The specific principle is that the scale body sends out a weak current through the electrode plate, forming a closed loop with the human body. Through the principle that muscle is easy to conduct electricity and fat is not, an electrical impedance value is obtained, and then the body fat rate is calculated by combining the data such as height and weight.
The human body is like a parallel resistor, and the resistance value of each part is different, while the body fat scale is like a multimeter, connected at both ends of circuits A and B, so that the resistance value can be directly read from the meter, and then the problem can be solved by using the resistance value according to the physical formula and other known conditions.
One is the measurement part, and the measurement of body fat scale is to measure the resistance of human body through electrode sheet/conductive film; The other is the calculation part, and the calculation is estimated by the built-in model algorithm.
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Distinguish between good and bad body fat scales;
1. Be sure to buy an AC body fat scale instead of a DC body fat scale. Because only alternating current can measure the real human impedance, while direct current measures the human cortical resistance.
The number of electrodes is very important. The more electrode plates, the more accurate the measurement results, that is, the more accurate the instrument measurement results of 8 tactile electrodes. Fitness equipment generally has only six or four electrodes, but as for the two electrodes, forget it.
2, measured in different postures, if the measured results are the same, this body fat scale is likely to be fake. For example, when the feet stand apart, the measurement results are definitely different from those when the feet are measured at the same time.
The biggest culprit affecting the results of the body fat scale is the change of exercise and water in the body, so don't do strenuous exercise before measurement, and don't take measurements after eating, drinking and bathing in large quantities.
The suitable measurement time periods are 1 hour after getting up, 1 hour before going to bed and 1 hour after three meals. But you can also combine your own habits to measure, pay attention to each measurement at the same time every day, and then pay attention to the above points. Also pay attention to the changes of body fat over a period of time.