CN214895492U - Whole board micro-current test fixture - Google Patents

Abstract

The utility model provides a whole-plate micro-current test fixture, which relates to the technical field of current test and comprises a box body, an upper die mechanism, a lower die mechanism and a circuit switching mechanism, wherein the upper die mechanism, the lower die mechanism and the circuit switching mechanism are all arranged on the box body; the upper die mechanism comprises a needle template and a lifting driving assembly in transmission connection with the needle template, and a plurality of test needles are arranged on the needle template; the lower die mechanism comprises a lower die plate for placing a product to be tested; the lifting driving component is used for driving the needle template to be close to or far away from the lower template; the circuit switching mechanism comprises a plurality of groups of on-off switching assemblies, each on-off switching assembly comprises a probe capable of being switched on and off and an interface needle, the on-off switching assemblies are arranged corresponding to the test needles, the interface needles can collect currents of the test needles corresponding to the interface needles, and the technical problems that in the prior art, the manual use of an ohmi meter for testing the currents leads to high working strength of operators and the test time is consumed are solved.

Description

Whole board micro-current test fixture

Technical Field

The utility model belongs to the technical field of the current test technique and specifically relates to a little current test fixture of whole board is related to.

Background

The whole electronic product test strip plate needs to use a jig to test the micro current value of a product after discharging, the whole plate current test jig has universality, and only upper and lower die plates need to be adjusted when different products are produced.

The existing testing mode is that the ohmi meter is respectively butted with the gold surface of each product on the whole plate by hand, the working strength of operators is increased by the testing mode, and the testing time is consumed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a little current test fixture of whole board to alleviate the manual use ohm's table test current that exists among the prior art, lead to operating personnel's working strength great, and consume test time's technical problem.

In a first aspect, the utility model provides a little current test fixture of whole board, include: the device comprises a box body, an upper die mechanism, a lower die mechanism and a circuit switching mechanism, wherein the upper die mechanism, the lower die mechanism and the circuit switching mechanism are all arranged on the box body;

the upper die mechanism comprises a needle template and a lifting driving assembly in transmission connection with the needle template, and a plurality of test needles are arranged on the needle template;

the lower die mechanism comprises a lower die plate for placing a product to be tested; the lifting driving assembly is used for driving the needle template to be close to or far away from the lower template;

the circuit switching mechanism comprises a plurality of groups of on-off switching assemblies, each on-off switching assembly comprises a probe capable of being switched on and off and an interface needle, and the on-off switching assemblies are arranged corresponding to the test needles and can enable the interface needles to collect currents of the test needles corresponding to the interface needles.

Further, a bedplate is arranged in the box body;

the upper die mechanism further comprises a middle plate, an upper die stand column and an upper pressing plate, and the upper die stand column is fixedly connected between the middle plate and the platen; the upper pressing plate is slidably sleeved on the upper die stand column;

the needle template is arranged on the upper pressure plate;

the lifting driving component is in transmission connection with the upper pressure plate.

Further, the lifting driving assembly comprises a cylinder, a fixing plate and a first connecting column;

the air cylinder is arranged on the middle plate, a piston rod of the air cylinder is fixedly connected with the fixing plate, and the first connecting column is fixedly connected between the fixing plate and the upper pressing plate;

the fixed plate is positioned below the upper pressure plate.

Further, the upper die mechanism also comprises a jig upper die and an upper die plate which are fixedly connected up and down;

the upper pressing plate is provided with a guide groove at one side close to the needle template, and the upper jig mould can slide into or out of the guide groove from one side;

the needle template is fixedly connected to the upper template.

Furthermore, a guide block is arranged on one side of the upper pressure plate, which is close to the needle template;

the two guide blocks are arranged oppositely; the distance between the two guide blocks is adjustable;

the guide grooves are formed by the two guide blocks and the upper pressure plate in a surrounding mode.

Furthermore, the upper pressure plate is connected with the upper template through a second connecting column, so that a gap is reserved between the upper pressure plate and the upper template.

Further, the box body is provided with an opening;

the lower template is movably arranged on the bedplate, so that the lower template can slide into or out of the box body from the opening.

Furthermore, the lower die mechanism also comprises a support plate, a lower die bottom plate and a lower die upright post fixedly connected between the support plate and the lower die bottom plate; a drawer front plate is arranged at one end of the support plate and one end of the lower die bottom plate close to the opening;

the support plate is connected to the bedplate in a sliding manner;

the lower template is fixedly connected to the lower die base plate.

