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From:	John Doty <jpd AT noqsi DOT com>
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Date:	Mon, 19 Nov 2012 09:10:54 -0700
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On Nov 19, 2012, at 7:57 AM, Karl Hammar wrote:

>> On Nov 19, 2012, at 6:50 AM, Evan Foss wrote:
>>> Oh when I used Omega on resistors the old ones would fail. SDB might
>>> have fixed it but there was some reason that I can not remember for
>>> not using it.
> 
>> How should "mΩ" be translated?
> 
> milli Ohm.

SPICE won't understand that (can't have that space). In SPICE, either "m" or "M" is "milli". The actual unit is a comment, so SPICE will accept 1000MHz as the value of a one ohm resistor. But Unicode is troublesome in a format based on Hollerith encoding ;-).

> 
>> What about "MΩ"?
> 
> mega Ohm.

That would be "meg" in SPICE. The challenge here is to avoid translating "M" spuriously.

> 
> Some people write KΩ, and what is a Kelvin Ohm ?

It's wrong. Some people write mHz for megahertz, that's wrong too. I'm sometimes a pulsar astronomer, so I actually use mHz for millihertz.

> Don't do that is the answer.
> 
>> Should "m" by itself represent "meter" (SI) or "0.001" (SPICE).
> 
> m by itself is just a lone m, ask the author what he means by it.
> A number plus m as in 10 m is 10 meter.
> If spice treat 10m as 0.01, I would call that a local anomaly.

We're talking about SPICE netlisting here, and under what circumstances (if any) the netlister should attempt to translate standard SI notation into its SPICE equivalent. Asking the author is not a practical option in an automated process.

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com

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