A measuring instrument with the functions of digital oscilloscope, bridge and multimeter

Abstract

The utility model relates to electrical measurement technical field especially a kind of measurement instrument with digital oscilloscope, electric bridge, multimeter function three-in-one. The measurement instrument includes shell, shell surface is provided with liquid crystal display, function button, Type-C port, oscilloscope sampling input end, kelvin four-line input end and multimeter measurement input end;Shell inside is provided with battery and power supply voltage stabilizing system, main control chip, oscilloscope module, electric bridge module, multimeter module, buzzer and light signal prompt module. The main control chip is electrically connected with liquid crystal display, function button and each measurement module respectively, for processing signal and output display;The device can simultaneously realize oscilloscope measurement, electric bridge measurement and multimeter measurement, applicable to electronic research and development, experimental teaching and equipment detection etc.

Description

Technical Field

[0001] This utility model relates to a measuring instrument, specifically a measuring instrument that integrates the functions of a digital oscilloscope, a bridge, and a multimeter. Background Technology

[0002] With the rapid development of electronic and information technologies, electrical measuring tools such as oscilloscopes, bridges, and multimeters have become indispensable instruments and equipment in electronic research and development, experimental teaching, industrial production, and equipment maintenance.

[0003] Digital oscilloscopes are primarily used for sampling, displaying, and analyzing the waveforms of electrical signals. They can intuitively reflect the changes of signals over time and are important tools for circuit debugging and signal diagnosis. Existing digital oscilloscopes generally have sampling input ports, signal amplification circuits, analog-to-digital conversion circuits, and waveform display interfaces, but they are often complex in structure, large in size, and inconvenient to carry.

[0004] Bridge measuring instruments are commonly used to measure impedance parameters such as resistance, capacitance, and inductance. Traditional LCR bridges often employ a Kelvin four-wire connection for high-precision measurements, effectively eliminating the influence of lead resistance. However, common bridge measuring devices are mostly standalone instruments with limited functionality, large size, and require separate power supplies, increasing usage and maintenance costs.

[0005] Digital multimeters are the most common electrical measuring tools, widely used for measuring basic electrical parameters such as voltage, current, and resistance. Existing digital multimeters are typically small and easy to operate, but their functionality is relatively limited, making it difficult to simultaneously meet the needs of measuring complex electrical signals and high-precision impedance measurements.

[0006] In practical applications, engineers and researchers often need to use oscilloscopes, bridge circuits, and multimeters simultaneously to complete different types of tests. For example, during circuit development, an oscilloscope is needed to analyze signal waveforms, a bridge circuit is used to measure component parameters, and a multimeter is also needed to detect circuit voltage or current. In such cases, multiple devices are often required, which not only increases the complexity of experiments and maintenance but also leads to problems such as large space occupation, high weight, cumbersome operation, and high power supply and maintenance costs. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides a three-in-one measuring instrument that integrates the functions of a digital oscilloscope, a bridge circuit, and a multimeter, effectively overcoming the shortcomings of existing technologies.

[0008] This utility model is achieved through the following technical solution: a measuring instrument integrating the functions of a digital oscilloscope, bridge, and multimeter, comprising: case; The LCD screen, function buttons, Type-C port, oscilloscope sampling input terminal, Kelvin four-wire input terminal, and multimeter measurement input terminal are disposed on the surface of the housing; The battery and power supply voltage regulation system, main control chip, oscilloscope module, bridge module, multimeter module, buzzer and indicator light module are installed inside the housing; The main control chip is electrically connected to the LCD screen, function buttons, oscilloscope module, bridge module, and multimeter module, respectively, and is used to process the measurement signals and display the results. The oscilloscope sampling input terminal is connected to the oscilloscope module via a signal amplification and processing circuit and an ADC conversion circuit; The Kelvin four-wire input terminal is connected to the bridge module via a signal amplification circuit; The multimeter's measurement input terminal is connected to the multimeter module via a measurement signal processing circuit; The power supply stabilization system is connected to the battery and is used to supply power to the main control chip, LCD screen, oscilloscope module, bridge module, multimeter module, buzzer and indicator light module; The buzzer and indicator light modules are respectively connected to the main control chip and are used to provide sound prompts and status indications during measurement and operation.

[0009] As a preferred technical solution, the power supply voltage regulation system includes a control circuit, a boost circuit, a voltage regulation circuit, and a protection circuit.

[0010] As a preferred technical solution, the oscilloscope module includes an oscilloscope sampling signal amplification and processing circuit, an oscilloscope signal ADC conversion and processing circuit, and an oscilloscope signal processing and analysis module, the output of which is connected to the main control chip.

[0011] As a preferred technical solution, the bridge module is an LCR bridge signal processing module, which is used to amplify and process the signal input through the Kelvin four-wire input terminal and then send it to the main control chip.

[0012] As a preferred technical solution, the multimeter module includes a multimeter measurement signal processing module, which processes the electrical signal acquired by the multimeter measurement input terminal and sends it to the main control chip.

