01:19:58 am ---I am a Texan (Remember the Alamo!), so it pains me to say this...Europeans got it right with the metric system and with the comma. It is the right thing to do. :phew:
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I agree about the metric system but using commas vs full stops for decimal places seems arbitrary. In the UK we use the . for the decimal place and , for the separator, which only looks right to me because it's what I'm accustomed to. I think the . or , is fine for the decimal place but to avoid confusion only the space or ' should be used for the separator.
--- Quote from: MarkF on March 03, 2019, 06:59:19 pm ---And do not use 'm' for micro. I use 'm' for milli and 'u' for micro.
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I tend to avoid using milli farads for that reason, so 1mF should be written as 1000µ. For larger values it starts for make sense to use farads, so 10 000µF becomes 0.01F, which in theory could be 0F01, but that would confuse lots of people.
jpanhalt:
Interesting how so many feel they are using the SI system, often called the metric system, but don't follow its rules.
Source: https://www.nist.gov/pml/weights-and-measures/writing-metric-units
Rule(Spacing):
"A space is used between the number and the symbol to which it refers. For example: 7 m, 31.4 kg, 37 °C."
In any event, as for schematics or any published work, it is far more productive just to get the "Instructions for Authors" and follow them than to try to argue with an editor.
Such cultural things as 9R1 versus 1n0 seem inconsistent, but common.
ebastler:
--- Quote from: jpanhalt on March 05, 2019, 10:41:22 am ---Interesting how so many feel they are using the SI system, often called the metric system, but don't follow its rules.
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You are confusing the SI system of units with the typesetting rules for writing numbers and (whichever) units.
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