Signal acquisition probe and probe thereof

Abstract

The utility model discloses a signal acquisition probe and a probe thereof. The probe is provided with an external connection part and an internal connection part which are connected in sequence. One end, far away from the internal connection part, of the external connection part is used for externally connecting a to-be-tested signal source; one end, far away from the external connection part, of the internal connection part is connected with a body circuit of the signal acquisition probe. The extending direction of the inner connecting part is different from the extending direction of at least part of the outer connecting part. The cross-sectional area of one end, close to the internal connection part, of the external connection part is larger than the cross-sectional area of the other end of the external connection part and the cross-sectional area of the internal connection part, so that the combination of a bending structure of the probe and a structure with thick middle and two thin ends is realized, the parasitic inductance is greatly reduced, and the measurement precision and stability are improved.

Description

Technical Field

[0001] The utility model relates to the field of signal acquisition, and particularly relates to a signal acquisition probe and its probe Background Art

[0002] Single-ended high-impedance signal acquisition probes, with their significant characteristics such as high input impedance, low parasitic capacitance, and little impact on the signal source, have been widely used in many fields such as high-frequency signal measurement, analog signal measurement, signal testing of high-speed digital circuits, biomedical signal acquisition, education and scientific research, and even industrial control. Such probes have excellent performance and are undoubtedly crucial tools in the process of electronic testing and debugging

[0003] Existing technologies mostly adopt signal acquisition probes as shown in Figure 1 However, such signal acquisition probes have poor accuracy in signal measurement Summary of the Utility Model

[0004] The utility model provides a signal acquisition probe and its probe to improve the measurement accuracy and stability

[0005] According to one aspect of the utility model, a probe of a signal acquisition probe is provided. The probe of the signal acquisition probe includes: an external connection part and an internal connection part connected in sequence

[0006] One end of the external connection part far from the internal connection part is used to externally connect to a signal source to be measured; one end of the internal connection part far from the external connection part is used to connect to the body circuit of the signal acquisition probe

[0007] The extending direction of the internal connection part is different from at least part of the extending direction of the external connection part

[0008] The cross-sectional area of one end of the external connection part close to the internal connection part is larger than the cross-sectional area of the other end of the external connection part and the cross-sectional area of the internal connection part

[0009] Optionally, the external connection part includes a middle section and an end section. The middle section is connected between the end section and the internal connection part; the extending direction of the end section is the same as the extending direction of the internal connection part and different from the extending direction of the middle section

[0010] Optionally, the cross-sectional area of the middle section is larger than the cross-sectional area of the end section and the cross-sectional area of the internal connection part

[0011] Optionally, the external connection part includes a socket part and an internal part. The first end of the internal part is connected to the internal connection part, and the second end of the internal part is used to externally connect to a signal source to be measured; the socket part is sleeved on the outside of the first end of the internal part and contacts the outside of the first end of the internal part

[0012] Optionally, the socket includes a metal sleeve and / or a metal wire winding.

[0013] Optionally, the built-in part is provided with a first section and a second section;

[0014] The first section is the section of the built-in part arranged inside the socket, and the second section is the section of the built-in part arranged outside the socket;

[0015] The extending direction of the second section is the same as the extending direction of the inner connecting part and different from the extending direction of the first section.

[0016] Optionally, one end of the external connecting part far from the inner connecting part is a conical tip.

[0017] According to another aspect of the present invention, there is provided a signal acquisition probe, which includes any of the foregoing probes and a body circuit;

[0018] The body circuit includes an attenuation network, a high-frequency path module, a low-frequency path module, an impedance transformation module, and a coaxial cable;

[0019] The input end of the attenuation network is connected to the inner connecting part of the probe;

[0020] The output end of the attenuation network is respectively connected to the impedance transformation module through the high-frequency path module and the low-frequency path module;

[0021] The impedance transformation module is also connected to the first end of the coaxial cable, and the second end of the coaxial cable is used for externally connecting a signal measuring instrument.

[0022] Optionally, the signal acquisition probe further includes a voltage bias module;

[0023] The first end of the voltage bias module is used for externally connecting the signal measuring instrument to receive the bias control signal of the signal measuring instrument; the second end of the voltage bias module is connected to the low-frequency path module.

