Data synchronization method and device for multi-device cooperative collection

Abstract

The application provides a data synchronization method and device for multi-device cooperative collection, and belongs to the technical field of automobile testing. The synchronization method comprises the following steps: a step voltage signal is sent to all data collection devices participating in collection through a general hardware trigger module; each data collection device receives and records the step voltage signal through an analog voltage channel; the original data collected by each data collection device is subjected to time axis resetting with the moment when the step voltage signal reaches a preset voltage threshold as a time zero point; the data obtained after resetting is resampled at the same sampling frequency, and the data length is aligned, so that the multi-device data is synchronized and aligned. The step voltage signal is sent through the general hardware trigger module, and the starting moment of collection of each device is unified; meanwhile, the time deviation of data collection is solved by data resampling of software, the data collected by collection devices of different brands and models is synchronized and aligned, and high-precision and high-reliability cooperative collection is realized.

Description

Technical Field

[0001] This application belongs to the field of automotive testing technology, specifically relating to a data synchronization method and apparatus for multi-device collaborative acquisition. Background Technology

[0002] In the field of automotive R&D and testing, different types of tests have significantly different data acquisition requirements. Some critical tests, such as vehicle load spectrum acquisition and temperature field testing, often require dozens or even hundreds of data channels to complete comprehensive acquisition due to the large number of physical quantities that need to be monitored; while most tests only require a few core channels to meet the data acquisition requirements.

[0003] Currently, the industry generally adopts two solutions to address the above problems: one is to configure integrated data acquisition equipment with a high number of channels; the other is to combine multiple low-channel data acquisition equipment for acquisition. Although the former solution can meet the acquisition requirements of a high number of channels, the equipment purchase cost is high, and "channel idleness" is prone to occur in low-channel testing scenarios, resulting in wasted resources. The latter solution is more flexible, allowing for flexible combination of equipment according to actual testing needs, and achieving reasonable allocation of equipment resources when multiple projects are executed in parallel, thereby significantly improving equipment utilization.

[0004] However, the multi-device data acquisition model also brings new technical challenges. To balance cost and risk, companies typically select different brands and models of data acquisition equipment based on specific testing tasks. These devices have inherent differences in hardware interfaces and communication protocols, making it impossible for the data acquisition devices to acquire data synchronously. This can easily lead to a "timeline misalignment" phenomenon during data acquisition, directly affecting the accuracy of subsequent data correlation analysis.

[0005] Therefore, data synchronization has become a core pain point in multi-device collaborative data acquisition, essentially addressing the issues of "time base unification" and "data alignment" between different data acquisition devices. Existing solutions include some that use external hardware synchronizers to force clock unification across devices, but this method requires devices to support specific synchronization interfaces, resulting in limited compatibility; other solutions use timestamps for correction at the software level, but this requires synchronization calibration of device timestamps and is susceptible to factors such as network latency and device processing speed, making it difficult to guarantee synchronization accuracy and failing to meet the needs of high-precision testing scenarios.

[0006] In summary, how to achieve both compatibility with different brands and models of equipment and high-precision, high-reliability data synchronization and collaborative acquisition has become a pressing technical problem to be solved in this field. Summary of the Invention

[0007] The purpose of this application is to solve the problems existing in the prior art and provide a data synchronization method and device for multi-device collaborative acquisition, which can be compatible with different brands and models of devices and can achieve high-precision and high-reliability collaborative acquisition of data synchronization.

[0008] This application is achieved through the following technical solution: The first aspect of the invention provides a data synchronization method for collaborative data acquisition by multiple devices, the data synchronization method comprising: A step voltage signal is sent to all data acquisition devices participating in the acquisition through a general-purpose hardware trigger module; Each data acquisition device receives and records the step voltage signal through an analog voltage channel; The time axis of the raw data collected by each data acquisition device is reset at the moment when the step voltage signal reaches the preset voltage threshold. The data obtained after reset is resampled at the same sampling frequency and the data length is aligned to achieve synchronous alignment of data from multiple devices.

[0009] Preferably, the method for aligning data lengths includes: Based on the shortest data end time among all channels, trim the data of each channel to make them of uniform length.

[0010] Preferably, the rise rate of the step voltage signal is greater than or equal to the product of a preset voltage threshold and the sampling frequency.

