CN114690106A - Calibration method of radio frequency test tool - Google Patents
Calibration method of radio frequency test tool Download PDFInfo
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- CN114690106A CN114690106A CN202011644916.2A CN202011644916A CN114690106A CN 114690106 A CN114690106 A CN 114690106A CN 202011644916 A CN202011644916 A CN 202011644916A CN 114690106 A CN114690106 A CN 114690106A
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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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Abstract
The calibration method of the radio frequency test tool comprises a test instrument and a shielding box, wherein the test instrument is provided with a first signal interface and a second signal interface, a fixed table is arranged in the shielding box, a coupling plate is arranged on the fixed table, a first connecting point and a second connecting point are arranged on the side wall of the shielding box, the second signal interface is connected with the second connecting point through a third cable, and the second connecting point is connected with the coupling plate through a fourth cable. The calibration method comprises the following steps: measuring the line loss of the whole loop, measuring the line loss of the fifth cable, and measuring the line loss sum of the first cable and the second cable; and calculating the line loss of the radio frequency test tool. By adopting the calibration method, the calibration efficiency of the radio frequency test tool can be greatly improved, and meanwhile, the cost is greatly reduced.
Description
Technical Field
The invention relates to the field of electronic equipment production, manufacturing and testing, in particular to a calibration method of a radio frequency test tool.
Background
In the development and production process of radio frequency products, a step of testing relevant parameters (such as transmission power, frequency error, phase error, receiving sensitivity and the like) of the radio frequency products is indispensable. In the prior art, a comprehensive tester is used for detecting radio frequency indexes of radio frequency signals of products, and during detection, the comprehensive tester needs to be connected with the products through radio frequency lines, and the radio frequency lines are attenuated, so that during detection of the radio frequency indexes of the radio frequency signals of the products, the radio frequency lines need to be calibrated.
At present, the industry generally adopts a golden machine mode for calibration, wherein the golden machine is a product with various indexes and parameters adjusted to fixed optimal values, and when testing, the golden machine is connected with a comprehensive tester through a radio frequency line, and the radio frequency index of the golden machine is determined, so that the golden machine can be used as a standard to calibrate the radio frequency line and the comprehensive tester at the same time. The biggest disadvantages of this calibration approach are:
1) in the NPI stage, the gold machine generation is generally not performed in time, so that the production aging is obviously insufficient;
2) during the NPI phase, frequent replacement of the gold machines is often required, resulting in high development and production of finished products.
Disclosure of Invention
The invention aims to solve the technical problem of providing a calibration method of a radio frequency test tool, and aims to solve the problems of low efficiency and high cost of the NPI stage radio frequency test of the existing radio frequency product.
In order to solve the technical problems, the technical scheme adopted by the invention is to provide a calibration method of a radio frequency test tool, the radio frequency test tool comprises a test instrument and a shielding box, the test instrument is provided with a first signal interface and a second signal interface, a fixed table is arranged in the shielding box, a coupling plate is arranged on the fixed table, a first connecting point and a second connecting point are arranged on the side wall of the shielding box, the second signal interface is connected with the second connecting point through a third cable, and the second connecting point is connected with the coupling plate through a fourth cable; the calibration method comprises the following steps:
step S1, mounting equipment to be measured on the fixed platform, connecting the first signal interface with the first connecting point by using the first cable connection, connecting a fifth cable at one end of the equipment to be measured, connecting the fifth cable with the first cable by using a second cable, measuring the line Loss of the whole loop, and recording the measurement result as Loss 1;
step S2, measuring the line Loss of the fifth cable, and recording the measurement result as Loss 2;
step S3, separating the first cable from the first connection point, separating the third cable from the second signal interface, taking out the second cable, connecting two ends of the second cable to the end of the first cable and the second signal interface, respectively, measuring the line Loss sum of the first cable and the second cable, and recording the measurement result as Loss 3;
step S4, calculating the line loss of the radio frequency test tool according to the following formula: loss1-Loss2-Loss3, wherein Loss is the line Loss of the radio frequency test tool.
In the technical scheme, the line Loss of the radio frequency test tool can be obtained by measuring the line Loss1 of the whole loop, the line Loss2 of the fifth cable, and the line Loss and Loss3 of the first cable and the second cable in sequence through the steps and then calculating according to a formula, so that the radio frequency test tool can be quickly calibrated. The whole calibration process is simple in operation steps and easy to realize, most importantly, a gold machine is not needed, the calibration efficiency of the radio frequency test tool can be greatly improved, and meanwhile, the cost is greatly reduced.
In the calibration method of the radio frequency test tool, the equipment to be tested comprises a PCB, and an antenna matching element which are attached to the PCB.
In the calibration method of the radio frequency test tool, the test instrument is an RF test instrument.
