[Diy_efi] Newbie with a simplified Motronic project
josh lane
jlane at dtgnet.com
Mon Nov 4 18:37:49 GMT 2002
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umm I believe gold is as stable as it gets?
----- Original Message -----=20
From: Bevan Weiss=20
To: diy_efi at diy-efi.org=20
Sent: Sunday, November 03, 2002 2:05 PM
Subject: Re: [Diy_efi] Newbie with a simplified Motronic project
----- Original Message -----
From: "Adam Wade" <espresso_doppio at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Sunday, November 03, 2002 4:34 PM
Subject: Re: [Diy_efi] Newbie with a simplified Motronic project
> --- Eric D Byrd <klox at juno.com> wrote:
>
> > Every electrical component ever manufactured
> > eventually -- eventually -- experiences changes in
> > its operating characteristics due to age, especially
> > if heat is involved, and more especially if extreme
> > variation of temperature is involved.
>
> True, except this isn't a sensor in the traditional
> sense. It's simply a resistive wire, and if that
> changes its resistance vs. temperature profile, then
> we'll have to rewrite physics! :D
>
> If there is a solid-state temperature sensor involved,
> then there's definitely more of a reason to worry
> about calibration changing, however.
Any time you want precision comparison (or measurement) you should be
worried about the comparison (or measurement) device changing value. =
How
accurately you want to measure corresponds to how much you should =
worry...
> > And you are right, physics does not go out of
> > calibration. The trouble is, the devices we build
> > often don't account for physical effects that seem
> > irrelevant, or that we don't know about.
>
> Therein lies the learning curve. ;) Many of these
> manufacturers (Bosch especially) have been doing this
> for eons, just about, and they don't tend to get
> surprised too often. ;)
>
> > It's a mistake to assume a device will never
> > experience variations in its response, from
> > physical effects we haven't accounted for.
>
> Again, it would be a pretty spectacular upheaval of
> the laws of physics if a stable metal changed its
> resistive characteristics over time, AFAIK. ;)
What's a stable metal???
Certainly none that I know of.
Iron reacts with oxygen to give various IronOxides.
Aluminium reacts with oxygen to give AluminiumOxide
Copper easily tarnishes, and reacts with oxygen, chlorine, bromine, =
pretty
mcuh anything
Sodium can jetboat around on water, before bursting into flame.
I'm not sure of where you can obtain a stable metal.
> > It's worthwhile to educate, and be educated. But I
> > have better things to do with my time, than trade
> > verbal abuse.
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<DIV><FONT face=3DArial size=3D2>umm I believe gold is as stable as it=20
gets?</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dkaizen__ at hotmail.com =
href=3D"mailto:kaizen__ at hotmail.com">Bevan=20
Weiss</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Ddiy_efi at diy-efi.org=20
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, November 03, 2002 =
2:05=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [Diy_efi] Newbie =
with a=20
simplified Motronic project</DIV>
<DIV><BR></DIV><BR>----- Original Message -----<BR>From: "Adam Wade" =
<<A=20
=
href=3D"mailto:espresso_doppio at yahoo.com">espresso_doppio at yahoo.com</A>&g=
t;<BR>To:=20
<<A =
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A>><BR>Sent: =
Sunday, November 03, 2002 4:34 PM<BR>Subject: Re: [Diy_efi] Newbie =
with a=20
simplified Motronic project<BR><BR><BR>> --- Eric D Byrd <<A=20
href=3D"mailto:klox at juno.com">klox at juno.com</A>> =
wrote:<BR>><BR>> >=20
Every electrical component ever manufactured<BR>> > eventually =
--=20
eventually -- experiences changes in<BR>> > its operating=20
characteristics due to age, especially<BR>> > if heat is =
involved, and=20
more especially if extreme<BR>> > variation of temperature is=20
involved.<BR>><BR>> True, except this isn't a sensor in the=20
traditional<BR>> sense. It's simply a resistive wire, and if=20
that<BR>> changes its resistance vs. temperature profile, =
then<BR>>=20
we'll have to rewrite physics! :D<BR>><BR>> If there is a=20
solid-state temperature sensor involved,<BR>> then there's =
definitely more=20
of a reason to worry<BR>> about calibration changing, =
however.<BR>Any time=20
you want precision comparison (or measurement) you should =
be<BR>worried about=20
the comparison (or measurement) device changing value. =
How<BR>accurately=20
you want to measure corresponds to how much you should=20
worry...<BR><BR><BR>> > And you are right, physics does not go =
out=20
of<BR>> > calibration. The trouble is, the devices we=20
build<BR>> > often don't account for physical effects that =
seem<BR>>=20
> irrelevant, or that we don't know about.<BR>><BR>> Therein =
lies the=20
learning curve. ;) Many of these<BR>> manufacturers =
(Bosch=20
especially) have been doing this<BR>> for eons, just about, and =
they don't=20
tend to get<BR>> surprised too often. ;)<BR>><BR>> > =
It's a=20
mistake to assume a device will never<BR>> > experience =
variations in=20
its response, from<BR>> > physical effects we haven't accounted=20
for.<BR>><BR>> Again, it would be a pretty spectacular upheaval=20
of<BR>> the laws of physics if a stable metal changed its<BR>> =
resistive=20
characteristics over time, AFAIK. ;)<BR><BR>What's a stable=20
metal???<BR>Certainly none that I know of.<BR>Iron reacts with oxygen =
to give=20
various IronOxides.<BR>Aluminium reacts with oxygen to give=20
AluminiumOxide<BR>Copper easily tarnishes, and reacts with oxygen, =
chlorine,=20
bromine, pretty<BR>mcuh anything<BR>Sodium can jetboat around on =
water, before=20
bursting into flame.<BR><BR>I'm not sure of where you can obtain a =
stable=20
metal.<BR><BR><BR>> > It's worthwhile to educate, and be =
educated. =20
But I<BR>> > have better things to do with my time, than =
trade<BR>>=20
> verbal=20
=
abuse.<BR><BR>_______________________________________________<BR>Diy_efi =
mailing list<BR><A=20
href=3D"mailto:Diy_efi at diy-efi.org">Diy_efi at diy-efi.org</A><BR><A=20
=
href=3D"http://www.diy-efi.org/mailman/listinfo/diy_efi">http://www.diy-e=
fi.org/mailman/listinfo/diy_efi</A><BR></BLOCKQUOTE></BODY></HTML>
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