JP2016161383A - Terminal unit and resistance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an influence of a current flowing through a current terminal and an influence of an external magnetic field.SOLUTION: A resistance device includes banana jacks 41, 42 for respectively connecting to banana plugs 202a, 202b. The banana jack 41 has a cylindrical body 51 into which the banana plug 202a can be inserted, and an electrode 61 to be connected to the inserted banana plug 202a while the banana jack 42 has a cylindrical body 52 into which the banana plug 202b can be inserted, and a screw 62 to be connected to the inserted banana plug 202b. The resistance device also includes: a first cover part 71 arranged along an outer peripheral surface 51a of the cylindrical body 51 without being connected to the electrode 61; a second cover part 72 arranged along an outer peripheral surface 52a of the cylindrical body 52 while connected to the screw 62, and arranged apart from the first cover part 71; and a cover 44 having a connection part 73 for connecting the first cover part 71 and the second cover part 72 on one ends 51b, 52b of the cylindrical body 51 and the cylindrical body 52, respectively.SELECTED DRAWING: Figure 14

Description

  The present invention provides a terminal unit including a first connected terminal for connecting a non-coaxial type current input terminal and a second connected terminal for connecting a non-coaxial type current output terminal, and the terminal unit. The present invention relates to a resistance device provided.

  As a device including this type of terminal unit, a current converter disclosed in Patent Document 1 below is known. This current converter is an instrument used when a transmitter is calibrated, and includes a box-shaped case and input terminals (a positive input terminal and a negative input terminal) disposed on one side surface of the box-shaped case. And a pair of output terminals disposed on the other side surface of the box-shaped case, and a high-precision resistor disposed in the box-shaped case. In this case, the high-precision resistor has one end connected to one input terminal (plus input terminal) and one output terminal, and the other end connected to the other input terminal (minus input terminal) and the other output. Connected to the terminal. When calibrating the transmitter using this current converter, connect the signal current line from the transmitter to the input terminal of the current converter, connect the output terminal of the current converter to the voltmeter, and set the voltage value. Measure. The current value of the current flowing through the signal current line is calculated from the voltage value at this time and the resistance value of the high-precision resistor to obtain a calibration value (difference value between the current value reference value and the calculated value).

Japanese Unexamined Patent Publication No. 2004-45056 (page 4, FIG. 1)

  However, the current converter has the following problems. That is, in the above current converter, a magnetic field is generated by the current flowing in the connecting conductor connecting the terminal and the high-precision resistor and the current flowing in the conductor portion of the input terminal, and due to the influence of reactance due to the magnetic field, There is a risk of affecting the accuracy of work using the current converter (the calibration work described above). Further, in the above current converter, as described in FIG. 1 of the above-mentioned Patent Document 1, since the area of the loop surrounded by the current path constituted by the conductor portion of the connection conductor and the input terminal is large, When a magnetic field is generated, a lot of the magnetic field passes through the loop, and the current flowing through the current path is easily affected by the magnetic field. This may also affect the accuracy of work using the current transducer. There is.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a terminal unit and a resistance device that can reduce the influence of a current flowing in a current terminal and the influence of an external magnetic field.

  In order to achieve the above object, the terminal unit according to claim 1 is a first connected terminal for connecting a non-coaxial type current input terminal attached to a non-coaxial cable and a non-coaxial type cable. A terminal unit including a second connected terminal to which a coaxial type current output terminal is connected, wherein the first connected terminal has non-conductivity and the current input from an opening on one end side. A first cylindrical body into which a terminal for insertion can be inserted, and a first cylinder connected to the current input terminal that protrudes to the outside from the other end of the first cylindrical body and is inserted into the first cylindrical body. An electrode, and the second connected terminal has a non-conductive second cylindrical body into which the current output terminal can be inserted from the opening on one end side, and the second cylindrical body Connected to the current output terminal inserted into the second cylindrical body protruding outside from the other end side An outer peripheral surface of the first cylindrical body between the other end side and the one end side of the first cylindrical body in a state of being disconnected from the first electrode. A first conductor portion disposed along the second electrode, and the second tubular shape between the other end portion side and the one end portion side of the second tubular body in a state of being connected to the second electrode. A second conductor portion disposed along an outer peripheral surface of the body and spaced apart from the first conductor portion, and the first tubular body and the first tubular body on the one end side of the first tubular body. A conductor having one conductor portion and a third conductor portion connecting the second conductor portion is provided.