[0011] Preferably, the preset voltage threshold is greater than or equal to 1 / 5 of the maximum value of the analog voltage channel range used to acquire the step voltage signal in each data acquisition device, and less than or equal to the range of the analog voltage channel of each data acquisition device.

[0012] A second aspect of this application provides a data synchronization device for multi-device collaborative data acquisition, comprising: A general-purpose hardware trigger module is used to send step voltage signals to all data acquisition devices; The data receiving module is used to receive the raw data containing the step voltage signal collected by each data acquisition device; The data processing module is used to reset the time axis of the original data with the time when the step voltage signal reaches a preset voltage threshold as the time zero point, and to resample and align the data obtained after the reset at the same sampling frequency.

[0013] Preferably, the general-purpose hardware triggering module includes: a vehicle power supply, a self-reset switch, multiple voltage divider resistors, a buzzer, an optocoupler relay, and an analog voltage output interface; The positive terminal of the vehicle power supply is connected in series with the self-reset switch and multiple voltage divider resistors. The positive terminal of the vehicle power supply is connected to the positive terminal of the buzzer and the positive terminal of the power input of the optocoupler relay via the self-reset switch. The self-reset switch is used to control the on / off state of the entire control circuit. The negative terminal of the buzzer and the negative terminal of the power input terminal of the optocoupler relay are both connected to the negative terminal of the vehicle power supply. The positive terminal of the optocoupler relay is connected between the first voltage divider resistor and the second voltage divider resistor; the negative terminal of the optocoupler relay is connected to the positive terminal of the analog voltage output interface.

[0014] The negative terminal of the vehicle power supply is connected to the negative terminal of the analog voltage output interface.

[0015] Preferably, in the test experiment, the data synchronization device is used such that the operating time of the optocoupler relay is less than or equal to the minimum sampling interval required by the test experiment.

[0016] Preferably, the data processing module is specifically used to take the moment when the step voltage signal reaches a preset voltage threshold as the zero point of time. The preset voltage threshold is greater than 1 / 5 of the maximum value of the analog voltage channel range used to acquire the step voltage signal in each data acquisition device, and less than or equal to the range of the analog voltage channel of each data acquisition device.

[0017] Preferably, the data processing module is further configured to save the data in a preset standardized file format after completing the resampling and alignment processing.

[0018] Preferably, the general-purpose hardware triggering module is connected to each data acquisition device via a splitter.

[0019] Compared with the prior art, the beneficial effects of this application are: this application sends a step voltage signal through a general hardware trigger module to unify the start time of data acquisition of each device; at the same time, it uses software data resampling to solve the time deviation of data acquisition, and corrects the data collected by multiple data acquisition devices of different brands, models and with different sampling rates and delay characteristics to a unified, high-precision time reference in the time dimension to achieve synchronous alignment, thereby realizing high-precision and high-reliability data synchronization and collaborative acquisition. Attached Figure Description

[0020] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0021] Figure 1 A flowchart illustrating a data synchronization method for collaborative data acquisition by multiple devices, provided in an embodiment of this application; Figure 2 This is a schematic diagram of a data synchronization device for multi-device collaborative acquisition provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a general-purpose hardware trigger module provided in an embodiment of this application; Figure 4 This is a schematic diagram illustrating the determination of the zero point of the trigger signal time provided in an embodiment of this application.

[0022] Explanation of reference numerals in the attached figures: 1-Vehicle power supply, 2-Self-reset switch, 31-First voltage divider resistor, 32-Second voltage divider resistor, 33-Third voltage divider resistor, 4-Buzzer, 5-Optocoupler relay, 6-Analog voltage output interface. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application more apparent, exemplary embodiments according to this application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. Based on the embodiments of this application described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of this application.

[0024] To address the issues of existing methods being incompatible with different brands and models of equipment and failing to meet synchronization accuracy requirements, this application proposes a data synchronization method and apparatus for multi-device collaborative acquisition. This method is compatible with different brands and models of equipment and enables high-precision, high-reliability collaborative data acquisition. The following is a further detailed description of this application with reference to the accompanying drawings.

[0025] To facilitate understanding of this application, please refer to the following: Figure 1 This application provides a detailed description of a data synchronization method for multi-device collaborative acquisition disclosed in the embodiments of this application.

