Resistor verifying system

Abstract

The invention discloses a resistor verifying system. The resistor verifying system comprises a reference resistor, a to-be-verified resistor, a constant voltage source, an ampere meter, a temperature sensor, a first calculating unit, an acquiring unit, a second calculating unit and a verifying unit, wherein the constant voltage source is used for applying constant voltage U to ends of the to-be-verified resistor; the ampere meter is used for detecting the current I of a loop where the to-be-verified resistor is located; the temperature sensor is used for detecting current environment temperature t; the constant voltage source, the ampere meter and the temperature sensor are connected through the first calculating unit, and the first calculating unit is used for using the formula R=U / I to obtain the resistance of the to-be-verified resistor under the current environment temperature t; the acquiring unit is used for acquiring the resistivity temperature coefficient alpha corresponding to conductor materials according to the conductor materials of the to-be-verified resistor and the current environment temperature t; the second calculating unit is used for using formula R20=R / (1+ alpha (t-20)) to obtain the resistance R20 of the to-be-verified resistor at 20 DEG C; the verifying unit is used for performing difference value verification on the resistance R20 of the to-be-verified resistor according to the resistance of the reference resistor at 20 DEG C. By the system, verification errors can be reduced effectively, and accuracy and practicality are achieved.

Description

technical field [0001] The invention relates to a resistance calibration system. Background technique [0002] Resistors are indispensable electronic components in electronic circuits, and their accuracy directly affects the reliability and performance of electronic circuits. Resistors can be divided into ordinary resistors and precision resistors due to the difference in nominal accuracy. The accuracy of ordinary resistors is generally It is about 5%, and the accuracy of precision resistors must be at least 1%, or even higher, and the resistance value is affected by various factors such as temperature, resistance material and conductor length, so the actual resistance of the same nominal value There is often a certain difference in the resistance value, so it is very necessary to check the resistance value of the resistor in actual use, especially for the resistor used in the sampling circuit, the error of the sampling resistor itself will directly lead to inaccurate contro...

AI Technical Summary

Problems solved by technology

[0002] Resistors are indispensable electronic components in electronic circuits, and their accuracy directly affects the reliability and performance of electronic circuits. Resistors can be divided into ordinary resistors and precision resistors due to the difference in nominal accuracy. The accuracy of ordinary resistors is generally It is about 5%, and the accuracy of precision resistors must be at least 1%, or even higher, and the resistance value is affected by various factors such as temperature, resistance material and conductor length, so the actual resistance of the same nominal value There is often a certain difference in the resistance value, so it is very necessary to check the resistance value of the resistance in actual use, especially for the resistance in the sampling circuit, the error of the sampling resistance itself will directly lead to inaccurate control

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