EVM test device

Abstract

The utility model provides an EVM (Error Vector Magnitude) test device. The EVM test device comprises a shell, a power supply device and a control device, the side wall of the shell is provided with an SMA interface used for being connected with a test system, an Ethernet interface used for being communicated with an upper computer of the test system, a USB interface used for being connected with the upper computer, a memory card interface used for being connected with a memory card in an inserted mode and a power interface. The control device is arranged in the shell; the power supply device is arranged in the shell and electrically connected with the control device, and the power supply device is used for being connected with an external power supply through the power interface. According to the utility model, the shell is provided with the SMA interface, the Ethernet interface, the USB interface, the memory card interface and the power supply interface, so that the EVM test equipment has different functions, and therefore, the equipment can test the communication performance of the EVM, can store test data, and is convenient to call, check and post-process the test data.

Description

Technical Field

[0001] The utility model relates to the technical field of carrier wireless dual-mode communication, in particular to an EVM testing device. Background Art

[0002] With the development of power line communication technology, the State Grid is promoting a dual-mode communication mode of high-speed power line carrier communication plus wireless communication. Wireless communication is added to the meter reading system as a new communication mode. According to the requirements of the State Grid's dual-mode communication interconnection technical specifications, it is necessary to test the wireless communication performance of the dual-mode communication chip. The wireless communication performance test includes wireless transmission performance test and wireless reception performance test. The wireless transmission performance test includes EVM performance test, transmission power spectrum density test, spurious radiation limit test, etc. The wireless reception performance test includes reception sensitivity performance test, anti-multipath interference test, anti-adjacent channel interference performance test, etc.

[0003] EVM (Error Vector Magnitude) refers to the error vector amplitude, which is the root mean square value of the ratio of the average error vector signal power to the average reference signal power. It is an indicator used to measure the performance of a digital modem, which reflects the degree of difference between the demodulator output signal and the ideal signal under the actual transmission environment. When testing EVM performance, professional test equipment is required, such as EVM test equipment, spectrum analyzer, vector signal analyzer, etc. The main purpose of EVM test equipment is to test the EVM communication performance of carrier wireless dual-mode communication chips. In addition, EVM test equipment can also be used in RF communication system performance testing, radio equipment performance testing and other fields. However, the interface function of existing EVM test equipment is single, and the test results can only be viewed in real time and cannot be saved locally. Utility Model Content

[0004] In view of this, the utility model proposes an EVM testing device, aiming to solve the problem in the prior art that the EVM testing device cannot save the test results.

[0005] The utility model proposes an EVM test device, which comprises: a shell, a power supply device and a control device; wherein the side wall of the shell is provided with an SMA interface for connecting to a test system, an Ethernet interface for communicating with a host computer of the test system, a USB interface for connecting to the host computer, a memory card interface for plugging in a memory card and a power supply interface; the control device is arranged in the shell; the power supply device is arranged in the shell and is electrically connected to the control device, and the power supply device is used to connect to an external power supply through the power supply interface.

[0006] Furthermore, in the above-mentioned EVM test equipment, the control device includes: a receiving unit and a processing unit; wherein the processing unit is electrically connected to the receiving unit, the host computer and the storage card.

[0007] Furthermore, in the above-mentioned EVM test equipment, the power supply device includes: two DC-DC modules; wherein, the two DC-DC modules are electrically connected to the control device, wherein one DC-DC module is used to provide 3.3V power supply, and the other DC-DC module is used to provide 2.5V power supply.

[0008] Furthermore, in the above EVM test device, the Ethernet interface and the USB interface are arranged at intervals on a first side wall of the shell, and the memory card interface is arranged on a second side wall of the shell opposite to the first side wall.

[0009] Furthermore, in the above-mentioned EVM testing device, the shell is in the shape of a rectangular parallelepiped, and the top wall of the shell is detachably connected to the side wall of the shell.

[0010] Furthermore, the above-mentioned EVM testing equipment also includes: four L-shaped first mounting seats; wherein each first mounting seat is respectively arranged at the four corners of the top wall of the shell, the first end of each first mounting seat is in contact with the top wall of the shell, and the second end of each first mounting seat is in contact with the side wall of the shell clamped between the first side wall and the second side wall, and each first mounting seat is connected to the shell by bolts.

[0011] Furthermore, in the above EVM testing device, the bottom wall of the shell is detachably connected to the side wall of the shell.

