From: muratlanne@gmail.com   
      
   "Charlie+"  wrote in message   
   news:89k19jlledmumfehiklp9jbvmhjumukecm@4ax.com...   
      
   On Thu, 11 Jul 2024 21:45:08 -0400, "Jim Wilkins"    
   wrote as underneath : ...   
      
   Have you a fin painted (HT) matt black to measure on? Otherwise your   
   reading with IR maybe low if looking straight at Al?  Running rich will   
   help cool it down a little .. Sorry no experience here on actual running   
   temps!  C+   
      
   ---------------------------   
      
   I also have thermocouples and a thermal imager. Generally on a heatsink the   
   imager shows a temperature spread greater than the error from not adjusting   
   for emissivity, I've left it at the default 0.98 on the IR thermometer and   
   drill a small hole for a K thermocouple at the indicated hottest spot in the   
   rare case that I need more accuracy. Typically the place damage will occur   
   is hidden internally anyway, so comparing IR readings to known values for   
   similar conditions has to be enough. On power semiconductors a base-emitter   
   or other diode voltage drop at or corrected to minimal current is a good   
   indication of actual internal device temperature.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)