Detection method, apparatus and system for sampling circuit precision of thermometer board card

Abstract

The invention relates to a detection method, device and system for the accuracy of a thermometer board sampling circuit. The method includes: controlling the detection device connected to the thermometer board to be detected and having a selectable resistance value to switch successively to different resistance values, so that the NTC temperature sensing interface of the sampling circuit in the thermometer board is successively connected to different resistance values. Obtain the measured value of each resistance of the thermometer board; determine whether the accuracy of the sampling circuit in the thermometer board meets the preset measurement requirements according to the measured value and the corresponding actual resistance value. The solution of the invention can verify the accuracy of the sampling circuit of the board during the programming of the board, avoids dismantling and maintenance, and is beneficial to reduce the cost.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a detection method, device and system for the accuracy of a sampling circuit of a thermometer board. Background technique [0002] Before the electronic thermometer leaves the factory, it is necessary to test and verify the measurement accuracy and accuracy of the thermometer. Most electronic thermometers on the market use NTC temperature sensors as temperature measuring elements (under a certain measurement power, the resistance value of the NTC thermistor decreases rapidly as the temperature rises; using this feature, the NTC thermistor can be measured by measuring its resistance value To determine the corresponding temperature, so as to achieve the purpose of detecting and controlling temperature). The sampling circuit using NTC temperature sensor, MCU, battery and other board circuits and plastic structural parts are combined into a complete electronic thermomete...

AI Technical Summary

Problems solved by technology

[0005] 2: Repair and check the complete machine with poor precision, the operation is too complicated

[0006] 3: The maintenance cost of the whole machine is too high. If the reason for poor accuracy and accuracy of the thermometer is the bad sampling circuit of the board card, it will cause damage to the front shell and bottom shell of the whole machine, making it impossible to use it again. The NTC temperature sensor will also be unusable due to damage to the shell

[0007] 4: The efficiency of testing and verification is low

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