Furthermore, the whole-plate micro-current test fixture also comprises a control unit;

the upper die mechanism, the lower die mechanism and the circuit switching mechanism are all electrically connected with the control unit;

a starting button is arranged on a front door plate of the box body;

the bedplate is provided with an optical fiber for detecting whether the lower template moves in place;

the start button and the optical fiber are both electrically connected with the control unit.

Furthermore, the circuit switching mechanism also comprises a switching bottom plate, a switching top plate and a switching upright post fixedly connected between the switching bottom plate and the switching top plate;

the switching on-off switching assembly further comprises a sliding table cylinder, and the sliding table cylinder is positioned between the switching bottom plate and the switching top plate;

the interface needle is arranged on one side of the switching top plate, which is far away from the switching bottom plate;

the probe is fixedly connected with a piston rod of the sliding table cylinder through a cylinder lower connecting plate, and the sliding table cylinder is used for driving the probe to be close to or far away from the interface needle.

Has the advantages that:

the utility model provides a little current test fixture of whole board, upper die mechanism include needle template and with the needle template transmission be connected lift drive assembly, be equipped with a plurality of test needles on the needle template, lower die mechanism includes the lower bolster that is used for placing the product that awaits measuring, when testing, can place the product that awaits measuring on the lower bolster, drive the motion of needle template through lift drive assembly to be close to or keep away from the lower bolster; specifically, the needle template can move close to the lower template, and a plurality of test needles on the needle template are in contact with a plurality of points to be tested on a product to be tested; at the moment, the circuit switching mechanism comprises a plurality of groups of on-off switching assemblies, each on-off switching assembly comprises a probe capable of being switched on and off and an interface needle, and the on-off switching assemblies and the testing needles are arranged correspondingly, so that the interface needles can collect currents of the testing needles corresponding to the interface needles, and current collection of a plurality of testing points is realized in one-time testing.

Therefore, the whole-plate micro-current testing jig can replace manual testing, the working strength of operators is reduced, meanwhile, the testing time is shortened, and the testing efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a whole-board micro-current testing fixture according to an embodiment of the present invention;

fig. 2 is a partially disassembled schematic view of the whole-board micro-current testing fixture provided in the embodiment of the present invention, wherein the upper die mechanism and the lower die mechanism are not shown;

FIG. 3 is a partially disassembled schematic view of the upper and lower die mechanisms;

fig. 4 is a schematic structural diagram of the line switching mechanism.

Icon:

10-a product to be tested;

100-a box body; 110-a platen; 120-an upper shell; 130-a lower shell; 140-front door panel; 121-opening;

200-an upper die mechanism; 210-pin template; 220-middle plate; 230-upper mold column; 240-upper press plate; 250-a lift drive assembly; 260-a jig upper die; 270-upper template; 280-a guide block; 290-a second connecting column; 251-a cylinder; 252-a fixed plate; 253-first connecting post;

300-a lower die mechanism; 310-a lower template; 320-a carrier plate; 330-lower die bottom plate; 340-lower die column; 350-drawer front panel; 360-guide rail; 351-handle;

400-a line switching mechanism; 410-a probe; 420-interface needle; 430-a patch panel; 440-adapting the top plate; 450-a transition column; 460-a slipway cylinder; 470-needle film upper plate; 480-needle membrane top block; 490-a patch needle membrane;

500-start button;

600-optical fiber.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 to 3, the present embodiment provides a whole-board micro-current testing fixture, which includes a box 100, an upper die mechanism 200, a lower die mechanism 300 and a circuit switching mechanism 400, all of which are mounted on the box 100; the upper mold mechanism 200 comprises a needle template 210 and a lifting driving assembly 250 in transmission connection with the needle template 210, wherein a plurality of test needles (not shown in the drawing) are arranged on the needle template 210; the lower die mechanism 300 comprises a lower die plate 310 for placing the product 10 to be tested; the lifting driving assembly 250 is used for driving the needle template 210 to be close to or far away from the lower template 310; the circuit switching mechanism 400 includes a plurality of sets of on-off switching components, each set of on-off switching components includes a probe 410 and an interface needle 420, and each set of on-off switching components corresponds to a corresponding test needle, so that the interface needle 420 can collect a current of the corresponding test needle.