  The terminal unit according to claim 2 is the terminal unit according to claim 1, wherein the first conductor portion is formed with a first insertion portion into which the first connected terminal can be inserted from the base end side. A first cover part; a second cover part as the second conductor part formed with a second fitting part into which the second connected terminal can be fitted from the base end side; the first cover part; The cover as the conductor is formed integrally with the connecting portion as the third conductor portion that connects the base end sides of the two cover portions.

  According to a third aspect of the present invention, there is provided the terminal unit according to the second aspect, wherein a current input / output target for inputting / outputting current via the first connected terminal and the second connected terminal is fixed to the cover. Has been.

  A resistance device according to a fourth aspect includes the terminal unit according to the third aspect and a resistor as the current input / output target.

  According to the terminal unit of Claim 1, the 1st conductor part arrange | positioned along the outer peripheral surface of the 1st cylindrical body of a 1st to-be-connected terminal, and the 2nd cylindrical body of a 2nd to-be-connected terminal A second conductor portion disposed along the outer peripheral surface of the first conductor portion and spaced apart from the first conductor portion, and the first conductor portion and the second conductor portion on one end side of each of the first tubular body and the second tubular body. By providing a conductor having a third conductor portion for connecting the conductor portion, the current is supplied in a direction opposite to the direction of the current flowing through the current input terminal and the first electrode connected to the first connected terminal. The current can be passed through the second conductor portion in the direction opposite to the direction of the current flowing through the first conductor portion and flowing through the second electrode and the current output terminal. Therefore, according to this terminal unit, the magnetic fields generated by the currents flowing through the respective locations are canceled out, and the influence of these magnetic fields can be sufficiently reduced. Further, according to this terminal unit, the first conductor portion and the second conductor portion are arranged along the outer peripheral surfaces of the first cylindrical body and the second cylindrical body in the first connected terminal and the second connected terminal. The area of the loop surrounded by the current path constituted by the current input terminal, the first electrode, the first conductor portion, the third conductor portion, the second conductor portion, the second electrode, and the current output terminal. Can be kept small. Therefore, according to this terminal unit, it is possible to suppress the generation of a magnetic field from the current path, and to suppress the passage of the magnetic field generated around the terminal unit to the loop. Can be sufficiently reduced.

  According to the terminal unit of claim 2, the first cover part as the first conductor part, the second cover part as the second conductor part, and the connecting part as the third conductor part are integrally formed. By providing the cover as the conductor, the first cover part, the second cover part, and the connecting part can be attached only by covering the first connected terminal and the second connected terminal so as to cover the first connected terminal and the second connected terminal. it can. For this reason, according to this terminal unit, assembly efficiency can fully be improved.

  According to the terminal unit of claim 3, by fixing the current input / output target to the cover, for example, the first electrode of the first connected terminal is inserted into the insertion hole formed in the current input / output target. The first electrode and the current input / output target are connected by soldering, or a conductive pin is inserted through the insertion hole of the current input / output target and soldered in the state where it is inserted into the insertion hole of the cover part. The output target and the cover can be connected. For this reason, according to this terminal unit, the first electrode and the current input / output target are connected by wiring soldering, or the current input / output target and the cover are connected by wiring soldering. As a result, the assembly efficiency can be further improved.

  According to the resistance device of the fourth aspect, by providing the terminal unit, it is possible to achieve the same effect as that of the terminal unit.

1 is a perspective view of a resistance device 100. FIG. FIG. 5 is a perspective view of the resistance device 100 with a mounting surface 3c of the case 3 facing downward. 2 is an exploded perspective view of a resistance device 100. FIG. 2 is a cross-sectional view of the resistance device 100. FIG. 1 is a perspective view of a resistor 1. FIG. It is a perspective view of the banana jacks 41 and 43. FIG. 3 is a perspective view of a banana jack 42. FIG. 4 is a perspective view of a cover 44. FIG. It is the perspective view which looked at the cover 44 from the opening parts 81 and 91 side. It is the 1st explanatory view explaining the assembly method of resistance device 100. It is the 2nd explanatory view explaining the assembly method of resistance device 100. It is the 3rd explanatory view explaining the assembly method of resistance device 100. It is the 4th explanatory view explaining the assembly method of resistance device 100. It is explanatory drawing explaining the usage method (operation | movement of the resistor 1) of the resistance apparatus 100. FIG.

