Could you please explain about temperature measurement range when using thermocouple at AD7792?
Channel 1 is used for sensing but it cannot measure the data below -25℃. (The data is normally measured above -25℃.)
Please give the information on what can influence on the measurement of low temperature and what should be checked for improvement.
The temperature range will be dependent on the type of thermocouple used. Below is a reference circuit for Thermocouple Measurement System using AD7124 which is also a sigma delta ADC. It covers a temperature measurements from -50C to 200C. It uses a T-type thermocouple wherein the output voltage is in the range of −8 mV to +17.2 mV, which represents a temperature range of −200°C to +400°C. You can use this circuit note as your reference and can modify based on your required temperature range and operating voltage range of AD7792.
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