Handheld differential probe

Abstract

The invention discloses a handheld differential probe, which comprises a shell, two transmission lines, two probes, two connecting rods and an adjusting mechanism, and is characterized in that the two transmission lines are at least partially arranged in the shell; the two probes are correspondingly connected with the two transmission lines, and at least parts of the probes extend out of the shell; the two connecting rods are at least partially arranged in the shell, one end, far away from the probe, of each connecting rod is rotationally connected with the shell, and one end, close to the probe, of each connecting rod is connected with the transmission line; the adjusting mechanism is connected with the two connecting rods in a meshed mode, the adjusting mechanism rotates under the action of external force so as to adjust the distance between the two connecting rods, and the two connecting rods can drive the two transmission lines to move so that the distance between the two probes can be changed. The handheld differential probe provided by the invention is simple in structure and stable in adjustment.

Description

Technical Field

[0001] The invention relates to a handheld differential probe, belonging to the technical field of radio frequency microwave testing. Background Art

[0002] As the integration of circuit boards continues to increase, there are chips and other electronic components of various specifications, and the spacing of the pads of the circuit board test points is also different. Usually, there are probes with multiple pad spacings on the same circuit board. When using conventional probe testing, multiple probes with different spacings are required to meet all tests. During operation, probes with different spacings need to be frequently replaced, which is cumbersome.

[0003] In the related art, the adjustable spacing differential probe includes a probe holder platform assembly, a slide assembly, a probe holder assembly, an adapter assembly, a wire clamp assembly and two probes. The distance between the two probes can be adjusted through the probe holder platform assembly and the slide assembly. However, the structure is complex, with many parts, and multiple parts are prone to jamming when cooperating with each other, resulting in unstable adjustment. Summary of the invention

[0004] The object of the present invention is to provide a handheld differential probe with simple structure and stable adjustment.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A handheld differential probe, comprising:

[0007] shell;

[0008] two transmission lines, the two transmission lines being at least partially disposed within the housing;

[0009] Two probes, the two probes are connected to the two transmission lines respectively, and the probes at least partially extend out of the housing;

[0010] Two connecting rods, the two connecting rods are at least partially disposed in the housing, one end of each connecting rod away from the probe is rotatably connected to the housing, and one end of each connecting rod close to the probe is connected to the transmission line;

[0011] The adjusting mechanism is meshed and connected with the two connecting rods. The adjusting mechanism rotates under the action of external force to adjust the distance between the two connecting rods. The two connecting rods can drive the two transmission lines to move so that the distance between the two probes changes.

[0012] As a further improved technical solution of the present invention, the adjustment mechanism includes a transmission member and an adjustment roller connected to the transmission member, the transmission member includes two thread segments with opposite thread rotation directions, the two connecting rods include a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are both provided with matching holes, the two thread segments can extend into the two matching holes and engage with the threads in the matching holes, and the thread rotation direction of the matching hole of the first connecting rod is opposite to that of the matching hole of the second connecting rod.

[0013] As a further improved technical solution of the present invention, the matching hole includes a first hole segment and a second hole segment connected to the first hole segment, the inner diameter of the first hole segment is larger than the inner diameter of the second hole segment, the second hole segment is provided with a thread, and the threaded segment is sequentially passed through the first hole segment and the second hole segment.

[0014] As a further improved technical solution of the present invention, the shell includes a first shell and a second shell connected to the first shell, the first shell is provided with two connecting columns, the connecting rod is provided with a through hole, the connecting column is passed through the through hole and can rotate in the through hole.

[0015] As a further improved technical solution of the present invention, the connecting rod includes a rod body, a first connecting part connected to one end of the rod body, and a second connecting part connected to the other end of the rod body, the first connecting part is provided with a through hole for the transmission line to pass through, the through hole is provided in the second connecting part, and the axis of the through hole is perpendicular to the axis of the through hole.

[0016] As a further improved technical solution of the present invention, the rod body is provided with a third connecting portion, and along the width direction of the connecting rod, the matching hole at least partially penetrates the third connecting portion, and the third connecting portion is closer to the first connecting portion relative to the second connecting portion.

[0017] As a further improved technical solution of the present invention, the first shell includes a bottom wall portion, a first side wall portion connected to one side of the bottom wall portion, a second side wall portion connected to the other side of the bottom wall portion, and a first protrusion connected to the surface of the bottom wall portion. Along the width direction of the first shell, the first protrusion is located between the first side wall portion and the second side wall portion, and an installation space is enclosed between the first protrusion and the first side wall portion and between the first protrusion and the second side wall portion. The connecting rod is arranged in the installation space and can move within the installation space.

