Temp. moisture monitoring meter and method for correcting error of platinum thermal resistance
A platinum thermal resistance and measuring instrument technology, which is applied in the field of temperature and humidity measuring instruments, can solve the problems of no correction sensor, etc., and achieve the effect of improving the accuracy of temperature measurement and high temperature and humidity measurement
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[0042] As shown in Figure 1, it is a block diagram of the circuit working principle of a temperature and humidity inspection measuring instrument, including channel selection circuit 1, constant current source circuit 2, signal amplification circuit 3, A / D conversion circuit 4 and USB bus interface module 5 , Thirty-one measured components, each of which constitutes a loop through the channel selection circuit 1 and the constant current source circuit 2, and the voltage at both ends of each measured component is input to the signal amplifying circuit 3 through the channel selection circuit 1 for amplification , And then converted into a digital signal by the A / D conversion circuit 4, and input to the data input terminal of the USB bus interface module 5. The data output terminal of the USB bus interface module 5 outputs the channel selection control signal and inputs it to the channel selection circuit The channel strobe control terminal of 1, the USB interface of the USB bus inte...
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