Platinum resistance temperature measuring equipment and temperature measuring method thereof

Abstract

The invention provides platinum resistance temperature measuring equipment which comprises a constant current circuit, a filter circuit, a module A / D converter circuit, a single-chip, a light emitting diode nixie tube display circuit, a recommend standard 232 (RS232) interface circuit and a personal computer (PC) machine, wherein the constant current circuit comprises a first resistance, a sixth resistance, a first integrated circuit and a platinum resistor, the module A / D converter circuit comprises a module A / D converter, and the filter circuit comprises a second resistance, a second capacitance, a fifth resistance and a first capacitance. The invention further provides a temperature measuring method of the platinum resistance temperature measuring equipment. The platinum resistance temperature measuring equipment and the temperature measuring method of the platinum resistance temperature measuring equipment facilitates temperature calibration, is high in measurement accuracy, good in stability, simple in hardware structure, convenient to produce, and small in size, and facilitates miniaturization of products.

Description

technical field [0001] The invention relates to the field of platinum resistance temperature measurement, and relates to a platinum resistance temperature measurement device and a temperature measurement method thereof. Background technique [0002] Platinum resistance thermometer has the characteristics of high precision, good stability and fast response, so it has been widely used. Since the resistance value of platinum resistors has a nonlinear relationship with temperature, hardware or software is commonly used for data processing. In terms of hardware, related circuits are used to linearly compensate platinum resistance, which not only increases the complexity of the system, but also reduces the stability of the system; in terms of software, methods such as "look-up table method" and "curve fitting method" are often used to process measurement Value, calibration temperature, debugging software will be very complicated. High-precision temperature measurement requires h...

AI Technical Summary

Problems solved by technology

[0007] Using this quadratic equation root finding method can obtain higher measurement accuracy, but it cannot avoid the two parameters related to the platinum resistance, namely the voltage value and current value, which brings inconvenience to the production and debugging of the temperature measuring device.

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