[0024] For the signal acquisition probe and its probe provided by the present invention, the probe is provided with an external connecting part and an inner connecting part connected in sequence. One end of the external connecting part far from the inner connecting part is used for externally connecting a signal source to be measured; one end of the inner connecting part far from the external connecting part is used for connecting the body circuit of the signal acquisition probe. The extending direction of the inner connecting part is different from the extending direction of at least part of the external connecting part. The cross-sectional area of one end of the external connecting part close to the inner connecting part is larger than the cross-sectional area of the other end of the external connecting part and the cross-sectional area of the inner connecting part, realizing the combination of the bending structure of the probe and the structure with a thick middle and thin ends. This structure greatly reduces the parasitic inductance, thereby improving the measurement accuracy and stability.

[0025] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understandable through the following description. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is a schematic diagram of the composition of a signal acquisition probe in the prior art;

[0028] Figure 2 is a frequency response curve diagram of a signal acquisition probe in the prior art;

[0029] Figure 3 is a schematic structural diagram of a probe of a signal acquisition probe proposed by the present utility model;

[0030] Figure 4 is a schematic structural diagram of a probe of another signal acquisition probe provided by an embodiment of the present utility model;

[0031] Figure 5 is a schematic structural diagram of a probe of yet another signal acquisition probe provided by an embodiment of the present utility model;

[0032] Figure 6 is a schematic diagram of the composition of a signal acquisition probe and its corresponding signal measurement instrument provided by an embodiment of the present utility model;

[0033] Figure 7 is a schematic external structure diagram of a signal acquisition probe provided by an embodiment of the present utility model;

[0034] Figure 8 is a schematic external structure diagram of another signal acquisition probe provided by an embodiment of the present utility model;

[0035] Figure 9 is a frequency response curve diagram of a signal acquisition probe provided by an embodiment of the present utility model;

[0036] Figure 10 is a comparison diagram of a first frequency response curve and a second frequency response curve provided by an embodiment of the present utility model. Detailed Embodiments

[0037] To enable those skilled in the art to better understand the solution of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0039] As described in the background art, existing technologies mostly use signal acquisition probes such as Figure 1 shown, which include probes and body circuits. On this basis, the inventor uses the signal acquisition probe of the prior art in Figure 1 to perform signal acquisition, and obtains the actual frequency response curve 201 of the signal acquisition probe and the ideal frequency response curve 202 of the signal acquisition probe as shown in Figure 2 shown. From Figure 2 it can be seen that the signal accuracy collected by the signal acquisition probe in the prior art is poor and the applicable range is narrow. After further research by the inventor, it is found that the parasitic inductance of the metal conductor probe of this signal acquisition probe is relatively large. On the one hand, the resonance effect and noise introduced by it will cause distortion of the measurement signal. On the other hand, the equivalent impedance of the probe is relatively large, and it is difficult to maintain a good frequency response in the high-frequency band, which limits the effective bandwidth of the probe, resulting in poor signal measurement accuracy of the signal acquisition probe.

[0040] Based on this, the present application proposes a probe for a signal acquisition probe. Figure 3 It is a structural schematic diagram of a probe for a signal acquisition probe proposed by the present utility model. Refer to Figure 3, the probe 300 of the signal acquisition probe includes an external connection part 301 and an internal connection part 302 connected in sequence. One end of the external connection part 301 far from the internal connection part 302 is used to externally connect to the signal source to be measured; one end of the internal connection part 302 far from the external connection part 301 is used to connect to the body circuit of the signal acquisition probe. The extending direction of the internal connection part 302 is different from at least part of the extending direction of the external connection part 301. The cross-sectional area of the external connection part 301 near the internal connection part 302 is larger than the cross-sectional areas of the other end of the external connection part and the internal connection part. Herein, the cross-section intercepting plane at each position refers to the plane perpendicular to the extending direction at the corresponding position, Figure 3 is exemplarily shown by a dotted line.

