JP5851567B1 - Measuring device protection device and measuring device protection method - Google Patents

Abstract

A measuring instrument protection device and a measuring instrument protection method capable of completely discharging static electricity charged between a central conductor and an outer conductor. When a coaxial cable connector is brought into contact with a gate portion, the center conductor contact portion is contacted by the center conductor before the contact between the outer conductor and the outer conductor contact portion. It is formed so as to be in contact with the portion 13, and is formed so as to be pushed in the advancing direction of the connector 50 of the coaxial cable by the pressure with which the central conductor 51 comes into contact. After being formed, the outer conductor 52 and the outer conductor contact portion 13 are formed in contact with each other while maintaining the contact between the center conductor 51 and the center conductor contact portion 13, and the gate is formed by the pressure accompanying the progress of the connector 50 of the coaxial cable. The part 11 is rotated. [Selection] Figure 1

Description

  The present invention relates to a measuring instrument protection device and a measuring instrument protection method for protecting a measuring instrument from ESD (Electrostatic Discharge) and AC leakage.

  The measuring instrument in the present invention is an apparatus that inputs an electrical signal output from a device under test and evaluates its characteristics. For example, an error rate measuring device that inputs a digital signal having a predetermined pulse pattern to the device under test and measures the error rate of the digital signal output through the device under test, or an electrical signal output from the device under test An oscilloscope or the like that displays the time-axis waveform of the above is mentioned. The measuring instrument according to the present invention includes a pulse pattern generator that generates a digital signal having a predetermined pulse pattern for the object to be measured, and a signal generator that transmits a desired high-frequency signal to the object to be measured. It is done.

  By the way, static electricity may be charged between the central conductor and the outer conductor of the coaxial cable used when connecting the device under test to the measuring instrument, and it is used for the input / output part of the measuring instrument due to the high voltage of the static electricity. There is a problem that the semiconductor device is destroyed and the measuring instrument becomes unusable.

  The input / output unit of the measuring instrument is a part that handles a high frequency of, for example, several hundred MHz to several tens GHz, and depending on the measuring instrument, not only amplitude characteristics but also phase characteristics and group delay characteristics are emphasized. For this reason, for example, when a semiconductor device is protected by a protection circuit composed of a diode, the characteristics of the measuring instrument may be deteriorated due to the nonlinearity of the diode or the presence of parasitic capacitance inside the device. Is not easy. Therefore, in many cases, the input / output unit of the measuring instrument must be defenseless against static electricity. Thus, as an apparatus for protecting against electrostatic discharge before a coaxial cable is connected to the input / output unit, for example, an electrostatic discharge protection apparatus as disclosed in Patent Document 1 is known.

JP 2001-23792 A

  By the way, in the electrostatic discharge protection device of Patent Document 1, first, the central conductor of the coaxial cable comes into contact with the raised target area, and when the coaxial cable is further advanced, the central conductor once leaves the target area, and then the outer conductor It comes in contact with the target area. Therefore, since the central conductor of the coaxial cable is first grounded, the static electricity charged in the central conductor can be discharged.

  However, in the configuration of Patent Document 1, in the process of advancing the coaxial cable, after the central conductor of the coaxial cable is first grounded by the target area, the central conductor is once separated from the target area and then the outer conductor is then moved to the target area. To come into contact. That is, in the configuration of Patent Document 1, before the outer conductor comes into contact with the target area, the central conductor leaves the contact state with the target area, and the static electricity charged between the central conductor and the outer conductor is completely discharged. However, there is a problem in that the semiconductor device used in the input / output unit of the measuring instrument may be destroyed and the measuring instrument may become unusable.

  Accordingly, the present invention has been made in view of the above problems, and provides a measuring instrument protection device and a measuring instrument protection method capable of completely discharging static electricity charged between a central conductor and an outer conductor. It is the purpose.

