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

Abstract

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.

Description

technical field [0001] The invention relates to a temperature and humidity measuring instrument, in particular to a method for correcting the error of a platinum thermal resistance temperature sensor in a microcomputer-controlled temperature and humidity patrol measuring instrument. Background technique [0002] At present, most of the temperature and humidity measuring instruments on the market are intelligent instruments based on single-chip microcomputers. Generally, the error caused by the sensor is not corrected. The structure of the upper and lower computers is adopted. Machine connection, mainly used in on-site industrial measurement and control. The measurement personnel in the metrology department and the environmental testing department carry the intelligent temperature and humidity instrument based on the single-chip microcomputer to go out to work, and generally adopt two methods, one is to manually record the measurement data or use the micro-printer that comes ...

AI Technical Summary

Problems solved by technology

It can be seen that although the general intelligent instruments based on single-chip microcomputers on the market may have high display accuracy, users have to purchase expensive high-precision sensors because they do not correct the errors caused by sensors. 24 channels, buying 24 expensive sensors is a lot of money for users

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