Portable impedance measurement instrument based on FPGA (field programmable gate array)

Abstract

The invention relates to a portable impedance measurement instrument based on FPGA (field programmable gate array), belonging to the technical field of impedance measurement. The portable impedance measurement instrument based on the FPGA is characterized in that the impedance measurement instrument includes a microprocessor module, a sine signal generator module, a self-balancing bridge module, an automatic gain adjustment module, a phase sensitive demodulation module, a display module and a power supply module; the microprocessor module is connected with the sine signal generator module, the self-balancing bridge module, the automatic gain adjustment module and the phase sensitive demodulation module; the impedance measurement value is displayed by the display module; and the power supply module is used for supplying power to the circuit. The portable impedance measurement instrument has the advantages of simple measurement circuit, high integrity, high digital degree, small size and good portability, and is economic and practical, and can meet the requirement for impedance measurement in the common engineering field. The instrument can measure single parameters of impedance, capacitance and inductance or complex impedance parameters including resistance, capacitance and inductance, and can also achieve sweep frequency measurement.

Description

technical field [0001] The invention belongs to the technical field of impedance measurement, in particular to a portable impedance measurement instrument based on FPGA. Background technique [0002] At present, in industrial production such as electric power, communication, aviation, and materials, impedance measurement is often required. For example, by measuring the impedance of the material to analyze its conductivity and dielectric constant; by measuring the impedance of petroleum products to analyze the moisture and impurities contained in it; by measuring the impedance of the coaxial cable to determine whether there is an open circuit or short circuit fault; by measuring The impedance of the sensor is used to judge its effectiveness; the impedance of electronic components is used to judge whether it is usable. In many occasions, the measured object is not a resistance, inductance or capacitance with a single parameter, but a mixed model of resistance, inductance and ...

AI Technical Summary

Problems solved by technology

However, in the field of portable impedance measurement, there are only a few special instruments, such as measuring the internal impedance of the battery, measuring the impedance of the power supply circuit, etc.

The test range, frequency band and other parameters of special impedance measuring instruments are relatively fixed, and generally have special test fixtures, which are not suitable for general measurement

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