In order to achieve the above-described object, the measuring instrument protection device according to claim 1 is a measuring instrument (100) to which a connector (50) of a coaxial cable having a center conductor (51) and an outer conductor (52) can be connected. ) Measuring device protection device (1),
A gate support (10) electrically connected to the ground of the measuring instrument;
It is electrically connected to the gate support and is provided at a position that prevents the coaxial cable connector from advancing to the connector (60) provided on the measuring instrument. A moving gate part (11),
The gate part is
A central conductor contact portion (12) electrically connected to the gate portion for contacting the central conductor;
An outer conductor contact portion (13) electrically connected to the gate portion and for contacting the outer conductor;
The center conductor contact portion contacts the center conductor contact portion before the contact between the outer conductor and the outer conductor contact portion when the coaxial cable connector is brought into contact with the gate portion. Formed so as to be pushed in the direction of travel of the connector of the coaxial cable by the pressure with which the central conductor contacts,
The gate portion is formed such that the outer conductor and the outer conductor contact portion are in contact with each other while maintaining the contact between the center conductor and the center conductor contact portion after the center conductor contact portion is pressed,
The connector of the coaxial cable can be connected to the connector provided in the measuring instrument by rotating the gate portion by the pressure accompanying the progress of the connector of the coaxial cable.

  The measuring device protection device according to claim 2 is characterized in that, in the measuring device protection device (1) according to claim 1, a depression (12a) larger than the diameter of the central conductor is provided at the top of the central conductor contact portion. And

The measuring instrument protection device according to claim 3 is the measuring instrument protection device (1) according to any one of claims 1 and 2.
A center conductor contact portion movable mechanism (12b) formed so that a member of the center conductor contact portion stored in the gate portion can slide back and forth with respect to the traveling direction of the connector of the coaxial cable;
A center conductor contact portion spring (12c) provided between the center conductor contact portion and the gate portion, which applies pressure in a direction repelling the progress of the connector of the coaxial cable to the member of the center conductor contact portion; Thus, the center conductor contact portion is pushed down in the traveling direction of the connector of the coaxial cable by the pressure with which the center conductor contacts.

In order to achieve the above object, the measuring instrument protection method according to claim 4 is a measuring instrument (100) capable of connecting a connector (50) of a coaxial cable having a center conductor (51) and an outer conductor (52). ) Measuring instrument protection method,
A gate support (10) electrically connected to the ground of the measuring instrument;
It is electrically connected to the gate support and is provided at a position that prevents the coaxial cable connector from advancing to the connector (60) provided on the measuring instrument. A moving gate part (11),
The gate part is
A central conductor contact portion (12) electrically connected to the gate portion for contacting the central conductor;
An outer conductor contact portion (13) electrically connected to the gate portion and for contacting the outer conductor;
When the connector of the coaxial cable is brought into contact with the gate portion, the step of contacting the center conductor with the center conductor contact portion before the contact between the outer conductor and the outer conductor contact portion (S201);
The center conductor contact portion is pushed down in the direction of travel of the connector of the coaxial cable by the pressure with which the center conductor contacts (S203);
The outer conductor and the outer conductor contact portion are in contact with each other while maintaining the contact between the center conductor and the center conductor contact portion (S204);
Including a step (S205) of enabling the connection of the connector of the coaxial cable to the connector provided in the measuring instrument by rotating the gate portion by the pressure accompanying the progress of the connector of the coaxial cable. It is characterized by.

The measuring instrument protection method according to claim 5 is the measuring instrument protection method according to claim 4, wherein a recess (12a) larger than the diameter of the central conductor is provided at the top of the central conductor contact portion. ,
After the center conductor comes into contact with the center conductor contact portion, the front end of the center conductor is fitted into the recess, and the contact between the center conductor and the center conductor contact portion is maintained (S202). It is characterized by that.

  According to the measuring instrument protection device of the present invention, the center conductor 51 and the outer conductor 52 are electrically short-circuited, and the outer conductor 52 is grounded to the ground of the measuring instrument 100 so that discharge is performed. Static electricity charged between the center conductor and the outer conductor can be completely discharged. For this reason, it is possible to completely eliminate the possibility that the semiconductor element used in the input / output part of the measuring instrument will be destroyed and the measuring instrument becomes unusable. Time can be eliminated, and the burden on the user can be reduced.

  Further, according to the measuring instrument protection device of the present invention, since the recess portion larger than the diameter of the center conductor is provided at the top of the center conductor contact portion, the center conductor contact portion is fitted by fitting the tip of the center conductor into the recess portion. After the center conductor contact portion is pushed down by the progress of the coaxial cable connector, the outer conductor and the outer conductor contact portion are brought into contact with each other while maintaining the contact between the center conductor and the center conductor contact portion completely. Is possible. As a result, it is possible to completely eliminate the possibility that the semiconductor element used in the input / output unit of the measuring instrument is destroyed and the measuring instrument becomes unusable.

