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???
10/26/06 22:59
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#127021 - tradeoffs
Responding to: ???'s previous message

The CJC is to compensate for the extra thermocouple that gets formed where you connect the 'real' thermocouple wires to something different. So you measure this 'cold junction' and subtract the small offset that it creates.

As for having eight thermocouples - this is fairly common these days as most injection systems have per cylinder trim for spark and fueling. If it is a drag engine, the twist of the crank and camshaft causes big differences in the running of the cylinders, so EGT is used to quantify this and they have some means of compensating for it.


List of 19 messages in thread
TopicAuthorDate
Anyone know of 0v - +15v IIC ADC?            01/01/70 00:00      
   an op amp will do nicely            01/01/70 00:00      
      how so?            01/01/70 00:00      
         Two temp sensors enough?            01/01/70 00:00      
            probably            01/01/70 00:00      
               Link            01/01/70 00:00      
                  interesting            01/01/70 00:00      
   Tradeoffs            01/01/70 00:00      
      re: tradeoffs            01/01/70 00:00      
         tradeoffs            01/01/70 00:00      
            Where would you mount them?            01/01/70 00:00      
               Where are they mounted            01/01/70 00:00      
                  Thanks            01/01/70 00:00      
            Is that True            01/01/70 00:00      
               Three thermocouples, actually            01/01/70 00:00      
         final solution?            01/01/70 00:00      
            Take care!            01/01/70 00:00      
               good catch!            01/01/70 00:00      
                  Curing caps...            01/01/70 00:00      

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