Multi-electrical quantity data acquisition device based on universal meter card

Abstract

The utility model provides a multi-electrical-quantity data acquisition device based on a universal meter card, and relates to the field of electrical quantity data acquisition, and the device comprises an input module which comprises a plurality of signal input channels; the switching matrix module is connected with the input module; the universal meter card is connected with the switching matrix module; the embedded computer is connected with the universal meter card; the switching control module is respectively connected with the switching matrix module and the embedded computer; wherein the embedded computer generates and sends a control instruction, the switching control module receives and decodes the control instruction to generate a control word, the switching matrix module performs multi-selection on multiple paths of input signals in the input module according to the control word and sends a selected signal to the universal meter card, and the universal meter card measures the selected signal. And the measurement result is transmitted back to the embedded computer, so that the technical problems of high cost, large size and inconvenience in carrying of the whole device due to multiple signal types and multiple channels of the existing data acquisition device are solved.

Description

Technical Field

[0001] This application relates to the field of electrical quantity data acquisition, and particularly to a multi-electrical quantity data acquisition device based on a multimeter card. Background Art

[0002] In scientific research practice, there is a scenario where the object to be measured has multiple electrical signals such as current, voltage, resistance, and frequency; each electrical signal has multiple (e.g., 8 channels or 16 channels) signal channels; the test accuracy requirement for the signal is relatively high, up to 0.005% - 0.01%; and the signal changes slowly and only requires a relatively low sampling rate, etc. If a data acquisition device is designed based on a high-precision synchronous data acquisition card, due to the variety of signal types, multiple signal conditioning boards are required; and due to the relatively large number of signal channels, multiple data acquisition boards need to be used; plus the chassis, controller, etc., it often leads to a relatively high cost, large volume, and inconvenient portability of the entire device. Utility Model Content

[0003] This application provides a multi-electrical quantity data acquisition device based on a multimeter card, which solves the technical problems of the existing data acquisition device having a relatively high cost, large volume, and inconvenient portability due to the variety of signal types and the large number of channels, and achieves the technical effect of realizing low-cost, small-volume, and portable electrical quantity data acquisition based on a multi-functional digital multimeter card.

[0004] To solve the above problems, this application provides a multi-electrical quantity data acquisition device based on a multimeter card, including: an input module, where the input module includes multiple signal input channels; a switching matrix module, where the input module is connected to the switching matrix module; a multimeter card, where the switching matrix module is connected to the multimeter card; an embedded computer, where the multimeter card is connected to the embedded computer; a switching control module, where the switching matrix module and the embedded computer are respectively connected to the switching control module; where the embedded computer generates and sends a control instruction, the switching control module receives and decodes the control instruction to generate a control word, the switching matrix module performs multiple selections and one selection on the multiple input signals of the multiple signal input channels in the input module according to the control word and sends the selected signal to the multimeter card, the multimeter card measures the selected signal, and sends the measurement result back to the embedded computer.

[0005] Preferably, the input module includes: K voltage signal input channels, K current signal input channels, K resistance signal input channels, and K frequency signal input channels, where each signal input channel includes an aviation plug and a signal line, and K is a positive integer.

[0006] Preferably, the switching matrix module includes: a first-level switching matrix and a second-level switching matrix; the first-level switching matrix includes switching sub-matrix 1a, switching sub-matrix 1b, switching sub-matrix 1c, and switching sub-matrix 1d, where each switching sub-matrix is a relay array composed of K standard relays; the second-level switching matrix is a relay array composed of a voltage relay, a current relay, a resistance relay, and a frequency relay; wherein, the positive and negative poles of the output end of the switching sub-matrix 1a are connected to the positive and negative poles of the input end of the voltage relay, the positive and negative poles of the output end of the switching sub-matrix 1b are connected to the positive and negative poles of the input end of the current relay, the positive and negative poles of the output end of the switching sub-matrix 1c are connected to the positive and negative poles of the input end of the resistance relay, and the positive and negative poles of the output end of the switching sub-matrix 1d are connected to the positive and negative poles of the input end of the frequency relay.

