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???
10/14/10 09:27
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 		 #179099 - Still not trivial
Responding to: ???'s previous message
Steve M. Taylor said:
Then you run the constant current source through the thermistor and a reference resistor which generates Vref for the ADC

Just remember that most ADC prefers the reference voltage to be relative GND, while it is preferable to have the thermistor also connected to GND, so a solution with reference resistor in series with the thermistor is still not trivial.

List of 24 messages in thread
TopicAuthorDate
Measure temperature @0.1deg resolution using thermistor            01/01/70 00:00      
   Sorry - doesn't work            01/01/70 00:00      
      Thermistors aren't such bad...            01/01/70 00:00      
         Remember the original requirement of 0.1°C            01/01/70 00:00      
   Resolution is not there...            01/01/70 00:00      
      What about the Termistor            01/01/70 00:00      
      RE: Resolution is not there...            01/01/70 00:00      
         one-wire sensors are still quite expensive than thermistors            01/01/70 00:00      
            Thermistor Vs one-wire sensor cost            01/01/70 00:00      
               Your processor has a voltage reference good enough?            01/01/70 00:00      
                  Voltage reference            01/01/70 00:00      
                     That voltage reference has large error...            01/01/70 00:00      
                  Vref is Not Needed            01/01/70 00:00      
                     Depends            01/01/70 00:00      
                        Ah but,            01/01/70 00:00      
                           Still not trivial            01/01/70 00:00      
         The normal fluke doesn't give 0.1C correct readings            01/01/70 00:00      
         I think your customer ...            01/01/70 00:00      
            quite common problem with resolution/precision            01/01/70 00:00      
         linearing only solves one issue            01/01/70 00:00      
            Precision            01/01/70 00:00      
               hm            01/01/70 00:00      
               Not an opamp            01/01/70 00:00      
               Comparison with Fluke a big problem            01/01/70 00:00      

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