Temp. moisture monitoring meter and method for correcting error of platinum thermal resistance

The invention is a temperature and humidity meter, which includes channel selecting circuit, constant current source circuit, signal amplifying circuit, A/D converting circuit and USB bus interface model, several elements to be measured, each element forms a loop with the channel selecting circuit and constant current source circuit, the voltage between two ends of each element is transmitted to the signal amplifying circuit to be amplified through the channel selecting circuit, and it is converted into digital signal from analog signal through the A/D conversion circuit, and it is transmitted to the input end of the USB bus interface the interface model outputs the channel selecting signal to the channel selecting circuit, the USB interface is connected to the USB interface of PC. The invention is connected to external computer and controlled by the computer; the data is stored in the memory of the computer for carrying on data analysis and management. The invention also provides an error correcting method for platinum heating resistance, in order to achieve the cheap sensor, but acquires the high accuracy.