[0018] As a further improved technical solution of the present invention, the transmission line includes a semi-steel wire and a coaxial connector connected to the semi-steel wire, the coaxial connector is connected to the first shell, the semi-steel wire includes an inner conductor, an insulator and an outer conductor, the insulator covers the inner conductor, the outer conductor covers the insulator, and a portion of the inner conductor extends out of the insulator and forms the probe.

[0019] As a further improved technical solution of the present invention, the semi-steel wire includes a bending section, the bending section at least partially extends out of the outer shell, a part of the inner conductor of the bending section extends out of the insulator and forms the probe, the bending section is installed with a grounding connector, and the transmission line includes a grounding rod, which connects two of the grounding connectors.

[0020] As a further improved technical solution of the present invention, the coaxial connector includes an outer shell and a conductor assembly, the conductor assembly is at least partially disposed on the outer shell, the outer shell is provided with a flange portion, and the flange portion is connected to the first shell.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the handheld differential probe provided by the present invention includes two connecting rods and an adjusting mechanism, and the two connecting rods are driven to move by rotating the adjusting mechanism, and the two connecting rods drive the two transmission lines to move, thereby realizing a change in the spacing between the two probes, with fewer parts, a simple structure, and smooth adjustment without easy jamming; the adjusting mechanism is meshedly connected to the two connecting rods, and one end of the connecting rod away from the adjusting mechanism is rotatably connected to the outer shell, and the connecting rod is limited by the outer shell, so that the spacing adjustment between the two connecting rods is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional schematic diagram of a handheld differential probe of the present invention;

[0023] Figure 2 yes Figure 1 An exploded schematic diagram of the handheld differential probe shown;

[0024] Figure 3 yes Figure 2 A magnified schematic diagram of the middle A area;

[0025] Figure 4 yes Figure 2 Schematic diagram of the decomposition of

[0026] Figure 5 yes Figure 1 Another angle stereoscopic diagram;

[0027] Figure 6 yes Figure 5 Schematic diagram of the decomposition of

[0028] Figure 7 yes Figure 4 A top view of some components in the middle;

[0029] Figure 8 yes Figure 7 Schematic diagram of the decomposition of

[0030] Fig. 9 yes Figure 8 Schematic diagram of the partial component breakdown;

[0031] Fig.10 yes Fig. 9 A three-dimensional cross-sectional view of the middle connecting rod;

[0032] Fig.11 yes Figure 8 Cross-sectional view of the transmission line;

[0033] Fig.12 yes Fig.11 A magnified schematic diagram of the middle B area;

[0034] Fig.13 yes Fig.11 Enlarged schematic diagram of the middle C area;

[0035] Fig.14 yes Figure 7 Diagram of the state when the probe spacing increases. DETAILED DESCRIPTION

[0036] The exemplary embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. If there are several embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the drawings, unless otherwise specified, the same numbers in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments consistent with the present invention; on the contrary, they are only examples of devices, products and / or methods consistent with some aspects of the present invention as recorded in the claims of the present invention.

[0037] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the scope of protection of the present invention. The singular forms "a", "said" or "the" used in the specification and claims of the present invention are also intended to include plural forms, unless the context clearly indicates other meanings.

[0038] It should be understood that the words used in the specification and claims of the present invention, such as "first", "second" and similar words, do not indicate any order, quantity or importance, but are only used to distinguish the names of features. Similarly, words such as "one" or "an" do not indicate a quantitative limitation, but indicate the existence of at least one. Unless otherwise specified, words such as "front", "rear", "upper", "lower" and similar words appearing in the present invention are only for the convenience of explanation and are not limited to a specific position or a spatial orientation. Words such as "include" or "comprise" are an open-ended expression, meaning that the elements appearing before "include" or "comprise" include the elements appearing after "include" or "comprise" and their equivalents, which does not exclude that the elements appearing before "include" or "comprise" may also include other elements. If "several" appears in the present invention, it means two or more.