  Hereinafter, embodiments of a terminal unit and a resistance device will be described with reference to the accompanying drawings.

  First, the configuration of the resistance device 100 shown in FIG. 1 as an example of the resistance device will be described with reference to the drawings. The resistance device 100 is, for example, a device used for calibration of a resistance measurement device, and as shown in FIGS. 1 to 4, a resistor 1 (see FIGS. 3 and 4) and a terminal unit 2 (FIGS. 1 and 3). , 4) and a case 3. In FIG. 1, the banana jacks 41a, 41b, 42a, 42b, 43a, 43b (see FIGS. 1 and 3) in the terminal unit 2 are shown with the attachment surface 3c of the case 3 facing upward. -4, it has illustrated in the state which attached the surface 3c downward.

  The resistor 1 corresponds to a current input / output target, and includes a substrate 11 and a resistor 12 as shown in FIG. As an example, the substrate 11 is formed in a rectangular plate shape. Further, through holes 11a to 11d through which the electrodes 61 and 63 (see FIG. 3) of the terminal unit 2 are inserted in the substrate 11, through holes 11e to 11h through which pins 84 (see the same figure) described later are inserted, and resistors Insertion holes 11i and 11j are formed through which screws 1b (see FIG. 1) for fixing 1 are inserted. As shown in FIG. 5, the resistor 12 is disposed at the center of the substrate 11. In this case, in the resistance device 100, as shown in FIG. 4, the resistor 1 is accommodated in the case 3 while being fixed to the cover 44 of the terminal unit 2.

  As shown in FIG. 3, the terminal unit 2 has banana jacks 41a and 41b (hereinafter also referred to as “banana jack 41” when not distinguished) and banana jacks 42a and 42b (hereinafter referred to as “banana jack 42” when not distinguished). ), Banana jacks 43a and 43b (hereinafter also referred to as “banana jack 43” when not distinguished), and two covers 44.

  The banana jack 41 electrically connects a banana plug 202a (an example of a non-coaxial current input terminal) attached to the non-coaxial cable 201a shown in FIG. 14 (hereinafter referred to as electrical connection). Corresponding to a first connected terminal (also referred to simply as “connection”), as shown in FIG. 6, a cylindrical body 51 (corresponding to the first cylindrical body) and an electrode 61 (corresponding to the first electrode) are provided. Configured. The cylindrical body 51 has non-conductivity and is configured such that the banana plug 202a can be inserted from the opening on the one end 51b (lower end in the figure) side. Further, the cylindrical body 51 is configured such that a screw thread (not shown) is formed on the outer peripheral surface 51 a and a nut 51 d used when the banana jack 41 is attached to the case 3 can be screwed.

  As shown in FIG. 6, the electrode 61 is disposed on the other end 51 c of the cylindrical body 51 so as to protrude from the other end 51 c (upper end in the figure) side of the cylindrical body 51. ing. Moreover, the electrode 61 is connected to the banana plug 202a inserted in the cylindrical body 51, as shown in FIG. The electrode 61 is connected to a conductor pattern (not shown) on the substrate 11 and connected to the resistor 12 of the resistor 1 through the conductor pattern.

  The banana jack 42 corresponds to a second connected terminal for connecting a banana plug 202b (an example of a non-coaxial current output terminal) attached to the non-coaxial cable 201b shown in FIG. As shown, a cylindrical body 52 (corresponding to the second cylindrical body) and a screw 62 (corresponding to the second electrode) are provided. The cylindrical body 52 has non-conductivity and is configured such that the banana plug 202b can be inserted from the opening on the one end 52b (lower end in the figure) side. Further, a screw hole 52e into which the screw 62 is screwed is formed in the other end 52c (upper end in the drawing) of the cylindrical body 52. Further, the cylindrical body 52 is configured such that a screw thread is formed on the outer peripheral surface 52 a and a nut 52 d used when the banana jack 42 is attached to the case 3 can be screwed.

