Device for qualifying a plurality of specimens comprising a wire and at least one crimped element, and corresponding method

Abstract

A device for qualifying a plurality of specimens comprising a wire and at least one crimped element, and a corresponding method. A device for qualifying a plurality of specimens (14), each comprising a wire (18) and at least one element (20) crimped onto the wire, the device comprising: - a test area (28) forming locations (24) respectively intended to receive the specimens to be tested, - a programmable current source (30), - an electrical circuit (32) for electrically connecting the locations to the current source, the electrical circuit comprising contactors (C1 to C21) adapted to be open or closed and to define, in combination with each other, a plurality of electrical circuit configurations, in particular of a first type, in which: - only one of the locations is selectively electrically connected to the current source, - the others are disconnected from the current source.and - only one of the specimens is intended to be subjected to a current. Figure for the abbreviation: Figure 2,

Description

Title of the invention: Device for qualifying a plurality of specimens comprising a wire and at least one crimped element, and corresponding method Scope of the invention

[0001] The present invention relates to a device for qualifying a plurality of specimens, each of the specimens comprising a wire and at least one element crimped onto the wire.

[0002] The invention also relates to a test method implementing such a device. Prior art

[0003] In this context, a specimen corresponds to a type of wire associated on the one hand with a type of element crimped onto a wire, such as a lug, a ferrule, a coaxial or triaxial contact, and on the other hand with a crimping tool, such as pliers with given jaws.

[0004] The qualification of crimp fittings is of particular importance in industry. In the field of pressurized water nuclear reactors, for example, it is governed by the 2019 RCC-E standard (Rules for the Design and Construction of Electrical Equipment for Nuclear Islands). The 2019 RCC-E refers to the following sequence of electrical tests and is carried out in accordance with the requirements of § 5.3.2.3.2 of IEC 60352-2: • Contact resistance, • Cyclic current charging, • Contact resistance

[0005] This standard specifies two electrical resistance measurements per specimen, one between the crimped element and the wire, and the other between two points on the wire, in particular to evaluate the contact resistance between the crimped element and the wire. If the specimen is double, that is, if it has two elements crimped respectively to the two ends of the wire, the number of resistance measurements is therefore four.

[0006] The standard further requires that, for each specimen, resistance measurements be taken first, then a higher load current be passed through the specimen, and finally resistance measurements be taken a second time. Moreover, the implementation of the 2019 RCC-E standard requires precision and repeatability of the tests.

[0007] In the nuclear field, the number of possible specimens can be in the hundreds. Qualification tests for crimp specimens are therefore complex and time-consuming. To date, there is no satisfactory solution for carrying them out. a simpler and faster way.

[0008] One object of the invention is therefore to facilitate the qualification of crimping specimens. Summary of the invention

[0009] To this end, the invention relates to a device for qualifying a plurality of specimens, each specimen comprising a wire and at least one element crimped onto the wire, the device comprising:

[0010] - a test area forming a plurality of locations respectively intended for receive the specimens to be tested,

[0011] - a programmable current source, and

[0012] - an electrical circuit adapted to electrically connect the locations to the source of current, the electrical circuit comprising a plurality of contactors adapted to be open or closed and to define, in combination with each other, a plurality of electrical circuit configurations, the plurality of configurations comprising configurations of a first type, in which:

[0013] - only one of the locations is selectively electrically connected to the source of fluent,

[0014] - the other locations are disconnected from the power source, and

[0015] - only one of the specimens is intended to be traversed by a current.

