CN213426171U

CN213426171U - Desk-top isolator intermodulation tester

Info

Publication number: CN213426171U
Application number: CN202022390232.6U
Authority: CN
Inventors: 吴雪; 朱斌; 李荣明; 唐静
Original assignee: Nanjing Rflight Communication Electronic Corp
Current assignee: Nanjing Rflight Communication Electronic Corp
Priority date: 2020-10-25
Filing date: 2020-10-25
Publication date: 2021-06-11
Anticipated expiration: 2030-10-25

Abstract

The utility model discloses a desk-top isolator intermodulation tester, including shielding machine case, emission module, receiving module, power module and display module, shielding machine case is by the upper cover plate, lower cover plate, first curb plate, the second curb plate, front panel and rear panel are constituteed, display module locates on the front panel, be equipped with the fixed plate between upper cover plate and the lower cover plate, be equipped with the shielded connection ware of gilding strap on the fixed plate, one side that the upper end of fixed plate is close to the front panel is equipped with upper strata division board, one side that the lower extreme of fixed plate is close to the front panel is equipped with lower floor's division board, all be equipped with the metal shielded connection ware on upper strata division board and the lower floor's division board, emission module and passive module are installed to the upper end of fixed plate, receiving module and control module are installed to the lower extreme of fixed plate, power module is all installed to the. The utility model discloses compact, the system integration degree is high, and the testing process is simple and convenient, easy operation.

Description

Desk-top isolator intermodulation tester

Technical Field

The utility model relates to a communication equipment technical field, more specifically say, in particular to desk-top isolator intermodulation tester.

Background

The intermodulation comprehensive tester of the passive isolator becomes a necessary tester for the production and the test of an isolator manufacturer. The common cabinet type isolator test system is designed by a split case, so that the electromagnetic environment interference is less. The system is easy to realize without considering too many interference factors. However, the split design is large in size, high in cost, time-consuming in system building, complex in system connecting cable, mostly used for research and development tests, and not suitable for production line tests. Therefore, it is necessary to develop a bench-type isolator intermodulation tester to solve the problems of the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a desk-top isolator intermodulation tester to overcome the defect that prior art exists.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a desk-top isolator intermodulation tester comprises a shielding case, a transmitting module, a receiving module, a power supply module and a display module, the shielding case consists of an upper cover plate, a lower cover plate, a first side plate, a second side plate, a front panel and a rear panel, the display module is arranged on the front panel, a fixed plate is arranged between the upper cover plate and the lower cover plate, a shielding connector of a gold-plated metal belt is arranged on the fixed plate, an upper isolation plate is arranged at one side of the upper end of the fixed plate close to the front panel, a lower isolation plate is arranged at one side of the lower end of the fixed plate close to the front panel, metal shielding connectors are arranged on the upper isolation plate and the lower isolation plate, the transmission module and the passive module are installed to the upper end of fixed plate, receiving module and control module are installed to the lower extreme of fixed plate, power module is all installed to the inboard of first curb plate and the inboard of second curb plate.

Furthermore, the first side plate is provided with first shielding heat dissipation holes, the second side plate is provided with second shielding heat dissipation holes, and the rear panel is provided with third shielding heat dissipation holes.

Further, the transmitting module comprises a signal source module and a linear power amplifier module.

Further, the receiving module comprises a spectrometer module.

Compared with the prior art, the utility model has the advantages of: the utility model provides a pair of desk-top isolator intermodulation tester, compact, the system integrated level is high, and the testing process is simple and convenient, easy operation. Compared with an instrument type, the cost is greatly reduced, and the diversified and modularized requirements of the market are met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an azimuth perspective view of the present invention of a desktop isolator intermodulation tester.

Fig. 2 is another perspective view of the present invention of a desktop isolator intermodulation tester.

In the figure: the high-power LED display panel comprises an upper cover plate 1, a lower cover plate 2, a first side plate 3, a second side plate 4, a front panel 5, a display module 6, a rear panel 7, an upper-layer isolation plate 8, a power module 9, a transmitting module and passive module 10, a fixing plate 11, a receiving module and control module 12, a shielding connector 13, a lower-layer isolation plate 14, a first shielding heat dissipation hole 31, a second shielding heat dissipation hole 41 and a third shielding heat dissipation hole 71.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.

