Test jig

Abstract

To provide a testing jig which facilitates connection of a testing plug to a screw type terminal strip.SOLUTION: The test jig 1 according to the present embodiment includes the jig body 4 that is attachable to and detachable from the screw type terminal strip 34. A plug insertion port 11 into which the test plug 72 is inserted is provided on the front surface side of the jig body 4. Movable electrodes 14 and 15 are provided on the rear surface of the jig body 4 at positions where they come into contact with the heads of the screw terminals 41 of the screw type terminal strip 34 when the jig body 4 is attached to the screw type terminal strip 34. At least a part of the movable electrodes 14, 15 is composed of a conductive spring 14. A fixed electrode 12 is provided in the plug insertion port 11. The fixed electrode 12 is electrically connected to the movable electrodes 14 and 15, and is electrically connected to the test plug 72 when the test plug 72 is inserted into the plug insertion port 11.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to a test fixture that can be attached to a screw-type terminal block. [Background technology]

[0002] An example of a conventional testing jig is disclosed in Patent Document 1. The terminal block connecting jig disclosed in Patent Document 1 is attached to an external connection terminal block having a plurality of external terminals, and brings spring-type contacts into contact with the external terminals. The spring-type contacts include a rod inserted into a contact mounting hole formed in a circuit board, a plunger attached to one end of the rod and contacting the external terminals, and a compression coil spring that presses the plunger against the external terminals. A simulation test cable is connected to the other end of the rod, thereby connecting the external terminals to the simulation test cable wired to the spring-type contacts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-206637 Summary of the Invention [Problem to be solved by the invention]

[0004] A plug may be used to connect a cable to a test jig. The test plug is connected to an electrode on the test jig by inserting the test plug into a socket on the test jig.

[0005] When connecting a test plug to the terminal block connecting jig disclosed in Patent Document 1, the electrode to which it is connected is the tip of the rod of the spring-type contact. However, the position of the rod tip changes up and down depending on the height of the external terminal with which the plunger contacts. In particular, if the external connection terminal block is a screw-type terminal block, the terminal screw will lift up when the terminal is attached to the screw-type terminal block, causing the tip of the rod to protrude significantly from the contact mounting hole. It is not easy to properly connect a test plug to an electrode whose position is unstable.

[0006] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a test fixture that makes it easy to connect a test plug to a screw-type terminal block. [Means for solving the problem]

[0007] According to one embodiment of the present disclosure, a test jig has a jig body that is detachable from the surface of a screw-type terminal block. A plug insertion port into which a test plug is inserted is provided on the surface side of the jig body. A fixed electrode is fixedly provided within the plug insertion port. The fixed electrode is electrically connected to the test plug when the test plug is inserted into the plug insertion port. A movable electrode is provided on the back side of the jig body at a position that will come into contact with the head of the terminal screw of the screw-type terminal block when the jig body is attached to the screw-type terminal block. The movable electrode is electrically connected to the fixed electrode, and at least a portion of the movable electrode is composed of a conductive spring. [Effects of the Invention]