[0016] According to other advantageous aspects of the invention, the device comprises one or more of the following features, taken individually or in all technically possible combinations:

[0017] - the plurality of configurations of the electrical circuit includes at least one configuration figure of a second type, in which: all locations are connected in series to the current source, and all specimens are intended to be traversed in series by a current;

[0018] - the device includes a control panel comprising a plurality of switches adapted to control the contactors respectively and to switch the electrical circuit from any one configuration of said plurality of configurations to any other configuration;

[0019] - the current source is mobile between a first power supply configuration, in which the current source is intended to deliver a current in a first direction in the electrical circuit, and a second power supply configuration, in which the current source is intended to deliver a current in a second direction opposite to the first direction, the control panel including a switch suitable for selectively switching the power source from one to the other of the first power supply configuration and the second configuration;

[0020] - the control panel includes a visual representation of the electrical circuit, and a plurality of female plugs respectively connected to electrical contacts of the locations, the electrical contacts being intended to be in contact with the specimens;

[0021] - each of the locations comprises: two extreme electrical contacts ap part of the electrical circuit and intended to be in contact with two ends of one of the specimens; and one or more intermediate electrical contacts intended to be in contact with intermediate portions of one of the specimens;

[0022] - each of the outermost electrical contacts and the innermost electrical contact(s) medians include at least two tinned copper bars intended to be positioned on either side of one of the specimens in a tightening direction, and a system for bringing the two bars closer together in the tightening direction;

[0023] - each of the locations includes one or more suitable fastening elements to immobilize the thread of one of the specimens relative to the test area;

[0024] - the electrical circuit comprises a first main branch and a second main branch electrically connected to two terminals of the current source respectively, the locations being connected, in parallel with each other, to the first main branch and the second main branch, the plurality of contactors comprising a first group of contactors located respectively between the locations and the second main branch;

[0025] - the plurality of contactors includes a second group of contactors located in the first main branch and in the second main branch, the contactors of the second group being adapted, when all open and the contactors of the first group all closed, to define an "S" shaped path through all locations and alternately the first main branch and the second main branch, this path being intended to carry in series a current, from one of the two terminals of the current source, through all specimens, from a first specimen to a last specimen, the electrical circuit including a return branch intended to electrically connect the last specimen to the other of the two terminals of the current source; and

[0026] - the device comprises a chassis, preferably equipped with wheels, on which the area for testing, the power source and the control panel are fixed, for example in the form of compartments preferably stacked in a vertical direction, the device being adapted to form a mobile test bench.

[0027] The invention also relates to an assembly comprising a device as described above and one or more measuring devices, in particular voltmeters, connected or connectable to the device.

[0028] The invention also relates to a qualification method implementing a device or assembly as described above, method for qualifying a plurality of specimens, each specimen comprising a wire and at least one element crimped onto the wire, the method comprising the following steps:

[0029] - obtaining a device,

[0030] - placement of the specimens to be tested in the plurality of locations,

[0031] - putting the electrical circuit in each of the configurations of the first type for electrically connect only one of the locations to the power source, the other locations being disconnected from the power source, with only one of the specimens carrying a current.

[0032] - carrying out measurements based on the specimens,

[0033] - the specimens remaining in the locations during the measurements. Figures

[0034] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the accompanying drawings, in which:

[0035] [Fig-1] [Fig.1] is a schematic, perspective view of an assembly according to the invention,

[0036] [Fig.2] [Fig.2] is a top view of a test area of ​​the assembly shown in [Fig.1], schematically showing part of an electrical circuit of the assembly,

[0037] [Fig.3] [Fig.3] is a top and side view of one of the locations in the test area shown in Figures 1 and 2, one of the specimens to be tested being received in the location,

[0038] [Fig.4] [Fig.4] is a schematic view of one of the contacts in the location shown in [Fig.3], and

[0039] [Fig. 5] [Fig. 5] is a schematic view of a control panel of the assembly shown in [Fig. 1], the panel including a planar representation of the electrical circuit partially shown in [Fig. 2]. [Fig. 5] represents, for example, the HMI (human-machine interface) strip of the test means. Description of an assembly according to the invention

[0040] With reference to figures 1 and 2, an assembly 10 according to the invention is described.

[0041] The assembly 10 includes a device 12 ([Fig.1]) for qualifying a plurality of specimens 14 (visible in Figures 2 and 3), and one or more measuring devices 16 (Figures 1, 2 and 5) external to the device, in the example of portable voltmeters.

[0042] In an alternative (not shown), the measuring devices 16 are integrated into the device 12, and are then internal to the device.

