JP2017009576A5 - - Google Patents

Description

The voltage detection probe according to claim 2 is the voltage detection probe according to claim 1, wherein the notch surface located on the tip end side of the notch surface of the shield cylinder constituting the insertion recess is The base plate is inclined toward the base end side of the shield cylinder with reference to a reference plane orthogonal to the axis.

Measurement device according to claim 11 includes a voltage detection probe according to any one of claims 1 to 10, and the main body unit of the voltage detecting probe is connected, is disposed within the main unit, before Symbol Detection A voltage detection unit that detects a voltage of the measurement target electric wire via an electrode and outputs a voltage signal that changes in accordance with the voltage; and the measurement target that is disposed in the main body unit based on the voltage signal A voltage generation unit that generates a voltage that follows the voltage of the electric wire and that is applied to the shield cylinder, and the measurement target that is disposed in the main body unit and is generated in the voltage generation unit A processing unit that measures the voltage of the electric wire, and the voltage detection unit operates with a floating voltage based on the potential of the voltage generated by the voltage generation unit.
In the measurement device according to claim 12, a shield cable is connected, a shield conductor of the shield cable is electrically connected to the shield cylinder, and a core wire of the shield cable is electrically connected to the detection electrode. The voltage detection probe according to any one of claims 1 to 10, a main unit to which the voltage detection probe is connected via the shielded cable, and the core wire and the main unit disposed in the main unit. A voltage detection unit that detects a voltage of the measurement target electric wire via a detection electrode and outputs a voltage signal that changes in accordance with the voltage, and is disposed in the main unit, and the measurement is performed based on the voltage signal. A voltage generator that generates a voltage that follows the voltage of the target wire and that is applied to the shield cylinder via the shield conductor; A processing unit disposed in the main unit and measuring the voltage of the measurement target wire based on the voltage generated by the voltage generation unit, and the voltage detection unit is generated by the voltage generation unit It operates with a floating voltage based on the potential of the voltage.
The measurement apparatus according to claim 13 is the measurement apparatus according to claim 12, wherein the voltage detection unit includes a current-voltage conversion circuit configured to include an operational amplifier, and the operational amplifier has an inverting input terminal as the inverting input terminal. While being electrically connected to the detection electrode via a core wire, a non-inverting input terminal is defined by the potential of the voltage generated by the voltage generation unit.

As shown in FIGS. 3 and 5, the first shield cylinder 21 is made of a cylindrical rigid body having a diameter of about 3 mm to 5 mm as an example using a conductive material (a metal material having conductivity). As a cylindrical body), and the tip portion (the left end portion in FIGS. 2 to 6) has a direction in which a part of the outer peripheral wall at the tip portion intersects the axis L (in this example, orthogonal) The insertion recess 33 into which the measurement target electric wire 6 (see FIGS. 4, 6, and 8) is inserted is formed along a cutting direction by a method such as cutting. As shown in FIGS. 2 to 6, the first shield cylinder 21 has a base end portion (right end portion in FIGS. 2 to 6) accommodated in the grip portion 2, and the grip portion as will be described later. 2 is also housed in the second shield cylinder 22 housed in the housing 2 . In addition, as shown in FIG. 8, the measurement target electric wire 6 in this example is a covered electric wire in which the core wire 6a is covered with an insulating coating 6b.

In the current-voltage conversion circuit 53a, as an example, the non-inverting input terminal is connected to a portion defined by the second reference potential G2 in the voltage detection unit 53 via a resistor (hereinafter also referred to as “connected to the second reference potential G2”). ) And the inverting input terminal is connected to the core wire 5a of the shielded cable 5 (that is, the detection electrode 23 of the detection probe 1 through the core wire 5a ), and the feedback resistor is connected between the inverting input terminal and the output terminal. The first operational amplifier is connected. In the current-voltage conversion circuit 53a, the first operational amplifier operates with the positive voltage Vf + and the negative voltage Vf−, and the voltage V1 of the measurement target wire 6 and the second reference potential G2 (the voltage signal output from the voltage generation unit 55). The detection current (current signal) I flowing between the measurement target wire 6 and the detection electrode 23 at a current value corresponding to the potential difference Vdi due to the potential difference Vdi (refer to FIG. 9). It converts into detection voltage signal V2 and outputs it. In this case, the amplitude of the detection voltage signal V2 changes in proportion to the amplitude of the current signal I.