  The screw 62 also functions as a fixing screw when the cover 44 is fixed to the banana jack 42, and the other end 52c of the cylindrical body 52 is attached to the cylindrical body 52 as shown in FIG. Projects outward from the side. Moreover, the screw 62 is connected to the banana plug 202b inserted in the cylindrical body 52, as shown in FIG.

  The banana jack 43 detects the voltage across the resistor 12 when the measurement current Im (see FIG. 14) is supplied (input / output) to the resistor 12 of the resistor 1 via the banana jacks 41 and 42. This is a connected terminal to which a voltage detection terminal (banana plug) (not shown) is connected, and includes a cylindrical body 53 and an electrode 63 as shown in FIG. In this case, as shown in the figure, the cylindrical body 53 is formed in the same manner as the cylindrical body 51 of the banana jack 41, and the electrode 63 is formed in the same manner as the electrode 61 of the banana jack 41. The electrode 63 is connected to a conductor pattern (not shown) on the substrate 11 and is connected to the resistor 12 of the resistor 1 through the conductor pattern.

  The cover 44 corresponds to a conductor, and as shown in FIGS. 8 and 9, includes a first cover portion 71, a second cover portion 72, and a connecting portion 73, which are integrally formed. The cover 44 is formed of a conductive material (for example, aluminum), and is manufactured by cutting the conductive material as an example.

  As shown in FIGS. 8 and 9, the first cover portion 71 is formed in a rectangular parallelepiped shape (square column shape) as an example. Further, the first cover portion 71 has an opening on the base end portion 71a (lower end portion in FIG. 8) side of the banana jack 41 (specifically, a portion excluding one end portion 51b of the tubular body 51 in the banana jack 41). A first insertion portion D1 that can be inserted from the portion 81 is formed. Moreover, the opening part 82 which penetrates the electrode 61 of the banana jack 41 is formed in the front-end | tip part 71b of the 1st cover part 71, as shown in the figure. Further, an insertion hole 83 for inserting a pin 84 (see FIGS. 3 and 4) for connecting the conductor pattern (not shown) in the resistor 1 and the first cover portion 71 into the distal end portion 71 b of the first cover portion 71. Is formed. The first cover portion 71 functions as a first conductor portion, and as shown in FIG. 4, the tubular body 51 of the banana jack 41 is not connected (non-contacted) to the electrode 61 of the banana jack 41. Between the other end 51c and the one end 51b so as to be along the outer peripheral surface 51a of the cylindrical body 51.

  As shown in FIGS. 8 and 9, the second cover portion 72 is formed in a rectangular parallelepiped shape (square column shape) as an example. In addition, the second cover portion 72 is separated from the first cover portion 71 on the distal end portion 72 b side (a portion excluding the base end portion 72 a). In addition, the second cover portion 72 has an opening on the base end portion 72a (lower end portion in FIG. 8) side of the banana jack 42 (specifically, a portion excluding one end portion 52b of the cylindrical body 52 in the banana jack 42). A second insertion portion D2 that can be inserted from the portion 91 is formed. Further, as shown in the figure, an insertion hole 92 through which the screw 62 (FIGS. 3 and 4) of the banana jack 42 is inserted is formed in the distal end portion 72b of the second cover portion 72. In addition, a screw hole 93 into which the screw 1b (see both drawings) is screwed is formed in the distal end portion 72b of the second cover portion 72. The second cover portion 72 functions as a second conductor portion, and is connected to the screw 62 of the banana jack 42 and the other end portion 52c of the tubular body 52 of the banana jack 42 as shown in FIG. It arrange | positions so that the outer peripheral surface 52a of the cylindrical body 52 may be followed between the one end parts 52b.

  As shown in FIG. 8, the connecting portion 73 connects the base end portion 71 a of the first cover portion 71 and the base end portion 72 a of the second cover portion 72. This connection part 73 functions as a 3rd conductor part, and the 1st cover part 71 (1st conductor part) and 1st on the one end parts 51b and 52b side in each cylindrical body 51 and 52 of the banana jacks 41 and 42, respectively. 2 Connect the cover part 72 (second conductor part). That is, the connecting portion 73 connects only the base end portion 71 a of the first cover portion 71 and the base end portion 72 a of the second cover portion 72.

