CN203275482U - Data acquisition card of virtual oscilloscope - Google Patents

Abstract

The utility model discloses a data acquisition card of a virtual oscilloscope. The data acquisition card comprises a master controller module, a signal conditioning module, a data acquisition and buffer module and a data transmitting-receiving module; the master controller module is provided with transmission lines to connect with the signal conditioning module, the data acquisition and buffer module and the data transmitting-receiving module; and the signal conditioning module is used for transiting input signals, and an output terminal of the signal conditioning module is connected with the data acquisition and buffer module; and an input terminal of the data transmitting-receiving module is connected with the data acquisition and buffer module, and an output terminal of the data transmitting-receiving module is connected with a computer. The data acquisition card of the virtual oscilloscope has small size, low cost and high expansibility.

Description

A Virtual Oscilloscope Data Acquisition Card

technical field

The utility model relates to the technical field of data acquisition, in particular to a virtual oscilloscope data acquisition card. the

Background technique

The oscilloscope product is a kind of electronic measurement equipment widely used in the production and debugging process of electronic products. Traditional oscilloscope products have the advantages of high precision and fast speed, but due to the disadvantages of single function, high price, and large size, they are not cost-effective, portable, and expandable. Therefore, traditional oscilloscope products are popular among students, The penetration rate among individual users such as ordinary electronics enthusiasts is relatively low. the

The virtual oscilloscope uses computer-based virtual technology to simulate the operation and processing functions of traditional oscilloscopes, and imitates the operation panel of the oscilloscope through the computer system graphical user interface to complete the functions of instrument operation, signal acquisition, conditioning, analysis and processing, and display output. The composition of the virtual oscilloscope is the same as that of general instruments, which are signal acquisition, processing, and display. The acquisition card completes the signal acquisition and pre-processing work, and the other two parts are realized by computer software. the

In recent years, domestic virtual oscilloscope products have also begun to develop, but most of the data acquisition card technologies of these products use FPGA/CPLD or special high-speed AD converters, etc., which have the disadvantage of high prices. the

Utility model content

In order to solve the above technical problems, the utility model provides a virtual oscilloscope data acquisition card suitable for entry-level applications with low price, moderate performance, convenient portability and powerful expansion functions. the

The technical solution of the utility model is: this virtual oscilloscope data acquisition card is composed of a main controller module, a signal conditioning module, a data acquisition and buffer module and a data transceiver module, the main controller module and the signal conditioning module, data The acquisition and buffer module and the data transceiver module are all provided with transmission lines, the signal conditioning module converts the input signal, and its output is connected to the data acquisition and buffer module, and the input of the data transceiver module is connected to the data acquisition and buffer module , the output is connected to the computer. the

In the utility model, the main controller module adopts STM32F103C8T6 as the processor. the

In the utility model, the signal conditioning module can process 2-way input signals to realize the functions of voltage following and program-controlled amplification. the

In the utility model, the number of data acquisition digits of the data acquisition and buffer module is 12, and the sampling rate is 1MHz. the

The beneficial effects of the utility model are: the STM32F103C8T6 with high performance, low cost and low power consumption is used as the core processor, the chip has a 12-bit AD converter and a USB2. hardware circuit. SMD components are selected, small in size and low in cost. the

Below in conjunction with accompanying drawing, the utility model is further described. the

Description of drawings

Fig. 1 is the overall frame diagram of the utility model;

Fig. 2 is the main controller module circuit diagram of the present utility model;

Fig. 3 is the utility model signal conditioning module circuit diagram;

Fig. 4 is the utility model USB interface circuit diagram;

Fig. 5 is the utility model JTAG interface circuit diagram. the

Detailed ways

Introduce the realization process of the present utility model in detail below in conjunction with accompanying drawing. As shown in Figure 1, a virtual oscilloscope data acquisition card includes a main controller module, a signal conditioning module, a data acquisition and buffer module, and a data transceiver module. the

Figure 2 is the circuit diagram of the main controller module. The processor chip adopts STM32F103C8T6, which is based on the ARM Cortex-M3 core, integrates embedded Flash and SRAM memory on-chip, and has two 12-bit us-level AD converters (16 channels). Measuring range: 0-3.6V; with USB2.0 interface. the

The virtual oscilloscope data acquisition card of the utility model has dual-channel input, and the signal conditioning module circuits of the two channels are repeated, and the circuit of one channel is shown in FIG. 3 . After the signal to be tested is input, TL082 is used to realize voltage following, the input impedance is 1M, and then the signal is amplified by a program-controlled amplifier circuit composed of operational amplifier TL082 and 8-channel digital control analog electronic switch CD4051, and the amplification factor of the program-controlled amplifier circuit is determined by the main The controller module is controlled by the STM32F103C8T6 processor. The amplified signals to be tested by the two channels are respectively sent to the AD converter input pins PB0 and PB1 of STM32F103C8T6 for AD conversion. the

After power-on, STM32F103C8T6 initializes the hardware device. The main tasks include configuring the system clock, initializing the AD converter and USB. Then the data acquisition module starts to work. First, the AD converter performs sampling, and when the sampling of the specified length is completed, the data is stored in the high-speed memory (RAM). When a trigger signal is generated, the data transceiver module works, triggers the DMA channel, and sends the waveform data collected by the AD converter to the USB buffer, and then the USB interface circuit sends the waveform data to the host computer on the computer, and the host computer sends Instructions and data are also transmitted to the STM32F103C8T6 processor of the main controller module by the USB interface circuit. USB interface circuit shown in Figure 4. the

The utility model can carry out operations such as debugging, upgrading and expanding of the function of the data acquisition card of the virtual oscilloscope through the JTAG interface circuit shown in FIG. 5 . the

Claims (4)

1. a kind of virtual oscilloscope data acquisition card, it is characterized in that: comprise main controller module, signal conditioning module, data acquisition and buffering module and data transceiver module, described main controller module and signal conditioning module, data acquisition and buffering module 3. The three modules of the data transceiver module are all provided with transmission lines. The signal conditioning module converts the input signal, and its output is connected to the data acquisition and buffer module. The input of the data transceiver module is connected to the data acquisition and buffer module, and the output is connected to the data acquisition and buffer module. computer. the 2. A virtual oscilloscope data acquisition card according to claim 1, characterized in that: said main controller module uses STM32F103C8T6 as a processor. the 3. A virtual oscilloscope data acquisition card according to claim 1, characterized in that: said signal conditioning module can process two input signals to realize voltage following and program-controlled amplification functions. the 4. A kind of virtual oscilloscope data acquisition card according to claim 1, characterized in that: the data acquisition bit number of said data acquisition and buffer module is 12, and the sampling rate is 1MHz. the

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