Referring to fig. 1 and 2, the present embodiment discloses a desktop isolator intermodulation tester, which comprises a shielding case, a transmitting module, a receiving module, a power module 9 and a display module 6, wherein the shielding case is composed of an upper cover plate 1, a lower cover plate 2, a first side plate 3, a second side plate 4, a front panel 5 and a rear panel 7, the display module 6 is arranged on the front panel 5, a fixing plate 11 is arranged between the upper cover plate 1 and the lower cover plate 2, a gold-plated metal strip shielding connector 13 is arranged on the fixing plate 11, an upper layer isolating plate 8 is arranged on one side of the upper end of the fixing plate 11 close to the front panel 5, a lower layer isolating plate 14 is arranged on one side of the lower end of the fixing plate 11 close to the front panel 5, metal shielding connectors (USB3.0AA360 °) are arranged on the upper layer isolating plate 8 and the lower layer isolating plate 14, a shielding metal 5G communication port RJ adapter 45 socket is used for shielding metal stamping shielding EMI/, the compatibility and reliability of application are ensured, and the anti-interference performance is excellent.

The upper end of fixed plate 11 install emission module and passive module 10, receiving module and control module 12 are installed to the lower extreme of fixed plate 11, power module 9 is all installed to the inboard of first curb plate 3 and the inboard of second curb plate 4.

The shielding structure is characterized in that first shielding heat dissipation holes 31 are formed in the first side plate 3, second shielding heat dissipation holes 41 are formed in the second side plate 4, third shielding heat dissipation holes 71 are formed in the rear panel 7, the shielding heat dissipation holes mainly need to balance contradictions between ventilation and heat dissipation, when shielding requirements are considered, the array ventilation holes are formed in the metal plate through the perforated metal plate, and the maximum size of the holes and the depth of the holes are main factors influencing the shielding efficiency of the metal plate.

The utility model discloses because the inside unable wave filter that concatenates of isolator intermodulation system, the electromagnetism that high power amplifier produced is revealed and is disturbed can influence receiving module. Because the sensitivity of the receiver is very high, the signal receiving purity is influenced, the receiving module is doped with interference signals, the bottom noise level of the system is raised, and the intermodulation of the system is deteriorated. To shield or reduce such leakage, some absorbing material such as an absorber is attached for attenuation. However, the utility model discloses a receiving module and emission module separation design prevent signal mutual interference effectively, adopt the seamless design of draw-in groove concatenation between the fixed plate 11 of quick-witted case, guarantee the design of quick-witted incasement portion shielding. Interference signals are not required to be attenuated by using wave-absorbing materials, and the stability of the equipment is improved.

The transmitting module comprises a signal source module and a linear power amplifier module, the isolator intermodulation system adopts a signal source with low phase noise and low clutter, the phase noise can reach-135 dBc @1MHZ, and the phase noise of a common signal source can only reach-80 dBc @1 KHZ. The use of a signal source with low phase noise plays an important role in improving the system performance, and the system intermodulation can reach-125 dBm @ 43. The intermodulation value of the full-bandwidth isolator is tested, and due to the fact that the frequency range is wide, the system intermodulation test values are spaced at intervals of 1M, 2M, 5M and the like, clutter low energy of a signal source guarantees the system test requirements. And the common signal source does not have the high-precision requirement of clutter and phase noise, so the intermodulation of the test isolator system can not meet the index requirement of a user. In order to accurately measure harmonic distortion, a spectrally clean signal source and a spectrum analyzer need to be used. Harmonic distortion of the signal source and the dynamic range of the spectrum analyzer are important factors affecting the quality of the measurement. And the signal source module with the conventional requirement cannot meet the intermodulation test requirement of the isolator.

The receiving module comprises a frequency spectrograph module, covers the frequency of 30MHZ-6GHZ, is an ultra-compact all-in-one module/probe based on a USB3.0 interface and high-speed FPGA signal processing, and has a dynamic range of 90dB to meet the test requirement of an isolator intermodulation test system.