[0008] With the test jig configured as described above, the lift of the terminal screw that occurs when attaching a terminal to the screw-type terminal block is absorbed by the compression of the spring of the movable electrode that contacts the terminal screw. This allows the test jig body to be securely fixed to the screw-type terminal block. Furthermore, since the position of the fixed electrode does not change depending on the position of the movable electrode, the degree of lift of the terminal screw that occurs when attaching the terminal does not affect the conductivity of the fixed terminal with the test plug. Therefore, with this test jig, to connect a test plug to the screw-type terminal block, it is sufficient to simply insert the test plug into the plug insertion port. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view showing the appearance of a test jig according to a first embodiment. [Figure 2] 1 is a side view of a long side showing the appearance of a test jig according to a first embodiment. FIG. [Figure 3] 1 is a side view of a short side showing the appearance of a test jig according to a first embodiment. FIG. [Figure 4] 2 is a cross-sectional view of the long side showing the internal structure of the test jig according to the first embodiment. FIG. [Figure 5] 2 is a cross-sectional view of the short side showing the internal structure of the test jig according to the first embodiment. FIG. [Figure 6] 1 is a plan view showing the appearance of a test jig according to a first embodiment attached to a screw-type terminal block. FIG. [Figure 7] 1 is a side view of a short side showing the appearance of a test jig according to a first embodiment attached to a screw-type terminal block. FIG. [Figure 8] 1 is a cross-sectional view of the long side showing the internal structure of a test jig according to a first embodiment attached to a screw-type terminal block. FIG. [Figure 9] 1 is a cross-sectional view of the short side showing the internal structure of a test jig according to a first embodiment attached to a screw-type terminal block. FIG. [Figure 10] 1 is a partial cross-sectional view of the long side showing a state in which the testing jig according to the first embodiment is attached to a screw-type terminal block and the terminals are attached to terminal screws. FIG. [Figure 11] 1 is a cross-sectional view of the short side showing a state in which the testing jig according to the first embodiment is attached to a screw-type terminal block and the terminals are attached to terminal screws. FIG. [Figure 12] 1 is a cross-sectional view of the short side showing a state in which the testing jig according to the first embodiment is attached to a screw-type terminal block and the terminals are attached to terminal screws. FIG. [Figure 13] FIG. 10 is a cross-sectional view of the short side showing the internal structure of a test jig according to a second embodiment. [Figure 14] FIG. 10 is a cross-sectional view of the short side showing the internal structure of a test jig according to a second embodiment attached to a screw-type terminal block. [Figure 15] FIG. 11 is a partial cross-sectional view of the long side showing the internal structure of a test jig according to a third embodiment attached to a screw-type terminal block. [Figure 16] FIG. 11 is a partial cross-sectional view of the long side showing a state in which a testing jig according to a third embodiment is attached to a screw-type terminal block and terminals are attached to terminal screws. [Figure 17] FIG. 2 is a plan view showing an example of the configuration of a screw-type terminal block. [Figure 18] FIG. 2 is a cross-sectional view taken along line AA showing an example of the configuration of a screw-type terminal block. DETAILED DESCRIPTION OF THE INVENTION

[0010] 1. First embodiment 1-1. Screw-type terminal block configuration example First, an example of the configuration of a screw terminal block to which a test jig is attached will be described with reference to FIGS. 17 and 18. FIG. 17 is a top view of the screw terminal block 34, and FIG. 18 is a cross-sectional view of the screw terminal block 34 taken along line AA in FIG. 17. Hereinafter, because explanations will be given using drawings viewed from multiple directions, the directions X, Y, and Z will be defined as follows. The longitudinal direction of the screw terminal block 34, i.e., the direction from left to right on the paper in FIG. 17, is defined as the X direction, and the unilateral direction of the screw terminal block 34, i.e., the direction from bottom to top on FIG. 17, is defined as the Y direction. In FIG. 18, the Y direction is the lateral direction of the screw terminal block 34, i.e., the direction from right to left on the paper, and the Z direction is the height direction of the screw terminal block 34, i.e., the direction from bottom to top on the paper. X, Y, and Z are perpendicular to each other.

[0011] The screw-type terminal block 34 has a plurality of terminal screws 41, 51 arranged in two rows. A conductive plate 61 is laid on the fastening surface where the terminal screws 41, 51 are fastened. The conductive plate 61 is shared between adjacent terminal screws 41 in the first row and terminal screws 51 in the second row. In other words, the terminals 41 in the first row and terminals 51 in the second row that are in the same horizontal position (same position in the X direction) in Figure 17 are electrically connected. Generally, in a distribution board, a terminal block is used as a wiring relay device, with the terminals in the first row (or second row) used to connect wiring inside the board and the terminals in the second row (or first row) used to connect wiring outside the board.

[0012] A pressing fitting 42 and a spring washer 41A are fitted between the head of the terminal screw 41 and the conductive plate 61. A pressing fitting 52 and a spring washer 51A are fitted between the head of the terminal screw 51 and the conductive plate 61. The pressing fitting 42 is configured so that when the terminal screw 41 is loosened, the force of the spring 42A creates a gap between the conductive plate 61 and the terminal screw 41 and pressing fitting 42, making it easy to connect the wiring terminals. The pressing fitting 52 is configured so that when the terminal screw 51 is loosened, the force of the spring 52A creates a gap between the conductive plate 61 and the terminal screw 51 and pressing fitting 52, making it easy to connect the wiring terminals.