[0026] Figure 1 This application provides a flowchart illustrating a data synchronization method for multi-device collaborative data acquisition, as shown in the embodiments below. Figure 1 As shown, the data synchronization method for multi-device collaborative acquisition in this application includes at least the following steps S100 to S400.

[0027] Step S100: Send a step voltage signal to all data acquisition devices participating in the acquisition through the general hardware trigger module.

[0028] Among them, the general hardware trigger module refers to an electronic device that is independent of a specific brand or model of data acquisition equipment. Its core function is to generate and output a step voltage signal with a fast rising edge, which is used to provide a physically near-simultaneous triggering start point for all connected acquisition devices.

[0029] A step voltage signal is an electrical signal in which the voltage value changes abruptly in a very short time. In this application, it specifically refers to a voltage pulse with an extremely short rise time (e.g., the rise is completed within milliseconds, with a rise rate of approximately ≥1000 V / s) and an approximately vertical waveform, whose steep rise edge is used to accurately mark time anchor points.

[0030] Step S200: Each data acquisition device receives and records the step voltage signal through the analog voltage channel.

[0031] The analog voltage channel refers to the physical input interface on the data acquisition device used to receive continuous voltage signals. This invention utilizes this channel to receive step voltage signals from a general-purpose hardware trigger module. Because this is the most common basic interface found in various data acquisition devices, the versatility of the solution is ensured.

[0032] Step S300: Using the moment when the step voltage signal reaches the preset voltage threshold as the time zero point, reset the time axis of the raw data collected by each data acquisition device.

[0033] The preset voltage threshold is a pre-defined voltage value used to accurately determine the arrival time of the step voltage signal during software processing. In a specific embodiment of the invention, this threshold is preferably greater than or equal to 1 / 5 of the maximum range of the analog voltage channel used to acquire the step voltage signal in each data acquisition device, and less than or equal to the range of the analog voltage channel of each data acquisition device, to ensure the response speed and acquisition accuracy of the step voltage signal. When the signal voltage reaches this value, it is recognized as the time zero point. This determination method has strong anti-interference ability and high accuracy. Time axis reset refers to shifting and converting the timestamp of the original data based on the newly determined "time zero point," so that the data of all devices have a unified and aligned start time reference system.

[0034] Specifically, when the step voltage signal reaches a preset voltage threshold, it serves as the new time origin. All data collected by all devices are time-aligned based on this point, thereby achieving absolute time synchronization across devices.

[0035] Step S400: Resample the data obtained after reset at the same sampling frequency and align the data length to achieve synchronous alignment of data from multiple devices.

[0036] Aligning data length refers to pruning all data channels after time axis reset and resampling to ensure they have the same time span. Typically, the shortest data length among all channels is used as the standard, truncating the excess portion at the end of longer channels to ensure all channel data are of equal length in the time dimension, facilitating subsequent matrix operations and joint analysis.

[0037] This application provides a data synchronization method for multi-device collaborative acquisition. It uses a general-purpose hardware trigger module to send a step voltage signal to unify the start time of acquisition for each device. Simultaneously, it utilizes software data resampling to resolve time discrepancies in data acquisition. Data collected from multiple acquisition devices of different brands, models, sampling rates, and latency characteristics are corrected in the time dimension to a unified, high-precision time benchmark, achieving synchronization and alignment. This enables high-precision, high-reliability collaborative acquisition, allowing for direct and accurate correlation and fusion analysis of this data. Furthermore, this method does not rely on a unified protocol synchronization scheme and can achieve cross-brand collaborative acquisition without replacing existing equipment, reducing equipment replacement costs and compatibility risks for enterprises.

[0038] This application also provides a data synchronization device for multi-device collaborative acquisition, used to implement the steps described in the above method embodiments. This device can be implemented as a standalone hardware device, or as a functional module integrated into a host computer, or deployed by combining dedicated software with general-purpose computing devices.

[0039] The following is for reference Figure 2 This application describes a data synchronization device for multi-device collaborative data acquisition provided in its embodiments. For example... Figure 2 As shown, the data synchronization device 100 includes the following modules.

[0040] The general-purpose hardware trigger module 110 is used to send step voltage signals to all data acquisition devices; the general-purpose hardware trigger module 110 may include a power supply unit, a signal generation unit and an output interface.