[0012] Furthermore, the above-mentioned EVM testing equipment also includes: four L-shaped second mounting seats; wherein each second mounting seat is respectively arranged at the four corners of the bottom wall of the shell, the first end of each second mounting seat is in contact with the bottom wall of the shell, the second end of each second mounting seat is in contact with the side wall of the shell clamped between the first side wall and the second side wall, and each second mounting seat is connected to the shell by bolts.

[0013] Furthermore, in the above EVM testing equipment, a top wall of the shell is provided with a plurality of heat dissipation openings.

[0014] Furthermore, in the above EVM testing device, two handles are arranged on the first side wall of the shell at intervals.

[0015] In the utility model, an SMA interface, an Ethernet interface, a USB interface, a memory card interface and a power supply interface are provided on the shell, so that the EVM test equipment can have different functions, which solves the problem of single interface function in the prior art. With such a configuration, the equipment can perform EVM performance test on the test signal sent by the test system, and send the test data to the host computer and the memory card, and the memory card stores the test data. In this way, not only the test of the EVM communication performance is realized, but also the test data can be stored, which is convenient for retrieving, viewing and post-processing the test data, and solves the problem that the EVM test equipment in the prior art cannot save the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0017] Figure 1 A schematic diagram of the structure of an EVM test device provided by an embodiment of the utility model;

[0018] Figure 2 A structural block diagram of an EVM test device provided in an embodiment of the utility model;

[0019] Figure 3 A 2-dimensional plan view of the mainboard of the EVM testing device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] See also Figures 1 to 3 , the figure shows the preferred structure of the EVM test device in this embodiment. As shown in the figure, the EVM test device includes: a housing 1, a power supply device and a control device 2. Among them, the side wall of the housing 1 is provided with an SMA interface 11, an Ethernet interface 12, a USB interface 13, a memory card interface 14 and a power supply interface 15. The SMA interface 11 is used to connect to the test system. Specifically, the test system is electrically connected to the SMA interface 11 through an SMA line.

[0022] The Ethernet interface 12 is used to communicate with the host computer 3 of the test system, and to control the EVM test equipment through the host computer 3 to perform EVM performance test.

[0023] The USB interface 13 is connected to the host computer 3 and is used to convert serial port communication and internal debugging, convert USB signals into serial port signals, and communicate with the EVM test equipment.

[0024] The memory card interface 14 is used to plug in the memory card 4. Specifically, the memory card 4 may be a TF card. Accordingly, the memory card interface 14 is a TF-CARD interface.

[0025] The Ethernet interface 12 and the USB interface 13 are arranged at intervals on a first side wall of the housing 1 , and the memory card interface 14 is arranged on a second side wall of the housing 1 , which is arranged opposite to the first side wall.

[0026] The shell 1 can be in the shape of a rectangular parallelepiped, and the SMA interface 11 and the power interface 15 can be arranged on two opposite side walls of the shell 1 clamped between the first side wall and the second side wall. Of course, the SMA interface 11 and the power interface 15 can also be arranged on the first side wall of the shell 1, and the SMA interface 11, the power interface 15, the Ethernet interface 12 and the USB interface 13 are arranged at intervals on the first side wall of the shell 1.

[0027] The control device 2 is arranged in the housing 1, and the control device 2 is used to receive the test signal sent by the test system, perform EVM performance test on the test signal, and send the test data to the host computer 3 and the memory card 4, and the memory card 4 is used to store the test data. Specifically, the control device 2 is electrically connected to the host computer 3 and the memory card 4. When the EVM test equipment is calibrated, the test system inputs the test signal through the SMA interface 11, and the host computer 3 reads the test signal input to the EVM test equipment through the Ethernet interface 12. The control device 2 receives the test signal, analyzes the test signal and calculates the EVM data. After the calculation is completed, the test data is uploaded to the host computer 3, and the test data is transmitted to the memory card 4 at the same time, and the memory card 4 stores the test data.

[0028] The control device 2 may include: a receiving unit and a processing unit. The receiving unit is used to receive a test signal, the processing unit is electrically connected to the receiving unit, the host computer 3 and the storage card 4, and the processing unit is used to analyze and calculate the test signal and send the calculated test data to the host computer 3 and the storage card 4.

[0029] The test signal has a preset power, which can be determined according to actual conditions, and this embodiment does not impose any restrictions on this. Preferably, the preset power is -30dBm to -25dBm. -30dBm to -25dBm is the optimal receiving power range of the internal receiver of the EVM test equipment.

