Easy-to-use anti-short-circuit power supply ripple noise test clamp
The power supply ripple noise test fixture, designed with an X-shaped linkage structure and an insulating film, solves the problems of short circuits and poor contact in traditional fixtures, achieving stable clamping and high-precision testing, and is suitable for highly integrated electronic devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-03-24
AI Technical Summary
Traditional test fixtures are prone to short circuits when testing ripple noise and are difficult to hold small devices stably. Existing coaxial probe solutions have problems with poor contact and interference.
The clamp body and clamp body are connected by an X-type linkage structure. The metal clamp head is coated with an insulating film on the outside. The clamp head is normally closed and is equipped with a DC blocking capacitor and a matching resistor. The clamp body is equipped with a limit block and anti-slip protrusion on the inside. The clamp tail design is easy to operate.
It achieves stable and gentle clamping force, reduces the risk of short circuits, improves testing accuracy and safety, and is suitable for highly integrated PCBs.
Smart Images
Figure CN224035454U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of test fixture technology, specifically to an easy-to-use, short-circuit-proof power supply ripple noise test fixture. Background Technology
[0002] As the integration of electronic devices continues to increase, the resistive and capacitive components on single boards are being arranged more and more densely in a small area, making it increasingly difficult to measure using traditional passive probes. Traditionally, passive probes are used in conjunction with grounding pins, but this testing method is quite complex for testing ripple and noise. Currently, the commonly used clamp-shaped test fixtures are prone to scratching the measurement position or touching nearby devices during testing due to clamping force and structural issues, causing short circuits.
[0003] For chips that are sensitive to ripple noise, traditional testing methods are no longer sufficient. Coaxial cable with DC blocking capacitor has become a better testing method.
[0004] There are currently several methods for testing ripple noise using coaxial cables: 1) Coaxial cable bonding, which is very stable and accurate, but requires rebonding each time, which is very troublesome; 2) Ripple noise probe clip, which is convenient and efficient, but current coaxial cable probe clip solutions all have some problems.
[0005] Currently available probes using all-metal heads for clamping are prone to accidental contact with other devices, leading to device damage. Most clamps on the market are positive-acting clamps (the clamping feet are normally open, and force is applied to close the clamp). Since the devices to be clamped are generally small, the clamping force is difficult to control, and deformation of the metal head can easily cause poor contact or slippage from the device. Furthermore, normally open clamps are very likely to contact adjacent devices, causing short circuits and damage. Current coaxial probes generally have an arc-shaped tail with the coaxial cable protruding from it. Because coaxial cables are relatively rigid, they are prone to interference during use, requiring additional clamping points. Utility Model Content
[0006] In order to solve the problems existing in the prior art, this utility model provides a power supply ripple noise test fixture with reasonable structural design that is easy to use and prevents short circuits.
[0007] The technical solution of this utility model is as follows:
[0008] An easy-to-use, short-circuit-proof power supply ripple noise test fixture includes a clamp body, a clamp body, and two metal clamps. Two metal clamps are respectively positioned at the ends of corresponding clamp bodies, and the clamp body and clamp body are connected by an X-shaped linkage structure. The clamp bodies are symmetrically arranged and tilted inwards, so that the metal clamps are normally in a closed state. Positive and negative cables are respectively connected to the two metal clamps, and the metal clamp connected to the positive cable is connected to a DC blocking capacitor and a matching resistor. The positive and negative cables are respectively connected to connectors.
[0009] Furthermore, a limiting block is provided on the inner side of the clamp body, so that there is a gap between the two metal clamps to prevent the two metal clamps from contacting each other; the two metal clamps do not contact each other when not in use, so that the metal clamps remain unforced when not in use, and prevent the clamps from undergoing irreversible deformation.
[0010] Furthermore, the metal chuck is a plated metal chuck with an inner metal layer and an outer plated layer, and the plated layer is an insulating layer.
[0011] Furthermore, anti-slip protrusions are provided on both sides of the clamp to increase the coefficient of friction between the fingers and the clamp.
[0012] Furthermore, an easy-to-use, short-circuit-proof power ripple noise test fixture also includes a clamp tail, which is disposed on the clamp body at one end away from the clamp body, and the clamp tail has recessed structures on both sides for finger pressure during measurement.
[0013] Furthermore, the DC blocking capacitor and the matching resistor are both housed inside the clamp, and a cover is provided on the outer shell of the clamp at the position corresponding to the DC blocking capacitor, which facilitates the maintenance and repair of the DC blocking capacitor.