[0007] Preferably, the positive and negative poles of the output end of the K-channel voltage signal input channel are mapped and connected to the positive and negative poles of the input ends of the K standard relays in the switching sub-matrix 1a; the positive and negative poles of the output end of the K-channel current signal input channel are mapped and connected to the positive and negative poles of the input ends of the K standard relays in the switching sub-matrix 1b; the positive and negative poles of the output end of the K-channel resistance signal input channel are mapped and connected to the positive and negative poles of the input ends of the K standard relays in the switching sub-matrix 1c; the positive and negative poles of the output end of the K-channel frequency signal input channel are mapped and connected to the positive and negative poles of the input ends of the K standard relays in the switching sub-matrix 1d.

[0008] Preferably, the embedded computer is connected to the switching control module through an RS232 interface.

[0009] Preferably, the multimeter card is connected to the embedded computer through a USB interface.

[0010] Preferably, the switching control module is connected to the first-level switching matrix through an RS232 interface.

[0011] Preferably, the switching control module is connected to the second-level switching matrix through an RS232 interface.

[0012] One or more of the above technical solutions in this application have at least one or more of the following technical effects:

[0013] The present application provides a multi - electrical - quantity data acquisition device based on a multimeter card, including: an input module, a switching matrix module, a multimeter card, an embedded computer, and a switching control module; wherein, the embedded computer generates and sends control instructions, the switching control module receives and decodes the control instructions to generate a control word, the switching matrix module performs a multiple - select - one operation on multiple input signals of the multiple signal input channels in the input module according to the control word and sends the selected signal to the multimeter card, and the multimeter card measures the selected signal and returns the measurement result to the embedded computer, solving the technical problem that the existing data acquisition device has a high cost, a large volume, and is inconvenient to carry due to a large number of signal types and channels, and achieving the technical effect of realizing low - cost, small - volume, and portable electrical - quantity data acquisition based on a multifunctional digital multimeter card. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic block diagram of a multi - electrical - quantity data acquisition device based on a multimeter card provided in an embodiment of the present application;

[0016] Figure 2 It is a schematic block diagram of the input module of a multi - electrical - quantity data acquisition device based on a multimeter card provided in an embodiment of the present application;

[0017] Figure 3 It is a schematic block diagram of the switching matrix module of a multi - electrical - quantity data acquisition device based on a multimeter card provided in an embodiment of the present application;

[0018] Figure 4 It is a schematic connection diagram of the switching sub - matrix signals of a multi - electrical - quantity data acquisition device based on a multimeter card provided in an embodiment of the present application;

[0019] Figure 5 It is a schematic diagram of the functions of the embedded computer of a multi - electrical - quantity data acquisition device based on a multimeter card provided in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0022] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. The term "and / or" used in the present application includes any and all combinations of one or more of the related listed items.

[0023] Technical concept

[0024] The present application provides a multi-electrical quantity data acquisition device based on a multimeter card, which solves the technical problems of the existing data acquisition device, such as high cost, large volume, and inconvenient portability due to the large number of signal types and channels.

[0025] The technical solution in the present application has the following overall structure: an input module, where the input module includes multiple signal input channels; a switching matrix module, where the input module is connected to the switching matrix module; a multimeter card, where the switching matrix module is connected to the multimeter card; an embedded computer, where the multimeter card is connected to the embedded computer; a switching control module, where the switching matrix module and the embedded computer are respectively connected to the switching control module; among them, the embedded computer generates and sends a control instruction, the switching control module receives and decodes the control instruction to generate a control word, the switching matrix module performs a multi-select-one operation on the multiple input signals of the multiple signal input channels in the input module according to the control word and sends the selected signal to the multimeter card, the multimeter card measures the selected signal, and returns the measurement result to the embedded computer, achieving the technical effect of realizing low-cost, small-volume, and portable electrical quantity data acquisition based on a multifunctional digital multimeter card.

[0026] To make the objectives, technical solutions and advantages of this application more clear, the following will, in conjunction with the accompanying drawings in the embodiments of this application, clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are some, rather than all, of the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this application.

[0027] Embodiment

[0028] As Figure 1 shown, this application provides a multi-electrical quantity data acquisition device based on a multimeter card. The device includes:

[0029] An input module, wherein the input module includes multiple signal input channels.

[0030] Further, as Figure 2 shown, the input module further includes:

[0031] K voltage signal input channels, K current signal input channels, K resistance signal input channels, and K frequency signal input channels, where each signal input channel includes an aviation plug and a signal line, and K is a positive integer.