[0030] In specific implementation, the host computer 3 reads the test signal power value input to the EVM test device through the Ethernet interface 12. The EVM test device listens on the RF receiving channel, parses the received message and calculates the EVM data. After the calculation is completed, the test data is uploaded to the host computer 3.

[0031] The power supply device is disposed in the housing 1 , and is electrically connected to the control device 2 . The power supply device is used to connect to an external power source via a power interface 15 .

[0032] Preferably, the power supply device includes: two DC-DC modules. The two DC-DC modules are both electrically connected to the control device 2, one DC-DC module is used to provide a 3.3V power supply, and the other DC-DC module is used to provide a 2.5V power supply. Specifically, the two DC-DC modules are used to power the integrated circuits and chips in the control device. Since the power supply voltages of the integrated circuits and chips are different, the two DC-DC modules provide a 3.3V power supply and a 2.5V power supply respectively.

[0033] It can be seen that in this embodiment, the shell 1 is provided with an SMA interface 11, an Ethernet interface 12, a USB interface 13, a memory card interface 14 and a power supply interface 15, so that the EVM test equipment can have different functions, which solves the problem of single interface function in the prior art. With such a configuration, the device can perform an EVM performance test on the test signal sent by the test system, and send the test data to the host computer 3 and the memory card 4, and the memory card 4 stores the test data. In this way, not only the test of the EVM communication performance is realized, but also the test data can be stored, which is convenient for retrieving, viewing and post-processing the test data, and solves the problem that the EVM test equipment in the prior art cannot save the test results.

[0034] See also Figures 1 to 3 In the above embodiment, the host computer 3 is used to send a call instruction to the control device 2. The control device 2 is also used to call the test data in the storage card 4 according to the call instruction, and send the called test data to the host computer 3. Specifically, the test data is stored in the storage card 4, and the host computer 3 can view and call the test data through the Ethernet interface 12.

[0035] In specific implementation, the memory card interface 14 is used to expand and deepen the application function and store device programs. The memory card interface 14 can store the test data of the EVM test device and post-process the test data through the deepening application program.

[0036] In the above embodiments, the host computer 3 is also used to send debugging instructions to the control device 2. The control device 2 is also used to control the internal program for maintenance and debugging according to the debugging instructions. Specifically, the USB interface 13 is used to perform real-time debugging and equipment calibration on the EVM test equipment. The host computer 3 is connected through the USB interface 13 to perform maintenance and debugging on the internal program of the EVM device. In this way, the EVM test equipment is debugged in real time through the host computer 3, and the online debugging of the EVM test equipment is realized, which is simple to operate.

[0037] In the above embodiments, the housing 1 is in a rectangular parallelepiped shape, and two handles are provided at intervals on the first side wall of the housing 1 to facilitate the staff to operate the EVM test equipment.

[0038] The top wall of the shell 1 is detachably connected to the side wall of the shell 1 , so that when repairing or maintaining, the top wall of the shell 1 can be removed to facilitate the repair of the internal structure of the shell 1 .

[0039] Preferably, the EVM test equipment also includes: four first mounting seats. Each of the first mounting seats is L-shaped. The top wall of the shell 1 is rectangular, and each first mounting seat is respectively arranged at the four corners of the top wall of the shell 1. The first end of each first mounting seat is parallel to and in contact with the top wall of the shell 1, and the second end of each first mounting seat is in contact with the side wall of the shell 1 sandwiched between the first side wall and the second side wall, and each first mounting seat is connected to the shell 1 by bolts. Specifically, the side wall of the shell 1 includes: a first side wall, a second side wall, and two opposite side walls sandwiched between the first side wall and the second side wall, and these two side walls can be respectively recorded as the third side wall and the fourth side wall. The second ends of the two first mounting seats are parallel to and in contact with the third side wall, and at the same time, the two first mounting seats are parallel to each other. The second ends of the other two first mounting seats are parallel to and in contact with the fourth side wall, and at the same time, the two first mounting seats are also parallel to each other. The positions of the four first mounting seats are relatively arranged. The first end of each first mounting seat is connected to the top wall of the shell 1 by bolts, the second ends of two first mounting seats are connected to the third side wall by bolts, and the second ends of the other two first mounting seats are connected to the fourth side wall by bolts.

[0040] Preferably, the bottom wall of the shell 1 is detachably connected to the side wall of the shell, so as to facilitate the repair or maintenance of the internal structure of the shell 1.