[0013] When connecting a terminal to the terminal screw 41, the terminal screw 41 is loosened and the wiring terminal is inserted between the pressing metal fitting 42 and the conductive plate 61. When connecting a wiring terminal to the terminal screw 51, the terminal screw 51 is loosened and the terminal is attached between the pressing metal fitting 52 and the conductive plate 61. The terminal may be, for example, a U-shaped terminal or a round terminal. A partition 36 is provided between adjacent terminal screws in each row, so that adjacent terminals do not come into contact when connected to the terminal screws 41, 51. Note that, for the sake of simplification, spring washers and other parts that are not essential to the present invention may be omitted in figures other than Figures 17 and 18.

[0014] A symbol plate 38 is disposed between the first row of terminal screws 41 and the second row of terminal screws 51. The symbol plate 38 is a white plate on which the user can write necessary information. Any writing can be done on the symbol plate 38, for example, a terminal number can be written. A plurality of recesses 35 are provided on the long side of the screw-type terminal block 34 of the partition section 36. The recesses 35 are generally used to attach a terminal block cover 37, and in the present invention, are used to attach a test jig to the screw-type terminal block 34. Note that the screw-type terminal block 34 illustrated here is a self-up type, but the screw-type terminal block may also be, for example, a screw-up type. The terminal block cover 37 is attached to prevent workers and others from coming into contact with live parts such as the terminal screws 41 and 51 and receiving an electric shock, and is generally made of a transparent material.

[0015] 1-2.Configuration of test jig The configuration of the test jig according to the first embodiment will be described with reference to FIGS. 1 to 9. First, the appearance of the test jig 1 will be described. FIG. 1 is a plan view showing the appearance of the test jig 1, FIG. 2 is a side view of the long side showing the appearance of the test jig 1, and FIG. 3 is a side view of the short side showing the appearance of the test jig 1. In FIGS. 1 to 3, opaque parts are hatched. In FIGS. 1 and 6, the X direction is from left to right on the page, and the Y direction is from bottom to top on the page. In FIGS. 2, 4, and 8, the X direction is from left to right on the page, and the Z direction is from bottom to top on the page. In FIGS. 3, 5, 7, and 9, the Y direction is from right to left on the page, and the Z direction is from bottom to top on the page.

[0016] The test jig 1 has a jig body 4 that is made to fit the shape of the screw-type terminal block 34 to which it is attached. The jig body 4 is attached to the screw-type terminal block 34 using claws 6 provided on both long side surfaces of the jig body 4. The jig body 4 is made of a transparent material such as acrylic. The surface of the jig body 4 is provided with two rows of multiple plug insertion ports 11, 21 into which test plugs are inserted. The first row of plug insertion ports (first plug insertion ports) 11 are made to fit the positions of the first row of terminal screws 41, and the second row of plug insertion ports (second plug insertion ports) 21 are made to fit the positions of the second row of terminal screws 51.

[0017] Fixed electrodes (first fixed electrodes) 12 are fixedly provided to the jig body 4 within the first row of plug insertion ports 11. The fixed electrodes 12 are connected to metal plates 13 provided for each fixed electrode 12 within the jig body 4. The fixed electrodes 12 protrude from the bottom surface of the plug insertion ports 11 as shown in FIG. 4 or 5. Fixed electrodes (second fixed electrodes) 22 are also fixedly provided to the jig body 4 within the second row of plug insertion ports 21. The fixed electrodes 22 are connected to metal plates 23 provided for each fixed electrode 22 within the jig body 4. The fixed electrodes 22 protrude from the bottom surface of the plug insertion ports 21 as shown in FIG. 5. The fixed electrodes 12, 22 are electrically connected to the test plugs when the test plugs are inserted into the plug insertion ports 11, 21.

[0018] A plurality of metal plunger heads 15, 25 are arranged in two rows on the back side of the jig body 4. The plunger heads 15 in the first row are arranged on the back side of the first row of plug insertion ports 11, in positions that will come into contact with the heads of the first row of terminal screws 41 when the jig body 4 is attached to the screw-type terminal block 34. The plunger heads 25 in the second row are arranged on the back side of the second row of plug insertion ports 12, in positions that will come into contact with the heads of the second row of terminal screws 51 when the jig body 4 is attached to the screw-type terminal block 34.

[0019] Next, we will explain the internal structure of the test jig 1. Figure 4 is a cross-sectional view of the long side showing the internal structure of the test jig 1, and Figure 5 is a cross-sectional view of the short side showing the internal structure of the test jig 1. In Figures 4 and 5, opaque parts are hatched or shown in black.

