From: muratlanne@gmail.com   
      
   "Bob La Londe"  wrote in message news:v2djrv$3hfus$1@dont-email.me...   
      
   On 5/18/2024 7:33 PM, Jim Wilkins wrote:   
   ...   
      
   I never was employed doing destructive testing, but I did spend a decade   
   or two doing low voltage communication contracting.  I learned there is   
   what they say, and there is what there is.  Usually what they say fell   
   short in my field, but sometimes it didn't.   
      
   When they say an IR motion sensor will detect motion at 90 feet they   
   mean if ambient is below 70F and the subject is large and is running a   
   fever.  LOL.  They don't say if ambient is 90+ its virtually worthless.   
      
   ---------------------   
   Most of the testing was to find and reject or reclassify parts that didn't   
   meet specifications for companies that cared, or burn-in testing to weed out   
   early failures by operating at elevated temperature for a week. The exact   
   conditions were usually secret, I had to provide a range of adjustment.   
   Sometimes there had to be provision for destructive failure, such as   
   Chrysler Lean Burn engine controllers with components not rated for possible   
   under-hood temperatures.   
      
   Before Congress mandated emissions and fuel economy standards that needed   
   electronic control to meet, the only electronic device in a car was the   
   radio which the auto makers bought, they had to hire new engineers   
   unfamiliar with the heat, water, dirt, salt and vibration, who took time to   
   learn. I had the partial advantages of military electronic experience which   
   solves those, in commercially unaffordable ways, plus a hands-on   
   apprenticeship in custom electro-mechanical machine design. The engine   
   compartment environment can be nearly as challenging as military aircraft   
   specs, consider a snow plow driver in Alaska starting cold and diving full   
   throttle into the deep snow in front of the truck, or splashing through an   
   icy puddle.   
      
   Heat in the South is another issue that's not so evident in Michigan. I know   
   what Atlanta is like in summer.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)