[0013] As a preferred technical solution, the function keys are used to control the switching operation of the oscilloscope module, the bridge module, and the multimeter module.

[0014] As a preferred technical solution, the main control chip is a microcontroller unit (MCU), which is used to realize signal acquisition, data processing, communication and overall control.

[0015] The beneficial effects of this utility model are: This utility model integrates three commonly used electrical measurement functions—digital oscilloscope, bridge, and multimeter—into one instrument, so that users do not need to carry multiple devices at the same time to complete signal waveform analysis, impedance parameter measurement, and basic electrical parameter detection, which significantly reduces the number of devices and operation steps and improves the convenience of use; This utility model integrates the main control chip, power supply stabilization system and various measurement modules in the same housing, so that the overall instrument can maintain multiple functions while achieving a small size and light weight design, making it convenient to carry and use on site, and especially suitable for mobile operation and laboratory teaching scenarios. In this invention, the oscilloscope channel, bridge channel, and multimeter channel are all connected to the main control chip through independent sampling, amplification, and signal processing circuits, which realizes the non-interference and unified management of the three measurement functions, and improves the reliability and accuracy of the measurement data. The bridge section of this invention adopts a Kelvin four-wire input structure, which effectively reduces the influence of lead resistance on impedance measurement and improves the accuracy of impedance parameter measurement; the oscilloscope section, through signal amplification and analog-to-digital conversion links in conjunction with the processing algorithm of the main control chip, ensures the accuracy of waveform acquisition and analysis. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a system schematic diagram of the present invention. Detailed Implementation

[0018] All features disclosed in this specification, or steps in all methods or processes disclosed herein, may be combined in any way, except for mutually exclusive features and / or steps.

[0019] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0020] like Figure 1As shown, this utility model provides a three-in-one measuring instrument integrating the functions of a digital oscilloscope, bridge, and multimeter. The measuring instrument comprises a housing made of insulating material, which houses the internal functional circuit modules and supports external human-machine interface components. The front surface of the housing features an LCD screen, function buttons, a Type-C port, an oscilloscope sampling input, a Kelvin four-wire input, and a multimeter measurement input. The LCD screen serves as the primary human-machine interface, displaying various measurement parameters, waveforms, and operating status. Its display content is processed and output by the main control chip, providing intuitive information feedback in different functional modes.

[0021] Function buttons are located around the display screen, allowing users to select measurement modes, ranges, sampling rates, and other operation commands. The function button signals are connected to the main control chip via wires or a flexible circuit board, where the chip identifies and uses these signals for control logic. The Type-C port is fixed to the outer wall of the housing and is electrically connected to both the power supply regulator and the main control chip. It serves two purposes: charging the battery via an external USB adapter or computer, and enabling data communication with the computer, such as transmitting sampled waveforms, exporting measurement data, or receiving firmware upgrades.

[0022] The oscilloscope's sampling input terminal uses a standard probe interface. Its input signal enters the internal circuit via a range switch to achieve voltage range adjustment and safety protection.

[0023] The Kelvin four-wire input uses four independent terminals, one for current injection and one for voltage sampling, ensuring that errors caused by lead resistance are effectively eliminated during bridge measurements. The multimeter's measurement inputs are designed with universal jacks, allowing the insertion of probes or test leads for measuring common electrical parameters such as voltage, current, and resistance.

[0024] Inside the casing are the battery and power supply regulation system, main control chip, oscilloscope module, bridge module, multimeter module, buzzer, and indicator light module. The battery, as the core power supply for the entire device, is preferably a rechargeable lithium battery, ensuring long-term continuous operation in portable applications.

[0025] The power supply voltage regulation system is connected to the battery and internally includes control circuitry, boost circuitry, voltage regulation circuitry, and protection circuitry. It converts the battery's output energy into stable multi-channel DC voltages, which are then supplied to the main control chip, LCD display, oscilloscope module, bridge module, multimeter module, buzzer, and indicator light module. The system also features overcurrent, overvoltage, and undervoltage protection functions to ensure the safety and stability of the circuit under different operating conditions. The main control chip, as the core control unit of the entire device, adopts a microcontroller unit (MCU) architecture and is responsible for signal acquisition, digital processing, data analysis, communication management, and overall logic control of the device.

[0026] The main control chip establishes electrical connections with the LCD screen, function buttons, oscilloscope module, bridge module, multimeter module, buzzer, and indicator light module to ensure coordinated operation of each part.

[0027] The oscilloscope module consists of multiple sub-circuits. The electrical signal received at the oscilloscope's sampling input terminal first enters the sampling signal amplification and processing circuit through the range switching circuit. This circuit includes multi-stage amplification units and has gain adjustment functionality to accommodate input signals of different amplitudes.

[0028] The amplified signal is sent to the oscilloscope's ADC conversion circuit, where a high-speed analog-to-digital converter converts the analog electrical signal into a digital signal, which then enters the oscilloscope's signal processing and analysis module. This analysis module filters, triggers, stores, and preprocesses the waveform data. Its output is connected to the main control chip, which further integrates the data and displays the waveform on the LCD screen, thus achieving real-time waveform measurement and analysis.

