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Thermocouple comp

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Robin Clark 2011-03-11 09:36:51 +00:00
parent a5dc8ccf13
commit dc5562d3c0
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fmmd_design_aide/fmmd_design_aide.tex
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@ -569,4 +569,15 @@ DAH. The circuit is arguably safer now
but statistically less reliable.
\paragraph{Practical side effect of checking for thermocouple disconnection}
Because the potential divider provides an offset as a side effect of detecting a disconnection
resistance in the thermocopule extension or compensation cable will have an effect.
For a `k' type thermocouple this would be of the order of $5 { }^{o}C$ for $100\Omega$ of
cable loop impedance. Therefore, accuracy constraints and cable impedance should be considered
to determine specified maximum compensation/extension lengths.
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