CN114384456A - Line impedance stabilization network calibration adapter - Google Patents
Line impedance stabilization network calibration adapter Download PDFInfo
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- CN114384456A CN114384456A CN202111531830.3A CN202111531830A CN114384456A CN 114384456 A CN114384456 A CN 114384456A CN 202111531830 A CN202111531830 A CN 202111531830A CN 114384456 A CN114384456 A CN 114384456A
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- bnc
- line impedance
- stabilization network
- impedance stabilization
- plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/28—Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The embodiment of the invention provides a line impedance stabilization network calibration adapter which is characterized by comprising a live wire connecting piece, a ground wire connecting piece, a BNC flange plate and an insulating plate; the chassis of the BNC flange plate is connected with the ground wire splicing piece in a welding mode, one end of the BNC flange plate is fixed on the insulating plate through a screw, and the BNC interface signal inner core of the BNC flange plate penetrates through the insulating plate to be connected with the live wire splicing piece in a welding mode; the live wire splicing piece is fixed on the insulating plate by using screws; the live contact is disconnected from the ground contact.
Description
Technical Field
The invention belongs to the technical field of radio calibration, and relates to a line impedance stabilization network calibration adapter.
Background
With the continuous development of electronic technology, the use of various electronic devices with different power outputs in large quantities leads to the generation of conducted electromagnetic interference in public power grids, which may cause the electronic devices or systems connected to the power grids to fail to work normally, and is especially important for measuring devices for measuring conducted interference noise of instruments. The artificial power supply network is one of important auxiliary devices in the current electromagnetic compatibility test and is also a key device for conducting interference measurement. The artificial power supply network is used to provide a specified impedance to the terminals of the device under test in the radio frequency range and to isolate the test circuit from unwanted radio frequency signals on the power supply, thereby coupling the disturbance voltage to the measurement receiver. There are two basic types of artificial power networks: a V-shape for coupling an asymmetric (V-terminal) voltage and a delta-shape for coupling a symmetric voltage and an asymmetric voltage, respectively. Wherein, the Line Impedance Stabilization Network (LISN) and the V-shaped artificial power supply network can be used alternatively.
The international commission on radio interference has designed various types of line impedance stabilization networks. Standard line impedances for different types of conducted interference voltage measurements are specified. The line impedance stabilization networks are all provided with three terminals: the test device comprises a power supply end connected with a power supply, a device end connected with a tested device and a disturbance output end connected with a test device. The equipment-end power supply interface of the line impedance stabilization network is of a wiring terminal type, a T-shaped rubber head thread screwing type and a screw type wiring terminal type.
Disclosure of Invention
The invention relates to a line impedance stabilization network calibration adapter, which is designed aiming at a line impedance stabilization network with a wiring terminal type equipment end power interface. The method aims to change a power interface of the equipment end into a BNC type interface required for measurement when a line impedance stabilization network with the equipment end power interface as a wiring terminal type is calibrated so as to meet the requirement of the interface of the measurement equipment.
The invention aims to provide a line impedance stabilization network calibration adapter, which comprises a live wire connecting piece, a ground wire connecting piece, a BNC flange plate and an insulating plate, wherein the live wire connecting piece is connected with the ground wire connecting piece; wherein the content of the first and second substances,
the base plate of the BNC flange plate is connected with the ground wire splicing piece in a welding mode, one end of the BNC flange plate is fixed on the insulating plate through a screw, and the BNC interface signal inner core of the BNC flange plate penetrates through the insulating plate to be connected with the live wire splicing piece in a welding mode;
the live wire splicing piece is fixed on the insulating plate by using screws;
the live contact is disconnected from the ground contact.
Preferably, a BNC port signal wire of the BNC flange plate is connected with a live wire splicing piece to ensure signal transmission; meanwhile, the BNC flange plate chassis is required to be connected with a ground wire connecting piece, so that the ground wire of the testing instrument is connected with the ground wire of the tested impedance matching stable network, and the ground potentials of the testing instrument and the ground wire are the same.
Preferably, the insulating plate is made of insulating plastic to fix the ground wire connecting piece, the BNC signal inner core wire and the live wire connecting piece.
Preferably, the live and/or ground lugs are slotted copper plates.
Preferably, the copper plate is made of copper sheet metal with good electric conductivity, and the copper plate can be matched with the insulating plate to ensure the stability of the fire wire column, the ground wire column and the BNC interface and can be used as a ground wire, so that the power supply interface is consistent with the BNC interface.
Preferably, the joints between the live wire connecting pieces and/or the ground wire connecting pieces are connected by screws, the live wire connecting pieces and the BNC signal inner core wire are connected by soldering tin, and the soldering tin is ensured to be fully contacted with equipment.