[0014] Furthermore, the clamp body and clamp body are respectively provided with holes, and the positive and negative cables corresponding to the two metal clamp heads pass out of the holes, pass into the clamp body, and then pass out from the clamp tail, are stranded into a coaxial line, and are connected to the connector for connecting the oscilloscope.
[0015] Furthermore, the clamp body is coated with red and blue dual-color paint layers to distinguish the positive and negative poles of the corresponding metal clamps.
[0016] The beneficial effects of this utility model are as follows:
[0017] 1) The X-type linkage structure connects the clamp body to the clamp body. On the one hand, it can apply a stable and gentle force to ensure stable and lasting contact between the metal at both ends of the test point device. The force exerted by the hand is focused on fixing the position of the entire clamp, thus freeing up the hand to operate the oscilloscope. On the other hand, this structure makes the metal clamp normally closed, which can reduce the situation of accidental contact and short circuit caused by other clamps on the market due to opening.
[0018] 2) An insulating film is plated on the outside of the metal chuck to prevent short circuits caused by contact with the outside of the metal chuck. The outer coating can greatly reduce the occurrence of this situation.
[0019] 3) The overall structure of this utility model is simple and easy to operate. It can be used to hold and clamp small, delicate objects, which is in line with the development trend of increasingly integrated PCB boards. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 This is a partial structural diagram of the metal chuck of this utility model;
[0022] Figure 3 This is a schematic diagram of the overall side structure of this utility model;
[0023] Figure 4 This is a schematic diagram illustrating the use of this utility model;
[0024] Figure 5 This is a schematic diagram showing the connection between the positive electrode cable and the metal clamp of this utility model;
[0025] Figure 6 This is a schematic diagram of the internal structure of the clamping body of this utility model;
[0026] Figure 7 This is a schematic diagram of the internal structure of the clamp tail of this utility model;
[0027] Figure 8 This is a schematic diagram of the coaxial cable structure of this utility model;
[0028] Figure 9 This is a schematic diagram of the cable threading of this utility model;
[0029] In the diagram: 1. Metal clamp; 2. Clamp body; 3. Cable; 4. Clamp body; 5. Clamp tail; 6. Coaxial cable; 7. Connector; 8. Inner layer; 9. Outer layer; 10. Hole; 11. Cover; 12. X-type linkage structure; 13. Limiting block; 14. Thread; 15. Coaxial cable hole; 16. Insulating plastic cylinder. Detailed Implementation
[0030] The present invention will be further described below with reference to the accompanying drawings.
[0031] like Figure 1As shown, an easy-to-use short-circuit-proof power supply ripple noise test fixture includes a metal clamp 1, a clamp body 2, a cable 3, a clamp body 4, a clamp tail 5, a coaxial cable 6, and a connector 7. The metal clamp 1 is located at the lower end of the clamp body 2. An X-shaped linkage structure 12 is provided between the upper end of the clamp body 2 and the lower end of the clamp body 4. The clamp body 4 has an inverted U-shaped structure. There are two metal clamps 1, and the clamp body 2 corresponds to the metal clamp 1. By squeezing the clamp body 4 from left to right, the metal clamp 1 can be opened by the X-shaped linkage structure 12.
[0032] The X-type linkage structure is normally a closed clamp structure. This structure can apply a stable and gentle force and is often used to hold delicate small objects. It ensures stable and lasting contact between the metal ends of the test point device. This structure allows the user to focus their force on fixing the entire clamp position, thus freeing up their hand to operate the oscilloscope. At the same time, the clamping force of this structure is normally closed, which can reduce the situation where other clamps on the market cause accidental contact and ultimately short circuits due to opening.
[0033] The upper end of the clamp body 4 is provided with a clamp tail 5, which is connected to the clamp body 4 by a thread, making it convenient for inspection and disassembly (for easy replacement and repair when the coaxial cable is damaged). The two sides of the clamp tail 5 are recessed for the middle and index fingers to apply force to control the angle of the clamp.
[0034] Anti-slip protrusions are provided on both sides of the clip body 4 to increase the friction between the clip body and the fingerprint when the finger applies force, so as to stabilize the clip and facilitate the application of force when the clip is opened.
[0035] Two metal clamps 1 are respectively connected to positive and negative cables 3. The positive cable is equipped with a DC blocking capacitor and a DC blocking resistor to form a DC blocking circuit. The DC blocking circuit consists of a capacitor and a 50-ohm resistor connected in series. The 50-ohm resistor is close to the metal clamp, and the capacitor is positioned at position 11 for easy disassembly and replacement. This is to match the testing equipment, which defaults to the more common 10 microfarad. Figure 5 As shown.
