Universal meter pen with telescopic structure and use method thereof

Abstract

The invention discloses a universal meter pen with a telescopic structure and a use method thereof in the field of universal meters, and the universal meter pen comprises a meter pen outer shell, a handheld buckling shell, a telescopic protection sleeve body and a meter hand, and the meter pen outer shell and the handheld buckling shell are internally provided with an inner ring sleeve; the inner ring sleeve is connected with the meter pen outer shell in a buckle buckling mode, and the telescopic protective sleeve body is movably arranged in the handheld buckling shell. The rotary boss on the rotary clamping sleeve is matched with the guide inclined table and the limiting inclined table on the inner wall of the handheld buckling shell, and a pressing-rotating-limiting linkage mechanism is formed in combination with the pre-pressing force of the spring. When the telescopic protective sleeve body is pressed, the rotary boss slides and rotates along the guide inclined table and accurately falls into the guide limiting groove or the limiting inclined table to achieve positioning, the problem that a traditional sleeve type telescopic structure accidentally stretches out and draws back due to insufficient friction force is solved, and it is ensured that the length of a meter hand is stable in the measuring process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of multimeter, in particular to a multimeter probe with telescopic structure and a method for using the same. BACKGROUND

[0002] Multimeters are widely used to measure resistance, current, voltage, transistor characteristics, etc., and are commonly used measuring tools for electricians and electronic technicians. As a basic tool in the field of electronic measurement, the probe of a multimeter is a core component for realizing the detection of electrical parameters, and directly affects the measurement accuracy and operational safety. In the prior art, the multimeter probe has the following defects:

[0003] Fixed needle length or unstable telescopic structure: Traditional probes are mostly of fixed length, and the needle is easy to bend or break due to collision when carrying; some telescopic probes use a simple sleeve structure and rely on friction for positioning, and accidental telescoping may occur due to vibration or accidental touch during use, resulting in interrupted measurement or even damage to the needle.

[0004] Poor compatibility of protection and operation: Most existing protective sleeves are of separate design and need to be manually disassembled during use, and are easy to lose when idle; some integrated protective sleeves have poor telescopic linkage with the needle, and cannot completely wrap the needle when stored, or hinder the contact of the measurement contact when extended.

[0005] Loose structure affecting measurement accuracy: The connection between the internal connecting wire and the needle is prone to poor contact due to frequent telescoping, and the clamping structure of the shell and the handheld part is prone to loosening, resulting in increased resistance and affecting the detection accuracy of small currents or voltages.

[0006] Operation jamming and response lag: The guide and limiting design of some telescopic structures is unreasonable, and jamming may occur during rotation or pressing adjustment, especially when measuring in a small space (such as a densely packed circuit board), the operation smoothness is severely insufficient.

[0007] Therefore, the present application provides a multimeter probe with telescopic structure and a method for using the same to solve the problems raised in the background art. SUMMARY

[0008] The present application aims to provide a multimeter probe with telescopic structure and a method for using the same to solve the problems raised in the background art.

[0009] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0010] A universal meter pen with telescopic structure and its using method, including the meter pen shell, the hand-held buckle shell, the telescopic protective sleeve and the meter needle, the inner ring sleeve is arranged in the meter pen shell and the hand-held buckle shell, the inner ring sleeve and the meter pen shell are connected by the buckle buckle mode, the telescopic protective sleeve is arranged in the hand-held buckle shell, the meter needle is arranged in the inner ring sleeve and the inner hole of the telescopic protective sleeve, the rotating sleeve is fixedly connected on the outer wall of the meter needle;