  As shown in FIG. 3, the case 3 includes a first case 3 a and a second case 3 b that can be divided, and is configured to accommodate the resistor 1 and the terminal unit 2. As shown in FIGS. 3 and 4, a plurality of attachment holes 3 d for attaching the banana jacks 41, 42, and 43 are formed in the attachment surface 3 c (the lower surface in both drawings) of the first case 3 a.

  Next, a method for assembling the terminal unit 2 and the resistance device 100 will be described with reference to the drawings.

  First, the banana jacks 41, 42, and 43 (see FIG. 3) are attached to the attachment surface 3c (see FIG. 3) of the first case 3a in the case 3. Specifically, each of the banana jacks 41, 42, and 43 in a state where the nuts 51d, 52d, and 53d (see FIGS. 6 and 7) are removed from the cylindrical bodies 51, 52, and 53 are formed on the attachment surface 3c. The nuts 51d, 52d, and 53d are inserted into the mounting holes 3d (see FIGS. 3 and 4), and the nuts 51d, 52d, and 53d are screwed into the outer peripheral surfaces 51a, 52a, and 53a of the cylindrical bodies 51, 52, and 53. 51, 52 and 53 are fixed. Thereby, the banana jacks 41, 42, and 43 are attached to the attachment surface 3c (see FIG. 4).

  Subsequently, two covers 44 (see FIG. 3) are attached. Specifically, as shown in FIG. 10, the cover 44 is covered so as to cover the other end portions 51c and 52c of the cylindrical bodies 51 and 52 in the banana jacks 41a and 42a. At this time, the banana jack 41a is inserted into the first insertion portion D1 from the opening 81 of the first cover portion 71 in the cover 44, and the banana is inserted into the second insertion portion D2 from the opening 91 of the second cover portion 72 in the cover 44. The jack 42a is inserted. In addition, illustration of case 3 is abbreviate | omitted in FIG. 10 and FIGS. 11-13 mentioned later.

  Next, as shown in FIGS. 10 to 12, the screw 62 is inserted through the insertion hole 92 formed in the second cover portion 72 of the cover 44, and subsequently, the other end portion 52 c of the cylindrical body 52 is formed. The screw 62 is screwed into the screw hole 52e (see FIG. 7). Thereby, as shown in FIGS. 11 and 12, the cover 44 is attached to the banana jacks 41a and 42a. Next, the cover 44 is attached to the banana jacks 41b and 42b in the same manner. As described above, the terminal unit 2 is assembled.

  Subsequently, the resistor 1 is attached. Specifically, as shown in FIG. 13, the spacer 1 a is placed on the covers 44, 44, and then the banana jack 41 is inserted into the insertion holes 11 a to 11 d (see FIG. 5) formed in the resistor 1. , 43, the resistor 1 is placed on the spacer 1a. At this time, the electrodes 61 and 63 are connected to a conductor pattern (not shown) formed on the resistor 1 and connected to the resistor 12 of the resistor 1 through the conductor pattern.

  Subsequently, as shown in FIG. 13, the pin 84 is inserted into the insertion holes 11 e to 11 h (see FIG. 5) formed in the resistor 1. At this time, the pin 84 is also inserted into the insertion hole 83 (see FIG. 11) formed in the first cover portion 71 of the cover 44. Thereby, the pin 84 is connected to a conductor pattern (not shown) connected to the resistor 12 of the resistor 1, and the first cover portion 71 of the cover 44 and the resistor 12 are connected via the pin 84 and the conductor pattern. Is done.

  Next, as shown in FIG. 13, the screw 1 b is inserted into the insertion holes 11 i and 11 j (see FIG. 5) formed in the resistor 1, and the screw hole 93 formed in the second cover portion 72 of the cover 44. The screw 1b is screwed into (see FIG. 11). Thereby, the resistor 1 is attached. Subsequently, as shown in FIG. 4, the second case 3 b is fitted into the first case 3 a and fixed with screws not shown. Thus, the assembly of the resistance device 100 is completed.

