The intervals of the automatic calibration have been carefully chosen following clinical studies. Therefore, independently choosing the intervals of physiocal is not desirable.
The reason for the short intervals in the beginning of the measurement can be found in that during the first minute the increased pressure on the finger compresses the tissue. This causes the interstitial fluids to shift, which in turn has an effect on the signal quality. When the algorithm detects a stabilization of the signal quality, and it is adequate enough, the interval between autocals is increased. When a stable measurement is ongoing, the interval will be 70 heart beats, which was found to be the maximum interval to be able to compensate for possible changes in finger artery compliance. During the measurement signal quality can change and intervals are adjusted up or downwards accordingly.
If the calibration is interfering with the measurement, it can be stopped altogether. Please be aware that this may reduce longterm tracking of blood pressure during the period that autocal is not active. Hence turning off autocal for long periods is not recommended.