[0043] By “qualification device” is meant a device which facilitates this qualification, but which does not necessarily include all the elements involved in this qualification, such as measuring devices 14. Specimens to be tested

[0044] The specimens 14 (Figures 2 and 3) comprise a wire 18 and at least one element 20, such as a lug, ferrule, or coaxial or triaxial contact, the element 20 being crimped onto the wire. In the example, the specimens 14 are "double," that is, they comprise two elements 20, 22 located at two ends of the wire. The specimens 14 may differ from one another in the type of wire 18, element(s) 20, 22, or crimping method, in particular the crimping tool used, such as pliers.

[0045] The qualification of specimens 14 consists of carrying out certain electrical tests to determine whether these specimens meet certain criteria, for example those defined by the RCC-E standard of 2019.

[0046] The specimens 14 to be tested are located in a plurality of locations 24 defined by the device 12, for example parallel to each other. The specimens 14 extend, for example, all in the same longitudinal direction L. The specimens 14 form, for example, a row 26 in a transverse direction T perpendicular to the longitudinal direction L.

[0047] The longitudinal direction L and the transverse direction T are, for example, substantially horizontal when the device 12 rests on a horizontal surface S such as the floor of a laboratory (not shown).

[0048] Each of the wires 18, for example, has four intermediate stripped portions 18A, 18B, 18C, 18D, each advantageously extending over a little more than 10 mm longitudinally. The four intermediate portions 18A to 18D and the elements 20, 22 are intended to form contact points for testing.

[0049] Due to their exposed intermediate portions, the specimens 14 are not intended for use after qualification. Qualification serves to indicate that connecting wires (not shown) corresponding to a given specimen 14 that has successfully passed qualification are fit for service. Device

[0050] The device 12 includes a test area 28 (Figures 1 and 2) forming the slots 24 respectively intended to receive the specimens 14 to be tested, the specimens being intended to remain in the slots during the test. The device 12 includes a programmable power supply 30, and an electrical circuit 32 adapted to electrically connect the slots 24 to the power supply 30. Advantageously, the device 12 includes a control panel 34 (Figures 1 and 5) to facilitate the use of the device.

[0051] In the example, the device 12 comprises a chassis 36, advantageously equipped with wheels 38, on which the test area 28, the power source 30, and the control panel 34 are fixed, for example in the form of compartments 40 advantageously superimposed in a vertical direction V. The device 12 thus forms a mobile test bench, which can advantageously be moved within a building (not shown) or between two buildings.

[0052] According to variants not shown, the compartments 40 are arranged in arrangements other than a vertical superposition.

[0053] Still in the example, the device 12 includes a cover 42 adapted to cover the test area 28, so as to prevent unintentional mechanical or electrical contact between an object or a user (not shown) and the specimens 14 or the locations 24 during qualification.

[0054] Advantageously, the device 12 includes a ventilation plate 44 located between the control panel 34 and the test area 28. In the example, the device 12 includes a socket rack 46 and an electrical distribution compartment 48 located between the power source 30 and the control panel 34, as well as a storage drawer 50, for example located under the power source.

[0055] The hood 42 is, for example, transparent and advantageously made of poly(methyl methacrylate). The hood 42 advantageously has lateral openings 52 allowing air circulation in the test area 28.

[0056] The hood 42 is for example rotatably mounted on the chassis 36 and jacks (not shown) allow the hood 42 to be kept open when the specimens 14 are being put in place. Test area and locations

[0057] In the example, the test area 28 is located at an upper end 54 of the device 12, so that an operator can easily place the specimens 14 to be tested there, and then remove them after the test.

[0058] In the example, the test area 28 forms a rectangular and substantially horizontal plateau.

[0059] Alternatively, the test area 28 has a different shape, and / or a possible inclination.

[0060] The test area 28 includes for example a support 56 made of electrically insulating material, for example polyoxymethylene.

[0061] In the example, the locations 24 are structurally identical to each other.

