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Transcript
Thermocouple Daughter Board All models will need a simple low noise, high gain amplifier Cold junction compensation 1. Hardware a. Apply canceling voltage at the cold junction b. Each thermocouple type will need a unique compensating circuit 2. Software a. Measure temp of the reference junction, and compute the equivalent thermocouple voltage using lookup tables. b. Measure the output voltage and add the reference junction voltage from a. c. Convert the resulting voltage to temperature using lookup tables (or polynomials) 3. Isothermal Block – forces the junction connections to be the same temperature All designs will need ADC Thermistor Daughter Board 1. Use a simple pull up resistor a. Depends on sensor and resistor accuracy b. Reference voltage is compared to thermistor curve c. Feed to op amp and then the ADC 2. Weatstone Bridge(one leg) a. Very precise b. Length between thermistor and bridge is not a limiting factor 3. Differential setup a. Two thermistors in a Weatstone bridge b. Simplifies Design c. Reduce number of components Load Cell Daughter Board
