Contact type multifunctional radio frequency power detection tweezers

Abstract

The utility model relates to a pair of contact type multifunctional radio frequency power detection tweezers, which comprises a tweezers head part, a tweezers body part and a tweezers tail part, and is characterized in that the tweezers head part is provided with a positive electrode tweezers foot (1) and a negative electrode tweezers foot (2), one end of the positive electrode tweezers foot (1) is provided with an inner conductor of a radio frequency cable (4), and the positive electrode tweezers foot (1) and the negative electrode tweezers foot (2) are in rigid connection; the negative electrode tweezers foot (2) and the outer conductor of the radio frequency cable (4) are connected in a short distance through a flexible connecting piece and can move freely; a circuit board is arranged in the tweezers body part, a switch gating unit (6) is integrated, and the switch gating unit (6) controls a signal path through a radio frequency single-pole double-throw switch. The pair of detection tweezers supports programming calibration of external equipment, calibration data are stored in the nonvolatile FLASH memory and then are corrected and detected, and the circuit integration degree is high; and the detected radio frequency power can be directly displayed during simple circuit detection, and instruments and equipment such as a frequency spectrograph and a power meter do not need to be accessed.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency signal detection technology, and in particular to a contact-type multifunctional radio frequency power detection tweezers. Background Technology

[0002] When measuring radio frequency (RF) signal power, RF power meters are generally used, which can be divided into through-type and absorptive RF power meters. Through-type RF power meters are mainly connected in series in the RF circuit without interrupting the signal, but require the RF circuit to have an external interface. Absorptive RF power meters act as a terminal load, with the RF signal directly fed into the RF power meter. They also generally require the RF circuit to have an external interface and can be equipped with an RF power probe for contact power detection, but the overall cost is high.

[0003] When debugging at the circuit board level, highly precise power measurement is often not required, making lightweight and easy-to-use power probes more popular. In such cases, a simple coaxial probe is typically used. The RF coaxial cable is cut, exposing the inner conductor slightly longer than the outer conductor. One end of the exposed inner conductor contacts the circuit node, and the other end is connected to a power meter or spectrum analyzer via an RF connector. This allows for a rough measurement of the power at the RF circuit node. However, this simple coaxial probe, with the RF coaxial cable as its main component, lacks stability when held and requires an external power meter or spectrum analyzer to display the power.

[0004] Therefore, during circuit board level debugging, given the high cost of RF power instruments and the insufficient stability of simple coaxial probes, there is an urgent need to design a detection device that can directly detect and display RF power and also work with instruments for precise analysis. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides a contact-type multifunctional radio frequency power detection tweezers, which is divided into a tweezers head, a tweezers body, and a tweezers tail, including:

[0006] The tweezers head is provided with a positive tweezer foot and a negative tweezer foot. One end of the positive tweezer foot is rigidly connected to the inner conductor of the radio frequency cable. The negative tweezer foot is connected to the outer conductor of the radio frequency cable by a flexible connector and is free to move. A high-brightness LED light with a focusing cover is provided between the positive and negative tweezer feet for illuminating the detection area.

[0007] The tweezers have a built-in circuit board that integrates a switch selection unit. The switch selection unit controls the signal path through a radio frequency single-pole double-throw switch. The first path leads to the detection unit for autonomous detection, and the second path is directly connected to the SMA interface at the tail of the tweezers to adapt to external instruments. A DC blocking capacitor is also provided at the connection between the radio frequency cable and the circuit board, specifically between the solder joint of the inner conductor of the radio frequency cable and the input end of the switch selection unit, forming a DC blocking link for the signal path.

[0008] Meanwhile, the tweezers have an adjustment interface on the side of their body, which supports external device programming calibration. The calibration data is stored in a non-volatile data storage unit and is called by the MCU processing unit to correct the test results.