[0041] Specifically, the probe 300 of the signal acquisition probe is used to access the signal source to be measured and transmit it to the body circuit. The external connection part 301 of the probe 300 refers to the component, part or portion on the probe 300 that is connected to the signal source to be measured. Exemplarily, the external connection part 301 of the probe 300 can be an integral body made of a conductor material, or a component composed of at least two conductor parts. Among them, the shapes of the integral body, component and part can respectively include at least one of a cylinder, a frustum and a cone. When the external connection part 301 is composed of multiple parts, in addition to including regular cylinders, frustums and cones as the main body 303, the external connection part 301 can also be provided with a connection part 304 at the connection positions of adjacent main bodies 303 (as well as the connection position between the main body and the internal connection part). Exemplarily, when a single-piece connector that is not integrally produced with the two adjacent main bodies 303 is provided at the connection part 304, the connector can be a rotary connector to facilitate relative rotation between two adjacent parts. One end of the external connection part 301 far from the internal connection part 302 can also be set as a conical tip to reduce the contact area between the probe 300 and the signal source to be measured.

[0042] The internal connection part 302 of the probe 300 refers to the component, part or portion on the probe 300 that is connected to the signal access end of the body circuit. Exemplarily, the internal connection part 302 of the probe 300 can include a cylindrical part made of a conductor material. One end of the cylindrical internal connection part 302 is connected to the signal access end of the body circuit, and the other end is connected to the external connection part 301. It should be particularly noted here that the "sequential connection" between the internal connection part 302 and the external connection part 301 only means that the two can transmit signals to each other. The internal connection part 302 and the external connection part 301 can either be two parts or sections on an integral body ( Figure 3 as shown in it), or two parts or components combined by using connectors, welding or other processes, which is not limited herein.

[0043] The extending direction of the inner connecting part 302 refers to the extending directions at both ends of the inner connecting part 302. Exemplarily, when the inner connecting part 302 is a regular prism (such as a cylinder and a prism) or a frustum (such as a frustum of a cone and a frustum of a prism), the extending direction of the inner connecting part 302 is the direction from the center of the bottom surface at one end to the center of the bottom surface at the other end. The outer connecting part 301 includes at least one partition, and one main body 303 corresponds to one partition. When multiple partitions are provided, the extending directions of each partition can be different or the same. When the extending directions of the partitions are the same, the outer connecting part 301 is in a non-bent shape. When the extending directions of each partition are different, the outer connecting part 301 is in a bent shape. Among them, the definition of the extending direction of each partition is similar to that of the inner connecting part, which refers to the extending directions at both ends of the main body 303 within the partition (the extending direction of the partition is not determined according to the extending direction at the connection). Since the extending direction of the inner connecting part 302 is different from the extending directions of at least part of the outer connecting part 301, the whole formed by the inner connecting part 302 and the outer connecting part 301 is bent, and at least one bent part is provided. In addition, the cross-sectional area of the outer connecting part near one end of the inner connecting part is larger than the cross-sectional area near the other end and also larger than the cross-sectional area of the inner connecting part. Such a bent structure with a thick middle and thin ends is beneficial to reducing the parasitic inductance of the probe, thereby reducing the difficulty of matching the characteristic impedance of the main body circuit to the measured circuit, and greatly reducing signal reflection and interference caused by impedance mismatch, thereby improving the measurement accuracy and stability.

[0044] The probe of the signal acquisition probe provided by the embodiment of the present invention is provided with an outer connecting part and an inner connecting part connected in sequence. One end of the outer connecting part away from the inner connecting part is used to externally connect to the signal source to be measured; one end of the inner connecting part away from the outer connecting part is used to connect to the main body circuit of the signal acquisition probe. The extending direction of the inner connecting part is different from the extending directions of at least part of the outer connecting part. The cross-sectional area of the outer connecting part near one end of the inner connecting part is larger than the cross-sectional area of the other end of the outer connecting part and the cross-sectional area of the inner connecting part, realizing the combination of the bent structure and the structure with a thick middle and thin ends of the probe. This structure greatly reduces the parasitic inductance, thereby improving the measurement accuracy and stability.

[0045] Optionally, Figure 4 FIG. 8 is a schematic structural diagram of a probe of another signal acquisition probe provided by the embodiment of the present invention. On the basis of the foregoing embodiment, the outer connecting part 301 includes a middle section 401 and an end section 402. The middle section 401 is connected between the end section 402 and the inner connecting part 302; the extending direction of the end section 402 is the same as that of the inner connecting part 302 and different from that of the middle section 401. The inner connecting part 302, the middle section 401 and the end section 402 are connected end to end in sequence, and a connection part 304 is provided between adjacent two. The cross-sectional area of the middle section 401 is larger than the cross-sectional area of the end section 402 and the cross-sectional area of the inner connecting part 302.

