Now the least current I set is 25mA, when the current is least current, the SpO2 would be wrong. And it test on Fluke' simulator.I tried to test different SpO2 value,and if the current is 25mA or lower,the calculation results of SpO2 are all nearby 80%.And I set the least current to 3mA or higher,then the SpO2 would be right.