Q
What are the key points when designing RTD or TC circuit?
A
1. Very high Input impedance and low bias current are two basic requirements to
the signal conditioning circuit processing the micro signal from TC and RTC.
2. 50/60Hz noise needs to be filtered out by signal conditioning circuit or AD
converter.
The ∑-Δ ADC would be first choice when the sampling rate is not too high.
3. Every component through the signal path needs to be ultra-low leakage
especially for RTD measurement.
4. Pay attention to the self-heating of RTD and CJC of thermocouple.