High-precision wide-range temperature measurement system
A technology of temperature measurement and large range, applied in thermometers, measuring devices, measuring heat and other directions, can solve the problem of no high-digit analog-to-digital converter, etc., to reduce the difficulty of layout, improve the measurement accuracy, improve the temperature measurement accuracy and Effect of measuring range
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[0042] The present invention proposes a high-precision, large-range temperature measurement system, such as figure 1 As shown, it includes sensor 1, signal conditioning module 2, channel switching selection module 3, first-level differential amplification module 4, second-level differential amplification module 5, analog / digital conversion module 6, signal acquisition and processing unit 7, adjustable voltage reference Reference 8 and Fixed Voltage Reference Reference 9. The change of sensor 1 is differentially amplified with fixed voltage reference 9 after signal conditioning 2 and channel switching selection 3, and the amplified signal is subtracted and amplified from adjustable voltage reference 8, and then converted into digital by analog / digital converter 6 According to the digital quantity, the signal acquisition and processing unit 7 adjusts the reference voltage output by the adjustable voltage reference reference 8 according to the feedback iterative algorithm and cal...
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