  In this case, the terminal unit 2 and the resistance device 100 have a function of reducing the influence of the current flowing through the banana jacks 41 and 42 and the influence of an external magnetic field (this function will be described in detail in the usage method described later). The cover 44 having the above can be mounted by the simple operation described above. Moreover, in this terminal unit 2 and the resistor device 100, since the banana jacks 41 and 43 and the cover 44 can be connected to the resistor 12 of the resistor 1 using the electrodes 61 and 63 and the pin 84, the resistor 1, The operation of soldering wiring to the banana jacks 41 and 43 and the cover 44 and connecting them can be omitted. Therefore, in the terminal unit 2 and the resistance device 100, the assembly efficiency of the terminal unit 2 and the resistance device 100 can be sufficiently improved.

  Next, how to use the resistance device 100 will be described with reference to the drawings. As an example, an example of calibrating a resistance measuring device (not shown) using the resistor 1 as a standard resistor will be described.

  First, as shown in FIG. 14, the banana plug 202 a attached to the non-coaxial cable 201 a that inputs the measurement current Im to the resistor 1 is removed from the opening of the tubular body 51 in the banana jack 41. Insert and connect to the electrode 61 of the banana jack 41. Further, as shown in the figure, a banana plug 202b attached to a non-coaxial cable 201b that outputs a measurement current Im is inserted from an opening of a tubular body 52 in the banana jack 42, and the banana jack 42 is inserted. The screw 62 is connected.

  Next, a voltage detection banana plug (not shown) connected to the voltage measurement cable is inserted from the opening of the cylindrical body 53 of the banana jack 43 and connected to the electrode 63 of the banana jack 43. Let

  Subsequently, output of a measurement current Im (for example, an alternating current) from the resistance measuring device is started. At this time, as shown in FIG. 14, the measurement current Im flows through a current path indicated by an arrow in the figure. In order to facilitate understanding of the invention, only the current paths for one banana jack 41, one banana jack 42, and one cover 44 are shown in FIG. Only the current path will be described.

  The above-described current path will be specifically described with reference to FIG. 14. The measurement current Im is input to the electrode 61 of the banana jack 41 in the terminal unit 2 through the cable 201a and the banana plug 202a. The measurement current Im input to the electrode 61 flows through the resistor 12 through a conductor pattern (not shown) in the resistor 1.

  Further, the measurement current Im flowing through the resistor 12 is input to the distal end portion 71 b of the first cover portion 71 of the cover 44 through a conductor pattern and a pin 84 (not shown). The measurement current Im input to the distal end portion 71 b flows toward the proximal end portion 71 a of the first cover portion 71, passes through the connecting portion 73, and is input to the proximal end portion 72 a of the second cover portion 72. Further, the measurement current Im input to the base end portion 72a flows toward the tip end portion 72b of the second cover portion 72, and flows through the screw 62 to the banana plug 202b and the cable 201b.

  On the other hand, the resistance measuring device detects the current value of the measurement current Im flowing through the current path. Further, the resistance measuring device inputs the voltage at both ends of the resistor 12 in a state where the measurement current Im flows through the banana jack 43 and the voltage measurement banana plug and cable, and the voltage of the voltage is input. Detect value. Next, the resistance measuring device measures the resistance value based on the detected current value and voltage value. In this case, the measured resistance value becomes the calibration value.

  Here, as shown in FIG. 14, the direction of the measurement current Im flowing through the electrode 61 of the banana plug 202a and the banana jack 42, and from the distal end portion 71b of the first cover portion 71 of the cover 44 toward the proximal end portion 71a. The direction of the flowing measurement current Im is opposite. Further, the direction of the measurement current Im flowing from the base end portion 72a to the tip end portion 72b in the second cover portion 72 of the cover 44 and the direction of the measurement current Im flowing through the screw 62 and the banana plug 202b of the banana jack 42 Is reversed. For this reason, in this terminal unit 2, the magnetic field generated by the measurement current Im flowing through the banana plug 202 a and the electrode 61 and the magnetic field generated by the measurement current Im flowing through the first cover portion 71 are canceled out, and the second cover portion 72. As a result of canceling out the magnetic field generated by the measurement current Im flowing through the screw 62 and the measurement current Im flowing through the banana plug 202b, the magnetic field generated by the measurement current Im flowing through the banana jacks 41, 42, etc. It is possible to suppress the influence on the detection of the current value and the voltage value (measurement of the calibration value).