[0011] A plurality of vertical rotating bosses are integrally formed on the circumferential direction of the rotating sleeve side wall, the rotating boss top is integrally formed with a rotating top matching inclined table, the rotating top matching inclined table is in the shape of an inverted V, the telescopic protective sleeve end is provided with an end top tooth matched with the rotating top matching inclined table, and the side wall of the rotating sleeve is integrally formed with a telescopic limiting clamping block, a plurality of vertical protrusions are equidistantly arranged on the inner wall of the hand-held buckle shell in the circumferential direction, the vertical protrusions are integrally formed with a guide limiting groove, a guide groove is arranged on the inner wall of the vertical protrusion, the guide groove and the guide limiting groove are slidably connected with the telescopic limiting clamping block, the guide limiting groove is slidably connected with the rotating boss, a guide inclined table is integrally formed on the top of the vertical protrusion on one side of the guide groove, the guide inclined table is matched with the rotating top matching inclined table, a limiting inclined table matched with the rotating top matching inclined table is integrally formed on the end of the vertical protrusion on the other side of the guide groove, and the spring is clamped and pressed between the rotating boss and the inner wall clamping table of the inner ring sleeve on the periphery of the rotating sleeve on the outer wall of the meter needle.

[0012] As a further scheme of the application, an inner ring sleeve is integrally formed on the outer wall of the inner ring sleeve, a buckle columnar groove is arranged on the buckle table, a buckle groove matched with the buckle columnar groove is arranged on the inner wall of the hand-held buckle shell, and a buckle columnar protrusion matched with the buckle columnar groove is integrally formed on the buckle groove.

[0013] As a further scheme of the application, a holding anti-skid pattern is arranged on the side wall of the meter needle shell, a connecting line is fixedly connected in the meter pen shell, the other end of the connecting line is electrically connected with the meter needle after penetrating through the inner ring sleeve, and the other end of the connecting line is connected with an external detection device.

[0014] As a further scheme of the application, a clamping ring is integrally formed on the inner wall top of the telescopic protective sleeve, and an annular movable groove for limiting the clamping ring is arranged on the outer wall bottom of the rotating sleeve.

[0015] As a further scheme of the application, the inclination angle of the rotating top matching inclined table is 25°-35°, and the tooth-shaped plane structure of the end top tooth.

[0016] As a further scheme of the present application: the diameter of the clasp columnar convex is 2.5-3.5mm, the height is 1.2-1.8mm, and the depth of the clasp columnar groove is 1.1-1.3 times of the height of the clasp columnar convex.

[0017] As a further scheme of the present application: the pre-pressing amount of the spring is 1 / 4-1 / 3 of the free length, and the spring stiffness is 0.5-1.5N / mm.

[0018] The use method of the universal meter pen with telescopic structure comprises the following steps:

[0019] 1) Assembly steps:

[0020] ① Insert the inner ring sleeve into the handheld clasp shell, so that the clasp platform is clamped into the clasp groove, and the clasp columnar convex is embedded into the clasp columnar groove;

[0021] ② Insert the spring into the telescopic protective sleeve, and then insert the telescopic protective sleeve into the pen shell, so that the telescopic limiting clamping block is clamped into the limiting sliding groove;

[0022] ③ Install the rotating clamping sleeve, so that the rotating convex platform is preliminarily engaged with the end top tooth;

[0023] ④ Connect the pointer and the connecting line, insert the pointer into the telescopic protective sleeve, and position it through the ring groove;

[0024] ⑤ Clasp the handheld clasp shell and the pen shell;

[0025] 2) Telescopic adjustment steps:

[0026] ① Press the telescopic protective sleeve, which can push the pointer and the rotating clamping sleeve upward together through the cooperation of the end top tooth and the rotating convex platform on the rotating clamping sleeve, compress the spring, and when the rotating convex platform moves from the guiding limiting groove to the top of the guiding inclined platform, the rotating clamping sleeve can be driven to rotate under the guidance of the limiting inclined platform and the compression of the spring, so that the rotating convex platform on the outer wall of the rotating clamping sleeve falls on the limiting inclined platform for vertical limiting. At the same time, the telescopic limiting clamping block on the outer wall of the telescopic protective sleeve slides in the guiding groove and continues to move downward, thereby realizing the contraction and storage of the pointer;

[0027] ② When the telescopic protective sleeve body is pressed again, the end top tooth can further cooperate with the rotating boss on the rotating sleeve to push the pointer and the rotating sleeve to move upward together, compress the spring, and when the rotating boss moves from the guide groove to the top of the guide inclined table, the rotating sleeve can be driven to rotate under the guidance of the guide inclined table and the compression of the spring, so that the rotating boss on the outer wall of the rotating sleeve falls into the guide limiting groove, the telescopic limiting block on the outer wall of the telescopic protective sleeve body and the rotating boss slide in the guide groove, and continue to move downward, thereby realizing the extension of the pointer.