[0032] Specifically, the input module of this application is used to access voltage, current, resistance, and frequency signals and includes multiple signal input channels. Exemplarily, the input module includes K voltage signal input channels, K current signal input channels, K resistance signal input channels, and K frequency signal input channels. The voltage signal input channel is used to access voltage signals, the current signal input channel is used to access current signals, the resistance signal input channel is used to access resistance signals, and the frequency signal input channel is used to access frequency signals. Each signal input channel includes an aviation plug and a signal line and is connected to the respective switching matrix input end through the aviation plug.

[0033] A switching matrix module, wherein the input module is connected to the switching matrix module.

[0034] Further, as Figure 3 shown, the switching matrix module further includes:

[0035] The first-level switching matrix and the second-level switching matrix; the first-level switching matrix includes switching sub-matrices 1a, 1b, 1c, and 1d, where each switching sub-matrix is a relay array composed of K standard relays; the second-level switching matrix is a relay array composed of a voltage relay, a current relay, a resistance relay, and a frequency relay; wherein, the positive and negative poles of the output end of the switching sub-matrix 1a are connected to the positive and negative poles of the input end of the voltage relay, the positive and negative poles of the output end of the switching sub-matrix 1b are connected to the positive and negative poles of the input end of the current relay, the positive and negative poles of the output end of the switching sub-matrix 1c are connected to the positive and negative poles of the input end of the resistance relay, and the positive and negative poles of the output end of the switching sub-matrix 1d are connected to the positive and negative poles of the input end of the frequency relay.

[0036] Further, as Figure 4 shown, in the switching matrix module, the positive and negative poles of the output ends of the K-channel voltage signal input channels are mapped and connected to the positive and negative poles of the input ends of the K standard relays in the switching sub-matrix 1a; the positive and negative poles of the output ends of the K-channel current signal input channels are mapped and connected to the positive and negative poles of the input ends of the K standard relays in the switching sub-matrix 1b; the positive and negative poles of the output ends of the K-channel resistance signal input channels are mapped and connected to the positive and negative poles of the input ends of the K standard relays in the switching sub-matrix 1c; the positive and negative poles of the output ends of the K-channel frequency signal input channels are mapped and connected to the positive and negative poles of the input ends of the K standard relays in the switching sub-matrix 1d.

[0037] Optionally, the switching matrix module of the present application is connected to the input module, and under the control of a control signal, it can realize the one-out-of-many selection output of multiple input signals. For each group of switching matrices, its input end is K input channels of a certain electrical signal. The switching matrix is a two-in-two-out relay array. The output of the relay with a control end input of 0 is disconnected, and only the output of the relay with a control end input of 1 is connected to the input end. The use of a two-in-two-out relay array makes the device suitable for electrical signals that are not grounded. Exemplarily, for the case of 8 input signals, a control word of 1 byte can be used to achieve 8-to-1 selection. For example: input binary 00000001 to the control end of the switching matrix, then the signal of channel 1 is selected and connected to the output end; input binary 00010000, then the 5th channel is selected and connected to the output end.

[0038] Moreover, the switching matrix module is a two-stage switching matrix module, including a first-stage switching matrix and a second-stage switching matrix. Among them, the first-stage switching matrix includes switching sub-matrix 1a, switching sub-matrix 1b, switching sub-matrix 1c, and switching sub-matrix 1d. Each switching sub-matrix is a relay array composed of K standard relays. The first-stage switching matrix is located on the input channels of electrical quantities such as current, voltage, resistance, and frequency, and realizes the channel selection of a certain type of input signal. For example, the voltage selects the second channel, and the current selects the bottom channel, etc. Among them, each switching sub-matrix is a relay array composed of K two-in-two-out relays (double-pole single-throw switches). The positive and negative poles of its K input terminals are connected to the positive and negative poles of the output terminals of the K input channels of the aforementioned certain electrical signal. The signal connection schematic diagram is as Figure 4 shown. The positive and negative poles of the output terminals of the K-channel voltage signal input channels are mapped and connected to the positive and negative poles of the input terminals of the K standard relays in switching sub-matrix 1a; the positive and negative poles of the output terminals of the K-channel current signal input channels are mapped and connected to the positive and negative poles of the input terminals of the K standard relays in switching sub-matrix 1b; the positive and negative poles of the output terminals of the K-channel resistance signal input channels are mapped and connected to the positive and negative poles of the input terminals of the K standard relays in switching sub-matrix 1c; the positive and negative poles of the output terminals of the K-channel frequency signal input channels are mapped and connected to the positive and negative poles of the input terminals of the K standard relays in switching sub-matrix 1d.