  As shown in FIG. 14, in this terminal unit 2, the first cover portion 71 and the second cover portion 72 of the cover 44 extend along the outer peripheral surfaces 51 a and 52 a of the cylindrical bodies 51 and 52 of the banana jacks 41 and 42. Arranged. Therefore, the banana plug 202a inserted into the banana jack 41, the electrode 61 of the banana jack 42, the first cover portion 71, the connecting portion 73, the second cover portion 72, the screw 62 of the banana jack 42, and the banana plug 202b are configured. The area of the loop surrounded by the current path can be reduced. For this reason, in this terminal unit 2, generation | occurrence | production of the magnetic field from this electric current path | route can be suppressed little, and when the magnetic field has generate | occur | produced around the terminal unit 2 (resistor apparatus 100), the magnetic field which passes a loop As a result, the influence of these magnetic fields on the detection of current values and voltage values (measurement of calibration values) can be kept low.

  Thus, according to the terminal unit 2 and the resistance device 100, the first cover portion 71 (first conductor portion) disposed along the outer peripheral surface 51a of the tubular body 51 of the banana jack 41, the banana A second cover portion 72 (second conductor portion) disposed along the outer peripheral surface 52 a of the cylindrical body 52 of the jack 42 and spaced from the first cover portion 71, and each of the cylindrical bodies 51 and 52. Connected to the banana jack 41 by providing the cover 44 (conductor) having the connecting portion 73 (third conductor portion) connecting the first cover portion 71 and the second cover portion 72 on the one end portions 51b and 52b side. The measurement current Im flows through the first cover portion 71 in the direction opposite to the direction of the measurement current Im flowing through the banana plug 202a and the electrode 61, and the measurement current flowing through the screw 62 and the banana plug 202b. The Im orientation can flow measuring current Im in the second cover portion 72 in the opposite direction. Therefore, according to the terminal unit 2 and the resistance device 100, the magnetic fields generated by the measurement current Im flowing through the respective locations are canceled out, and the influence of these magnetic fields can be sufficiently reduced. Further, according to the terminal unit 2 and the resistance device 100, the first cover portion 71 and the second cover portion 72 are disposed along the outer peripheral surfaces 51 a and 52 a of the cylindrical bodies 51 and 52 of the banana jacks 41 and 42. Therefore, the area of the loop surrounded by the current path constituted by the banana plug 202a, the electrode 61, the first cover portion 71, the connecting portion 73, the second cover portion 72, the screw 62, and the banana plug 202b can be kept small. it can. Therefore, according to the terminal unit 2 and the resistance device 100, it is possible to suppress the generation of a magnetic field from the current path and to suppress the passage of the magnetic field generated around the terminal unit 2 to the loop. As a result, the influence of these magnetic fields can be sufficiently reduced.

  Further, according to the terminal unit 2 and the resistance device 100, the banana jacks 41 and 42 are covered by including the cover 44 in which the first cover portion 71, the second cover portion 72, and the connecting portion 73 are integrally formed. Thus, the first cover portion 71 as the first conductor portion, the second cover portion 72 as the second conductor portion, and the connecting portion 73 as the third conductor portion can be mounted simply by covering the cover 44. . For this reason, according to this terminal unit 2 and the resistance apparatus 100, the assembly efficiency of the terminal unit 2 can fully be improved.

  Further, according to the terminal unit 2 and the resistance device 100, the resistor 1 is fixed to the cover 44, so that the electrode 61 of the banana jack 41 is inserted into the insertion holes 11a and 11d of the resistor 1 and soldered. 61 and the resistor 1 are connected, or the pin 84 is inserted into the insertion holes 11e to 11h of the resistor 1 and soldered in a state where the pin 84 is inserted into the insertion hole 83 of the cover 44 (first cover portion 71). The device 1 and the cover 44 can be connected. Therefore, according to the terminal unit 2 and the resistor device 100, the electrode 61 and the resistor 1 are connected by cable soldering, or the resistor 1 and the cover 44 are connected by cable soldering. As a result, the assembly efficiency can be further improved.