[0046] Specifically, the middle section 401 refers to the component on the outer connection part 301 close to the inner connection part 302, and the end section 402 refers to the component on the outer connection part 301 far from the outer connection part 301. In this embodiment, the inner connection part 302, the middle section 401, and the end section 402 are not three different sections of an integrally formed entity, but three components with a connection relationship. The middle section 401 and the end section 402 can be connected by welding or through a metal connector. Compared with the embodiment using a whole conductor probe, this way of sequentially connecting multiple parts to form the probe body can further reduce parasitic inductance. The extending direction of the end section 402 is the same as that of the inner connection part 302 and different from that of the middle section 401. Then, on the overall probe 300 composed of the outer connection part 301 and the inner connection part 302, at least two bends are provided (the connection part is the bend in this embodiment), that is, the connection between the inner connection part 302 and the middle section 401 and the connection between the middle section 401 and the end section 402.

[0047] The cross-sectional area of the middle section 401 is larger than the cross-sectional areas of the end section 402 and the inner connection part 302. Exemplarily, the middle section 401, the end section 402, and the inner connection part 302 can all be cylindrical conductors made of metal. The cross-sectional area of the middle section 401 cylinder is larger than the cross-sectional areas of the end section 402 cylinder and the inner connection part 302 cylinder. The middle section 401 is connected to the end section 402 and the middle section is connected to the inner connection part through metal connectors respectively. In this way, the cross-sectional setting method of the middle section 401 being thick at both ends and thin, combined with the bending method in this embodiment and the structure of connecting multiple components to form the probe 300, can further reduce parasitic inductance and achieve the effect of improving the measurement accuracy and stability.

[0048] Optionally, Figure 5 is a schematic structural diagram of the probe of another signal acquisition probe provided by an embodiment of the present invention. On the basis of the foregoing embodiment, with reference to Figure 5 , the outer connection part includes a socket part 501 and an internal part 502. The first end of the internal part 502 is connected to the inner connection part 302, and the second end of the internal part 502 is used to externally receive the signal source to be measured; the socket part 501 is sleeved outside the first end of the internal part 502 and contacts the outside of the first end of the internal part 502.

[0049] Specifically, the socket part 501 is a hollow component of the external connection part, which can be sleeved on the outer side of the side surface of other long components (in this embodiment, it is the built-in part 502). Exemplarily, the socket part 501 can include a metal sleeve and / or a metal wire winding part, such as a metal sleeve formed by enclosing and welding a spring-shaped metal part and a metal long block. In the figure, the socket part 501 is taken as an example of a spring-shaped metal part. The built-in part 502 refers to a component of the external connection part, which passes through the hollow part of the socket part 501. The socket part 501 is not only sleeved on the side wall of the built-in part 502, but also in close contact with the side wall of the built-in part 502. The length of the socket part 501 is less than or equal to the length of the built-in part 502, so that both ends of the built-in part 502 can be exposed and respectively connected to the internal connection part 302 and the signal source to be measured. The cross-sectional area of the built-in part 502 can be equal to the cross-sectional area of the internal connection part 302. The arrangement of the built-in part 502 and the socket part 501 in the external connection part can increase the cross-sectional area of the section of the external connection part close to the internal connection part 302. The second end of the built-in part 502 can also be set as a conical tip to reduce the contact area between the probe 300 and the signal source to be measured.

[0050] The built-in part 502 can be provided with or divided into a first section 503 (excluding the socket part 501) and a second section 504. The first section 503 is the section of the built-in part 502 arranged inside the socket part 501, and the second section 504 is the section of the built-in part 502 arranged outside the socket part 501. The extending direction of the second section 504 is the same as the extending direction of the internal connection part 302 and different from the extending direction of the first section 503. Such a partitioned and extended arrangement makes the probe body have two bends, that is, the connection part between the first section 503 and the internal connection part 302 and the connection part between the first section 503 and the second section 504. The setting of multiple bends combined with the setting of the socket part can further reduce the parasitic inductance and achieve the effect of improving the measurement accuracy and stability.

