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Hi Morgan,
Can you clarify the HW platform you are using for these measurements? HDC1080 EVM or your own board?
What could happen as time of operation increases could be two things:
1. Self heating of the HDC1080 device. This could happen is the sampling rate is high, if that is the case change it to 1Hz.
2. Not enough thermal isolation from other "hot" components placed close to the HDC1080 device. The EVM has this problem and that is why we recommend to separate the breakout section until a new rev is released in the near future.Please find slide below: