JPH0220699Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to the structure of input leads used in various electrical measuring instruments.

Prior Art As is well known, in precise electrical value measurement,
To prevent electrical noise from being input from the measurement lead wire, the measurement lead wire can be constructed with a shielded wire and the outer conductor of the shielded wire can be electrically grounded. Both ends are connected to the input terminal of the measuring instrument or the measurement point.
It requires a fairly flexible and flexible structure. For this reason, conventionally, the proximal end 1a and the distal end 1b of the measurement lead wire indicated by reference numeral 1 are connected to both ends 2a and 2b of the outer sheath conductor 2 for easy handling.
fully pull it out and connect it to the terminal plug 3A and test pin 4A, and connect both ends 2 of the outer sheath conductor 2.
Two ground side lead wires 5 with terminal plugs 3B and test pins 4B attached to a and 2b.
A and 5B are connected. However, with such conventional measurement leads, although the degree of freedom of the terminal plugs 3A, 3B and test pins 4A, 4B can be secured, both ends 1a, 1 of the measurement lead wire 1 can be secured.
b includes areas α, which are not protected by the outer conductor;
Since β is formed, external noise may be input from these areas α and β and cause measurement errors.

For this reason, recently, the measurement lead wire is divided into two wires, one on the terminal plug side 1A and one on the test pin side 1B, and the adjacent ends 2c of the outer conductors of both lead wires 1A and 1B are connected to one end 6a of the jumper wire 6. A measurement lead structure shown in the second figure coupled together is proposed.
That is, in this structure, the other end 6b of the jumper wire 6
is connected to two ground side lead wires which are also divided into a terminal plug side 5A and a test pin side 5B, and these connecting portions and the jumper wire 6 are embedded in a cable branch 7 made of insulating resin. However, according to this structure, the core wire connection part a and the outer conductor connection part b of the divided shielded wire are close to each other, resulting in a decrease in dielectric strength voltage and insulation resistance, and not only a portion that cannot be shielded, but also a portion inside the cable branch 7. This increases the number of connection points by 3 points,
The drawbacks were that the manufacturing process became complicated and reliability deteriorated.

Purpose of the invention In view of the problems of conventional measurement leads as described above, the purpose of the invention is to obtain a measurement lead structure that is as simple as possible, does not increase the number of connection points, and is highly flexible. be.

Structure of the Device In order to achieve this object, the present invention provides a measurement lead wire consisting of a pair of grounding side lead wires and a measuring side lead wire, which are connected to a terminal plug and a test pin on both sides. consists of a single shielded wire, one end of the jumper wire is connected to the outer conductor at the end of the terminal plug side of the measurement lead wire, and the middle part of the jumper wire is connected to the cable branch that fixes the middle part of both lead wires. It is proposed that the other end of the jumper wire be folded back into a "U" shape and that the other end of the jumper wire be connected to the terminal plug together with the grounding lead wire.

Embodiment Hereinafter, details of an embodiment of the present invention will be explained with reference to FIG.

The illustrated measuring lead of the present invention includes a measuring lead wire 1 and a grounding lead wire 5 each composed of a single shielded wire and a multi-core wire, and an outer sheath conductor 2 coated on the outer circumference of the measuring lead wire 1. The jumper wire 8 has both ends connected to the terminal plug side end 2d of the grounding lead wire 5 and the terminal plug 3B of the grounding lead wire 5. That is, the terminal plug side end 8a of the jumper wire 8 may be connected to the terminal plug 3B together with the corresponding end of the ground side lead wire 5 by soldering or the like, so there is no need to increase the number of special connection points. Further, the intermediate portion 8b of the coated jumper wire 8 is fixed to a cable branch 7 made of resin that integrates the intermediate portion of the measurement lead wire 1 and the intermediate portion of the grounding lead wire 5. In addition, in FIG. 3, symbols 9A and 9B
indicates a plug housing, and 10A and 10B indicate test pin holders, respectively.

Effects of the invention As is clear from the following explanation, the measurement lead of the invention is composed of a total of three coated wires, so it has a highly reliable structure with extremely few connection points, and the number of manufacturing steps is also reduced. There are advantages in that a structure with high withstand voltage and insulation resistance can be obtained, and both ends of the measurement lead wire and the grounding lead wire can be moved to any position using the cable branch as a fulcrum.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional measurement lead, FIG. 2 is a sectional view of another conventional measurement lead, and FIG. 3 is a sectional view of a measurement lead according to the present invention. 1, 1A, 1B...Measurement lead wire, 2...
Outer conductor (of shielded wire), 3A, 3B...terminal plug, 4A, 4B...test pin, 7...
...Cable branch, 8... Jumper line.

Claims (1)

[Scope of utility model registration request] In a measurement lead consisting of a pair of grounding side lead wire and measurement side lead wire that are connected on both sides to a terminal plug and a test pin, the measurement lead wire is composed of one shielded wire and the measurement lead wire is Connect one end of the jumper wire to the outer conductor at the end of the terminal plug side, and use the cable branch that fixes the middle part of both lead wires to fold the middle part of the jumper wire into a "U" shape and attach the other end of the jumper wire. A measurement lead wire characterized in that it is connected to a terminal plug together with a grounding lead wire.