[0028] Compared with the prior art, the beneficial effects of the present application are:

[0029] 1、The rotating boss on the rotating sleeve cooperates with the guide inclined table and the limiting inclined table in the inner wall of the handheld buckle shell, and the pre-compression of the spring forms a "pressing-rotating-limiting" linkage mechanism. When the telescopic protective sleeve body is pressed, the rotating boss slides along the guide inclined table and rotates, accurately falls into the guide limiting groove or the limiting inclined table to realize positioning, solves the accidental telescopic problem caused by insufficient friction of the traditional sleeve type telescopic structure, and ensures the stability of the pointer length during measurement.

[0030] 2、In the present application, the telescopic protective sleeve body telescopes synchronously with the pointer, completely wraps the tip of the pointer when stored, avoids collision damage during carrying or idling, and only exposes the measurement contact point when extended. The side wall of the protective sleeve body can block dust and liquid from invading the connection part of the pointer and the connecting line, solving the problem of easy loss or incomplete protection of the traditional watch pen protective sleeve.

[0031] 3、In the present application, the rotating top inclined table is designed with an inclination angle of 25°-35°, cooperates with the tooth shape plane of the end top tooth, reduces the rotating resistance, makes the pressing-telescopic action respond quickly, and increases the friction coefficient of the outer wall of the handheld buckle shell to enable stable holding in oily or humid environments, adapt to various scenes such as industrial sites and laboratories, and facilitate one-handed operation in narrow spaces. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 is a structural schematic diagram of the present application;

[0033] Fig. 2 is an exploded view of the present application;

[0034] Fig. 3 is a sectional exploded view of the present application;

[0035] Fig. 4 is a sectional exploded view of the present application Fig. 3 is a sectional exploded view of the present application

[0036] Fig. 5 is a sectional structure schematic diagram of the handheld buckle shell in the present application.

[0037] In the figure: 1, the watch pen outer shell; 101, the anti-skid pattern of holding; 2, the hand-held buckle shell; 201, the vertical convex body; 202, the guide inclined table; 203, the buckle groove; 204, the buckle cylindrical convex; 205, the guide groove; 206, the guide limiting groove; 207, the limiting inclined table; 3, the telescopic protective sleeve body; 301, the telescopic limiting clamping block; 302, the end top tooth; 303, the clamping ring; 4, the watch needle; 401, the ring groove; 5, the connecting line; 6, the inner ring sleeve; 601, the buckle table; 602, the buckle cylindrical groove; 7, the spring; 8, the rotating clamping sleeve; 801, the rotating boss; 802, the rotating top matching inclined table; 803, the annular movable groove. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0039] Please refer to Figs. 1-5 In the embodiments of the present application, the universal watch pen with telescopic structure and the use method thereof include a watch pen outer shell 1, a hand-held buckle shell 2, a telescopic protective sleeve body 3 and a watch needle 4. The watch pen outer shell 1 and the hand-held buckle shell 2 are internally provided with an inner ring sleeve 6. The inner ring sleeve 6 is connected with the watch pen outer shell 1 in a buckle buckling manner. The telescopic protective sleeve body 3 is movably arranged in the hand-held buckle shell 2. The watch needle 4 is movably arranged in the inner hole of the inner ring sleeve 6 and the telescopic protective sleeve body 3. The watch needle 4 is fixedly connected with a rotating clamping sleeve 8 on the outer wall.