In the whole-board micro-current testing fixture provided by the embodiment, the upper die mechanism 200 comprises a pin template 210 and a lifting driving assembly 250 in transmission connection with the pin template 210, a plurality of testing pins are arranged on the pin template 210, the lower die mechanism 300 comprises a lower template 310 for placing a product 10 to be tested, when in testing, the product 10 to be tested can be placed on the lower template 310, and the lifting driving assembly 250 drives the pin template 210 to move so as to be close to or far away from the lower template 310; specifically, the pin template 210 can be moved close to the lower template 310, and a plurality of test pins on the pin template 210 are in contact with a plurality of points to be tested on the product 10 to be tested; at this time, since the circuit switching mechanism 400 includes a plurality of sets of on-off switching components, each set of on-off switching components includes the probe 410 and the interface pin 420, which can be switched on and off, and the on-off switching components are arranged corresponding to the test pins, so that the interface pin 420 can collect the current of the corresponding test pin, thereby simultaneously realizing the current collection of a plurality of test points in one test.

Specifically, during testing, after the plurality of test pins on the pin template 210 contact the plurality of points to be tested on the product 10 to be tested, the probes 410 and the interface pins 420 in one set of on-off switching assembly are kept connected each time, and the others are all disconnected, so that the current value of one test point can be tested, and so on until the current values of the plurality of test points are tested.

Therefore, the whole-board micro-current testing jig can replace manual testing, the working strength of operators is reduced, meanwhile, the testing time is shortened, and the testing efficiency is improved.

It should be noted that the number of the test pins on the pin template 210 is set according to the test points of the product 10 to be tested, and the positions of the test pins correspond to the positions of the test points of the product 10 to be tested one by one.

In this embodiment, referring to fig. 2 and 3, a platen 110 is provided in the box 100; the upper die mechanism 200 further comprises a middle plate 220, an upper die column 230 and an upper pressing plate 240, wherein the upper die column 230 is fixedly connected between the middle plate 220 and the platen 110; the upper pressing plate 240 is slidably sleeved on the upper mold pillar 230; the needle template 210 is mounted on the upper platen 240; the lifting driving assembly 250 is in transmission connection with the upper pressing plate 240.

During specific work, the lifting driving assembly 250 drives the upper pressing plate 240 to move, so that the upper pressing plate 240 slides along the upper die upright 230, and the needle template 210 moves due to the fact that the needle template 210 is installed on the upper pressing plate 240.

Referring to fig. 2, the cabinet 100 further includes an upper housing 120 and a lower housing 130, and the platen 110 is fixedly coupled between the upper housing 120 and the lower housing 130, and the platen 110 divides a space inside the cabinet 100 into an upper space and a lower space. Among them, the upper and lower die mechanisms 200 and 300 are installed in the upper space, and the line switching mechanism 400 is installed in the lower space.

Further, referring to fig. 3, the elevating driving assembly 250 includes a cylinder 251, a fixing plate 252, and a first connection post 253; the cylinder 251 is installed on the middle plate 220, a piston rod of the cylinder 251 is fixedly connected with the fixing plate 252, and the first connecting column 253 is fixedly connected between the fixing plate 252 and the upper pressing plate 240; the fixing plate 252 is located below the upper platen 240, and thus the overall layout of the upper die mechanism 200 can be made compact while the upper platen 240 is lifted.

Referring to fig. 3, the upper mold mechanism 200 further includes a fixture upper mold 260 and an upper mold plate 270 which are fixedly connected up and down; a guide groove is formed in one side of the upper pressing plate 240 close to the needle template 210, and the upper jig mold 260 can slide into or out of the guide groove from one side; the pin template 210 is fixedly connected to the upper template 270, and thus, the pin template 210 can be conveniently disassembled and assembled, so that the pin template can be adapted to different product types.

Exemplarily, when the needle template 210 needs to be replaced, the jig upper mold 260 can be pulled, the jig upper mold 260 slides out from one side of the guide groove, at this time, the needle template 210 can be detached from the upper mold 270 for replacement, and after the replacement is completed, the jig upper mold 260 is pushed into the guide groove.

From this, when testing different products, need not to carry out the dismouting to lower die mechanism 300 etc. and whole change process is more convenient, and is simple quick.

In one embodiment of the present application, a guide 280 is provided on a side of the upper platen 240 adjacent to the needle template 210; the guide blocks 280 are arranged in two and are oppositely arranged; wherein the distance between the two guide blocks 280 is adjustable; the two guide blocks 280 and the upper press plate 240 define a guide groove.

In other embodiments, a guide groove may be directly formed on one side of the upper pressing plate 240 close to the needle template 210. That is, the upper platen 240 and the guide block 280 shown in fig. 3 are integrally provided.