  In addition, the structure of a terminal unit and a resistance apparatus is not limited to said structure. For example, although the example provided with the cover 44 as the conductor has been described above, the metal foil as the first conductor portion is disposed (attached) on the outer peripheral surface 51a of the cylindrical body 51 in the banana jack 41, and the first conductor The metal foil as the second conductor portion is disposed (attached) on the outer peripheral surface 52a of the cylindrical body 52 in the banana jack 42 in a state of being separated from the metal foil as the portion, and one end of each of the cylindrical bodies 51 and 52 The structure which connects each metal foil (1st conductor part and 2nd conductor part) in the 51b and 52b side with the metal foil and metal piece as a 3rd conductor part, ie, the conductor comprised with these metal foil and metal piece Can also be adopted.

  Further, the example in which the banana jacks 41 and 42 and the cover 44 are each applied to the terminal unit 2 has been described above. However, the terminal unit including only one banana jack 41 and 42 and the cover 44, or the banana jack 41, respectively. , 42 and the cover 44 can be applied to a terminal unit having three or more.

  Moreover, although the example using the banana jacks 41 and 42 for connecting the banana plugs 202a and 202b as non-coaxial terminals as the first connected terminal and the second connected terminal has been described above, the RCA as the non-coaxial terminal is described. It is also possible to employ a configuration in which connected terminals to which terminals and clip-type terminals are connected are used as the first connected terminal and the second connected terminal.

  Further, although the example in which the resistor 1 is fixed to the cover 44 has been described above, a configuration in which the resistor 1 is fixed to a portion other than the cover 44 (for example, the case 3) may be employed. In addition, the example in which the plate-shaped (substrate type) resistor 1 as the current input / output target is provided has been described above, but the current input / output target is not limited thereto, and for example, a cylindrical or columnar resistor is provided. A configuration can also be adopted.

  In addition to the banana jacks 41, 42, 43, a terminal unit including a connected terminal (for example, a BNC receptacle) for connecting a coaxial terminal (for example, a BNC terminal) attached to a coaxial cable, It can also be applied to a resistance device provided with a terminal unit.

DESCRIPTION OF SYMBOLS 1 Resistor 2 Terminal unit 41a, 41b, 42a, 42b Banana jack 44 Cover 51, 52 Cylindrical body 51a, 52a Outer peripheral surface 51b, 52b One end part 51c, 52c The other end part 61 Electrode 62 Screw 71 First cover part 72 1st 2 Cover part 71b, 72b Tip part 71a, 72a Base end part 73 Connection part 100 Resistance device 201a, 201b Cable 202a, 202b Banana plug D1 1st insertion part D2 2nd insertion part

Claims (4)

A first connected terminal for connecting a non-coaxial current input terminal attached to a non-coaxial cable and a second connected terminal for connecting a non-coaxial current output terminal attached to the non-coaxial cable. A terminal unit comprising:
The first connected terminal includes a first tubular body that is non-conductive and into which the current input terminal can be inserted from an opening on one end side, and from the other end side of the first tubular body. A first electrode connected to the current input terminal protruding outside and inserted into the first cylindrical body;
The second connected terminal includes a second cylindrical body that is non-conductive and into which the current output terminal can be inserted from an opening on one end side, and from the other end side of the second cylindrical body. A second electrode connected to the current output terminal that protrudes to the outside and is inserted into the second cylindrical body,
The first cylindrical body is arranged along the outer peripheral surface of the first cylindrical body between the other end side and the one end side in a state of being disconnected from the first electrode. Along the outer peripheral surface of the second tubular body between the other end portion side and the one end portion side of the second tubular body in a state of being connected to the first conductor portion and the second electrode, and A second conductor portion disposed in a state of being separated from the first conductor portion, and the first conductor portion and the second conductor on the one end side of each of the first tubular body and the second tubular body. A terminal unit comprising a conductor having a third conductor portion connecting the portions.   A first cover portion as the first conductor portion formed with a first insertion portion into which the first connected terminal can be inserted from the proximal end side, and the second connected terminal can be inserted from the proximal end portion side. A second cover part as the second conductor part in which a second fitting part is formed, and the third conductor part connecting the base end sides of the first cover part and the second cover part. The terminal unit according to claim 1, further comprising a cover serving as the conductor integrally formed with a connecting portion.   The terminal unit according to claim 2, wherein a current input / output target for inputting / outputting current via the first connected terminal and the second connected terminal is fixed to the cover.   A resistance device comprising the terminal unit according to claim 3 and a resistor as the current input / output target.

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