[0039] The second-stage switching matrix is located after the first-stage switching matrix and before the multi-functional multimeter card. It is a relay array composed of a voltage relay, a current relay, a resistance relay, and a frequency relay. Its input is the output signal of the first-stage switching matrix, that is, each of the electrical quantities of current, voltage, resistance, and frequency outputs a signal to the input terminal of the second-stage switching matrix. Under the control of the switching control module, the second-stage switching matrix selects a signal and inputs it to the input terminal of the multimeter card. Among them, the signal connection relationship of switching matrix 2 is similar to Figure 4 that. The positive and negative poles of the output terminal of switching sub-matrix 1a are connected to the positive and negative poles of the input terminal of the voltage relay; the positive and negative poles of the output terminal of switching sub-matrix 1b are connected to the positive and negative poles of the input terminal of the current relay; the positive and negative poles of the output terminal of switching sub-matrix 1c are connected to the positive and negative poles of the input terminal of the resistance relay; the positive and negative poles of the output terminal of switching sub-matrix 1d are connected to the positive and negative poles of the input terminal of the frequency relay.

[0040] Multimeter card, the switching matrix module is connected to the multimeter card.

[0041] It should be understood that the multimeter card of the present application is connected to the switching matrix module. For the convenience of connecting to an embedded computer and measuring and reading data, a multi-functional multimeter card with a USB interface can be selected to realize the measurement of current, voltage, resistance, and frequency signals.

[0042] Among them, the main technical indicators of the multimeter card are as follows:

[0043]

[0044]

[0045] An embedded computer, and the multimeter card is connected to the embedded computer. As Figure 5 shown, the embedded computer is connected to the switching control module through an RS232 interface.

[0046] Specifically, the embedded computer of the present application is connected to the multimeter card, and a small embedded industrial control computer is used, which has a USB interface for communicating with the multimeter card and an RS232 interface for communicating with the switching matrix control module. Control is run on the embedded computer, and mainly the following four functions are completed: 1. Conduct measurement process control, send control instructions to the switching control module, and control the two-stage switching matrix to complete the signal switching function; 2. Control the multimeter card to execute current, voltage, resistance, and frequency measurement functions; 3. Read the measurement data of the multimeter card; 4. After parsing the read data, store it in the database for subsequent further analysis and processing.

[0047] A switching control module, the switching matrix module and the embedded computer are respectively connected to the switching control module. Among them, the switching control module is connected to the first-stage switching matrix through an RS232 interface. The switching control module is connected to the second-stage switching matrix through an RS232 interface.

[0048] Further, the embedded computer generates and sends control instructions, the switching control module receives and decodes the control instructions to generate a control word, the switching matrix module performs multiple selection on the multiple input signals of the multiple signal input channels in the input module according to the control word and sends the selected signal to the multimeter card, the multimeter card measures the selected signal, and returns the measurement result to the embedded computer.

[0049] Optionally, the switching control module of the present application is respectively connected to the switching matrix module and the embedded computer, including being connected to the first-stage switching matrix of the switching matrix module and the switching matrix module through an RS232 interface.

[0050] The specific control process may be that the embedded computer generates and sends control instructions, the switching control module receives the control instructions sent by the embedded computer, decodes the control instructions to generate a control word, and the switching matrix module performs multi - select - one on the multiple input signals of the multiple signal input channels in the input module according to the control word and sends the selected signal to the multimeter card. Exemplarily, the switching control module controls the two - stage switching matrix of the switching matrix module to connect the selected signal type and channel to the multimeter card, and according to the electrical quantity measurement channel control instruction selected by the user or controlled by the program, after decoding, sends a control word to the first - stage switching matrix through the RS232 interface, and according to the electrical quantity measurement type control instruction selected by the user or controlled by the program, after decoding, sends a control word to the second - stage switching matrix through the RS232 interface. Finally, the multimeter card measures the selected signal and sends the measurement result back to the embedded computer.