[0041] The data receiving module 120 is used to receive the raw data containing the step voltage signal collected by each data acquisition device. The data receiving module 120 can be implemented in one or more of the following ways, depending on the test scenario, equipment capabilities, and system architecture requirements: 1. Wired centralized reading method Each data acquisition device is directly connected to a host computer (such as an industrial laptop or server) equipped with the data processing module 130 via a standard data cable (such as an Ethernet cable or USB cable). The data receiving module 120 actively reads or receives data files transmitted from the device's memory using the communication protocol or driver provided by the device manufacturer.

[0042] 2. Wireless network transmission method Each data acquisition device has a built-in or external wireless module (such as a Wi-Fi or 4G / 5G module). During or after data acquisition, the device actively transmits the raw data, including the trigger signal, to the host computer equipped with the data processing module 130 via the wireless network. The data receiving module 120, acting as a service program on the host computer, continuously listens for and receives data streams or data packets from each device.

[0043] 3. Transfer method using mobile storage media Each data acquisition device stores data locally on removable storage media, such as Secure Digital Cards (SD), Compact Flash Cards (CF), or solid-state drives. After testing, operators physically remove the memory cards from each device and import them centrally to the host computer using a card reader. The data receiving module 120 is responsible for automatically scanning, identifying, and reading all imported data files from a designated local folder.

[0044] Ultimately, this module fully acquires raw data from different devices that may have heterogeneous formats (different sampling rates, encoding methods, and file formats) and passes it to subsequent processing modules.

[0045] The data processing module 130 is used to reset the time axis of the original data, taking the moment when the step voltage signal reaches a preset voltage threshold as the time zero point, and then resamples and aligns the reset data at the same sampling frequency. The data processing module 130 is the core software functional unit for completing data synchronization and alignment. It receives the original data from the data receiving module 120, executes a series of algorithmic operations, and finally outputs a time-synchronized and aligned multi-channel dataset.

[0046] This device employs a hybrid architecture that establishes a baseline through unified hardware triggering and achieves alignment through precise software processing. It effectively solves the data synchronization problem in collaborative acquisition across heterogeneous devices without relying on dedicated synchronization interfaces or protocols, and combines high precision, high compatibility, and high flexibility.

[0047] Next, refer to Figure 3 and Figure 4 This application describes a data synchronization method for multi-device collaborative data acquisition according to one embodiment. Figure 3 This is a schematic diagram of the structure of a general hardware trigger module provided in an embodiment of this application, as shown below. Figure 3 As shown, Figure 4 This is a schematic diagram illustrating the determination of the zero point of the trigger signal time provided in an embodiment of this application.

[0048] In automotive R&D and testing experiments (such as load spectrum acquisition and temperature field testing), this embodiment provides a general-purpose hardware trigger module to achieve synchronous start-up of multi-device acquisition. For example... Figure 3 As shown, this module mainly includes the following components: Onboard power supply 1 (12VDC) is used to provide operating voltage for the entire module; Self-reset switch 2 is used to manually trigger the synchronization signal; Three voltage divider resistors (3 with a resistance of 1kΩ) are used for current limiting and voltage division in the circuit. Buzzer 4 emits an audible alert when triggered; The optocoupler relay 5, whose operating time is no greater than the sampling interval required for the test (e.g., 2ms), is used to achieve electrical isolation and fast switching control; Analog voltage output interface 6 is used to output the generated step voltage signal to the analog input channel of each data acquisition device.

[0049] The positive terminal of the vehicle power supply 1 is connected in series with a self-reset switch 2, a first voltage divider resistor 31, a second voltage divider resistor 32, and a third voltage divider resistor 33. The positive terminal of the vehicle power supply 1 is connected to the positive terminal of the buzzer 4 and the positive terminal of the power input of the optocoupler relay 5 via the self-reset switch 2. The self-reset switch 2 is used to control the on / off state of the entire control circuit. The negative terminal of the buzzer 4 and the negative terminal of the power input of the optocoupler relay 5 are both connected to the negative terminal of the vehicle power supply 1. The positive terminal of the output of the optocoupler relay 5 is connected between the first voltage divider resistor 31 and the second voltage divider resistor 32. The negative terminal of the output of the optocoupler relay 5 is connected to the positive terminal of the analog voltage output interface 6. The negative terminal of the vehicle power supply 1 is connected to the negative terminal of the analog voltage output interface 6. It should be noted that the number and resistance value of the voltage divider resistors 3 and the operating time of the optocoupler relay 5 can be set according to the needs of the site. This application does not make specific limitations on their number and parameters.