[0040] A plurality of vertical rotating bosses 801 are integrally formed on the side wall of the rotating sleeve 8 in the circumferential direction, a rotating top matching ramp 802 is integrally formed on the top of the rotating boss 801, and the rotating top matching ramp 802 is in a herringbone structure. An end top tooth 302 is provided at the end of the telescopic protective sleeve 3 to cooperate with the rotating top matching ramp 802, and a telescopic limiting block 301 is integrally formed on the side wall of the rotating sleeve 8. A plurality of vertical protrusions 201 are provided on the inner wall of the hand-held snap-fit ​​shell 2 at equal intervals in the circumferential direction, and a guide limiting groove 206 is integrally formed between the vertical protrusions 201. A guide groove 206 is provided on the inner wall of the vertical protrusion 201. The guide groove 205, the guide groove 205 and the guide limit groove 206 are all slidably connected to the telescopic limit block 301, the guide limit groove 206 is slidably connected to the rotating boss 801, the top of the vertical protrusion 201 is located on one side of the guide groove 205 and is integrally formed with a guide ramp 202, the guide ramp 202 cooperates with the rotating top matching ramp 802, the end of the vertical protrusion 201 is located on the other side of the guide groove 205 and is integrally formed with a limit ramp 207 that cooperates with the rotating top matching ramp 802, the outer periphery of the rotating sleeve 8 on the outer wall of the pointer 4 is located between the rotating boss 801 and the inner wall clamping platform of the inner ring 6, and a spring 7 is clamped.

[0041] In this embodiment, the test lead housing 1 is injection-molded with ABS engineering plastic, with a wall thickness of 2.5 mm. The surface is laser-engraved to form grip anti-slip lines 101 with a depth of 0.3 mm and a spacing of 1.5 mm. It has both insulation and impact resistance, with an impact strength of ≥20 kJ / m².

[0042] Pointer 4: Precision-machined from a high-purity copper alloy with a copper content of ≥99.5%. The tip has a diameter of 0.3mm, ensuring contact in a narrow contact point. The tail is soldered to a multi-strand copper shielded wire with a diameter of 0.5mm². The shield is grounded to reduce electromagnetic interference.

[0043] Rotating ferrule 8 and telescopic protective sleeve 3: The rotating ferrule 8 is made of polyoxymethylene (POM) material, which is self-lubricating and reduces rotational friction. The telescopic protective sleeve 3 is made of transparent polycarbonate (PC) with a wall thickness of 1mm, allowing for intuitive observation of the status of the needle 4. It also has a temperature resistance range of -30°C to 80°C, making it suitable for measurements in high and low temperature environments.

[0044] Spring 7: 65Mn spring 7 steel, wire diameter 0.8mm, free length 20mm, preload 5mm, compressed to 15mm, ensure that the elastic force attenuation rate is ≤5% after 1000 expansions and contractions in an environment of -20℃~60℃

[0045] The inner ring sleeve 6 is integrally formed with a buckling table 601 on the outer wall, the buckling table 601 is provided with a buckling cylindrical groove 602, the handheld buckling shell 2 is provided with a buckling groove 203 matched with the buckling table 601, and the buckling groove 203 is integrally formed with a buckling cylindrical protrusion 204 matched with the buckling cylindrical groove 602.

[0046] The outer shell sidewall of the watch pointer 4 is provided with a holding anti-skid line 101, the watch pen outer shell 1 is fixedly connected with a connecting line 5, the other end of the connecting line 5 is electrically connected with the watch pointer 4 after penetrating through the inner ring sleeve 6, and the other end of the connecting line 5 is connected with an external detection device.

[0047] The inner wall of the telescopic protective sleeve body 3 is integrally formed with a clamping ring 303, and the outer wall of the rotating clamping sleeve 8 is provided with an annular movable groove 803 for limiting the clamping ring 303.

[0048] The inclination angle of the rotating top matching inclined table 802 is 25°-35°, and the tooth shape plane structure of the end top tooth 302 can ensure that the rotating boss 801 and the telescopic limiting clamping block 301 can quickly realize rotation response.