[0009] In one embodiment of this utility model, a display unit is embedded in the body of the tweezers. The display unit is connected to the built-in circuit board via a signal cable. The built-in circuit board is also equipped with a buzzer unit. The triggering conditions of the buzzer unit are also presented in the visualization area of ​​the display unit. The display unit is an LCD screen that displays the radio frequency power detection value in real time. The buzzer unit provides acoustic feedback after the detection is completed, and the triggering conditions include at least one of the following: detection completion, over-range alarm, and low battery warning.

[0010] In one embodiment of this utility model, the core device of the detection unit is a radio frequency power detector, which is used to convert radio frequency signals into DC signals and amplify the signals through an operational amplifier with an operational amplifier conditioning unit on a built-in circuit board.

[0011] In one embodiment of this utility model, the MCU processing unit integrates ADC function to read the conditioned signal and calculate the RF power value based on the calibration data of the data storage unit; at the same time, the handheld area of ​​the tweezers is also provided with a button, which is directly connected to the GPIO pin of the MCU processing unit through a printed circuit board.

[0012] In one embodiment of this utility model, the flexible connector of the negative electrode tweezers is made of low impedance material, and the welding point with the outer conductor of the radio frequency cable is connected to it through an elastic insulating shrink tube structure.

[0013] In one embodiment of this utility model, the built-in circuit board is further provided with a power supply unit and a battery compartment. The power supply unit includes a DC-DC converter and is connected to the output terminal of the battery compartment to convert the power supply of the battery compartment into multi-stage voltages required by the circuit board.

[0014] In one embodiment of this utility model, the SMA interface is connected to the circuit board via a CPWG transmission line with a line impedance of 50 ohms, and the outer layer of the transmission line is provided with a shielding structure to reduce radiation interference.

[0015] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: The detection tweezers of this utility model are designed in the shape of tweezers, which are lightweight and compact, easy to carry and use, and have high circuit integration and low cost; and compared with simple single-leg probe detection, the detection data is more accurate, and the double-leg contact detection is easier to hold and more stable, and has LED lighting for better visibility.

[0016] It integrates detection, processing, display, storage, and debugging functions. During simple circuit testing, it can directly display the detected RF power without the need to connect to instruments such as spectrum analyzers and power meters. It can also debug and calibrate the test data according to the usage scenario, reduce the deviation of the test results, and increase the accuracy of the test readings. The circuit has a switch selection function, and the test mode can be selected. During precise circuit testing, it can be directly connected to instruments such as spectrum analyzers and power meters through the SMA interface for accurate and detailed RF signal testing. Attached Figure Description

[0017] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of the contact-type multifunctional radio frequency power detection tweezers of this utility model.

[0019] As shown in the figure, 1. Positive tweezers, 2. Negative tweezers, 3. LED, 4. RF cable, 5. DC blocking capacitor, 6. Switch selection unit, 7. Detector unit, 8. Operational amplifier conditioning unit, 9. MCU processing unit, 10. Debug interface, 11. Display unit, 12. Buzzer unit, 13. SMA interface, 14. Battery compartment, 15. Data storage unit, 16. Buttons, 17. Power supply unit. Detailed Implementation

[0020] like Figure 1As shown, this embodiment provides a contact-type multifunctional RF power detection tweezers. The tweezers head has a pair of tweezers feet, namely a positive tweezer foot 1 and a negative tweezer foot 2. The positive tweezer foot 1 is rigidly connected to the inner conductor of one end of the RF cable 4, and the negative tweezer foot 2 is flexibly connected to the outer conductor of the same end of the RF cable 4. An LED light 3 is used for spot illumination between the two tweezers feet. The other end of the RF cable 4 is soldered to a circuit board and enters the switch selection unit 6 through a DC blocking capacitor 5, after which two paths can be selected. When the contact-type multifunctional RF power detection tweezers are used for measurement and display, the MCU processing unit 9 is configured with data by button 16. The switch selection unit 6 is turned on to the detection unit 7 for detection. The detected signal is output to the operational amplifier conditioning unit 8 for conditioning and amplification, and then input to the MCU processing unit 9 to read the signal. At the same time, the MCU processing unit 9 processes the read detected data according to the calibration data of the data storage unit 15. After the data processing is completed, the buzzer unit 12 sounds once and the data is displayed on the display screen of the display unit 11. When the tweezers are not used for measurement and display, the contact-type multi-functional RF power detection tweezers are only used for RF path bridging. Data is configured for the MCU processing unit 9 via button 16, and the switch selection unit 6 is connected to the SMA interface 13. The SMA interface 13 is connected to external instruments such as a spectrum analyzer or power meter for detailed signal detection. The entire circuit is powered by the dry cell battery in the battery compartment 14, which is then converted by the DC-DC converter in the power supply unit 17.