[0020] Plunger head 15 is connected to metal plate 13 by metal spring 14. Plunger head 25 is connected to metal plate 23 by spring 24. Plunger heads 15, 25 and springs 14, 24 are all made of metal, so that when plunger head 15 comes into contact with the head of terminal screw 41, electrical continuity is established from terminal screw 41 to fixed electrode 12, and when plunger head 25 comes into contact with the head of terminal screw 51, electrical continuity is established from terminal screw 51 to fixed electrode 22. Plunger head 15 and spring 14 form a movable electrode (first movable electrode), while plunger head 25 and spring 24 form a movable electrode (second movable electrode). Spring 14 is preferably made of a material suitable for spring properties and electrical conductivity, such as phosphor bronze.

[0021] Spring 14 is housed in guide hole 16 formed on the back side of jig body 4, and guide hole 16 restricts the movement of plunger head 15 to a direction perpendicular to the head of terminal screw 41. Spring 24 is housed in guide hole 26 formed on the back side of jig body 4, and guide hole 26 restricts the movement of plunger head 25 to a direction perpendicular to the head of terminal screw 51.

[0022] Next, the state in which test jig 1 is attached to screw terminal block 34 will be described. First, cover 37 attached to screw terminal block 34 is removed. Then, test jig 1 is attached to screw terminal block 34 in place of cover 37. FIG. 6 is a plan view showing the appearance of test jig 1 attached to screw terminal block 34, and FIG. 7 is a side view of the short side showing the appearance of test jig 1 attached to screw terminal block 34. Also, FIG. 8 is a cross-sectional view of the long side showing the internal structure of test jig 1 attached to screw terminal block 34, and FIG. 9 is a cross-sectional view of the short side showing the internal structure of test jig 1 attached to screw terminal block 34.

[0023] When the test jig 1 is attached to the screw terminal block 34, the first row of plug insertion ports 11 and the second row of plug insertion ports 21 are positioned to sandwich the symbol plate 38 when viewed from above. Therefore, the characters on the symbol plate 38 are not covered by the metal plates 13, 23 provided below the plug insertion ports 11, 21. In addition, because the test jig 1 is made of a transparent material, the characters written on the symbol plate 38 can be seen even when the test jig 1 is attached to the screw terminal block 34.

[0024] 7, test jig 1 is attached to screw-type terminal block 34 by placing jig body 4 on the surface of screw-type terminal block 34 and hooking claws 6 of jig body 4 into recesses 35 of screw-type terminal block 34. When jig body 4 is attached to screw-type terminal block 34, plunger head 15 comes into contact with the head of terminal screw 41, and plunger head 25 comes into contact with the head of terminal screw 51 inside. At this time, springs 14 and 24 are compressed, so plunger head 15 is pressed against the head of terminal screw 41 by the force of spring 14, and plunger head 25 is pressed against the head of terminal screw 51 by the force of spring 24.

[0025] 1-3. Functions of the test fixture Next, the function of the test jig 1 configured as described above will be described with reference to FIGS. 10 to 12. In FIG. 10, the X direction is from right to left on the page, and the Z direction is from bottom to top on the page. In FIGS. 11 and 12, the Y direction is from right to left on the page, and the Z direction is from bottom to top on the page. FIG. 10 is a partial cross-sectional view of the long side showing the test jig 1 attached to the screw-type terminal block 34 with the wiring terminal 71 attached to the first terminal screw 41 from the left of the screw-type terminal block 34. FIGS. 11 and 12 are cross-sectional views of the short side showing the test jig 1 attached to the screw-type terminal block 34 with the wiring terminal 71A attached to the terminal screw 41 and the wiring terminal 71B attached to the terminal screw 51.

[0026] As shown in Figure 10, if the terminal 71 is a U-shaped terminal or a round terminal, the terminal screw 41 is loosened and the terminal 71 is inserted between the pressing metal fitting 42 and the conductive plate 61. As a result, the terminal screw 41 is raised by at least the thickness of the terminal 71. As the terminal screw 41 is raised, the plunger head 15 is pushed into the guide hole 16, but the displacement of the plunger head 15 is absorbed by the compression of the spring 14. Although a reaction force is generated by the compression of the spring 14, the jig body 4 and the screw-type terminal block 34 are firmly fixed by the claws 6 and the recesses 35, so the reaction force of the spring 14 does not cause the jig body 4 to come off the screw-type terminal block 34. This allows the test jig 1 to be securely fixed to the screw-type terminal block 34.

[0027] Furthermore, because the position of the plunger head 15 does not change the position of the fixed electrode 12, the degree to which the terminal screw 41 lifts up when the terminal 71 is attached does not affect the conductivity of the fixed electrode 12 with the test plug 72. Therefore, with the test jig 1, to connect the test plug 72 to the screw-type terminal block 34, it is sufficient to simply insert the test plug 72 into the plug insertion port 11. Simply inserting the test plug 72 into the plug insertion port 11 stably connects the test plug 72 to the fixed electrode 12. The test plug 72 has a connector function that ensures stable electrical contact with the fixed electrode 12. The test plug 72 has a spring-like conductive object made of a material such as phosphor bronze, and the test wiring is connected to the spring-like conductive object. By inserting the test plug 72 into the plug insertion port 11, the fixed electrode 12 comes into contact with the spring-like conductive object inside the test plug 72, and the test wiring attached to the test plug 72 is securely connected to the terminal screw 41 of the terminal block 34.

[0028] The plug insertion port into which the test plug 72 is inserted may be the plug insertion port 21 in the second row. The plug insertion ports 11 and 21 have the same shape, and it is preferable that the fixed electrodes 12 and 22 have the same shape. Due to the connector function of the test plug 72, simply inserting the test plug 72 into the plug insertion port 21 stably connects the test plug 72 to the fixed electrode 22. In FIG. 10 , the second and third terminal screws 41 from the left do not have terminals attached, so the heads of the second and third terminal screws 41 from the left are lower than the head of the first terminal screw 41 from the left. However, this height difference is absorbed by the spring 24, so the height difference between the head of the first terminal screw 41 from the left and the second and third terminal screws 41 from the left does not affect the electrical continuity between the fixed electrode 12 and the test plug 72. The same is true for the second row.

[0029] Here, the simplification of the continuity check of the test wiring using the test jig 1 will be described with reference to FIGS.

[0030] 11, wiring terminal 71A is attached to the first row of terminal screws 41, and wiring terminal 71B is attached to the second row of terminal screws 51. Then, test jig 1 is attached to screw-type terminal block 34, and test plug 72 is inserted into plug insertion port 11. With this, a tester or the like is used to check for continuity between the end of the test wiring opposite test plug 72 and fixed electrode 22. If continuity is found, test jig 1 confirms that the first row of terminal screws 41 on terminal block 34 and the test wiring are securely connected.

[0031] 12, wiring terminal 71A is attached to the first row of terminal screws 41, and wiring terminal 71B is attached to the second row of terminal screws 51. Then, test jig 1 is attached to screw-type terminal block 34, and test plug 72 is inserted into plug insertion port 21. With this, a tester or the like is used to check for continuity between the end of the test wiring opposite test plug 72 and fixed electrode 12. If continuity is found, test jig 1 confirms that the test wiring is securely connected to the second row of terminal screws 51 on terminal block 34.

[0032] Note that checking the connection between test plug 72 and fixed electrode 12 or fixed electrode 22 may be omitted. In that case, after connecting the necessary wiring terminals 71A and 71B to the first row of terminal screws 41 and the second row of terminal screws 51, test jig 1 is attached to screw-type terminal block 34, and the continuity between fixed electrodes 12 and 22 located at the same position in the X direction is checked with a tester or the like. If there is continuity between all of the fixed electrodes 12 and 22 located at the same position in the X direction, it is confirmed that test jig 1 and terminal block 34 are securely connected.

[0033] As described above, the present invention provides a test jig that facilitates connection of a test plug to a screw-type terminal block. Furthermore, it is also easy to check the connection between the screw-type terminal block and the test jig or test plug.

[0034] 2. Second embodiment Fig. 13 is a cross-sectional view of the short side showing the internal structure of the test jig 2 according to the second embodiment. In Fig. 13, the direction from right to left on the page is the Y direction, and the direction from bottom to top on the page is the Z direction. The jig body 5 included in the test jig 2 is provided with a movable electrode consisting of a plunger head 15 and a spring 14 only on the back side of the plug insertion ports 11 in the first row. The fixed electrodes 12 provided in the plug insertion ports 21 in the second row are connected to the fixed electrodes 12 provided in the plug insertion ports 11 in the first row by a conductive plate 81.