[0041] More preferably, the EVM test equipment also includes: four second mounting seats. Each of the second mounting seats is L-shaped. The bottom wall of the housing 1 is rectangular, and each second mounting seat is respectively arranged at the four corners of the bottom wall of the housing 1. The first end of each second mounting seat is parallel to and in contact with the bottom wall of the housing 1, and the second end of each second mounting seat is in contact with the side wall of the housing 1 sandwiched between the first side wall and the second side wall, and each second mounting seat is connected to the housing 1 by bolts. Specifically, the second ends of two of the second mounting seats are parallel to and in contact with the third side wall, and at the same time, the two second mounting seats are parallel to each other. The second ends of the other two second mounting seats are parallel to and in contact with the fourth side wall, and at the same time, the two second mounting seats are also parallel to each other. The positions of the four second mounting seats are all arranged relative to each other. The first end of each second mounting seat is connected to the bottom wall of the housing 1 by bolts, and the second ends of two of the second mounting seats are connected to the third side wall by bolts, and the second ends of the other two second mounting seats are connected to the fourth side wall by bolts.

[0042] Preferably, a plurality of heat dissipation openings are provided on the top wall of the housing 1 to reduce the temperature of the EVM test equipment.

[0043] In summary, in this embodiment, the shell 1 is provided with an SMA interface 11, an Ethernet interface 12, a USB interface 13, a memory card interface 14 and a power supply interface 15, so that the EVM test equipment can have different functions, which solves the problem of single interface function in the prior art. With such a configuration, the device can perform EVM performance test on the test signal sent by the test system, and send the test data to the host computer 3 and the memory card 4, and the memory card 4 stores the test data. In this way, not only the test of the EVM communication performance is realized, but also the EVM test equipment can be debugged online, and the test data can be stored, which is convenient for retrieving, viewing and post-processing the test data.

[0044] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0045] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An EVM test device, characterized in that: include: A housing (1), a power supply device and a control device (2); wherein: The side wall of the housing (1) is provided with an SMA interface (11) for connecting to a test system, an Ethernet interface (12) for communicating with a host computer (3) of the test system, a USB interface (13) for connecting to the host computer (3), a memory card interface (14) for plugging in a memory card (4), and a power interface (15); The control device (2) is arranged in the housing (1); The power supply device is arranged in the housing (1) and is electrically connected to the control device (2); the power supply device is used to connect to an external power supply via the power supply interface (15).

2. The EVM test equipment according to claim 1, characterized in that: The control device (2) comprises: a receiving unit and a processing unit; wherein: The processing unit is electrically connected to the receiving unit, the host computer (3) and the storage card (4).

3. The EVM test equipment according to claim 1, characterized in that: The power supply device comprises: two DC-DC modules; wherein, The two DC-DC modules are both electrically connected to the control device, wherein one DC-DC module is used to provide a 3.3V power supply, and the other DC-DC module is used to provide a 2.5V power supply.

4. The EVM test equipment according to claim 1, characterized in that: The Ethernet interface (12) and the USB interface (13) are arranged at intervals on a first side wall of the housing, and the memory card interface (14) is arranged on a second side wall of the housing opposite to the first side wall.

5. The EVM test equipment according to claim 4, characterized in that: The shell (1) is in the shape of a rectangular parallelepiped, and the top wall of the shell (1) is detachably connected to the side wall of the shell.

6. The EVM test equipment according to claim 5, characterized in that: Also includes: Four L-shaped first mounting seats; wherein, Each of the first mounting seats is respectively arranged at the four corners of the top wall of the shell (1); the first end of each of the first mounting seats is in contact with the top wall of the shell (1); the second end of each of the first mounting seats is in contact with the side wall of the shell (1) sandwiched between the first side wall and the second side wall; and each of the first mounting seats is connected to the shell (1) by bolts.

7. The EVM test equipment according to claim 5, characterized in that: The bottom wall of the shell (1) is detachably connected to the side wall of the shell.

8. The EVM test equipment according to claim 7, characterized in that: Also includes: Four L-shaped second mounting seats; wherein, Each of the second mounting seats is respectively arranged at the four corners of the bottom wall of the shell (1); the first end of each of the second mounting seats is in contact with the bottom wall of the shell (1); the second end of each of the second mounting seats is in contact with the side wall of the shell (1) sandwiched between the first side wall and the second side wall; and each of the second mounting seats is connected to the shell (1) by bolts.

9. The EVM test equipment according to claim 1, characterized in that: The top wall of the housing (1) is provided with a plurality of heat dissipation openings.

10. The EVM test equipment according to claim 4, characterized in that: Two handles are arranged at intervals on the first side wall of the housing (1).

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