Referring to fig. 3, the upper press plate 240 is connected to the upper press plate 270 through a second connecting column 290, so that a gap is left between the upper press plate and the upper press plate 270, so as to facilitate the installation of the guide block 280, and a certain gap is left at the same time, so that a human hand can push and pull the jig upper mold 260.

In this embodiment, the case 100 has an opening 121; the lower plate 310 is movably disposed on the platen 110 so that the lower plate 310 can slide into or out of the box 100 through the opening 121 to facilitate placement or removal of the product 10 to be tested.

In one embodiment of the present application, referring to fig. 2 and 3, the lower die mechanism 300 further includes a carrier plate 320, a lower die base plate 330, and a lower die column 340 fixedly connected therebetween; a drawer front plate 350 is arranged at one end of the carrier plate 320 and the lower die bottom plate 330 close to the opening 121; the carrier plate 320 is slidably connected to the platen 110; the lower plate 310 is fixedly attached to the lower mold base plate 330.

Wherein, a handle 351 is arranged on the drawer front plate 350.

Specifically, the bottom of the carrier plate 320 is provided with a guide rail 360, and the platen 110 is provided with a slider slidably engaged with the guide rail 360.

In this embodiment, the whole board micro-current test fixture further comprises a control unit; the upper die mechanism 200, the lower die mechanism 300 and the line switching mechanism 400 are electrically connected with the control unit; a start button 500 is arranged on the front door panel 140 of the box body 100; the platen 110 is provided with an optical fiber 600 for detecting whether the lower template 310 moves in place; the start button 500 and the optical fiber 600 are both electrically connected to the control unit.

It should be noted that the upper die mechanism 200, the lower die mechanism 300 and the line switching mechanism 400 may cooperate under the control of the control unit, which is possible for those skilled in the art to realize.

In specific use, when the start button 500 is pressed, the upper die mechanism 200 and the circuit switching mechanism 400 work in cooperation to test the product 10 to be tested.

If the optical fiber 600 detects that the lower template 310 is not moved in place, the whole micro-current testing jig does not start testing even if the start button 500 is pressed, so that the product 10 to be tested is protected to a certain extent, and the condition that the product 10 to be tested is possibly damaged because the pin template 210 is not aligned with the product 10 to be tested is prevented.

The key of the technology for detecting whether the lower template 310 is moved in place by the optical fiber 600 is to detect the position of the lower template 310, which is well known to those skilled in the art and will not be described herein again.

Referring to fig. 4, the circuit switching mechanism 400 further includes an adaptor bottom plate 430, an adaptor top plate 440, and an adaptor stud 450 fixedly connected therebetween; the on-off switching assembly further comprises a sliding table cylinder 460, and the sliding table cylinder 460 is positioned between the transfer bottom plate 430 and the transfer top plate 440; the interface pin 420 is installed on one side of the switching top plate 440, which faces away from the switching bottom plate 430; probe 410 is connected fixedly with the piston rod of slip table cylinder 460 through the cylinder lower connecting plate, and slip table cylinder 460 is used for driving probe 410 to be close to or keep away from interface needle 420.

In this embodiment, the plurality of sets of circuit switching mechanisms 400 may be arranged side by side.

Specifically, the circuit switching mechanism 400 is set to five groups, and each test point corresponds to one group of the circuit switching mechanism 400.

When the current value of one of the test points needs to be obtained, the probe 410 of the corresponding line switching mechanism 400 can be communicated with the interface needle 420, the probe 410 of the other four groups of line switching mechanisms 400 are disconnected from the interface needle 420, and so on, and finally the current values of the five test points are obtained.

The probe 410 and the interface needle 420 of the line switching mechanism 400 are normally in an off state.

In this embodiment, the piston rod of the sliding table cylinder 460 extends out to disconnect the probe 410 from the interface needle 420, and conversely, the probe 410 can communicate with the interface needle 420.

With continued reference to fig. 4, the slide cylinder 460 may be mounted on a side of the transfer top plate 440 facing the transfer bottom plate 430. The needle membrane upper plate 470 and the needle membrane top block 480 are fixedly connected to two sides of the cylinder lower connecting plate, and the probe 410 is fixed on the needle membrane top block 480 and sequentially penetrates through the cylinder lower connecting plate and the needle membrane upper plate 470; the interfacial pins 420 are fixed to the transfer pin membrane 490.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. The utility model provides a little current test fixture of whole board which characterized in that includes: the device comprises a box body (100), an upper die mechanism (200), a lower die mechanism (300) and a circuit switching mechanism (400), wherein the upper die mechanism, the lower die mechanism and the circuit switching mechanism are all arranged on the box body (100);