In the calibration method of the radio frequency test tool, a first mounting cavity is arranged on the solid-state table, and the coupling plate is fixed in the first mounting cavity.
In the calibration method of the radio frequency test tool, a second installation cavity is arranged on the solid-state platform; in step S1, the step of "mounting the device under test on the fixing table" is to fix the device under test in the second mounting cavity.
In the calibration method of the radio frequency test tool, the fifth cable comprises a radio frequency wire and a radio frequency terminal.
The calibration method of the radio frequency test tool can at least achieve the following beneficial effects: the line Loss1 of the whole loop, the line Loss less 2 of the fifth cable and the line Loss sum Loss3 of the first cable and the second cable are measured in sequence through the steps, and then the line Loss less of the radio frequency test tool can be obtained through calculation according to a formula, so that the radio frequency test tool can be calibrated quickly. The whole calibration process is simple in operation steps and easy to realize, most importantly, a gold machine is not needed, the calibration efficiency of the radio frequency test tool can be greatly improved, and meanwhile, the cost is greatly reduced.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
fig. 1 is a schematic diagram of line connection when line loss of an entire loop is measured in a calibration method provided in an embodiment of the present invention;
fig. 2 is a schematic diagram of line connection when line losses of a first cable and a second cable are measured in a calibration method provided in an embodiment of the present invention;
fig. 3 is a flowchart illustrating steps of a calibration method according to an embodiment of the present invention.
The reference numerals in the detailed description illustrate:
| |
11 | |
12 |
| |
121 | |
122 |
| Fixing table | 111 | |
1111 |
| |
112 | Second connecting |
113 |
| |
13 | |
14 |
| |
15 | |
16 |
| Device under test | 2 | Fifth cable | 3 |
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The embodiment provides a calibration method of a radio frequency test tool.
To facilitate understanding of the calibration method provided in this embodiment, it is necessary to first describe the rf testing tool. Referring to fig. 1, the radio frequency test tool includes a test instrument 12 and a shielding box 11. The test instrument 12 is an RF test instrument 12, and here, an RF test instrument 12 with a model CMW500 is selected, and the test instrument 12 has a first signal interface 121 and a second signal interface 122, where the first signal interface 121 is a signal transmitting end, and the second signal interface 122 is a signal receiving end. The shielding box 11 is a hollow rectangular parallelepiped structure, and may be made of aluminum. A fixed platform 111 is arranged in the inner part of the device, and a coupling plate 1111 is arranged on the fixed platform 111. Here, the solid-state table is provided with a first mounting cavity and a second mounting cavity, and the coupling plate 1111 is fixed in the first mounting cavity. A first connection point 112 and a second connection point 113 are provided on a vertical side wall of the shielding box 11, and here, the first connection point 112 and the second connection point 113 are a first metal terminal and a second metal terminal penetrating through the side wall, respectively. The second signal interface 122 is connected to the second connection point 113 through a third cable 15, and the second connection point 113 is connected to the coupling plate 1111 through a fourth cable 16 disposed in the shielding box 11.
The second cable 14 connected to the first connection point 112, the first signal interface 121 and the first connection point 112 are connected by a first cable 13,
referring to fig. 1, a point indicated by a is an end of the second cable 14 connected to the fifth cable 3, a point indicated by B is an end of the fourth cable 16 connected to the coupling board 1111, a point indicated by C is an end of the third cable 15 connected to the second signal interface 122, and a point indicated by D is an end of the first cable 13 connected to the first signal interface 121. Referring to fig. 2, the calibration method provided in this embodiment includes the following steps:
step S1, referring to fig. 1, installing the device under test 2 on the fixed platform 111, connecting the first signal interface 121 with the first connection point 112 by using the first cable 13, connecting a fifth cable 3 at one end of the device under test 2, and connecting the fifth cable 3 with the first cable 13 by using the second cable 14, so that the line Loss of the whole loop can be measured, and the measurement result is recorded as Loss 1;
step S2, measuring the line Loss of the fifth cable 3, and recording the measurement result as Loss 2; here, we measure the line loss of the fifth cable 3 using methods commonly used in the art;
step S3, referring to fig. 2, of separating the first cable 13 from the first connection point 112, separating the third cable 15 from the second signal interface 122, taking out the second cable 14, and then connecting both ends of the second cable 14 to the terminal of the first cable 13 and the second signal interface 122, respectively, so as to measure the sum of the line Loss of the first cable 13 and the second cable 14, and recording the measurement result as Loss 3;
step S4, calculating the line loss of the radio frequency test tool according to the following formula: loss1-Loss2-Loss3, wherein Loss is the line Loss of the radio frequency test tool. In fact, the line Loss of the rf testing tool is the sum of the line Loss between the device under test 2 and the coupling plate 1111, the line Loss of the third cable 15, and the line Loss of the fourth cable.