[0050] The specific workflow of this module is as follows: a. Connection preparation: Connect the analog voltage output interface 6 of the general hardware trigger module in parallel to the analog voltage input channel of all data acquisition devices participating in the collaborative acquisition via a splitter.

[0051] b. Signal Triggering: After activating all data acquisition devices and placing them in a trigger-ready state, close the self-reset switch 2 of the hardware trigger module. At this time, the module's internal circuitry generates a step voltage signal with an extremely fast rise time (e.g., 1000V / s). The rise time of this step voltage signal is greater than or equal to the product of a preset voltage threshold and the sampling frequency to ensure a unified triggering time base. This signal serves as a physical time anchor signal and is sent almost simultaneously to all connected data acquisition devices via a splitter; it also drives the buzzer 4 to sound, providing tactile and auditory feedback to on-site operators. Subsequently, the self-reset switch 2 automatically resets.

[0052] c. Signal Recording: Each data acquisition device receives and records the step voltage signal in real time through its own analog voltage channel. Because the signal is transmitted in parallel via hardware circuitry, the signals received by each device are highly consistent in time, providing a precise hardware time reference for subsequent software synchronization.

[0053] After data acquisition, heterogeneous data from different devices is processed using specialized software to achieve time alignment and standardization. The specific steps are as follows: a. Zero-point calibration and data editing: The software reads the data recorded by each device and identifies the step voltage signal generated by the hardware trigger module. The precise moment when this step voltage signal reaches a preset voltage threshold (e.g., 1V) is used as a unified "time zero point" (the "time zero point" can be precisely located using methods such as linear interpolation or spline interpolation). Here, the preset voltage threshold is greater than or equal to 1 / 5 of the maximum range of the analog voltage channel used to acquire the step voltage signal in each data acquisition device, and less than or equal to the range of the analog voltage channel of each data acquisition device, to ensure the response speed and acquisition accuracy of the step voltage signal. This judgment criterion is clear and unambiguous, avoiding judgment errors caused by signal rise slope or noise. Starting from this "time zero point," the raw data of each device is edited, redundant data before triggering is removed, and this moment is reset as the zero point on the time axis.

[0054] like Figure 4 As shown, Figure 4 The horizontal axis represents time, measured in seconds (s); the vertical axis contains two types of data: one is the voltage value of the trigger signal, showing the rise of the step voltage signal; the other is the data value at the corresponding time point, reflecting the time correlation between the trigger signal and the acquired data. Figure 4 The time correspondence between hardware trigger signals and data acquisition is presented. The precise moment when the step voltage signal reaches the 1V voltage value, 60.945858s, is used as the unified "time zero point", providing a clear benchmark for synchronization steps such as resetting the time axis and resampling at the software level.

[0055] b. Data resampling: Based on the uniform sampling frequency required by the experimental analysis (e.g., 1000 Hz), the edited data from each device are resampled using interpolation algorithms (such as linear interpolation and spline interpolation).

[0056] This step unifies the data from all devices to the same time interval, resolving the data point time mismatch problem caused by different devices potentially operating at different sampling rates.

[0057] c. Standardized data length and formatted output: Compare the lengths of the resampled data arrays from all data channels (from all devices).

[0058] Using the shortest data channel's end time as a benchmark, all data channels longer than this benchmark are end-trimmed to ensure that the data duration of all channels is completely consistent.

[0059] Finally, the processed and time-synchronized multi-channel data is integrated and saved in a standardized data file format for subsequent joint analysis and processing.

[0060] Through the above-described implementation scheme combining hardware triggering and software processing, this embodiment achieves the following beneficial effects: High compatibility: By utilizing the most commonly used interface of analog voltage signals, it breaks down the barriers between different brands and models of data acquisition equipment in terms of digital communication protocols, and realizes true cross-platform collaborative data acquisition.

[0061] High synchronization accuracy: Parallel triggering at the hardware level ensures microsecond-level event synchronization start point; at the software level, zero-point calibration and resampling based on precise voltage thresholds (such as 1V) eliminate the cumulative errors caused by crystal drift, sampling delay and sampling frequency between devices, achieving high-precision alignment of overall data.