[0039] Please refer to Figures 1 to 14 As shown, the present invention discloses a handheld differential probe, including a housing 1, two transmission lines 2, two probes 3, two connecting rods 4 and an adjusting mechanism 5. The two transmission lines 2 and the two connecting rods 4 are at least partially arranged in the housing 1, that is, the housing 1 is used to protect the transmission lines 2 and the connecting rods 4. In addition, the housing 1 is also used for handholding. The two probes 3 are correspondingly connected to the two transmission lines 2, and the probes 3 at least partially extend out of the housing 1. The end of each connecting rod 4 away from the probes 3 is rotatably connected to the housing 1, and the end of each connecting rod 4 close to the probes 3 is connected to the transmission line 2. The adjusting mechanism 5 is meshedly connected to the two connecting rods 4. The adjusting mechanism 5 rotates under the action of an external force to adjust the spacing between the two connecting rods 4. The two connecting rods 4 can drive the two transmission lines 2 to move so that the spacing between the two probes 3 changes, so as to be suitable for various pad spacings of circuit boards and expand the scope of application.

[0040] See also Figure 4 The housing 1 includes a first housing 11 and a second housing 12, which are detachably connected to facilitate assembly of the entire differential probe. Specifically, the first housing 11 and the second housing 12 are detachably connected via a first fastener 71, which may be a bolt or a screw.

[0041] See also Figure 4The first housing 11 includes a bottom wall portion 111, a first side wall portion 112 connected to one side of the bottom wall portion 111, a second side wall portion 113 connected to the other side of the bottom wall portion 111, and a first protrusion 114 connected to the surface of the bottom wall portion 111. Along the width direction of the first housing 11, the first protrusion 114 is located between the first side wall portion 112 and the second side wall portion 113, and an installation space 1110 is enclosed between the first protrusion 114 and the first side wall portion 112 and between the first protrusion 114 and the second side wall portion 113. Two connecting rods 4 are arranged in the corresponding installation space 1110. The adjustment mechanism 5 drives the connecting rod 4 to move in the installation space 1110. The first protrusion 114, the first side wall portion 112, and the second side wall portion 113 are used to limit the maximum range of movement of the connecting rod 4.

[0042] See also Figure 6 The second housing 12 includes a top wall portion 121, a third side wall portion 122 connected to one side of the top wall portion 121, a fourth side wall portion 123 connected to the other side of the top wall portion 121, and a first docking protrusion 124 connected to the surface of the top wall portion 121. After the first housing 11 and the second housing 12 are assembled, the first protrusion 114 and the first docking protrusion 124 are abutted against each other and connected by the first fastener 71.

[0043] See also Figure 6 and Figure 8 The bottom wall portion 111 is also provided with a second protrusion 115, and the second protrusion 115 is provided with a first wire groove 1150. The top wall portion 121 is provided with a second docking protrusion 125, and the second docking protrusion 125 is provided with a second wire groove 1250. After the first shell 11 and the second shell 12 are assembled, the second protrusion 115 and the second docking protrusion 125 are abutted against each other and connected by the first fastener 71. The first wire groove 1150 and the second wire groove 1250 together constitute a wire hole for the transmission line 2 to pass through. By setting the wire hole, the transmission line 2 is limited.

[0044] See also Figure 2 The top wall portion 121 is also provided with a groove 1210, and the groove 1210 is used to install the label 13, and the label 13 is used to set the brand logo, product model and performance parameters.

[0045] See also Figure 2 The outer wall surfaces of the first side wall portion 112, the second side wall portion 113, the third side wall portion 122 and the fourth side wall portion 123 are provided with a plurality of long grooves 1120, so that the area provided with the long grooves 1120 forms an uneven structure to prevent the user's hand from slipping during holding.

[0046] See also Figure 5 The transmission line 2 includes a semi-steel line 21 and a coaxial connector 22 connected to the semi-steel line 21 , and the coaxial connector 22 is connected to the first shell 11 .

[0047] In this embodiment, see Fig.12 The semi-steel wire 21 includes an inner conductor 21a, an insulator 21b and an outer conductor 21c. The insulator 21b covers the inner conductor 21a, and the outer conductor 21c covers the insulator 21b. A part of the inner conductor 21a extends out of the insulator 21b and forms a probe 3. During the manufacturing process, the insulator 21b and the outer conductor 21c at one end of the semi-steel wire 21 are peeled off to expose the inner conductor 21a, and this part is used as the probe 3 by the conductor 21a. In the related art, the probe and the semi-steel wire are separately provided. During the manufacturing process, the inner conductor of the semi-steel wire needs to be assembled with the probe and fixed by welding. Due to the small size of the probe, the production of the jack requires compact equipment, and the equipment cost is high, resulting in high manufacturing cost and complicated process. In addition, the connection between the inner conductor of the semi-steel wire and the probe is unstable, resulting in unstable signal transmission and unstable performance. The present invention forms a probe 3 by stripping off the insulator 21b and the outer conductor 21c at one end of the semi-steel wire 21, exposing the inner conductor 21a, thereby saving the step of connecting the probe 3 with the semi-steel wire 21, simplifying the process, and saving costs; in addition, the probe 3 and the semi-steel wire 21 are integrally arranged, the signal transmission stability is good, and the use performance is stable. Specifically, the probe 3 includes a needle tip 31, and the needle tip 31 is used to contact the object to be measured.