Claims (13)

An insertion recess that is formed of a cylindrical body made of a conductive material and in which a part of the outer peripheral wall at the tip is cut out along the direction intersecting the axis and into which the measurement target electric wire can be inserted is formed at the tip. A formed shield cylinder;
The front end surface and the outer peripheral surface are formed of a columnar body made of a conductive material covered with an insulating coating, and are housed in the shield cylinder so as to be movable relative to the shield cylinder along the axial direction. A detection electrode,
When the detection electrode is moved relative to the shield cylinder and the tip surface is positioned in the insertion recess, the measurement target electric wire and the insulation coating in a state of being inserted in the insertion recess A voltage detection probe in which the distal end surface is configured to be capable of capacitive coupling via a pin. Of the cut-out surfaces of the shield cylinder that constitute the insertion recess, the front-end notch surface located on the front end side is a base end side of the shield cylinder with reference to a reference plane orthogonal to the axis. The voltage detection probe according to claim 1, wherein the voltage detection probe is inclined toward the surface.   Of the cut-out surfaces of the shield cylindrical body constituting the insertion recess, a base-side cut-out surface located on the base end side is more than the base-side cut-out surface with respect to the reference plane. The voltage detection probe according to claim 2, wherein the voltage detection probe is inclined toward the end side. A biasing member that constantly biases the detection electrode in the direction of the insertion recess;
The detection electrode is slid in the direction of the insertion recess in the shield cylinder by the biasing force of the biasing member, and is on the tip end side of the cutout surface of the shield cylinder that constitutes the insertion recess. The voltage detection probe according to any one of claims 1 to 3, wherein the measurement target electric wire inserted into the insertion recess is sandwiched between a front end side notch surface located at the front end and the front end surface.   5. The voltage detection probe according to claim 1, wherein the tip surface is inclined toward the tip portion with reference to a reference plane orthogonal to the axis.   Between the detection electrode and the shield cylinder, the outer peripheral surface of the detection electrode exposed from the insertion recess to the outside of the shield cylinder is covered in a capacitive coupling state between the measurement target electric wire and the tip surface. The voltage detection probe according to any one of claims 1 to 5, wherein a shield material for a detection electrode made of a conductive material that further covers the insulating coating is disposed.   The voltage detection probe according to claim 6, wherein the detection electrode shield member is formed of a cylindrical body.   The voltage detection probe according to claim 6, wherein the detection electrode shielding material is formed of a conductor layer formed on a surface of the insulating coating.   The insulating coating that covers the outer peripheral surface of the detection electrode that is exposed from the insertion recess to the outside of the shield cylinder in a capacitive coupling state between the measurement target electric wire and the tip surface is further provided on the outer side of the shield cylinder. The voltage detection probe according to claim 1, wherein a shielding material for a detection electrode made of a conductive material is disposed.   In the capacitively coupled state, the detection electrode shield material is in a state in which the distal end portion of the detection electrode shield material is flush with the distal end surface of the detection electrode, and the distal end portion is closer to the axial direction than the distal end surface. The voltage detection probe according to any one of claims 6 to 9, wherein the voltage detection probe is configured to be in any of the states positioned on the proximal end side of the shield cylinder. A voltage detection probe according to any one of claims 1 to 10,
A main unit to which the voltage detection probe is connected;
Disposed within said main body unit, a voltage detection unit that outputs a voltage signal that changes according to the voltage while before Symbol detects the voltage of the measurement target wire through the detection electrode,
A voltage generator disposed in the main body unit and generating a voltage that follows the voltage of the measurement target wire based on the voltage signal and applied to the shield cylinder;
A processing unit disposed in the main unit and measuring the voltage of the measurement target wire based on the voltage generated by the voltage generation unit;
The voltage detector is a measuring device that operates with a floating voltage based on the potential of the voltage generated by the voltage generator. The shield cable is connected, the shield conductor of the shield cable is electrically connected to the shield cylinder, and the core wire of the shield cable is electrically connected to the detection electrode. A voltage detection probe according to
A main unit to which the voltage detection probe is connected via the shielded cable;
A voltage detection unit disposed in the main body unit for detecting a voltage of the measurement target electric wire via the core wire and the detection electrode and outputting a voltage signal that changes in accordance with the voltage;
A voltage generating unit disposed in the main body unit and generating a voltage that follows the voltage of the measurement target electric wire based on the voltage signal and applied to the shield cylindrical body through the shield conductor;
A processing unit disposed in the main unit and measuring the voltage of the measurement target wire based on the voltage generated by the voltage generation unit;
The voltage detector is a measuring device that operates with a floating voltage based on the potential of the voltage generated by the voltage generator. The voltage detection unit has a current-voltage conversion circuit configured with an operational amplifier,
The operational amplifier has an inverting input terminal electrically connected to the detection electrode through the core wire, and a non-inverting input terminal defined by the potential of the voltage generated by the voltage generation unit. Item 13. The measuring device according to Item 12.