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INA148: CMRR during run-time

Hi,

the CMRR is min. 70dB, the typical value is 86dB. The customer is doing calculation for the system and is measuring the exact CMRR for the devices. Is this measured CMRR constant during the run-time of 10 years. Or is this a constant value means the measured CMRR (e.g. 80dB) is constant?

BR & thanks a lot, Xaver