The utility model provides an including signal source module and power amplifier module among the emission module, passive module contains electric bridge closes way module, load module, coupler module, and receiving module contains the frequency spectrograph module, and control module contains control mainboard and central processing unit, and the relation of connection between the module is prior art (like the hypomere expression), and prior art's module can also be chooseed for use to each module, the utility model discloses a main inventive point lies in the desk-top structural design of figure 1 and figure 2.

The output ports of the two signal source modules are respectively connected with the input ports of the two power amplification modules in series, and the output ports of the two power amplification modules are connected with the two input ports of the bridge combining module in series; the other input port of the bridge combiner module is connected with a power load to absorb power, the other output port of the bridge combiner module is connected with an input port of a tested piece in series, an output port of the tested piece is connected with an input port of the coupler in series, an output port of the coupler is connected with the power load in series, a coupling port of the coupler is connected with the spectrometer module, and the spectrometer module analyzes fundamental wave signals F1 and F2 and third-order intermodulation signals 2F1-F2 and 2F2-F1 of the tested piece, analyzes analog signals, and performs FPGA signal processing and operation to obtain an intermodulation value of the tested piece. The system intermodulation value can reach below-85 dBc (3rd IM)/43 dBm.

The utility model discloses compare with ordinary cabinet type isolator intermodulation appearance, have following advantage:

1. adopt shielding machine case (6U) design, reduced the complexity of test, because shielding performance is good, the inside interference of system reduces, and machine incasement portion all adopts the modular design, easily dismantles and maintains, has improved maneuverability and efficiency of software testing, the large-scale production test of being convenient for.

2. Compared with a cabinet type isolator intermodulation instrument, the design of the integrated shielding case is adopted, system connecting cables are reduced, the system stability between modules is improved, and the influence of the cables on the residual intermodulation is reduced.

3. And the comprehensive receiver probe is adopted to replace a frequency spectrometer in a cabinet system, so that the volume is reduced, and the cost is reduced. The coverage frequency is 30MHZ-6GHZ, the ultra-compact all-in-one module/probe is based on a USB3.0 interface and high-speed FPGA signal processing, and the dynamic range can reach 90dB, so that the test requirement of an isolator intermodulation test system is met.

4. The power amplifier module of the intermodulation instrument of the desk-top isolator adopts a high-power design, and the output power of a port can reach +47 dBm. Compared with the conventional intermodulation meter design, only +44dBm can be achieved. The high-power design scheme can meet the test requirements of different powers of the isolator.

5. All wire passing holes and wire passing cables of the intermodulation instrument of the desk type isolator are designed by adopting shielding connectors, so that the best shielding performance is ensured. Adopt USB3.0AA360 metal shield connector, shielding metal 5G communication net gape adapter RJ45 socket, complete metal punching press shielding can fully keep apart EMI/RFI, has guaranteed the compatibility and the reliability of using, and the interference killing feature is excellent.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes and modifications can be made by the owner within the scope of the appended claims, and the protection scope of the present invention should not be exceeded by the claims.

Claims

1. The utility model provides a desk-top isolator intermodulation tester which characterized in that: including shielding machine case, emission module, receiving module, power module and display module, shielding machine case comprises upper cover plate, lower apron, first curb plate, second curb plate, front panel and rear panel, display module locates on the front panel, be equipped with the fixed plate between upper cover plate and the lower apron, be equipped with the shielded connector of gilding strap on the fixed plate, one side that the upper end of fixed plate is close to the front panel is equipped with the upper strata division board, and one side that the lower extreme of fixed plate is close to the front panel is equipped with lower floor's division board, all is equipped with the metallic shield connector on upper strata division board and the lower floor's division board, emission module and passive module are installed to the upper end of fixed plate, receiving module and control module are installed to the lower extreme of fixed plate, power module is all installed to the inboard of first curb plate and the inboard of second curb plate.

2. The bench isolator intermodulation tester of claim 1, wherein: the first side plate is provided with first shielding heat dissipation holes, the second side plate is provided with second shielding heat dissipation holes, and the rear panel is provided with third shielding heat dissipation holes.

3. The bench isolator intermodulation tester of claim 1, wherein: the transmitting module comprises a signal source module and a linear power amplifier module.

4. The bench isolator intermodulation tester of claim 1, wherein: the receiving module comprises a spectrometer module.