[0048] For details, see Fig.11 The semi-steel wire 21 includes a main body section 211 and a bent section 212 connected to the main body section 211. The coaxial connector 22 is connected to the main body section 211. The main body section 211 is located in the housing 1 and passes through the wire hole. The main body section 211 is connected to the connecting rod 4. The bent section 212 at least partially extends out of the housing 1. The insulator 21b and the outer conductor 21c of a part of the bent section 212 are stripped, and the exposed portion of the outer conductor 21c forms the probe 3.

[0049] Specifically, the two bending sections 212 extend obliquely from the two main sections 211 towards each other, so that the distance between the two probes 3 is shortened. The two main sections 211 are driven to move by the adjustment mechanism 5 to adjust the distance between the two probes 3.

[0050] See also Fig. 9 The bending section 212 is provided with a grounding connector 23, and the transmission line 2 includes a grounding rod 24, which connects two grounding connectors 23. Fig.12 The grounding connector 23 includes a cylinder 231 and a block 232 connected to the cylinder 231 . Each block 232 is provided with an inclined hole 230 . The grounding rod 24 passes through two inclined holes 230 , wherein the inclined hole 230 refers to a hole inclined relative to the axis of the grounding connector 23 .

[0051] See also Fig.13The coaxial connector 22 includes an outer shell 221 and a conductor assembly 222. The conductor assembly 222 is at least partially disposed on the outer shell 221. The outer shell 221 is provided with a flange portion 2211. The flange portion 2211 is connected to the first shell 11 through a second fastener 72. The second fastener 72 is a bolt or a screw. For details, see Figure 6 The first housing 11 is provided with three third protrusions 116, which are respectively connected to the first side wall 112, the second side wall 113 and the bottom wall 111. The two coaxial connectors 22 are at least partially installed in the interval between the three third protrusions 116, and the two third protrusions 116 located on both sides are provided with a slot 1161. The flange 2211 is installed in the slot 1161 and connected to the third protrusion 1161 through the second fastener 72. The top wall 121 of the second housing 12 abuts against the third protrusion 1161 and is connected through the first fastener 71.

[0052] See also Fig. 9 The first connecting rod 4a and the second connecting rod 4b each include a rod body 41, a first connecting portion 42 connected to one end of the rod body 41, and a second connecting portion 43 connected to the other end of the rod body 41. The first connecting portion 42 is provided with a through hole 420 for the transmission line 2 to pass through, and the transmission line 2 can move forward and backward in the through hole 420. In the related art, the semi-steel wire is fixed to the connecting rod by welding a connecting block on the semi-steel wire, and the connecting block is connected to the connecting rod, but welding on the semi-steel wire will affect the transmission performance of the wire. In the present invention, the through hole 420 is provided on the connecting rod 4, and the transmission line 2 is passed through the through hole 420. The transmission line 2 and the connecting rod 4 can slide relative to each other forward and backward, which has no effect on the performance of the transmission line 2; in addition, there is no need to weld the connecting block, which simplifies the process and reduces the cost.

[0053] See also Fig. 9 The second connecting portion 43 is provided with a through hole 430, and the bottom wall portion 111 of the first shell 11 is provided with two connecting posts 1111, which are passed through the through hole 430 and can rotate in the through hole 430. The end of the connecting rod 4 away from the probe 3 is limited by the shell 1, so that the spacing adjustment between the two connecting rods 4 is more stable. In the related art, the connecting rod is connected to the shell by screws. The screw fixation has high requirements on the depth of the groove. In addition, the outer diameter tolerance of the screw thread is large, which will cause the connecting rod to shake more. The present invention cancels the screw fixation, facilitates assembly, and has precise tolerance control.