the upper die mechanism (200) comprises a needle template (210) and a lifting driving assembly (250) in transmission connection with the needle template (210), and a plurality of test needles are arranged on the needle template (210);

the lower die mechanism (300) comprises a lower die plate (310) for placing a product (10) to be tested; the lifting driving assembly (250) is used for driving the needle template (210) to be close to or far away from the lower template (310);

the circuit switching mechanism (400) comprises a plurality of groups of on-off switching assemblies, each on-off switching assembly comprises a probe (410) and an interface needle (420), the probes can be switched on and off, the on-off switching assemblies are arranged corresponding to the test needles, and the interface needles (420) can collect currents of the test needles corresponding to the interface needles.

2. The whole-plate micro-current test fixture according to claim 1, wherein a platen (110) is arranged in the box body (100);

the upper die mechanism (200) further comprises a middle plate (220), an upper die upright post (230) and an upper pressing plate (240), wherein the upper die upright post (230) is fixedly connected between the middle plate (220) and the platen (110); the upper pressing plate (240) is sleeved on the upper die upright post (230) in a sliding manner;

the needle template (210) is mounted to the upper platen (240);

the lifting driving component (250) is in transmission connection with the upper pressure plate (240).

3. The whole-board micro-current testing fixture of claim 2, wherein the lifting driving assembly (250) comprises a cylinder (251), a fixing plate (252) and a first connecting column (253);

the air cylinder (251) is mounted on the middle plate (220), a piston rod of the air cylinder (251) is fixedly connected with the fixing plate (252), and the first connecting column (253) is fixedly connected between the fixing plate (252) and the upper pressure plate (240);

the fixing plate (252) is located below the upper pressure plate (240).

4. The whole-board micro-current test fixture according to claim 2, wherein the upper die mechanism (200) further comprises a fixture upper die (260) and an upper die plate (270) which are fixedly connected up and down;

a guide groove is formed in one side, close to the needle template (210), of the upper pressing plate (240), and the upper jig die (260) can slide into or out of the guide groove from one side;

the pin template (210) is fixedly connected to the upper template (270).

5. The whole-plate micro-current test fixture according to claim 4, wherein a guide block (280) is arranged on one side of the upper pressure plate (240) close to the pin template (210);

the two guide blocks (280) are arranged oppositely; wherein the distance between the two guide blocks (280) is adjustable;

the guide grooves are formed by the two guide blocks (280) and the upper pressure plate (240).

6. The fixture according to claim 4, wherein the upper plate (240) is connected to the upper plate (270) via a second connecting column (290) so as to leave a gap therebetween.

7. The whole-board micro-current test fixture according to claim 2, wherein the box (100) has an opening (121);

the lower template (310) is movably arranged on the bedplate (110) so that the lower template (310) can slide into or out of the box body (100) from the opening (121).

8. The whole-plate micro-current test fixture according to claim 7, wherein the lower mold mechanism (300) further comprises a carrier plate (320), a lower mold base plate (330) and a lower mold pillar (340) fixedly connected therebetween; a drawer front plate (350) is arranged at one end, close to the opening (121), of the carrier plate (320) and one end, close to the opening (121), of the lower die bottom plate (330);

the carrier plate (320) is connected with the bedplate (110) in a sliding way;

the lower template (310) is fixedly connected to the lower die base plate (330).

9. The whole-board micro-current test fixture according to claim 7, further comprising a control unit;

the upper die mechanism (200), the lower die mechanism (300) and the line switching mechanism (400) are all electrically connected with the control unit;

a starting button (500) is arranged on a front door panel (140) of the box body (100);

the platen (110) is provided with an optical fiber (600) for detecting whether the lower template (310) moves in place or not;

the start button (500) and the optical fiber (600) are both electrically connected to the control unit.

10. The fixture according to any one of claims 1-9, wherein the circuit switching mechanism (400) further comprises an adapter bottom plate (430), an adapter top plate (440), and an adapter pillar (450) fixedly connected therebetween;

the on-off switching assembly further comprises a sliding table cylinder (460), and the sliding table cylinder (460) is located between the switching bottom plate (430) and the switching top plate (440);

the interface pin (420) is mounted on the side, facing away from the adapter bottom plate (430), of the adapter top plate (440);

the probe (410) is fixedly connected with a piston rod of the sliding table cylinder (460) through a cylinder lower connecting plate, and the sliding table cylinder (460) is used for driving the probe (410) to be close to or far away from the interface needle (420).

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