Resistance high-precision measuring system and method with combination of differential method and proportion method
A proportional method and resistance technology, which is applied in the field of low-cost high-precision resistance measurement systems, can solve the problems of difficulty in high-precision resistance measurement, reduce the cost of measurement systems, and cannot be obtained. The effect of reducing precision requirements
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[0052] Example one
[0053] This embodiment provides a resistance measurement system combining the differential method and the proportional method, and its principle block diagram is as follows: figure 1 As shown, the specific circuit diagram is as image 3 Shown, including the measured resistance interface, constant current source, reference resistance R N , The first differential amplifier Amp1, the programmable gain amplifier PGA, the analog to digital converter ADC, the microprocessor CPU, the digital to analog converter DAC, the first analog switch I, the second analog switch II and the third analog switch III.
[0054] The first end of the reference resistor is connected to the first end of the measured resistance interface, the second end of the reference resistor is connected to the constant current source, and the second end of the measured resistance interface is grounded.
[0055] The two ends of the reference resistor are respectively connected to the two input terminals ...
Example Embodiment
[0083] Example two
[0084] In the first embodiment, since one end of the measured resistance is grounded, the voltage at the common connection end of the measured resistance and the reference resistance is the single-ended voltage to ground corresponding to the potential difference between the two ends of the measured resistance, which can be directly input to The first input of the programmable gain amplifier. In the second embodiment, the difference from the first embodiment is that the reference resistor and the resistance under test interface are exchanged, and a second differential amplifier is set between the resistance under test and the programmable gain amplifier, such as Figure 4 Shown. In the second embodiment, since both ends of the measured resistance have potential, it is necessary to set a second differential amplifier Amp-2 with a double gain between the measured resistance and the first input terminal of the programmable gain amplifier. The potential differenc...
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