The SI Brochure, NIST SP 330, NIST SP 811 and other documents are among
those that the joint committee refers to in maintaining SI 10. We are
sensitive to changes in those documents. For example, the katal and the
dalton will certainly be part of this revision.
One large change in the SI Brochure was the new chapter relating to the
quantity calculus. I have seen very little conversation on this list
regarding that.
As a side issue, but one that is relevant, it might interest USMA
members and list members to hear that we are working on a new IEEE
standard paralleling the new ISO/IEC 80000 series (replacing the ISO 31
series) on standard quantities. This is an agenda item for next
Thursday's SCC 14 meeting. I plan to submit an article soon to Metric
Today on this topic. Do be sure to keep your membership in USMA up to
date so that you will see that article, if they publish it. Details on
the new SI 10 will be submitted for publication in Metric Today, as well.
Jim
John M. Steele wrote:
I'm not on the committee. As a minimum, some changes that need to be
reflected:
*The katal is approved as a new derived unit.
*The dalton is accepted as equivalent to the unified atomic mass unit
*The SI Brochure has taken a softer stance on certain non-SI units.
*NIST has continued the acceptance of certain metric, but not SI,
ionizing radiation units for the US. The prior edition of SP330 had set
a deadline of 2000. (I'm not sure I agree with it, but Congress charges
them to write the rules for the US).
*There were some editorial style changes that perhaps need to be reflected.
Those changes in driving documents need to be reflected. Since I don't
have a copy and am not on the committee, I have no idea what else.
--- On *Sat, 4/18/09, Jeremiah MacGregor
/<jeremiahmacgre...@rocketmail.com>/* wrote:
From: Jeremiah MacGregor <jeremiahmacgre...@rocketmail.com>
Subject: [USMA:44736] Re: IEEE/ASTM SI-10
To: "U.S. Metric Association" <usma@colostate.edu>
Date: Saturday, April 18, 2009, 9:49 AM
I'm curious as to what is needed to be revised or updated. Unless
there is a new unit or prefix added to the list of units or the
definition of a unit changes then there should be no need to revise
or update the SI standard. So what revisions are being made?
Jerry
------------------------------------------------------------------------
*From:* John M. Steele <jmsteele9...@sbcglobal.net>
*To:* U.S. Metric Association <usma@colostate.edu>
*Sent:* Saturday, April 18, 2009 7:57:00 AM
*Subject:* [USMA:44732] Re: IEEE/ASTM SI-10
I don't own a current copy and don't see a need for one. The SI
Brochure, and NIST SP330 and SP811 suffice for my purposes and
heavily overlap the content.
However, I had a copy in the early 70's. I was helping the
electronics company I worked for then go metric, in addition to my
regular engineering duties. As I recall, it had some information
helpful to organizations transitioning from Customary or dual to
metric, particularly on rounding.
(Rounding nominal or target values is pretty straightforward;
rounding minimum and maximums from specs requires either rounding
"specward" or some engineering judgementor both.)
I don't feel it is needed in organizations that ARE metric, but that
is a personal opinion and others may feel differently. Also, it is
(at least partially) out of date whenever a new edition of the SI
Brochure comes out. It takes time for the NIST and ANSI
publications to catch up.
(although revisions from 7th to 8th SI Brochure are not earthshaking)
--- On *Fri, 4/17/09, Jeremiah MacGregor
/<jeremiahmacgre...@rocketmail.com>/* wrote:
From: Jeremiah MacGregor <jeremiahmacgre...@rocketmail.com>
Subject: [USMA:44717] Re: IEEE/ASTM SI-10
To: "U.S. Metric Association" <usma@colostate.edu>
Date: Friday, April 17, 2009, 10:04 PM
Why pay for a publication from the ANSI when the same
information is available for free from the BIPM.
http://www.bipm.org/en/si/
Jerry
------------------------------------------------------------------------
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James R. Frysinger
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