It is the schematic which shows the apparatus structure of the measuring device protection apparatus which concerns on this invention. It is the schematic which shows an example of operation | movement of the measuring device protection apparatus which concerns on this invention. It is the schematic which shows an example of operation | movement of the measuring device protection apparatus which concerns on this invention. It is the schematic which shows an example of operation | movement of the measuring device protection apparatus which concerns on this invention. It is a flowchart which shows an example of operation | movement of the apparatus.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited by this embodiment, and all other forms, examples, operational techniques, etc. that can be implemented by those skilled in the art based on this form are included in the scope of the present invention. .

  First, the apparatus configuration of the measuring instrument protection apparatus according to the present invention will be described with reference to FIG. As an example of the measuring device 100, the measuring device protection apparatus 1 of this example inputs a digital signal having a predetermined pulse pattern to the device under test and measures the error rate of the digital signal output through the device under test. It is provided in the vicinity of an input terminal of an error rate measuring device or an oscilloscope for displaying a time axis waveform of an electric signal output from a device under test. In addition, the measuring instrument protection device 1 of this example transmits, for example, a pulse pattern generation device that generates a digital signal having a predetermined pulse pattern to the device under test or a desired high-frequency signal to the device under test. It is provided in the vicinity of an output terminal of a signal generator or the like.

  As shown in FIG. 1, the measuring instrument protection apparatus 1 of this example includes a gate support portion 10, a gate portion 11, a gate portion movable mechanism 11a, a stopper means 11b, a gate portion spring 11c, a center conductor contact portion 12, and a recess portion 12a. The center conductor contact part movable mechanism 12b, the center conductor contact part spring 12c, and the outer conductor contact part 13 are provided. The coaxial cable-side connector 50 includes a center conductor 51 and an outer conductor 52, and the measuring instrument 100 includes a measuring instrument-side connector 60.

  The gate support unit 10 is electrically connected to the ground of the measuring device 100. Specifically, the gate support unit 10 is manufactured by processing a conductive material or a metal-processed plate or bar, and the gate support unit 10 is electrically connected to the chassis of the measuring instrument 100 by screwing or the like. And is configured to have the same potential as the ground of the measuring instrument 100. The length of the gate support portion 10 from the measuring device 100 to the gate portion 11 is preferably about several centimeters to about 10 centimeters, for example. This is a length in consideration of workability for attaching / detaching a screw portion (not shown) constituting the outer conductor 52 of the connector 50 when the connector 50 of the coaxial cable is connected to the measuring instrument 100.

  The gate portion 11 is electrically connected to the gate support portion 10 and is configured to be rotated by a pressure that abuts the connector 50 of the coaxial cable. Specifically, the gate portion 11 is manufactured by processing a conductive material or a plate or bar processed from a metal. Moreover, in order to make it rotate with respect to the gate support part 10, the gate part movable mechanism 11a is provided, for example, the gate part 11 is measured according to the advance or retreat of the connector 50 of a coaxial cable using a hinge mechanism. It is comprised so that it may move to the front-back direction with respect to the container 100. FIG.

  The gate portion 11 is restricted in movement in the front-rear direction by the stopper means 11b so as not to move outward from the substantially vertical direction with respect to the ground so that the connector 50 of the coaxial cable can be easily brought into contact. Moreover, the gate part 11 is set as the structure by which a pressure is always applied to the outer side seeing from the measuring device 100 with a desired force by means, such as a gate part spring 11c, for example. With these configurations, the gate portion 11 is held by the force of the gate portion spring 11c at a position substantially perpendicular to the ground before the coaxial cable connector 50 is brought into contact therewith.