[0062] High flexibility and low cost: Enterprises do not need to purchase expensive high-channel integrated machines or equipment supporting specific synchronization protocols. They can flexibly build test systems that adapt to different channel number requirements simply by using existing equipment with the low-cost trigger module of this invention and existing software, significantly improving equipment utilization and return on investment. It can meet the needs of automotive testing scenarios with "coexistence of high and low channel numbers" and "multiple projects in parallel", providing technical support for the accuracy and reliability of automotive test data.

[0063] Finally, it should be noted that the above technical solution is only one implementation method of this application. For those skilled in the art, based on the application methods and principles disclosed in this application, it is easy to make various types of improvements or modifications, and not limited to the methods described in the specific implementation methods above. Therefore, the methods described above are only preferred and have no limiting significance.

Claims

1. A data synchronization method for multi-device cooperative collection, characterized in that, The data synchronization method includes: A step voltage signal is sent to all data acquisition devices participating in the acquisition through a general-purpose hardware trigger module; Each data acquisition device receives and records the step voltage signal through an analog voltage channel; The time axis of the raw data collected by each data acquisition device is reset at the moment when the step voltage signal reaches the preset voltage threshold. The data obtained after reset is resampled at the same sampling frequency and the data length is aligned to achieve synchronous alignment of data from multiple devices.

2. The data synchronization method for multi-device collaborative acquisition according to claim 1, characterized in that, Methods for aligning data lengths include: Based on the shortest data end time among all channels, trim the data of each channel to make them of uniform length.

3. The data synchronization method for multi-device collaborative acquisition according to claim 1, characterized in that, The rise rate of the step voltage signal is greater than or equal to the product of a preset voltage threshold and the sampling frequency.

4. The data synchronization method for multi-device collaborative acquisition according to claim 3, characterized in that, The preset voltage threshold is greater than or equal to 1 / 5 of the maximum value of the analog voltage channel range used to acquire the step voltage signal in each data acquisition device, and less than or equal to the range of the analog voltage channel of each data acquisition device.

5. A data synchronization device for multi-device collaborative acquisition, characterized in that, include: A general-purpose hardware trigger module is used to send step voltage signals to all data acquisition devices; The data receiving module is used to receive the raw data containing the step voltage signal collected by each data acquisition device; The data processing module is used to reset the time axis of the original data with the time when the step voltage signal reaches a preset voltage threshold as the time zero point, and to resample and align the data obtained after the reset at the same sampling frequency.

6. The data synchronization device for multi-device collaborative acquisition according to claim 5, characterized in that, The general-purpose hardware triggering module includes: vehicle power supply, self-reset switch, multiple voltage divider resistors, buzzer, optocoupler relay and analog voltage output interface; The positive terminal of the vehicle power supply is connected in series with the self-reset switch and multiple voltage divider resistors. The positive terminal of the vehicle power supply is connected to the positive terminal of the buzzer and the positive terminal of the power input of the optocoupler relay via the self-reset switch. The self-reset switch is used to control the on / off state of the entire control circuit. The negative terminal of the buzzer and the negative terminal of the power input terminal of the optocoupler relay are both connected to the negative terminal of the vehicle power supply. The positive terminal of the optocoupler relay is connected between the first voltage divider resistor and the second voltage divider resistor; the negative terminal of the optocoupler relay is connected to the positive terminal of the analog voltage output interface. The negative terminal of the vehicle power supply is connected to the negative terminal of the analog voltage output interface.

7. The data synchronization device for multi-device collaborative acquisition according to claim 6, characterized in that, The data synchronization device is used in the test, where the operating time of the optocoupler relay is less than or equal to the minimum sampling interval required by the test.

8. The data synchronization device for multi-device collaborative acquisition according to claim 5, characterized in that, The data processing module is specifically used to take the moment when the step voltage signal reaches a preset voltage threshold as the zero point of time. The preset voltage threshold is greater than 1 / 5 of the maximum value of the analog voltage channel range used to acquire the step voltage signal in each data acquisition device, and less than or equal to the range of the analog voltage channel of each data acquisition device.

9. The data synchronization device for multi-device collaborative acquisition according to claim 5, characterized in that, The data processing module is also used to save the data in a preset standardized file format after completing the resampling and alignment processing.

10. The data synchronization device for multi-device collaborative acquisition according to claim 5, characterized in that, The general-purpose hardware triggering module is connected to each data acquisition device via a splitter.

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