[0029] The bridge module is used to measure impedance parameters such as resistance, capacitance, and inductance. The measurement signal received at the Kelvin four-wire input terminal first enters the bridge signal acquisition and amplification processing circuit. This circuit has high input impedance and low noise characteristics and is used to amplify weak detection signals.

[0030] The amplified signal is sent to the LCR bridge signal processing circuit. This circuit uses an internal excitation source and phase-sensitive detection unit to measure the impedance of the component and decompose its parameters, outputting the results in digital form to the main control chip. The main control chip processes and displays the received data, allowing the user to read the resistance, capacitance, or inductance values ​​of the component under test via an LCD screen.

[0031] The multimeter module is used to measure common parameters such as voltage, current, and resistance. The signal acquired by the multimeter's measurement input terminal is processed by the measurement signal processing circuit, which performs range selection, attenuation, isolation, and rectification to adapt it to the input range of the main control chip.

[0032] The processed signal is sent to the multimeter module for numerical conversion and preprocessing before being transmitted to the main control chip. The main control chip then displays the results on the LCD screen. By using the function buttons, users can switch between different measurement modes and quickly obtain the desired numerical results.

[0033] The buzzer and indicator light module serve as notification and alarm units, respectively, and are electrically connected to the main control chip. When a measurement is completed, an over-range condition occurs, or an operational status notification is needed, the main control chip sends a control signal to drive the buzzer to emit an audible alert or to activate the indicator light module to illuminate different colored lights, allowing the user to promptly understand the equipment status. This combination of sound and light notification improves the intuitiveness and safety of operation.

[0034] This measuring instrument integrates an oscilloscope, a bridge, and a multimeter into a single housing, forming a complete signal input, processing, display, and prompting chain.

[0035] The main control chip, as the core unit, undertakes all tasks of data acquisition, processing, display, and communication; the power supply stabilization system ensures the stable operation of each module; the LCD screen and function buttons provide users with operation and interaction; and the buzzer and indicator light modules enhance the feedback capability during use. Through the above structural design, this utility model realizes a multifunctional, integrated, miniaturized, and portable measuring instrument, which can be widely used in electronic research and development, experimental teaching, industrial testing, and on-site maintenance.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A measuring instrument integrating the functions of a digital oscilloscope, a bridge circuit, and a multimeter, characterized in that: include: case; The LCD screen, function buttons, Type-C port, oscilloscope sampling input terminal, Kelvin four-wire input terminal, and multimeter measurement input terminal are disposed on the surface of the housing; The battery and power supply voltage regulation system, main control chip, oscilloscope module, bridge module, multimeter module, buzzer and indicator light module are installed inside the housing; The main control chip is electrically connected to the LCD screen, function buttons, oscilloscope module, bridge module, and multimeter module, respectively, and is used to process the measurement signals and display the results. The oscilloscope sampling input terminal is connected to the oscilloscope module via a signal amplification and processing circuit and an ADC conversion circuit; The Kelvin four-wire input terminal is connected to the bridge module via a signal amplification circuit; The multimeter's measurement input terminal is connected to the multimeter module via a measurement signal processing circuit; The power supply stabilization system is connected to the battery and is used to supply power to the main control chip, LCD screen, oscilloscope module, bridge module, multimeter module, buzzer and indicator light module; The buzzer and indicator light modules are respectively connected to the main control chip and are used to provide sound prompts and status indications during measurement and operation.

2. The measuring instrument combining the functions of a digital oscilloscope, bridge, and multimeter as described in claim 1, characterized in that: The power supply voltage regulation system includes a control circuit, a boost circuit, a voltage regulation circuit, and a protection circuit.

3. The measuring instrument combining the functions of a digital oscilloscope, bridge, and multimeter as described in claim 1, characterized in that: The oscilloscope module includes an oscilloscope sampling signal amplification and processing circuit, an oscilloscope signal ADC conversion and processing circuit, and an oscilloscope signal processing and analysis module. The output terminal of the oscilloscope signal processing and analysis module is connected to the main control chip.

4. The measuring instrument combining the functions of a digital oscilloscope, bridge, and multimeter as described in claim 1, characterized in that: The bridge module is an LCR bridge signal processing module, which amplifies and processes the signal input through the Kelvin four-wire input terminal before sending it to the main control chip.

5. The measuring instrument combining the functions of a digital oscilloscope, bridge, and multimeter as described in claim 1, characterized in that: The multimeter module includes a multimeter measurement signal processing module, which processes the electrical signal acquired by the multimeter measurement input terminal and sends it to the main control chip.

6. The measuring instrument combining the functions of a digital oscilloscope, bridge, and multimeter as described in claim 1, characterized in that: The function keys are used to control the switching operation of the oscilloscope module, bridge module and multimeter module.

7. The measuring instrument combining the functions of a digital oscilloscope, bridge, and multimeter as described in claim 1, characterized in that: The main control chip is a microcontroller unit (MCU), which is used to realize signal acquisition, data processing, communication and overall control.

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