[0049] The diameter of the buckling cylindrical protrusion 204 is 2.5-3.5mm, the height is 1.2-1.8mm, and the depth of the buckling cylindrical groove 602 is 1.1-1.3 times the height of the buckling cylindrical protrusion 204.

[0050] The pre-pressing amount of the spring 7 is 1 / 4-1 / 3 of the free length, and the stiffness of the spring 7 is 0.5-1.5N / mm, so that the rotating clamping sleeve 8 has sufficient rebounding force.

[0051] The use method of the universal watch pen with a telescopic structure comprises the following steps:

[0052] 1) Assembly step:

[0053] ①Insert the inner ring sleeve 6 into the handheld buckling shell 2, so that the buckling table 601 is clamped into the buckling groove 203, and the buckling cylindrical protrusion 204 is embedded into the buckling cylindrical groove 602;

[0054] ②Sleeve the spring 7 into the telescopic protective sleeve body 3, and then insert the telescopic protective sleeve body 3 into the watch pen outer shell 1, so that the telescopic limiting clamping block 301 is clamped into the limiting sliding groove;

[0055] ③Install the rotating clamping sleeve 8, so that the rotating boss 801 is preliminarily engaged with the end top tooth 302;

[0056] ④Connect the watch pointer 4 with the connecting line 5, insert the watch pointer 4 into the telescopic protective sleeve body 3, and position it through the ring groove 401;

[0057] ⑤Buckle the handheld buckling shell 2 with the watch pen outer shell 1.

[0058] 2) Telescopic adjustment steps:

[0059] ① Pressing the telescopic protective sleeve 3, the top teeth 302 at the end can cooperate with the rotating boss 801 on the rotating sleeve 8, pushing the pointer 4 and the rotating sleeve 8 to move upward together, compressing the spring 7. When the rotating boss 801 moves from the guide limit groove 206 to the top of the guide ramp 202, the rotating sleeve 8 can be driven to rotate under the guidance of the limit ramp 207 and the compression of the spring 7, so that the rotating boss 801 on the outer wall of the rotating sleeve 8 falls on the limit ramp 207 for vertical limitation. At the same time, the telescopic limit block 301 on the outer wall of the telescopic protective sleeve 3 slides inside the guide groove 205 and continues to move downward, thereby realizing the contraction and storage of the pointer 4;

[0060] ② When the telescopic protective cover 3 is pressed again, the top tooth 302 at the end can be further cooperated with the rotating boss 801 on the rotating sleeve 8 to push the pointer 4 and the rotating sleeve 8 to move upward together, compressing the spring 7. When the rotating boss 801 moves from the guide groove 205 to the top of the guide ramp 202, the rotating sleeve 8 can be driven to rotate under the guidance of the guide ramp 202 and the compression of the spring 7, so that the rotating boss 801 on the outer wall of the rotating sleeve 8 falls into the guide limit groove 206, and the telescopic limit block 301 and the rotating boss 801 on the outer wall of the telescopic protective cover 3 slide inside the guide groove 205 and continue to move downward, thereby realizing the extension of the pointer 4.

[0061] By adopting the above technical solution, the rotating boss 801 on the rotating sleeve 8 cooperates with the guide ramp 202 and the limit ramp 207 on the inner wall of the handheld buckle shell 2, and combined with the pre-pressure of the spring 7, a "press-rotate-limit" linkage mechanism is formed. When the telescopic protective sleeve 3 is pressed, the rotating boss 801 slides and rotates along the guide ramp 202, and accurately falls into the guide limit groove 206 or the limit ramp 207 to achieve positioning, solving the problem of accidental telescopic extension and retraction caused by insufficient friction in the traditional sleeve-type telescopic structure, ensuring the stability of the length of the needle 4 during the measurement process, and the telescopic protective sleeve 3 retracts and retracts synchronously with the needle 4. When stored, it completely wraps the tip of the needle 4 to avoid collision damage when carried or idle; when extended, only the measuring contacts are exposed, and the side walls of the protective sleeve can block dust and liquid intrusion. The connection part between the test needle 4 and the connecting wire 5 solves the problem that the traditional test pen protective cover is easy to lose or the protection is not complete. The rotating top inclined platform 802 adopts a 25°-35° inclination design, which cooperates with the tooth plane of the end top tooth 302 to reduce the rotation resistance and make the pressing-extension action respond quickly; the gripping anti-slip texture 101 on the outer wall of the hand-held buckled shell 2 increases the friction coefficient, and can still be held stably in oily or humid environments. It is suitable for various scenarios such as industrial sites and laboratories, and is especially convenient for one-handed operation in narrow spaces.