[0062] Each of the locations 24 comprises two extreme electrical contacts 5 8A, 58B belonging to the electrical circuit 32 and adapted to be in contact with two ends 61 A, 61B of one of the specimens 14, these ends being formed in the example by the two elements 20, 22. Each of the locations 24 includes for example four intermediate electrical contacts 58C, 58D, 58E, 58F adapted to be in contact with the intermediate portions 18A, 18B, 18C, 18D of one of the specimens 14. Each of the locations 24 advantageously includes three fixing members 60A, 60B, 60C adapted to hold the wire 18 of one of the specimens 14, advantageously in a predetermined position with respect to the test area 28.

[0063] According to an alternative not shown, for example if the specimens 14 are "simple" specimens, with a single crimped element, the ends 61A, 61B of the specimens in contact with the extremal contacts are formed by the single element and by a portion of bare wire. In this case, there is, for example, only one intermediate contact, and one or two fastening members.

[0064] In the example, the intermediate electrical contacts 58C, 58F are 50 mm from the outermost contacts 58A, 58B in the longitudinal direction L, and the intermediate electrical contacts 58D, 58E are 100 mm from the intermediate electrical contacts 58C, 58D. The two central intermediate electrical contacts 58D, 58E are separated by a distance of at least 150 mm.

[0065] The fastening elements 60A, 60B, 60C are advantageously clamps adapted to close around the wire, for example of the PANDUIT FCM1-S6-C14 type. Electrical contacts in the locations

[0066] Advantageously, the extreme electrical contacts 58A, 58B and the intermediate electrical contacts 58C, 58D, 58E and 58F are structurally identical to each other.

[0067] As shown in [Fig. 4], the outermost electrical contacts 58A, 58B and the intermediate electrical contacts 58C, 58D, 58E and 58F comprise, for example, at least two bars 62, adapted to be located on either side of one of the specimens 14 in a clamping direction SI, for example, substantially vertical. The outermost and intermediate electrical contacts include a system 64 for bringing the two bars 62 closer together in the clamping direction SI, for example, two bolts 64A, 64B.

[0068] The bars 62 are for example made of tinned copper, and extend advantageously in the transverse direction T.

[0069] The bars 62 are, for example, tightened onto the wire 18 or the elements 20, 22 with a tightening torque of 1 Nm Power source

[0070] The current source 30 is adapted to deliver an adjustable current I in the electrical circuit 32, for example in a range of 0.5 to 40 A, and advantageously according to one or more predetermined time schemes which will be explained later down.

[0071] Advantageously, the current source 30 is intrinsically mobile between a first supply configuration, in which the current source is adapted to deliver a current in a first direction il in the electrical circuit 32, and a second supply configuration, in which the current source is intended to deliver a current in a second direction i2 opposite to the first direction.

[0072] Alternatively, an inverter circuit (not shown) connecting the current source 30 to the electrical circuit 32 makes it possible to obtain this functionality.

[0073] The current source 30 is for example of the type EA-PSI 9080-60A 2U. Electrical circuit

[0074] The electrical circuit 32 is partly schematically represented on [Fig.2] showing the test area 28, and also more fully on [Fig.5] showing the control panel 34, which includes a visual representation 65 of the electrical circuit 32. For convenience, the same numerical references are used to designate parts of the electrical circuit 32 on [Fig.2] and corresponding parts of the visual representation 65 of the electrical circuit 32 on [Fig.5].

[0075] The electrical circuit 32 comprises a plurality of contactors C2 to C20 (numbered in ascending order from left to right on [Fig.2]) adapted to be open or closed and to define, in combination with each other, a plurality of electrical circuit configurations comprising configurations of a first type, and advantageously a configuration of a second type.

[0076] In the configurations of the first type, only one of the locations 24 is selectively connected electrically to the current source 30. The other locations 24 are disconnected from the current source 30, and only one of the specimens 14 is intended to carry a current. This allows each of the specimens 14 to be tested individually, for example by resistance measurements between the contact points.

[0077] In the second type of configuration, all the locations 24 are connected in series to the current source 30, and all the specimens 14 are intended to be traversed in series by a current, for example according to advantageously pre-programmed cycles. This makes it possible to simulate the use of the specimens 14, with periods of heating by Joule effect when a current flows, and periods of cooling when the current is zero.

