> > > You can use your electronic skill set. R=3D rho * L/A > > > works for thermal resistance as well as electrical > > > resistance. > > > >But, radiation and convection may be significant contributors > >depending on a number of factors which may be poorly understood or > >controlled here. > > I think they can be ignored for the purpose of getting an estimate of the > effect of the T/C under the presumed conditions (< 100=B0C). Wow. Lots to digest in that firehose of concepts. I think, though, that this may be a worse problem than I can tackle as quickly as I need to. So, I think I MAY try using multiple thermocouples as a means of comparing apples to apples. Russell's idea of heating the thermocouple is a lovely one; however, given the difficulty of getting these things on the leads to begin with (and the fact that all of this is (and should be for best results) sealed up inside a very tight package, I don't think rapidly moving anything from a heat source to the diode lead is an option. Mike H. -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist