A wide-range high-precision resistance tester
A resistance tester, high-precision technology, applied in the measurement of resistance/reactance/impedance, measurement of electrical variables, instruments, etc., can solve problems such as large errors, and achieve the effect of improving measurement accuracy
Active Publication Date: 2021-08-17
浙江机电职业技术学院
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Problems solved by technology
This method has high precision in measuring resistances with small and medium resistance values, but the error is large when measuring high and small resistances
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[0022] refer to Figures 1 to 6 As shown in the figure, a wide-range high-precision resistance tester in this embodiment includes a processor (the processor is an STC89C58 microcontroller), a constant current source circuit, a resistance connection circuit under test, a conversion circuit 22, a range switching circuit, an error A correction circuit and a display circuit (the display circuit is a liquid crystal display), the measured resistance connection circuit is used for plugging the measured resistance, the constant current source circuit outputs a constant current source to the measured resistance connection circuit, and the The conversion circuit 22 performs signal conversion and output on the measured resistance connection circuit, the range switching circuit 27 controls the conversion circuit 22 to adjust the sampling conversion efficiency of the conversion circuit 22, and the error correction circuit corrects the signal output by the conversion circuit 22 And input to...
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The invention discloses a wide-range and high-precision resistance tester. The key points of its technical scheme include a processor, a constant current source circuit, a circuit for connecting resistance to be tested, a conversion circuit, a range switching circuit, an error correction circuit and a display circuit. The measured resistance connection circuit is used for plugging the measured resistance, the constant current source circuit performs constant current source output to the measured resistance connection circuit, the conversion circuit performs signal conversion output on the measured resistance connection circuit, and the The range switching circuit controls the conversion circuit to adjust the sampling conversion efficiency of the conversion circuit, the error correction circuit corrects the signal output by the conversion circuit and inputs it to the processor, and the processor receives the corrected signal for processing and inputs it to the display circuit, The display circuit displays information on the processed signal. The invention can detect the resistance with high precision and reduce the test error.
Description
technical field [0001] The invention relates to a resistance tester, more specifically, to a wide-range high-precision resistance tester. Background technique [0002] In practical applications, high-precision measurement of small resistances (milliohms and below) and large resistances (above 10 megohms) is difficult. Generally, the constant voltage method and the constant current method are used, and the constant current method is mostly used. In the general constant current method, the constant current source is fixed, and the value of the measured resistance can be determined according to the magnitude of the sampling voltage on the measured resistance. This method has high accuracy in measuring small and medium resistance values, but has a large error in measuring high and small resistances. SUMMARY OF THE INVENTION [0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a wide-range high-precision resistance tester wi...
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IPC IPC(8): G01R27/14
CPCG01R27/14
Inventor 许振伟程文峰金文兵
Owner 浙江机电职业技术学院