[0078] For example, the electrical circuit 32 comprises a first main branch 32A and a second main branch 32B electrically connected to two terminals 66A, 66B of the current source 30 respectively, the locations 24 being connected, in parallel with each other, to the first main branch 32A and to the second main branch 32B.

[0079] The plurality of contactors C2 to C20 includes, for example, a first group of contactors C2, C4, C6 ... C19 located respectively between positions 24 and the second main branch 32B. As will be seen, the first group of contactors makes it possible to obtain the configurations of the first type.

[0080] The plurality of contactors C2 to C20 advantageously includes a second group of contactors C3, C5, C7 ... C19 located in the first main branch 32A and in the second main branch 32B. The contactors of the second group are adapted, when all open and the contactors of the first group all closed, to define an "S" path 68 through all the locations 24, and alternately the first main branch 32A and the second main branch 32B. This path 68 is adapted to pass in series a current, from one of the two terminals 66A, 66B of the current source, through all the specimens, from a first 14A of the specimens 14 to a last 14B of the specimens 14. The electrical circuit 32 then also includes a return branch 32C ([Fig.5]) intended to electrically connect the last 14B of the specimens 14 to the other of the two terminals 66A, 66B of the current source 32, and a selector C21 ([Fig.5]) to selectively connect the second main branch 32B or the return branch 32C to the other of the two terminals 66A, 66B. .

[0081] The second type configuration is thus obtained when the contactors C3, C5 ... C19 of the second group are open, the contactors C2, C4 ... C20 of the first group are closed, and the return branch 32C is connected to the other of the two terminals 66A, 66B.

[0082] Those skilled in the art will understand that the above is only an example of an architecture for the electrical circuit 32. The invention is not limited to this particular architecture. Control Panel

[0083] The control panel 34 is, for example, located on a front side face 70 of the device 12 ([Fig. 1]). By "front" is meant the side on which the operator is intended to stand when performing the tests.

[0084] As seen in [Fig.5], corresponding to the visual representation of the electrical circuit 32, the control panel 34 includes a plurality of switches SW2 to SW20 adapted to control the contactors C2 to C20 respectively and to switch the electrical circuit 32 from any one configuration of said plurality of configurations to any other.

[0085] The control panel 34 includes, for example, a plurality of female plugs 72 respectively connected to the electrical contacts 58A to 58F of the locations 24, in order to allow the connection of the measuring devices 16.

[0086] The control panel 34 advantageously includes a suitable SW 1 switch to switch the power supply 30 selectively from one to the other of the first power configuration and the second configuration (under il or i2 of the current).

[0087] The control panel 34 also includes a switch SW21 to actuate the selector C21 (which selects the second main branch 32B or the return branch 32C). How the system works

[0088] The operation of assembly 10 will now be described, in particular to illustrate a qualification process according to the invention.

[0089] First, the test specimens 14 are placed in the positions 24 of the test area 28 (Figures 2 and 3). In the example, for each of the specimens 14, the two elements 20, 22 are clamped respectively in the outermost contacts 58A, 58B. The intermediate portions 18A to 18D are clamped in the electrical contacts 58C to 58F. The fastening members 60A to 60C advantageously hold the wire 18 in a predetermined position relative to the test area 28. The wire 18 is advantageously straight.

[0090] To secure the specimens 14, they are placed between the two bars 62 of each of the electrical contacts 58A to 58F, and the upper bar 62 is brought closer to the lower bar 62 using the bolts 64A, 64B. The specimens 14 remain in the positions 24 for the entire duration of the tests during which the specimens are subjected to certain electrical currents and electrical measurements are taken from the specimens 14.

[0091] Then, in a first phase, the electrical circuit 32 is placed in one of the configurations of the first type, which amounts to choosing one of the locations 24. In the example, switches SW3, SW5 ... SW19 are operated to close all the contactors C3, C5 ... C19 of the second group, and only one of the contactors C2, C4 ... C20 of the first group corresponding to the specimen 14 under consideration is selectively closed. The selector C21 is placed in a position such that the second main branch 32B is connected to the terminal 66B of the current source 30.