[0051] The device provided by the embodiment of the present application has at least the following technical effects or advantages:

[0052] A multi - electrical - quantity data acquisition device based on a multimeter card provided by an embodiment of the present application includes: an input module, a switching matrix module, a multimeter card, an embedded computer, and a switching control module. The embedded computer generates and sends control instructions, the switching control module receives and decodes the control instructions to generate a control word, the switching matrix module performs multi - select - one on the multiple input signals of the multiple signal input channels in the input module according to the control word and sends the selected signal to the multimeter card, the multimeter card measures the selected signal and sends the measurement result back to the embedded computer, solving the technical problem that the existing data acquisition device has a high cost, a large volume, and is not easy to carry due to a large number of signal types and channels, and achieving the technical effect of realizing low - cost, small - volume, and portable electrical - quantity data acquisition based on a multi - functional digital multimeter card.

[0053] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0054] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and modifications.

Claims

1. A multi-meter card-based data acquisition device for various electrical quantities, characterized in that: The device comprises: An input module, wherein the input module comprises multiple signal input channels; A switching matrix module, wherein the input module is connected to the switching matrix module; A multimeter card, the switching matrix module is connected to the multimeter card; An embedded computer, the multimeter card is connected to the embedded computer; A switching control module, the switching matrix module and the embedded computer are respectively connected to the switching control module; The embedded computer generates and sends a control instruction, the switching control module receives and decodes the control instruction to generate a control word, the switching matrix module selects one of the multiple input signals of the multiple signal input channels in the input module according to the control word and sends the selected signal to the multimeter card, the multimeter card measures the selected signal, and transmits the measurement result back to the embedded computer.

2. A device for collecting multiple electrical quantity data based on a multimeter card as claimed in claim 1, characterized in that: The input module comprises: K voltage signal input channels, K current signal input channels, K resistance signal input channels and K frequency signal input channels, wherein each signal input channel includes an aviation plug and a signal line, and K is a positive integer.

3. A multi-electric quantity data acquisition device based on a multimeter card as claimed in claim 2, characterized in that: The switching matrix module comprises: A first-level switching matrix and a second-level switching matrix; The first-level switching matrix includes a switching sub-matrix 1a, a switching sub-matrix 1b, a switching sub-matrix 1c, and a switching sub-matrix 1d, wherein each switching sub-matrix is ​​a relay array composed of K standard relays; The second-level switching matrix is ​​a relay array composed of voltage relays, current relays, resistance relays and frequency relays; Among them, the positive and negative poles of the output end of the switching sub-matrix 1a are connected to the positive and negative poles of the input end of the voltage relay, the positive and negative poles of the output end of the switching sub-matrix 1b are connected to the positive and negative poles of the input end of the current relay, the positive and negative poles of the output end of the switching sub-matrix 1c are connected to the positive and negative poles of the input end of the resistance relay, and the positive and negative poles of the output end of the switching sub-matrix 1d are connected to the positive and negative poles of the input end of the frequency relay.

4. A multi-electric quantity data acquisition device based on a multimeter card as claimed in claim 3, characterized in that: include: The positive and negative poles of the output terminals of the K voltage signal input channels are connected to the positive and negative poles of the input terminals of the K standard relays in the switching matrix 1a in a mapping manner; The positive and negative poles of the output terminals of the K current signal input channels are connected to the positive and negative poles of the input terminals of the K standard relays in the switching matrix 1b in a mapping manner; The positive and negative poles of the output terminals of the K-way resistor signal input channel are connected in a mapping manner to the positive and negative poles of the input terminals of the K standard relays in the switching matrix 1c; The positive and negative poles of the output terminals of the K frequency signal input channels are connected in a mapping manner to the positive and negative poles of the input terminals of the K standard relays in the switching sub-matrix 1d.

5. The device for collecting multiple electrical quantity data based on a multimeter card as claimed in claim 1, characterized in that: The embedded computer is connected to the switch control module via an RS232 interface.

6. A device for collecting multiple electrical quantity data based on a multimeter card as claimed in claim 1, characterized in that: The multimeter card is connected to the embedded computer via a USB interface.

7. A device for collecting multiple electrical quantity data based on a multimeter card as claimed in claim 3, characterized in that: The switching control module is connected to the first-level switching matrix via an RS232 interface.

8. A device for collecting multiple electrical quantity data based on a multimeter card as claimed in claim 7, characterized in that: The switching control module is connected to the second-level switching matrix via an RS232 interface.

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