[0062] Hand-held buckle shell 2 and watch pen outer shell 1 are separated, inner ring sleeve 6 is pulled out, rotating sleeve 8 is removed, new watch needle 4 is replaced, connection line 5 is re-welded, and the assembly steps are reset, so that the whole process does not need special tools, spring 7 is replaced: if the spring 7 is attenuated, the telescopic protective sleeve body 3 can be disassembled, the old spring 7 is taken out, the same specification new spring 7 is replaced, the pre-pressing amount is ensured to meet the design value, the assembly is maintained and replaced, the multimeter pen is superior to the prior art in structural stability, operation fluency and environmental adaptability, and can be widely applied to electronic maintenance, industrial detection, laboratory testing and the like.

[0063] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can replace or change the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A multimeter probe with a telescopic structure, comprising a probe outer shell (1), a hand-held snap-on shell (2), a telescopic protective sleeve (3) and a probe (4), characterized in that: An inner ring (6) is provided inside the test lead outer shell (1) and the handheld buckle shell (2), and the inner ring (6) and the test lead outer shell (1) are connected by a snap-fit ​​method. The telescopic protective sleeve (3) is movably provided inside the handheld buckle shell (2), and the test needle (4) is movably provided in the inner ring (6) and the inner hole of the telescopic protective sleeve (3). A rotating sleeve (8) is fixedly connected to the outer wall of the test needle (4); The rotating sleeve (8) has a plurality of vertical rotating bosses (801) integrally formed on the side wall along the circumferential direction, a rotating top-matching inclined platform (802) is integrally formed on the top of the rotating boss (801), and the rotating top-matching inclined platform (802) is a herringbone structure. The end of the telescopic protective sleeve (3) is provided with an end top tooth (302) that cooperates with the rotating top-matching inclined platform (802), and a telescopic limiting block (301) is integrally formed on the side wall of the rotating sleeve (8). The inner wall of the handheld buckling shell (2) has a plurality of vertical protrusions (201) with equal intervals along the circumferential direction, and guide limiting grooves (206) are integrally formed between the vertical protrusions (201). A guide groove (205) is provided on the inner wall of the vertical protrusion (201). The guide groove (205) and the guide limit groove (206) are both slidably connected to the telescopic limit block (301); the guide limit groove (206) is slidably connected to the rotating boss (801); the top of the vertical protrusion (201) is located on one side of the guide groove (205) and is integrally formed with a guide ramp (202); the guide ramp (202) cooperates with the rotating top matching ramp (802); the end of the vertical protrusion (201) is located on the other side of the guide groove (205) and is integrally formed with a limit ramp (207) that cooperates with the rotating top matching ramp (802); the outer periphery of the rotating clamping sleeve (8) on the outer wall of the pointer (4) is located between the rotating boss (801) and the inner wall clamping sleeve of the inner ring (6) and is clamped with a spring (7).

2. The multimeter probe with a telescopic structure according to claim 1, characterized in that: A snap-fit ​​platform (601) is integrally formed on the outer wall of the inner ring (6), a snap-fit ​​cylindrical groove (602) is provided on the snap-fit ​​platform (601), a snap-fit ​​cylindrical groove (203) is provided on the inner wall of the handheld snap-fit ​​shell (2) and is plugged into the snap-fit ​​platform (601), and a snap-fit ​​cylindrical protrusion (204) is integrally formed on the snap-fit ​​cylindrical groove (203) and is press-fitted into the snap-fit ​​cylindrical groove (602).

