Date: Thu, 19 Dec 2002 18:55:39 +0100
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.1) Gecko/20020826
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Subject: Re: what is 100R mean in a schematics?
Organization: Club-Internet / T-Online France
NNTP-Posting-Date: 19 Dec 2002 17:54:24 GMT
> This seems to be becoming more common.
> In schematics from European vendors I have seen things like 4k7 meaning 4.7
> kohms, for instance.
I think this is actually the current standard ;)
To avoid potential errors due to the sometimes not-so-clear decimal
point, it is avoided altogether, and replaced with the multiplier suffix:
4.7k --> 4k7
0.1 --> 0R1
1.5M --> 1M5
100 --> 100 (or 100R)
This is good practice, besides being standard.
A friend of mine, who works in a PCB manufacturing joint, told me that
they once made a mistake on the values of some resistors due to the fact
that the client had given them the schematics in PDF format, and the
decimal points were actually not showing up, probably because of the
font that was used. I was shocked, I asked him "how come they don't give
you all the components values in a separate text-only file to minimize
potential reading errors?", and he told me that it was unfortunately
common practice to get all sorts of documents formats from the clients,
and what can you say, the client is "king".