Why is it normal to pressurize the automatic electronic sphygmomanometer twice?

Normal. The electronic sphygmomanometer continues to pressurize because the pressure is not enough to detect the pulse fluctuation. After the pause, there will be a second pressurization, no problem.

The working principle is to control the pressure applied to the measured part from the outside and judge the control result and the information of the appearance and disappearance of Coriolis sound. The former can continuously measure arteries and veins, while the latter can only measure systolic and diastolic pressures of arteries.

Extended data:

The mercury sphygmomanometer used by doctors in hospitals is only a tool for measuring pressure. It is one-sided to think that mercury sphygmomanometer is an accurate sphygmomanometer, because mercury sphygmomanometer is only a manometer, and the focus is on auscultation by doctors through stethoscopes. Mercury sphygmomanometer is generally prohibited in developed countries, but pressure gauges are used. However, due to the mechanical design principle of pressure gauge, it must be calibrated every three months.

Now the electronic sphygmomanometer has realized automatic intelligent measurement, and the measured data can be automatically transmitted to the health management platform through the network, and the generated health data will be reported back to the user. Because of the more advanced technology, the measurement results are more accurate than the traditional electronic sphygmomanometer.

It is normal for individual subjects to have differences between electronic sphygmomanometer and auscultation.

Baidu encyclopedia-electronic sphygmomanometer