3. The multimeter probe with a telescopic structure according to claim 2, characterized in that: The side wall of the outer shell of the needle (4) is provided with a gripping anti-slip pattern (101), and a connecting wire (5) is fixedly connected to the inside of the outer shell of the test lead (1). The other end of the connecting wire (5) passes through the inner ring (6) and is electrically connected to the needle (4), and the other end of the connecting wire (5) is connected to an external detection device.

4. The multimeter probe with a telescopic structure according to claim 1, characterized in that: A snap ring (303) is integrally formed on the top of the inner wall of the telescopic protective sleeve (3), and an annular movable groove (803) for providing a limit for the snap ring (303) is provided on the bottom of the outer wall of the rotating sleeve (8).

5. The multimeter probe with a telescopic structure according to claim 1, characterized in that: The inclination angle of the rotating top matching inclined platform (802) is 25°-35°, and the tooth shape of the end top tooth (302) is a plane structure.

6. The multimeter probe with a telescopic structure according to claim 2, characterized in that: The diameter of the buckling cylindrical protrusion (204) is 2.5-3.5 mm, and the height is 1.2-1.8 mm. The depth of the buckling cylindrical groove (602) is 1.1-1.3 times the height of the buckling cylindrical protrusion (204).

7. The multimeter probe with a telescopic structure according to claim 1, characterized in that: The preload of the spring (7) is 1 / 4-1 / 3 of the free length, and the stiffness of the spring (7) is 0.5-1.5 N / mm.

8. A method for using a multimeter probe with a telescopic structure, applied to the multimeter probe with a telescopic structure as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Assembly steps: ① Insert the inner ring (6) into the handheld snap-fit ​​housing (2), so that the snap-fit ​​platform (601) is snapped into the snap-fit ​​groove (203), and the snap-fit ​​cylindrical protrusion (204) is embedded in the snap-fit ​​cylindrical groove (602); ② Insert the spring (7) into the telescopic protective cover (3), and then insert the telescopic protective cover (3) into the test lead outer shell (1), so that the telescopic limit block (301) is inserted into the limit slide groove; ③ Install the rotating sleeve (8) so that the rotating boss (801) and the end top tooth (302) are initially engaged; ④ Connect the watch needle (4) to the connecting line (5), insert the watch needle (4) into the telescopic protective sleeve (3), and position it through the annular groove (401); ⑤ Snap the handheld snap-fit ​​housing (2) into engagement with the test lead housing (1); 2) Telescopic adjustment steps: ① By pressing the telescopic protective sleeve (3), the top teeth (302) at the end can cooperate with the rotating boss (801) on the rotating sleeve (8), so as to push the pointer (4) and the rotating sleeve (8) to move upward together, compressing the spring (7). When the rotating boss (801) moves from the guide limiting groove (206) to the top of the guide ramp (202), the rotating sleeve (8) can be driven to rotate under the guidance of the limiting ramp (207) and the compression of the spring (7), so that the rotating boss (801) on the outer wall of the rotating sleeve (8) falls onto the limiting ramp (207) for vertical limiting. At the same time, the telescopic limiting block (301) on the outer wall of the telescopic protective sleeve (3) slides inside the guide groove (205) and continues to move downward, thereby realizing the contraction and storage of the pointer (4); ② When the telescopic protective sleeve (3) is pressed again, the end top teeth (302) can be further matched with the rotating boss (801) on the rotating sleeve (8) to push the pointer (4) and the rotating sleeve (8) to move upward together, compressing the spring (7). When the rotating boss (801) moves from the guide groove (205) to the top of the guide ramp (202), the rotating sleeve (8) can be driven to rotate under the guidance of the guide ramp (202) and the compression of the spring (7), so that the rotating boss (801) on the outer wall of the rotating sleeve (8) falls into the guide limit groove (206), and the telescopic limit block (301) and the rotating boss (801) on the outer wall of the telescopic protective sleeve (3) slide inside the guide groove (205) and continue to move downward, thereby realizing the extension of the pointer (4).

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