[0051] The present utility model also provides a signal acquisition probe. Figure 6 It is a schematic diagram of the composition of a signal acquisition probe and its corresponding signal measurement instrument provided by an embodiment of the present utility model. Figure 7 It is a schematic diagram of the external structure of a signal acquisition probe provided by an embodiment of the present utility model. Figure 8 It is a schematic diagram of the external structure of another signal acquisition probe provided by an embodiment of the present utility model, combined with Figure 6 、 Figure 7 and Figure 8, the signal acquisition probe 700 includes the probe 300 and the body circuit 701 in any of the foregoing embodiments. The body circuit 701 includes an attenuation network 702, a high-frequency path module 703, a low-frequency path module 704, an impedance transformation module 705, a voltage biasing module 706, and a coaxial cable 707. The input end of the attenuation network 702 is connected to the internal connection part of the probe 300. The output end of the attenuation network 702 is connected to the impedance transformation module 705 through the high-frequency path module 703 and the low-frequency path module 704 respectively. The impedance transformation module 705 is also connected to the first end of the coaxial cable 707, and the second end of the coaxial cable 707 is used to externally connect a signal measuring instrument 708. The first end of the voltage biasing module 706 is used to externally connect a signal measuring instrument 708 to receive the bias control signal of the signal measuring instrument 708; the second end of the voltage biasing module 706 is connected to the low-frequency path module 704.

[0052] Specifically, the input end of the attenuation network 702 serves as the signal access end of the body circuit 701 and is connected to the internal connection part of the probe 300, so as to access the signal obtained by the probe 300 into the body circuit 701. The attenuation network 702 refers to an attenuation circuit that performs preliminary attenuation processing on the accessed signal. The attenuation network 702 can keep the accessed signal with a high input impedance to protect the subsequent circuit. Exemplarily, the attenuation network 702 can be a combined circuit including passive devices such as resistors, inductors, and capacitors.

[0053] The access signal includes an AC signal in a first frequency band and an AC signal in a second frequency band, and the frequency of the first frequency band is higher than that of the second frequency band. The high-frequency path module 703 is arranged at the subsequent stage of the attenuation network 702 and can extract, optimize, and transmit the high-frequency signal circuit. The high-frequency path module 703 is used to extract and optimize the AC signal in the first frequency band in the access signal, reducing the attenuation and distortion of the high-frequency signal. Exemplarily, the high-frequency path module 703 can use a device that passes AC and blocks DC to extract the high-frequency signal. For example, the device that passes AC and blocks DC can be a capacitor or a combined circuit of a capacitor and other devices. Opposite to the high-frequency path module 703, the low-frequency path module 704 is a low-frequency signal extraction and transmission circuit arranged at the subsequent stage of the attenuation network 702, and is used to extract and stably transmit the DC signal and the AC signal in the second frequency band in the access signal. When the voltage bias module 706 is provided in the main body circuit 701, the low-frequency path module 704 can also cancel at least part of the DC signal passing through it according to the bias voltage provided by the voltage bias module 706, so that the electrical signal output by the main body circuit 701 matches the requirements of the signal measuring instrument 708. Exemplarily, the low-frequency path module 704 can use at least one of an operational amplifier circuit, a junction field effect transistor, and an adder to implement the extraction, cancellation, and transmission of the low-frequency signal. The voltage bias module 706 can generate a corresponding bias voltage according to the bias control signal of the signal measuring instrument and provide it to the low-frequency path module. Exemplarily, the signal measuring instrument 708 can include an oscilloscope.

[0054] The impedance transformation module 705 is respectively connected to the signals output by the high-frequency path module 703 and the low-frequency path module 704, combines the two signals, and provides a compensation impedance to compensate the impedance of the source end (that is, the end connected to the impedance transformation module 705) of the coaxial cable 707, so that the source end impedance and the terminal impedance of the subsequent coaxial cable 707 can be matched. The technical solution for providing a compensation impedance for the coaxial cable 707 here is an existing technology and will not be elaborated here.