[0035] FIG. 14 is a cross-sectional view of the short side showing the internal structure of test jig 2 attached to screw-type terminal block 34. In FIG. 14, the Y direction is from right to left on the page, and the Z direction is from bottom to top on the page. When test jig 2 is attached to screw-type terminal block 34, plunger head 15 comes into contact with first row of terminal screws 41. This establishes electrical connection between terminal screws 41 and fixed electrodes 12 via the movable electrode, i.e., plunger head 15 and spring 14. At the same time, terminal screws 41 and fixed electrodes 12 also establish electrical connection between the movable electrode and conductive plate 81. Therefore, with test jig 2, second row of plug insertion slots 21 can be used as extensions of first row of plug insertion slots 11.

[0036] 3. Third embodiment FIG. 15 is a partial cross-sectional view of the long side showing the internal structure of test jig 3 according to the third embodiment when attached to screw-type terminal block 34. In FIG. 15, the direction from right to left on the page is the X direction, and the direction from bottom to top on the page is the Z direction. Movable electrode 17 provided on test jig 3 is made of wire or a long, thin metal plate. Movable electrode 17 has a straight portion 17a and an arc portion 17b. Straight portion 17a is connected to fixed electrode 12, and arc portion 17b comes into contact with the head of terminal screw 41 when test jig 3 is attached to screw-type terminal block 34.

[0037] FIG. 16 is a partial cross-sectional view of the long side of the test jig 3, showing the state in which the test jig 3 is attached to the screw-type terminal block 34 and the terminal 71 is attached to the terminal screw 41. In FIG. 16, the X direction is from right to left on the paper, and the Z direction is from bottom to top on the paper. The lifting of the terminal screw 41 due to the attachment of the terminal 71 is absorbed by the bending of the arc portion 17b of the movable electrode 17. In other words, the arc portion 17b functions as a spring. In this way, the arc portion 17b also serves as the plunger head in the first embodiment, further reducing the number of parts of the test jig. Note that while FIGS. 15 and 16 show the first row, a similar configuration can be used for the second row. [Explanation of symbols]

[0038] 1, 2, 3 Test fixture 4, 5 Jig body 11, 21 Plug insertion port 12, 22 Fixed electrode 13, 23 metal plate 14 springs, 24 15, 25 plunger head 16, 26 guide holes 17 Movable electrode 34 Screw terminal block 35 recess 36 Partition 38 Symbol Plate 41, 51 Terminal screws 61 Conductive plate 71 terminals 72 Test plug 81 Conductive plate

Claims

1. a jig body that is detachable from the surface of the screw-type terminal block; a plug insertion port provided on the front surface side of the jig body, into which a test plug is inserted; a movable electrode, at least a portion of which is made of a conductive spring, provided on the rear surface side of the jig body at a position that comes into contact with a head of a terminal screw of the screw-type terminal block when the jig body is attached to the screw-type terminal block; a fixed electrode fixedly provided within the plug insertion port, which is electrically connected to the movable electrode and which is electrically connected to the test plug when the test plug is inserted into the plug insertion port. A test fixture characterized by:

2. 2. The test fixture according to claim 1, the movable electrode includes a plunger head that contacts the head of the terminal screw, and a spring that connects the plunger head to the jig body and is electrically connected to the fixed electrode; A guide hole is provided on the rear surface of the jig body to limit the movement of the plunger head in a direction perpendicular to the head of the terminal screw. A test fixture characterized by:

3. The test jig according to claim 1 or 2, the plug insertion port includes a first plug insertion port and a second plug insertion port; the fixed electrodes include a first fixed electrode provided in the first plug insertion port and a second fixed electrode provided in the second plug insertion port; the movable electrode includes a first movable electrode provided on a rear side of the first fixed electrode and conducting to the first fixed electrode, and a second movable electrode provided on a rear side of the second fixed electrode and conducting to the second fixed electrode, the first movable electrode is provided at a position that abuts against the heads of the terminal screws in the first row when the jig body is attached to the screw-type terminal block, The second movable electrode is provided at a position that contacts the head of a second row of terminal screws when the jig body is attached to the screw-type terminal block. A test fixture characterized by:

4. The test fixture according to claim 3, The jig body is made of a transparent material, The first plug insertion port and the second plug insertion port are provided at positions that sandwich a symbol plate of the screw-type terminal block when the jig body is attached to the screw-type terminal block in a top view. A test fixture characterized by:

Images