  The center conductor contact portion 12 is electrically connected to the gate portion 11. The center conductor contact portion 12 contacts the center conductor contact portion 13 prior to the contact between the outer conductor 52 and the outer conductor contact portion 13 when the coaxial cable connector 50 is brought into contact with the gate portion 11. In order to do so, it is formed in a shape protruding from the surface of the gate portion 11 in a protruding shape. The diameter of the protrusion is smaller than the inner diameter of the outer conductor 52, and the shape may be, for example, a cylindrical shape or a conical shape. Further, the center conductor contact portion movable mechanism 12b and the center conductor contact portion spring 12c are formed so that the center conductor contact portion 12 is pushed in the traveling direction of the connector 50 of the coaxial cable by the pressure with which the center conductor 51 comes into contact. The gate portion 11 is formed so that the outer conductor 52 and the outer conductor contact portion 13 are in contact with each other while maintaining the contact between the center conductor 51 and the center conductor contact portion 12 after the center conductor contact portion 12 is pressed. Yes. Specifically, the center conductor contact part movable mechanism 12b is formed by punching the gate part 11 so that the member of the center conductor contact part 12 can slide back and forth, for example. In addition, the member of the center conductor contact portion 12 is moved outward as viewed from the gate portion 11 with a desired force by means such as the center conductor contact portion spring 12c provided between the center conductor contact portion 12 and the gate portion 11. It is configured to always apply pressure. That is, the center conductor contact portion spring 12c applies pressure to the member of the center conductor contact portion 12 in a direction repelling the progression of the connector 50 of the coaxial cable. With these configurations, when the member of the center conductor contact portion 12 is pressed, the center conductor contact portion 12 slides in the traveling direction of the connector 50 of the coaxial cable by the pressure with which the center conductor contact portion 12 contacts the center conductor 51.

  Furthermore, after the center conductor 51 of the connector 50 of the coaxial cable comes into contact with the center conductor contact portion 12, the tip of the center conductor 51 is fitted into the recessed portion 12a so that the center conductor contact portion 12 does not fall off from the center conductor contact portion 12. After the center conductor contact portion 12 is pushed down by the progress of the connector 50, the recess portion 12a matched to the diameter of the tip end portion of the center conductor 51 so that the contact between the center conductor 51 and the center conductor contact portion 12 can be maintained completely. Is a protrusion-like shape provided on the top. Further, the shape of the recess 12a is such that when the center conductor 51 of the connector 50 of the coaxial cable is brought into contact, the tip of the center conductor 51 is easily fitted into the recess 12a, and the gate 11 is rotated. It is good also as a cone-shaped hollow shape with a narrow back part of a recessed part so that the front-end | tip of the center conductor 51 may come out from the hollow part 12a smoothly when it does not prevent the progress of the connector 50 of a coaxial cable. The central conductor contact portion spring 12c and the gate portion spring 11c are set so that the pressure necessary for rotating the gate portion 11 is larger than the pressure necessary for sliding the central conductor contact portion movable mechanism 12b. The repulsive force of each of the springs is predetermined.

[Operation of measuring device protection device]
Next, an example of the operation of the measuring instrument protection apparatus 1 described above will be described with reference to FIGS.

  In order to connect the coaxial cable connector 50 to the measuring instrument 100, the user brings the coaxial cable connector 50 closer to the gate portion 11 as shown in FIG. First, the tip of the center conductor 51 is fitted into the recess 12 a, and the center conductor 51 is electrically connected to the ground of the measuring instrument 100 via the gate portion 11 and the gate support portion 10. That is, when the coaxial cable connector 50 is brought into contact with the gate portion 11, the center conductor contact portion 12 is connected to the center conductor contact portion 12 before the contact between the outer conductor 52 and the outer conductor contact portion 13. Will come into contact. By this operation, when there is a static electricity charged between the center conductor 51 and the outer conductor 52, it is grounded to the ground of the measuring instrument 100 and discharged.

  Next, as shown in FIG. 3, when the user further brings the connector 50 of the coaxial cable closer to the measuring instrument 100, the center conductor contact part movable mechanism 12b and the center conductor contact part spring 12c operate. That is, when the pressure at which the member of the center conductor contact portion 12 is pressed becomes larger than the repulsive force of the center conductor contact portion spring 12c provided between the center conductor contact portion 12 and the gate portion 11, the center conductor contact portion 12 slides in the advancing direction of the connector 50 of the coaxial cable by the pressure at which it contacts the central conductor 51.