In the step S1, the device under test 2 includes a PCB board, and an antenna matching element attached to the PCB board. The device under test 2 is fixed in the second mounting cavity on the fixed table 111.
In the step S2, the fifth cable 3 includes a radio frequency line and a radio frequency terminal, which are, of course, matched with the antenna.
By adopting the calibration method provided by the embodiment, the line Loss of the radio frequency test tool can be obtained by measuring the line Loss1 of the whole loop, the line Loss of the fifth cable 2 and the line Loss and Loss3 of the first cable and the second cable in sequence through the steps and then calculating according to a formula, so that the radio frequency test tool can be calibrated quickly. The whole calibration process is simple in operation steps and easy to realize, most importantly, a gold machine is not needed, the calibration efficiency of the radio frequency test tool can be greatly improved, and meanwhile, the cost is greatly reduced.
In addition, the fixed station 111 is provided with a first installation cavity and a second installation cavity which are adjacent to each other, the coupling plate 1111 and the device to be measured 2 are respectively fixed in the first installation cavity and the second installation cavity, so that it can be ensured that the relative positions of the coupling plate 1111 and the device to be measured 2 are not changed in the measurement process, and the measurement result is accurate and reliable.
In some other embodiments, the RF test instrument 12 may be of another type, so long as an instrument having RF transmit/receive functionality is selected.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. The calibration method of the radio frequency test tool is characterized by comprising a test instrument (12) and a shielding box (11), wherein the test instrument (12) is provided with a first signal interface (121) and a second signal interface (122), a fixed table (111) is arranged in the shielding box (11), a coupling plate (1111) is installed on the fixed table (111), a first connection point (112) and a second connection point (113) are arranged on the side wall of the shielding box (11), the second signal interface (122) is connected with the second connection point (113) through a third cable (15), and the second connection point (113) is connected with the coupling plate (1111) through a fourth cable (16); the calibration method comprises the following steps:
step S1, mounting a device to be measured (2) on the fixed station (111), connecting the first signal interface (121) with the first connecting point (112) by the first cable (13), connecting a fifth cable (3) at one end of the device to be measured (2), connecting the fifth cable (3) with the first cable (13) by a second cable (14), measuring the line Loss of the whole loop, and recording the measurement result as Loss 1;
step S2, measuring the line Loss of the fifth cable (3), and recording the measurement result as Loss 2;
step S3, separating the first cable (13) from the first connection point (112), separating the third cable (15) from the second signal interface (122), taking out the second cable (14), connecting two ends of the second cable (14) to the terminal of the first cable (13) and the second signal interface (122), respectively, measuring the sum of the line losses of the first cable (13) and the second cable (14), and recording the measurement result as Loss 3;
step S4, calculating the line loss of the radio frequency test tool according to the following formula: the Loss is 1-Loss2-Loss3, wherein the Loss is the line Loss of the radio frequency test tool.
2. The calibration method of the radio frequency test tool according to claim 1, wherein the device under test (2) comprises a PCB, and an antenna matching element attached to the PCB.
3. The calibration method of the radio frequency test tool according to claim 1, wherein the test instrument (12) is an RF test instrument (12).
4. The calibration method of the radio frequency test tool according to claim 1, wherein a first mounting cavity is formed in the solid stage, and the coupling plate (1111) is fixed in the first mounting cavity.
5. The calibration method of the radio frequency test tool according to claim 1, wherein a second mounting cavity is arranged on the solid-state table; in the step S1, the step of "mounting the device under test (2) on the fixed stage (111)" is to fix the device under test (2) in the second mounting chamber.
6. The calibration method of the radio frequency test tool according to claim 1, wherein the fifth cable (3) comprises a radio frequency wire and a radio frequency terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011644916.2A CN114690106A (en) | 2020-12-30 | 2020-12-30 | Calibration method of radio frequency test tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011644916.2A CN114690106A (en) | 2020-12-30 | 2020-12-30 | Calibration method of radio frequency test tool |
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| Publication Number | Publication Date |
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| CN114690106A true CN114690106A (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011644916.2A Pending CN114690106A (en) | 2020-12-30 | 2020-12-30 | Calibration method of radio frequency test tool |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115372740A (en) * | 2022-08-19 | 2022-11-22 | 上海物骐微电子有限公司 | RF chip line loss test method, system, readable storage medium and electronic device |
| CN115499070A (en) * | 2022-08-08 | 2022-12-20 | 成都万创科技股份有限公司 | Wireless module testing system and method |
-
2020
- 2020-12-30 CN CN202011644916.2A patent/CN114690106A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115499070A (en) * | 2022-08-08 | 2022-12-20 | 成都万创科技股份有限公司 | Wireless module testing system and method |
| CN115372740A (en) * | 2022-08-19 | 2022-11-22 | 上海物骐微电子有限公司 | RF chip line loss test method, system, readable storage medium and electronic device |
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