[0092] The measuring devices 16 are connected to the plugs 72 of the control panel 34 corresponding to the location 24 of the specimen 14 in question. The locations are, for example, numbered SP1 to SP10 on the control panel 34.

[0093] Alternatively, in the absence of the control panel 34, the measuring devices 16 are connected, for example, directly to the location 24.

[0094] A current is passed through the relevant specimen 14, for example in direction 11. The current has, for example, an intensity of 1.0 A / mm² of the cross-section of the wire 18. Four voltages U1, U2, U3, U4 are then measured as shown in [Fig. 5]. Knowing the current intensity, the electrical resistances between the electrical contacts are calculated. between extreme contact 58A and intermediate electrical contact 58C, and between intermediate electrical contact 58C and intermediate electrical contact 58D, and, symmetrically on the other side of specimen 14, between extreme electrical contact 58B and intermediate electrical contact 58F, and between intermediate electrical contact 58F and intermediate electrical contact 58E. This makes it possible, in particular, to obtain the contact resistance at elements 20, 22, as required, for example, by the 2019 RCC-E standard.

[0095] If the measuring devices 16 are internal to the device 12, the measured voltages U1 to U4 are displayed for example on the control panel 34.

[0096] The above operations are advantageously also carried out by passing the current in the second direction i2 for each of the specimens 14.

[0097] These operations are carried out, for example, successively on all 14 specimens to be tested.

[0098] Then, in a second phase, the electrical circuit 32 is advantageously configured as in the second type. In the example, switches SW3, SW5 ... SW19 are operated to open all contactors C3, C5 ... C19 of the second group and all contactors C2, C4 ... C20 of the first group are closed. Selector C21 is placed in a position such that the return branch 32C is connected to terminal 66B of the current source 30. A current is passed through the "S" shaped path 68 through all the specimens 14 in series. This current is, for example, 4.0 A / mm² of wire cross-section 18 advantageously for 45 minutes, then zero for 15 minutes, for example. This current profile is repeated for 20 hours to simulate the use of the specimens 14.

[0099] If the electrical circuit 30 does not have a configuration of the second type, each of the specimens 14 can be successively subjected to the current profile above using the configurations of the first type. The advantage of the configuration of the second type is that this can be done simultaneously.

[0100] Then, in a third phase, the operations of the first phase are advantageously repeated to verify that there is not too great a change in the contact resistances obtained.

[0101] Thanks to the characteristics of the device 12 described above, in particular the plurality of configurations of the electrical circuit 32, the qualification of the specimens 14 is facilitated. The device 12 makes it possible, for example, to qualify ten double specimens 14, which is equivalent to processing twenty single specimens. The device 12 ensures good reproducibility of the results, while offering good ergonomics and safety for the user.

[0102] The second type of configuration allows, in particular, a significant time saving, by simultaneously subjecting all the specimens 14 to a current profile (called a current profile). "cycling").

Claims

Demands

1. Device (12) for qualifying a plurality of specimens (14), each of the specimens (14) comprising a wire (18) and at least one element (20, 22) crimped onto the wire (18), the device (12) comprising: - a test area (28) forming a plurality of locations (24) respectively intended to receive the specimens (14) to be tested, - a programmable current source (30), and - an electrical circuit (32) adapted to electrically connect the locations (24) to the current source (30), the electrical circuit (32) comprising a plurality of contactors (C1 to C21) adapted to be open or closed and to define, in combination with each other, a plurality of configurations of the electrical circuit (32), the plurality of configurations comprising configurations of a first type, in which: - only one of the locations (24) is selectively electrically connected to the current source (30),- the other locations (24) are disconnected from the current source (30), and - only one of the specimens (14) is intended to carry a current.

2. Device (12) according to claim 1, wherein the plurality of electrical circuit configurations includes at least one configuration of a second type, in which: - all locations (24) are connected in series to the current source (30), and - all specimens (14) are intended to be traversed in series by a current.