  The outer conductor 52 is electrically connected to the outer conductor contact portion 13 provided in the gate portion 11 by the center conductor contact portion 12 being slid in the traveling direction of the connector 50 of the coaxial cable by the pressure at which the center conductor contact portion 12 comes into contact. Is done. By this operation, the center conductor 51 and the outer conductor 52 are electrically short-circuited, and the outer conductor 52 is grounded to the ground of the measuring instrument 100 and discharge is performed. Here, since the outer conductor 52 is grounded to the ground of the measuring instrument 100, there is an AC leak that occurs when the ground connection is not established between the chassis of the measuring instrument 100 and the chassis of the object to be measured (not shown). Even in this case, the measuring instrument 100 and the object to be measured can be set to the same potential. In the case of this AC leak, a more reliable operation can be achieved if the contact between the center conductor 51 and the center conductor contact portion 12 and the contact between the outer conductor 52 and the outer conductor contact portion 13 are at the same time. Can be realized.

  Next, as shown in FIG. 4, when the user further brings the coaxial cable connector 50 closer to the measuring instrument 100, the gate portion 11 is rotated by the pressure accompanying the progress of the coaxial cable connector 50, and the coaxial cable connector 50. And the distal end of the central conductor 51 comes out of the recess 12a, so that the connector 50 of the coaxial cable can be connected to the connector 60 provided in the measuring instrument 100. That is, when the pressure at which the gate portion 11 is pushed down by the connector 50 of the coaxial cable becomes larger than the repulsive force of the gate portion spring 11c provided between the gate support portion 10 and the gate portion 11, the gate portion 11 rotates. The screw portion (not shown) constituting the outer conductor 52 of the connector 50 of the coaxial cable can be connected to the connector 60 provided in the measuring instrument 100. It becomes.

  An example of the operation of the measuring instrument protection apparatus 1 described above will be described with reference to the flowchart shown in FIG. The apparatus configuration is the same as that described with reference to FIGS.

  When the user brings the connector 50 of the coaxial cable closer to the gate portion 11 and brings the connector 50 of the coaxial cable into contact with the gate portion 11, the center conductor 51 comes before the contact between the outer conductor 52 and the outer conductor contact portion 13. Contacts the central conductor contact portion 12 (S201).

  A recess 12a larger than the diameter of the center conductor 51 is provided at the top of the center conductor contact portion 12, and after the center conductor 51 comes into contact with the center conductor contact portion 12, the tip of the center conductor 51 becomes the recess 12a. The contact between the center conductor 51 and the center conductor contact portion 12 is maintained (S202).

  When the user further brings the coaxial cable connector 50 closer to the measuring instrument 100, the central conductor contact portion 12 is pushed in the direction of travel of the coaxial cable connector 50 by the pressure with which the central conductor 51 contacts (S203).

  When the user further brings the coaxial cable connector 50 closer to the measuring instrument 100, the outer conductor 52 and the outer conductor contact portion 13 come into contact with each other while maintaining the contact between the center conductor 51 and the center conductor contact portion 12 (S204).

  When the user further brings the coaxial cable connector 50 closer to the measuring instrument 100, the coaxial cable connector 50 is provided in the measuring instrument 100 by rotating the gate portion 11 by the pressure accompanying the progression of the coaxial cable connector 50. The connection to the connector 60 is enabled (S205).

  As described above, according to the measuring instrument protection device of the present invention, the center conductor 51 and the outer conductor 52 are electrically short-circuited, and the outer conductor 52 is grounded to the ground of the measuring instrument 100 to be discharged. As a result, static electricity charged between the central conductor and the outer conductor can be completely discharged. For this reason, it is possible to completely eliminate the possibility that the semiconductor element used in the input / output part of the measuring instrument will be destroyed and the measuring instrument becomes unusable. Time can be eliminated, and the burden on the user can be reduced.

  Furthermore, according to the measuring device protection apparatus of the present invention, since the recess 12a larger than the diameter of the center conductor 51 is provided at the top of the center conductor contact portion 12, the tip of the center conductor 51 is fitted into the recess 12a. After the center conductor contact portion 12 is pushed down by the progress of the connector 50 of the coaxial cable, the outer conductor does not fall off from the center conductor contact portion 12 while maintaining the contact between the center conductor 51 and the center conductor contact portion 12 completely. 52 and the outer conductor contact portion 13 can be brought into contact with each other. As a result, it is possible to completely eliminate the possibility that the semiconductor element used in the input / output unit of the measuring instrument is destroyed and the measuring instrument becomes unusable.

