[AR] Re: Best Practices for Measuring Engine Temps with a Thermocouple
- From: "David W. Schultz" <david.schultz@xxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Fri, 18 Oct 2013 21:58:55 -0500
On 10/18/2013 09:08 PM, Norman Yarvin wrote:
> Nevertheless, that voltage source doesn't have infinite ability to
> source current; it's not quite _that_ magical. And if you have a
> situation where two nominal "voltage sources" are fighting each other
> (as you would if you had one junction near the inner wall and one near
> the outer), their relative ability to source current is what
> determines the resulting voltage (and thus the measured temperature).
>
The junctions do not source the current. The current is the result of
heat flow in the conductor. You get a voltage output because the
thermocouple wires have slightly different properties and generate
slightly different voltages.
--
David W. Schultz
http://home.earthlink.net/~david.schultz
Returned for Regrooving
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