[0055] Figure 9 It is a frequency response curve graph of a signal acquisition probe provided by an embodiment of the present invention. Figure 10 It is a comparison graph of a first frequency response curve and a second frequency response curve provided by an embodiment of the present invention, wherein Figure 10 the first frequency response curve 1101 shown in Figure 9 is the frequency response curve of the signal acquisition probe in the embodiment of the present invention in Figure 2 , and the second frequency response curve 1102 is Figure 6 、 Figure 9 and Figure 10, the signal acquisition probe 700 proposed by the present utility model adds a high-frequency path module 703 and a low-frequency path module 704 to optimize and transmit signals of different frequency bands respectively. Figure 10 In the comparison diagram, the first frequency response curve 1101 is smoother than the second frequency response curve 1102. Thus, it can be obtained that the signal acquisition probe 700 of the present application has stronger processing ability for signals of different frequencies compared with the signal acquisition probe of the same size and other components in the prior art, thereby improving the measurement accuracy of the signals.

[0056] The signal acquisition probe and its probe provided by the present utility model are provided with an external connection part and an internal connection part connected in sequence. One end of the external connection part far from the internal connection part is used to externally connect the signal source to be measured; one end of the internal connection part far from the external connection part is used to connect the main body circuit of the signal acquisition probe. The extension direction of the internal connection part is different from at least part of the extension direction of the external connection part. The cross-sectional area of one end of the external connection part close to the internal connection part is larger than the cross-sectional areas of the other end of the external connection part and the internal connection part, realizing the combination of the bent structure and the structure with a thick middle and thin ends of the probe. This structure greatly reduces the parasitic inductance, thereby improving the measurement accuracy and stability.

[0057] The above specific implementation manners do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A probe of a signal acquisition probe, characterized in that, Comprising: An externally connected part and an internally connected part connected in sequence; One end of the externally connected part far from the internally connected part is used to externally connect a signal source to be measured; One end of the internally connected part far from the externally connected part is used to connect the body circuit of the signal acquisition probe; The extending direction of the internally connected part is different from at least part of the extending direction of the externally connected part; The cross-sectional area of one end of the externally connected part close to the internally connected part is larger than the cross-sectional area of the other end of the externally connected part and the cross-sectional area of the internally connected part.

2. The probe of the signal acquisition probe according to claim 1, characterized in that, The externally connected part includes a middle section and an end section, and the middle section is connected between the end section and the internally connected part; The extending direction of the end section is the same as that of the internally connected part and different from that of the middle section.

3. The probe of the signal acquisition probe according to claim 2, characterized in that, The cross-sectional area of the middle section is larger than the cross-sectional area of the end section and the cross-sectional area of the internally connected part.

4. The probe of the signal acquisition probe according to claim 1, characterized in that The externally connected part includes a sleeve part and an internal part, the first end of the internal part is connected to the internally connected part, and the second end of the internal part is used to externally connect a signal source to be measured; The sleeve part is sleeved on the outside of the first end of the internal part and contacts the outside of the first end of the internal part.

5. The probe of the signal acquisition probe according to claim 4, characterized in that The sleeve part includes a metal sleeve and / or a metal wire winding part.

6. The probe of the signal acquisition probe according to claim 4, characterized in that, The internal part is provided with a first section and a second section; The first section is the section of the internal part arranged inside the sleeve part, and the second section is the section of the internal part arranged outside the sleeve part; The extending direction of the second section is the same as that of the internally connected part and different from that of the first section.

7. The probe of the signal acquisition probe according to any one of claims 1-6, characterized in that One end of the externally connected part far from the internally connected part is a conical tip.

8. A signal acquisition probe, characterized in that, Comprising: The probe according to any one of claims 1-7 and the body circuit; The body circuit includes an attenuation network, a high-frequency path module, a low-frequency path module, an impedance transformation module and a coaxial cable; The input end of the attenuation network is connected to the internally connected part of the probe; The output end of the attenuation network is connected to the impedance transformation module through the high-frequency path module and the low-frequency path module respectively; The impedance transformation module is also connected to the first end of the coaxial cable, and the second end of the coaxial cable is used to externally connect a signal measuring instrument.

9. The signal acquisition probe according to claim 8, wherein Further comprising: A voltage bias module; The first end of the voltage bias module is used to externally connect the signal measuring instrument to receive the bias control signal of the signal measuring instrument; The second end of the voltage bias module is connected to the low-frequency path module.

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