DESCRIPTION OF SYMBOLS 1 ... Measuring device protection apparatus 10 ... Gate support part 11 ... Gate part 11a ... Gate part movable mechanism 11b ... Stopper means 11c ... Gate part spring 12 ... Center conductor contact part 12a ... Depression part 12b ... Center conductor contact part movable mechanism 12c ... Center conductor contact portion spring 13 ... outer conductor contact portion 40 ... coaxial cable 50 ... connector (coaxial cable side)
51 ... Center conductor 52 ... External conductor 60 ... Connector (measuring instrument side)
100 ... Measuring instrument

Claims (5)

A measuring instrument protection device (1) for a measuring instrument (100) to which a connector (50) of a coaxial cable having a central conductor (51) and an outer conductor (52) can be connected,
A gate support (10) electrically connected to the ground of the measuring instrument;
It is electrically connected to the gate support and is provided at a position that prevents the coaxial cable connector from advancing to the connector (60) provided on the measuring instrument. A moving gate part (11),
The gate part is
A central conductor contact portion (12) electrically connected to the gate portion for contacting the central conductor;
An outer conductor contact portion (13) electrically connected to the gate portion and for contacting the outer conductor;
The center conductor contact portion contacts the center conductor contact portion before the contact between the outer conductor and the outer conductor contact portion when the coaxial cable connector is brought into contact with the gate portion. Formed so as to be pushed in the direction of travel of the connector of the coaxial cable by the pressure with which the central conductor contacts,
The gate portion is formed such that the outer conductor and the outer conductor contact portion are in contact with each other while maintaining the contact between the center conductor and the center conductor contact portion after the center conductor contact portion is pressed,
A measuring instrument protection device that enables the connector of the coaxial cable to be connected to a connector provided in the measuring instrument by rotating the gate portion by the pressure accompanying the progress of the connector of the coaxial cable.   The measuring device protection apparatus according to claim 1, wherein a depression (12a) larger than the diameter of the central conductor is provided at the top of the central conductor contact portion. A center conductor contact portion movable mechanism (12b) formed so that a member of the center conductor contact portion stored in the gate portion can slide back and forth with respect to the traveling direction of the connector of the coaxial cable;
A center conductor contact portion spring (12c) provided between the center conductor contact portion and the gate portion, which applies pressure in a direction repelling the progress of the connector of the coaxial cable to the member of the center conductor contact portion; 3. The measuring instrument protection device according to claim 1, wherein the center conductor contact portion is pushed down in a traveling direction of the connector of the coaxial cable by a pressure with which the center conductor contacts. . A measuring instrument protection method for a measuring instrument (100) to which a connector (50) of a coaxial cable having a central conductor (51) and an outer conductor (52) can be connected,
A gate support (10) electrically connected to the ground of the measuring instrument;
It is electrically connected to the gate support and is provided at a position that prevents the coaxial cable connector from advancing to the connector (60) provided on the measuring instrument. A moving gate part (11),
The gate part is
A central conductor contact portion (12) electrically connected to the gate portion for contacting the central conductor;
An outer conductor contact portion (13) electrically connected to the gate portion and for contacting the outer conductor;
When the connector of the coaxial cable is brought into contact with the gate portion, the step of contacting the center conductor with the center conductor contact portion before the contact between the outer conductor and the outer conductor contact portion (S201);
The center conductor contact portion is pushed down in the direction of travel of the connector of the coaxial cable by the pressure with which the center conductor contacts (S203);
The outer conductor and the outer conductor contact portion are in contact with each other while maintaining the contact between the center conductor and the center conductor contact portion (S204);
The step of enabling the connection of the connector of the coaxial cable to the connector provided in the measuring instrument by rotating the gate portion by the pressure accompanying the progress of the connector of the coaxial cable (S205). Protection method. The top of the central conductor contact portion is provided with a recess (12a) larger than the diameter of the central conductor,
After the center conductor comes into contact with the center conductor contact portion, the front end of the center conductor is fitted into the recess, and the contact between the center conductor and the center conductor contact portion is maintained (S202). The measuring instrument protection method according to claim 4.

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