[0054] In this embodiment, the axis of the through hole 430 is perpendicular to the axis of the through hole 420. Specifically, the through hole 430 penetrates the upper and lower surfaces of the connecting rod 4 along the height direction of the connecting rod 4, the first connecting portion 42 extends outward relative to the rod body 41 along the width direction of the connecting rod 4, and the through hole 420 penetrates the first connecting portion 42 along the length direction of the connecting rod 4.

[0055] See also Fig. 9The connecting rod 4 is provided with a matching hole 410, and the matching hole 410 is used to connect the adjusting mechanism 5. The rod body 41 is provided with a third connecting portion 411, and along the width direction of the connecting rod 4, the matching hole 410 at least partially penetrates the third connecting portion 411, and the third connecting portion 411 is closer to the first connecting portion 42 relative to the second connecting portion 43. By arranging the matching hole 410 close to the first connecting portion 21, that is, the adjusting mechanism 5 is close to the probe 3, the distance between the two probes 3 can be easily adjusted.

[0056] See also Figure 4 The adjustment mechanism 5 includes a transmission member 51 and an adjustment roller 52 connected to the transmission member 51. The top wall portion 121 of the second shell 12 is provided with a through hole 1211. The adjustment roller 52 at least partially extends out of the through hole 1211. The user adjusts the position by turning the adjustment roller 52 extending out of the through hole 1211.

[0057] See also Fig. 9 , the transmission member 51 includes two thread segments 511 with opposite thread rotation directions, and the two connecting rods 4 include a first connecting rod 4a and a second connecting rod 4b, and the first connecting rod 4a and the second connecting rod 4b are mirror images of each other. The first connecting rod 4a and the second connecting rod 4b are both provided with matching holes 410, and the two thread segments 511 can extend into the two matching holes 410 and be engaged with the threads in the matching holes 410. The thread rotation direction of the matching hole 410 of the first connecting rod 4a is opposite to the thread rotation direction of the matching hole 410 of the second connecting rod 4b. When adjusting, the transmission member 51 is rotated by turning the adjustment roller 52 forward. Since the two thread segments 511 of the transmission member 51 have opposite thread rotation directions, the threads of the thread segments 511 are engaged with the threads of the matching holes 410, so that the two connecting rods 4 are brought closer to each other, and the distance between the two probes 3 is reduced; the transmission member 51 is rotated in the opposite direction by turning the adjustment roller 52 backward, so that the two connecting rods 4 are moved away from each other, and the distance between the two probes 3 is increased. The present invention drives the two connecting rods 4 to move by rotating the adjustment mechanism 5, and the two connecting rods 4 drive the two transmission lines 2 to move, so that the distance between the two probes 3 is changed, so that the user can arbitrarily adjust the distance between the two probes 3 within a certain range (such as 500-4000um or a smaller range such as 200-3000um). It has few parts, a simple structure, is easy to assemble, and is smooth to adjust without being stuck.

[0058] See also Fig.10 The matching hole 410 includes a first hole section 4101 and a second hole section 4102 connected to the first hole section 4101. The inner diameter of the first hole section 4101 is larger than the inner diameter of the second hole section 4102. The second hole section 4102 is provided with a thread. The threaded section 511 is sequentially inserted into the first hole section 4101 and the second hole section 4102. This is equivalent to providing a clearance arrangement for the hole section close to the adjusting roller 52, so as to prevent the hole wall of the matching hole 410 from being stuck to the thread of the threaded section 511 when the connecting rod 4 and the transmission member 51 are eccentrically tilted relative to each other.

[0059] See also Figure 1 and Figure 2 The handheld differential probe further includes a shell cap 6 , which is connected to the housing 1 . The shell cap 6 is used to wrap the probe 3 to protect the probe 3 .

[0060] The above implementation modes are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of the present invention should be based on the technical personnel in the relevant technical field. Although the present invention has been described in detail in this specification with reference to the above implementation modes, the ordinary technical personnel in the field should understand that the technical personnel in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A handheld differential probe, characterized in that: include: Housing (1); as well as, Two transmission lines (2), the two transmission lines (2) being at least partially disposed in the housing (1); Two probes (3), the two probes (3) being connected to the two transmission lines (2) respectively, and the probes (3) at least partially extending out of the housing (1); two connecting rods (4), the two connecting rods (4) being at least partially disposed in the housing (1), one end of each connecting rod (4) away from the probe (3) being rotatably connected to the housing (1), and one end of each connecting rod (4) close to the probe (3) being connected to the transmission line (2); An adjusting mechanism (5) is meshedly connected with the two connecting rods (4). The adjusting mechanism (5) rotates under the action of an external force to adjust the distance between the two connecting rods (4). The two connecting rods (4) can drive the two transmission lines (2) to move, so that the distance between the two probes (3) changes.

