This diagram shows the basic components inside a modern temperature controller or meter. The temperature is converted to a voltage by the thermocouple. The voltage is amplified and then passed to the CPU. The CPU also acquires the temperature of the thermal block. With these two pieces of information the CPU can calculate the true temperature being read by the thermocouple. Based on this value it can display it, output an analog signal depicting that temperature in some scaled value and handle the control of some component to manipulate the process that the temperature is monitoring
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