Combined intelligent universal meter

Abstract

The invention discloses a combined intelligent universal meter, which mainly comprises circuits such as an analog front-end unit (1), an RLC (Radio Link Control) electric bridge front-end unit (2), a signal conditioning unit (3), an A / D (Analog / Digital) conversion unit (4), a counter front-end unit (5), a CPU (Central Processing Unit) control unit (6) and a power transformation management unit (7). A 32-bit ARM (Advanced RISC Machines) digital-analog hybrid single-chip microprocessor with powerful DSP (Digital Signal Processing) data processing capacity is used as a core component of the universal meter, and functional instruments such as an intelligent alternating current millivoltmeter, an RLC digital electric bridge and an electronic counter are completely integrated in the intelligent universal meter in combination with a well-designed precision analog circuit through program control. The basic parameters of elements such as a resistor, a capacitor and an inductor can be automatically measured, and dynamic and static signals such as alternating current and direct current signals and pulse parameters can also be comprehensively measured. The combined intelligent universal meter is a necessary tool for the electronic industry, electric industry and electric apparatus maintenance personnel.

Description

technical field [0001] The invention belongs to a measuring instrument, and in particular relates to a circuit design, good overall performance, high measurement accuracy, small volume, low cost, which integrates digital true effective value measurement of AC signals, digital RLC bridge measurement, precise measurement of DC signals, electronic A combined intelligent multimeter with dynamic and static measurement functions such as counting. Background technique [0002] The multimeter is a common and commonly used portable electrical signal measurement tool. From the early analog multimeter to the modern digital multimeter, not only the function is enhanced, but also the measurement accuracy is greatly improved. It is one of the most commonly used measuring instruments for electronic workers. It is an instrument that integrates a variety of commonly used electrical measurement functions. The common multimeter has three basic test items of voltage, current and resistance. No...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the limitation of the measurement principle and effective value measurement chip, whether it is an analog multimeter, a digital multimeter, or a high-end smart digital multimeter, they are weak in the measurement of AC signals, especially for higher frequency AC signals. The multimeter can only measure the AC signal of about 100KHz, and the high-end intelligent digital multimeter can only measure the AC signal of about 300KHz, which cannot reach the level above 1MHz of the AC millivolt meter, and cannot guarantee accurate measurement of the weak AC signal. Therefore, In actual work, it is often necessary to purchase a professional AC millivolt meter;

[0005] 2. The measurement of electronic components is involved in the design and maintenance of electronic equipment, especially for the precise measurement of resistance, capacitance and inductance. Precisely measure the resistance value, but the existing digital multimeters basically cannot accurately measure various parameters of capacitance and inductance. Therefore, in actual work, it is often necessary to purchase professional RLC bridge measurement equipment;

[0006] 3. The electronic counter is an electronic measuring instrument that completes functions such as frequency measurement, time measurement, and counting. Some of the existing digital multimeters already have certain measurement functions in the electronic counter, such as frequency and duty cycle measurement. Due to the measurement Due to the limitations of principle and structure, the existing digital multimeters are basically not competent for frequency measurement. Therefore, in actual work, it is often necessary to purchase professional electronic counter measurement equipment

[0007] To sum up, the prior art digital multimeter has low precision, few measurement parameters, high cost, poor adaptability and other deficiencies. It is necessary to develop a combined intelligent multimeter that can overcome the deficiencies of the prior art to meet the wide and growing needs. Electronic measurement technology requirements

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