[0036] like Figure 3 , 9 As shown, corresponding holes 10 for cables to pass through are provided on the clamp body 2 and clamp body 4. After the positive and negative cables 3 pass through the clamp body 4, they pass through the clamp tail 5 at the end of the clamp body (the clamp tail has a coaxial cable hole 15). After the positive and negative cables 3 pass through the clamp tail 5, they are stranded into a coaxial cable 6 and connected to the connector 7 (the coaxial cable hole and the insulating plastic cylinder 16 that splits into two strands in front of the coaxial cable can hold them in place). The coaxial cable 6 is the outer sheath covering the positive and negative cables. It can also be understood that the outer sheath has been removed from the part of the positive and negative cables that are led out.
[0037] In another embodiment, the metal chuck 1 is a plated metal chuck, wherein the inner layer is a metal layer (chuck metal sheet) and the outer layer is a plated layer. The outer layer of the metal chuck 1 is plated with an insulating film. Due to the advancement of current technology, electronic components are arranged in an extremely dense manner on the PCB board. In order to maintain a certain strength, the metal chuck 1 needs a certain volume, which makes its outer side very easy to touch the ground and cause a short circuit. The outer coating can greatly reduce this situation.
[0038] like Figure 1 , 3 As shown, in another embodiment, the inner side of the clamp body 2 is provided with limiting blocks. The limiting of the clamp opening keeps the metal clamp from being stressed when not in use, preventing irreversible deformation of the clamp.
[0039] In another embodiment, the clamp 2 is marked with red and blue colors to distinguish the positive and negative terminals, with the side containing the DC blocking capacitor being positive, reducing the difficulty of differentiation. Furthermore, in normal use, many engineers use their fingers to touch the clamp to distinguish the positive and negative terminals, which can easily cause the clamp to corrode due to bodily fluids. This structure, with its normally closed outer protective insulating film, can largely eliminate this widespread problem.
[0040] In another embodiment, the clamp body, clamp frame, and X-shaped linkage structure of the present invention are integrally molded.
[0041] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.
Claims
1. A user-friendly, short-circuit-protected power supply ripple noise test fixture, characterized in that, The device includes a clamp body, a clamp frame, and metal chucks; two metal chucks are respectively located at the ends of the corresponding clamp frames, and the clamp body and clamp frame are connected by an X-shaped linkage structure; the clamp frames are symmetrical and tilted inwards, so that the metal chucks are normally in a closed state; positive and negative cables are respectively connected to the two metal chucks, and the metal chuck connected to the positive cable is connected to a DC blocking capacitor and a matching resistor, and the positive and negative cables are respectively connected to the connector for connecting to the oscilloscope.
2. The easy-to-use short-circuit protected power supply ripple noise test fixture according to claim 1, characterized in that, A limiting block is provided on the inner side of the clamp body, so that there is a gap between the two metal clamps to prevent the two metal clamps from contacting each other.
3. The easy-to-use short-circuit protected power supply ripple noise test fixture according to claim 1, characterized in that, The metal chuck is a plated metal chuck with an inner metal layer and an outer plated layer, and the plated layer is an insulating layer.
4. The easy-to-use short-circuit protected power supply ripple noise test fixture according to claim 1, characterized in that, The clamp body has anti-slip protrusions on both sides.
5. The easy-to-use short-circuit-protected power supply ripple noise test fixture according to claim 1, characterized in that, It also includes a clamp tail, which is set on the clamp body and away from the clamp body at one end, and the clamp tail has a recessed structure on both sides for finger pressure during measurement.
6. The easy-to-use short-circuit-protected power supply ripple noise test fixture according to claim 1, characterized in that, The DC blocking capacitor and the matching resistor are both located inside the clamp body, and the outer shell of the clamp body has an openable cover at the position corresponding to the DC blocking capacitor.
7. The easy-to-use short-circuit-protected power supply ripple noise test fixture according to claim 5, characterized in that, The positive and negative cables corresponding to the two metal clamps respectively emerge from the clamp body, pass through the clamp body, and then emerge from the end of the clamp, are twisted into a coaxial line, and then connected to the connector.
8. The easy-to-use short-circuit protected power supply ripple noise test fixture according to claim 1, characterized in that, The clamps are coated with red and blue paint layers to distinguish the positive and negative terminals of the corresponding metal clamps.