Preferably, a network analyzer is adopted to calibrate the line impedance stabilizing network voltage dividing coefficient of the line impedance stabilizing network calibration adapter.
Preferably, an impedance analyzer is used for calibrating the line impedance stabilizing network impedance of the line impedance stabilizing network calibration adapter.
The structure of the adapter used by the tested equipment end of the line impedance stabilization network plays a key role in calibrating the line impedance stabilization network, the port adapters are not matched, and high-frequency parasitic parameters such as equivalent series inductance, equivalent series resistance, equivalent parallel capacitance and the like appear at the interface, so that the calibration result is not good, and the accuracy of the line impedance stabilization network in measuring conducted noise is directly influenced. The standard mentions that the line impedance stabilization network connection must be low impedance and the T-connector must be as close as possible to the device under test port and ground terminal. The invention provides a line impedance stabilization network calibration adapter which is designed aiming at a line impedance stabilization network of a T-shaped rubber head threaded screwing type connecting port and a screw type wiring terminal power interface, has good compatibility aiming at the power interface and can reduce the problem of inaccurate calibration caused by high-frequency parasitic parameters due to the problems of unmatched calibration adapter interfaces and the like during calibration.
Drawings
Fig. 1, fig. 2(a), and fig. 2(b) are schematic diagrams of the type of the power interface at the dut end of the line impedance stabilizing network according to the present invention;
fig. 3(a), fig. 3(b), and fig. 4 are schematic diagrams of the type of the power interface at the dut end of the line impedance stabilizing network according to the present invention;
FIG. 5 is a schematic diagram of the line impedance stabilization network calibration adapter of the present invention;
FIG. 6 is a cross-sectional view of FIG. 5;
FIG. 7 is a schematic diagram of the impedance in a calibration line impedance stabilization network using the present invention;
FIG. 8 is a schematic diagram of a normalized calibration experiment performed on a line impedance stabilization network using the present invention;
FIG. 9 is a schematic diagram of the voltage division coefficient calibration of the line impedance stabilization network using the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 5 and 6, the line impedance stabilization network calibration adapter comprises a calibration adapter ground wire connecting piece 1, a fire wire connecting piece 2, an insulating plate 3, a BNC inner core wire 5 and a BNC flange plate 4.
The calibration adapter is formed by mutually overlapping an insulating plate 3, a ground wire connecting piece 1 and a live wire connecting piece 2, wherein the ground wire connecting piece 1 and the live wire connecting piece 2 are grooves with the same caliber on a copper sheet according to the diameter of a power supply wire column. The ground wire splicing sheet 1 is connected with the BNC flange plate 4 in a welding mode, one end of the ground wire splicing sheet is fixed on the insulating plate through screws, and the live wire splicing sheet 2 is fixed on the insulating plate through screws. The live wire connecting piece 2 is not connected with the ground wire connecting piece 1, and the BNC interface signal inner core wire is welded on the live wire connecting piece 2.
The specific size of the interface needs to be determined according to the size of the live wire terminal and the ground wire terminal of the actual impedance matching stabilizing network to be calibrated, and a comparison is made by taking NNBL8226(SCHWARZBECK) as an example, which is specifically shown as follows:
the aperture of the slot: 8.5mm (determined by the diameter of the live and ground terminals on the impedance matching stabilization network to be calibrated)
Distance between the fire wire connecting piece and the center of the opening groove on the ground wire connecting piece: 90mm (distance from the center B of the live wire terminal to the center A of the ground wire terminal)
The size can ensure that the interface and the impedance matching stabilizing network have enough contact area, thereby maximally reducing the influence of parasitic parameters caused by poor contact on the performance of the impedance matching stabilizing network.
side length of a BNC flange plate chassis: 25mm
Calibration adapter tab design: the calibration adapter splicing piece consists of a square insulating plate and two slotted copper plates, wherein the insulating plate is made of insulating plastics and used for fixing a ground wire splicing piece, a BNC signal inner core wire and a live wire splicing piece; the copper plate adopts copper sheet metal with good electric conductivity, the copper plate not only can be mutually matched with the insulating plate to ensure the stability of the fire wire column, the ground wire column and the BNC interface, and the ground wire splicing copper plate can also be used as a ground wire, so that the power supply interface is consistent with the BNC interface. The specific dimensions are as follows:
the insulating plate is long: 45mm
The width of the insulating plate: 28.5mm
Thickness of the insulating plate: 1.75mm
The length of the live wire connector: 45mm
The live wire splicing is wide: 28.5mm
Thickness of live wire tab: 2mm
The length of the ground wire connecting piece is as follows: 79mm
The ground wire tab is wide: 28.5mm
Ground wire tab thickness: 2mm
The junction all adopts the screw connection between the splicing, and the live wire splicing is connected with BNC signal internal core line with adopting soldering tin, will guarantee the abundant contact of soldering tin and equipment.