3. Device (12) according to claim 1 or 2, comprising a control panel (34) comprising a plurality of switches (SW1 to SW21) adapted to control the contactors (C1 to C21) respectively and to switch the electrical circuit (32) from any one configuration of said plurality of configurations to any other.

4. Device (12) according to claim 3, wherein the current source (30) is movable between a first supply configuration, in which the current source (30) is intended to deliver a current in a first direction (11) in the electrical circuit (32), and a second supply configuration, in which the current source (30) is intended to deliver a current in a second direction (12) opposite to the first direction (il), the control panel (34) including a switch (SW 1) adapted to selectively switch the power supply (30) from one to the other of the first power configuration and the second configuration.

5. Device (12) according to claim 3 or 4, wherein the control panel (34) comprises a visual representation (65) of the electrical circuit (32), and a plurality of female plugs (72) respectively connected to electrical contacts (58) of the slots (24), the electrical contacts (58) being intended to be in contact with the specimens (14).

6. Device (12) according to any one of claims 1 to 5, wherein each of the locations comprises: - two extreme electrical contacts (58A, 58B) belonging to the electrical circuit (32) and intended to be in contact with two ends (61A, 61B) of one of the specimens, and - one or more intermediate electrical contacts (58C, 58D, 58E, 58F) intended to be in contact with intermediate portions (18A to 18D) of one of the specimens (14).

7. Device (12) according to claim 6, wherein each of the extreme electrical contacts (58A, 58B) and the intermediate electrical contact(s) (58C, 58D, 58E, 58F) comprise at least two tinned copper bars (62) intended to be located on either side of one of the specimens (14) in a clamping direction (SI), and a system (64) for bringing the two bars (62) closer together in the clamping direction (SI).

8. Device (12) according to any one of claims 1 to 7, wherein each of the locations (24) comprises one or more fixing members (60A, 60B, 60C) adapted to immobilize the wire (18) of one of the specimens (14) with respect to the test area (28).

9. Device (12) according to any one of claims 1 to 8, wherein the electrical circuit (32) comprises a first main branch (32A) and a second main branch (32B) electrically connected to two terminals (66A, 66B) of the current source (30) respectively, the locations (14) being connected, in parallel with each other, to the first main branch (32A) and to the second main branch (32B), the plurality of contactors (C1 to C21) comprising a first group of contactors (C2, C4 ... C20) located respectively between the locations (14) and the second main branch (32B).

10.

11.

12. Device (12) according to claim 9, wherein the plurality of contactors (C1 to C21) comprises a second group of contactors (C3, C5 ... C19) located in the first main branch (32A) and in the second main branch (32B), the contactors of the second group (C3, C5 ... C19) being adapted, when all open and the contactors (C2, C4 ...C19) of the first group are all closed, to define an "S" path (68) via all the locations (14) and alternately the first main branch (32A) and the second main branch (32B), this path (68) being intended to pass in series a current, from one of the two terminals (66A, 66B) of the current source (30), in all the specimens (14), from a first (14A) of the specimens (14) to a last (14B) of the specimens (14), the electrical circuit (32) comprising a return branch (32C) intended to electrically connect the last (14B) of the specimens to the other of the two terminals (66A, 66B) of the current source (30). Device (12) according to any one of claims 1 to 10, comprising a chassis (36), preferably equipped with wheels (38), on which the test area (28), the power source (30), and the control panel (34) are fixed, for example in the form of compartments (40) preferably superimposed in a vertical direction (V), the device (12) being adapted to form a mobile test bench. A method for qualifying a plurality of specimens (14), each specimen (14) comprising a wire (18) and at least one element (20, 22) crimped onto the wire (18), the method comprising the following steps: - obtaining a device (12) as described in any one of claims 1 to 10, - placing the specimens (14) to be tested in the plurality of locations (14), - setting up the electrical circuit (32) in each of the configurations of the first type to electrically connect only one of the locations (14) to the current source (30), the other locations (14) being disconnected from the current source (30), with only one of the specimens (14) carrying a current, - performing measurements on the specimens (14), - the specimens (14) remaining in the locations (14) during the measures.

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