[0021] Specifically, in this embodiment, the testing tweezers require calibration data for accurate RF power detection at certain commonly used frequencies. During data calibration, the debugging interface 10 is connected to an external computer via a downloader, allowing direct computer programming and configuration control. An RF signal source outputs dB signals of varying magnitudes. The positive tweezers 1 and negative tweezers 2 contact the output signal and reference ground of the signal source, respectively. The computer programs and configures the MCU processing unit 9, controlling the switch selection unit 6 to conduct the detection unit 7. After subsequent processing, the detection results corresponding to different dB signals are obtained. This result is then processed and configured into the data storage unit 15, allowing the calibration data to be retrieved for more accurate RF power detection during testing.

[0022] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A contact-type multifunctional radio frequency power detection tweezers, wherein the tweezers are divided into a tweezers head, a tweezers body, and a tweezers tail, characterized in that, include: The tweezers head is provided with a positive tweezer foot (1) and a negative tweezer foot (2). One end of the positive tweezer foot (1) is connected to the inner conductor of the radio frequency cable (4), and the two are rigidly connected. The negative tweezer foot (2) is connected to the outer conductor of the radio frequency cable (4) by a flexible connector and can move freely. A high-brightness LED light (3) with a focusing cover is provided between the positive tweezer foot (1) and the negative tweezer foot (2). The tweezers have a built-in circuit board that integrates a switch selection unit (6). The switch selection unit (6) controls the signal path through a radio frequency single-pole double-throw switch. The first path is connected to the detector unit (7) to achieve autonomous detection, and the second path is directly connected to the SMA interface (13) at the tail of the tweezers to adapt to external instruments. A DC blocking capacitor (5) is also provided, located between the inner conductor solder joint of the radio frequency cable (4) and the input end of the switch selection unit (6). Meanwhile, the tweezers are equipped with a debugging interface (10) on the side of the body, which supports external device programming calibration. The calibration data is stored in a non-volatile data storage unit (15) and the calibration data is called through the MCU processing unit (9) to correct the detection results.

2. The testing tweezers according to claim 1, characterized in that: The tweezers are inlaid with a display unit (11), which is connected to the built-in circuit board via a signal cable. The built-in circuit board is also equipped with a buzzer unit (12), and the triggering conditions of the buzzer unit (12) are also presented in the visualization area of ​​the display unit (11).

3. The detection tweezers according to claim 1, characterized in that: The core component of the detection unit (7) is a radio frequency power detector, and the signal is amplified by an operational amplifier with an operational amplifier conditioning unit (8) on a built-in circuit board.

4. The testing tweezers according to claim 1, characterized in that: The MCU processing unit (9) integrates ADC function to read the conditioned signal and calculate the RF power value based on the calibration data of the data storage unit (15); at the same time, the hand-held area of ​​the tweezers is also provided with a button (16), which is directly connected to the GPIO pin of the MCU processing unit (9) through the printed circuit board.

5. The testing tweezers according to claim 1, characterized in that: The flexible connector of the negative electrode tweezers (2) is made of low impedance material, and the welding point with the outer conductor of the radio frequency cable (4) is connected to it through an elastic insulating shrink tube structure.

6. The testing tweezers according to claim 1, characterized in that: The built-in circuit board also includes a power supply unit (17) and a battery compartment (14). The power supply unit (17) includes a DC-DC converter and is connected to the output of the battery compartment (14).

7. The testing tweezers according to claim 1, characterized in that: The SMA interface (13) is connected to the circuit board via a CPWG transmission line with a line impedance of 50 ohms.

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