The line impedance stabilization network may be calibrated by a network analyzer and an impedance analyzer, as shown in fig. 7, 8, 9.
1. Calibration of line impedance stabilization network impedance
Setting the frequency of the impedance analyzer as the frequency range of the response of the impedance stabilizing network of the calibrated line, calibrating the impedance analyzer at the terminal of the connecting cable, connecting the instrument according to the figure 7, and directly measuring the impedance module value of the impedance stabilizing network of the line.
2. Calibration of line impedance stabilization network voltage division coefficient
And a three-way method is used for calibrating the voltage division coefficient of the line impedance stabilizing network. The instrument is connected as shown in fig. 8, a network analyzer is used for carrying out normalization calibration on the impedance stabilizing network of the line to be calibrated, and then the instrument is connected according to fig. 9 for carrying out the measurement of the voltage division coefficient. The method calibrates the voltage division coefficient of the line impedance stabilizing network by using a three-way method, and can reduce errors caused by impedance mismatching. The 10dB attenuator is used to reduce the reflection due to impedance mismatch, and thus reduce the measurement error.
The invention can ensure that the live wire connecting piece and the ground wire connecting piece are fully contacted with the line impedance stabilizing network, has good grounding, reduces the conditions of poor contact and the like caused by the mismatching of interfaces as much as possible, reduces the coupling parasitic component caused by the mismatching of the connecting ports, and improves the precision of the calibration of the line impedance stabilizing network.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such 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 such modifications and variations.
Claims (8)
1. A line impedance stabilization network calibration adapter is characterized by comprising a live wire connecting piece, a ground wire connecting piece, a BNC flange plate and an insulating plate; wherein the content of the first and second substances,
the base plate of the BNC flange plate is connected with the ground wire splicing piece in a welding mode, one end of the BNC flange plate is fixed on the insulating plate through a screw, and a BNC port signal wire of the BNC flange plate is connected with the live wire splicing piece;
the live wire splicing piece is fixed on the insulating plate by using screws;
the live contact is disconnected from the ground contact.
2. The line impedance stabilization network calibration adapter of claim 1, wherein the BNC interface signal core of the BNC flange is connected to the live wire tab by welding through the insulating plate, so as to ensure signal transmission; meanwhile, the chassis of the flange disc is connected with a ground wire splicing piece, so that the ground wire of the testing instrument is connected with the ground wire of the tested impedance matching stable network, and the ground potentials of the testing instrument and the ground wire are the same.
3. The line impedance stabilization network calibration adapter of claim 1, wherein the insulating plate is made of insulating plastic to fix the ground wire tab, the BNC signal inner core wire and the live wire tab.
4. The line impedance stabilization network calibration adapter of claim 1, wherein the ground and fire wire tabs are slotted copper plates.
5. The line impedance stabilization network calibration adapter of claim 4, wherein the copper plate is made of copper sheet metal with good electrical conductivity, the copper plate is not only matched with the insulation plate to ensure the stability of the fire wire column, the ground wire column and the BNC interface, but also used as the ground wire for the ground wire connection plate, so that the power supply interface is consistent with the BNC interface.
6. The line impedance stabilization network calibration adapter of claim 5, wherein the connection between the hot and ground connection tabs is by screws, and the hot connection tab is connected to the BNC signal inner conductor by solder, so as to ensure sufficient contact between the solder and the device.
7. The line impedance stabilization network calibration adapter of any one of claims 1-6, wherein a network analyzer is used to calibrate the line impedance stabilization network voltage division coefficient of the line impedance stabilization network calibration adapter.
8. A line impedance stabilization network calibration adapter as claimed in any one of claims 1 to 6, wherein an impedance analyzer is used to calibrate the line impedance stabilization network impedance of the line impedance stabilization network calibration adapter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111531830.3A CN114384456A (en) | 2021-12-14 | 2021-12-14 | Line impedance stabilization network calibration adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111531830.3A CN114384456A (en) | 2021-12-14 | 2021-12-14 | Line impedance stabilization network calibration adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114384456A true CN114384456A (en) | 2022-04-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111531830.3A Pending CN114384456A (en) | 2021-12-14 | 2021-12-14 | Line impedance stabilization network calibration adapter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114384456A (en) |
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2021
- 2021-12-14 CN CN202111531830.3A patent/CN114384456A/en active Pending
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