2. The handheld differential probe according to claim 1, characterized in that: The adjustment mechanism (5) comprises a transmission member (51) and an adjustment roller (52) connected to the transmission member (51); the transmission member (51) comprises two thread segments (511) with opposite thread rotation directions; the two connecting rods (4) are respectively a first connecting rod (4a) and a second connecting rod (4b); the first connecting rod (4a) and the second connecting rod (4b) are both provided with matching holes (410); the two thread segments (511) can be respectively inserted into the two matching holes (410) and meshed with the threads in the matching holes (410); the thread rotation direction of the matching hole (410) of the first connecting rod (4a) is opposite to the thread rotation direction of the matching hole (410) of the second connecting rod (4b).

3. The handheld differential probe according to claim 2, characterized in that: The matching hole (410) comprises a first hole section (4101) and a second hole section (4102) connected to the first hole section (4101), the inner diameter of the first hole section (4101) is larger than the inner diameter of the second hole section (4102), the second hole section (4102) is provided with a thread, and the thread section (511) is sequentially penetrated through the first hole section (4101) and the second hole section (4102).

4. The handheld differential probe according to claim 2, characterized in that: The housing (1) comprises a first shell (11) and a second shell (12) connected to the first shell (11); the first shell (11) is provided with two connecting columns (1111); the connecting rod (4) is provided with a through hole (430); the connecting column (1111) is passed through the through hole (430) and is capable of rotating in the through hole (430).

5. The handheld differential probe according to claim 4, characterized in that: The first connecting rod (4a) and the second connecting rod (4b) both comprise a rod body (41), a first connecting portion (42) connected to one end of the rod body (41), and a second connecting portion (43) connected to the other end of the rod body (41), the first connecting portion (42) being provided with a through hole (420) for the transmission line (2) to pass through, the through hole (430) being provided in the second connecting portion (43), and the axis of the through hole (430) being perpendicular to the axis of the through hole (420).

6. The handheld differential probe according to claim 5, characterized in that: The rod body (41) is provided with a third connecting portion (411), and along the width direction of the connecting rod (4), the matching hole (410) at least partially penetrates the third connecting portion (411), and the third connecting portion (411) is closer to the first connecting portion (42) relative to the second connecting portion (43).

7. The handheld differential probe according to claim 4, characterized in that: The first shell (11) comprises a bottom wall portion (111), a first side wall portion (112) connected to one side of the bottom wall portion (111), a second side wall portion (113) connected to the other side of the bottom wall portion (111), and a first protrusion (114) connected to the surface of the bottom wall portion (111); along the width direction of the first shell (11), the first protrusion (114) is located between the first side wall portion (112) and the second side wall portion (113); an installation space (1110) is enclosed between the first protrusion (114) and the first side wall portion (112) and between the first protrusion (114) and the second side wall portion (113); the connecting rod (4) is arranged in the installation space (1110) and can move in the installation space (1110).

8. The handheld differential probe according to claim 4, characterized in that: The transmission line (2) comprises a semi-steel wire (21) and a coaxial connector (22) connected to the semi-steel wire (21); the coaxial connector (22) is connected to the first shell (11); the semi-steel wire (21) comprises an inner conductor (21a), an insulator (21b) and an outer conductor 21c; the insulator (21b) covers the inner conductor (21a); ​​the outer conductor (21c) covers the insulator (21b); a portion of the inner conductor (21a) extends out of the insulator (21b) and forms the probe (3).

9. The handheld differential probe according to claim 8, characterized in that: The semi-steel wire (21) comprises a bent section (212), wherein the bent section (212) at least partially extends out of the housing (1), a portion of the inner conductor (21a) of the bent section (212) extends out of the insulator (21b) and forms the probe (3), the bent section (212) is provided with a grounding connector (23), and the transmission line (2) comprises a grounding rod (24), wherein the grounding rod (24) connects two of the grounding connectors (23).

10. The handheld differential probe according to claim 8, characterized in that: The coaxial connector (22) comprises an outer shell (221) and a conductor assembly (222), wherein the conductor assembly (222) is at least partially disposed on the outer shell (221), and the outer shell (221) is provided with a flange portion (2211), wherein the flange portion (2211) is connected to the first shell (11).

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