JPH0246101Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a multi-series impedance system that integrates the characteristic impedance of electronic equipment into multiple input/output connectors of electronic equipment (hereinafter referred to as electronic measuring instruments). The purpose of the invention is to simultaneously convert to a desired characteristic impedance by attaching a conversion device separately.

Generally, high-frequency transmission lines are used by selecting the characteristic impedance with the least transmission loss, but there are multiple types of characteristic impedance of the object to be measured, for example, there are 75Ω series and 50Ω series. . Therefore, when attempting to measure the characteristics of an object to be measured without error via these transmission lines, it is necessary that the characteristic impedance of the object to be measured and the characteristic impedance of the electronic measuring instrument match. However, it is difficult for the characteristic impedance of the signal detection circuit and signal output circuit inside the measuring instrument to correspond to various types of characteristic impedance.

The present invention relates to an impedance conversion device that performs impedance conversion between an electronic measuring instrument and an object to be measured when the characteristic impedances of the electronic measuring instrument and the object to be measured do not match.

[Prior art]

It is possible to incorporate an impedance conversion function into an electronic measuring instrument, but in the high frequency band exceeding 30 MHz, there is no switch etc. that can convert the impedance to any desired impedance, so conventionally, the corresponding impedance converter was installed in an electronic measuring instrument. and the object to be measured.

FIGS. 6 and 7 show conceptual diagrams of conventional usage.

FIG. 6 shows a cable connected to the input/output section of the impedance converter. There are connectors on both ends of the cable, and by connecting the connectors to the electronic measuring instrument and the object to be measured,
It performs impedance conversion.

Figure 7 shows an impedance converter with a connector attached to the input/output section, and this connector is directly connected to the input/output connector of an electronic measuring instrument or the input/output connector of the object to be measured to perform impedance conversion. be.

However, these methods had the following drawbacks.

(1) Since independent impedance converters are attached to multiple input/output connectors of electronic measuring instruments, installation and removal are time-consuming.

(2) Since the impedance converter is independent, it falls apart after removal and is easily lost.

(3) In both Figures 6 and 7, the product value is low from a design standpoint.

(4) In the case of Figure 6, the impedance converter is located at the front of the electronic measuring instrument, which causes an error during measurement.

[Problem that the invention attempts to solve]

In view of the above-mentioned circumstances, this invention was developed to convert the characteristic impedance of an electronic measuring instrument into the characteristic impedance of a measured object by converting a multiple impedance converter into which a plurality of impedance converters are integrated into the plurality of input/output connectors. By installing a conversion device, the removal operation can be performed with one touch. The objective is to prevent individual impedance converters from being lost after being removed, and to increase the value of the product from a design standpoint.

[Means to solve the problem]

The multiple impedance conversion device according to this invention is fitted to a plurality of connectors of an electronic device, respectively, in order to match the characteristic impedance of an electronic device having a plurality of connectors and a circuit connected to the electronic device. In a multiple impedance converter equipped with impedance converters, each of the impedance converters has an input connector and an output connector at both ends on a coaxial line, and the input connector and the output connector It has a couple part 10 provided at approximately the center position with respect to the stopper part, and in order to hold the plurality of impedance converters with a desired clearance, the coupling part 10 has a coupling part 10 corresponding to the number of impedance converters that engage with the couple part. A pair of holding members 8, 8' each having a number of engagement grooves 11, and a case 1 which exposes an input plug part and an output plug part of the impedance converter and houses the holding members. ,
It is characterized in that it can be connected to a plurality of plugs of the electronic device at the same time.

〔Example〕

This invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 is a perspective exploded view showing a first embodiment of the multiple impedance conversion device according to this invention.
FIG. 3 is a sectional view taken along plane AA' in FIG. 2. In this figure, the impedance converter 2 is fixed so as to be sandwiched between a pair of holding members 8, 8' having engagement grooves 11 larger by a desired value than the diameter 10 of the couple portion of the impedance converter. At this time, the clearance between the engagement groove 11 and the diameter 10 of the coupler portion of the impedance converter 2 is set within an allowable mating dimension range of the input/output connector. Even if there is a dimensional error in the mounting pitch of the input/output connector 3 of the electronic measuring instrument shown in FIG. 1 within the above-mentioned allowable mating dimension range, the impedance converter 2 can be smoothly connected at the same time. The pair of holding members 8 and 8' are fixedly mounted on the case 1 with mounting screws 12.

FIG. 4 is an exploded perspective view showing a second embodiment of the multiple impedance conversion device according to this invention. The structures of the impedance converter 2 and the pair of holding members 8, 8' are the same as those in the first embodiment, but fixing knobs are provided on both sides of the case 1 to firmly fix the multiple impedance converters. A mounting screw 5 is provided. As shown in FIG. 1, a screw hole 4 is provided in the electronic measuring instrument 6 at a position corresponding to the mounting screw 5 with a knob, and by tightening the mounting screw 5, the electronic measuring instrument 6 can be firmly fixed.
As a result, even if a tensile force in the axial direction is applied to the impedance converter 2 connected to the object to be measured, the impedance converter will not wobble or fall out from the input/output connector 3 of the electronic measuring instrument.
Stable measurements can be made.

In the embodiment described above, the mounting screw 5 with a knob
Although the impedance converting device is fixed using screws, it may also be fixed using screws or screws.

FIG. 5 is a partially exploded perspective view showing a third embodiment of the multiple impedance conversion device according to this invention. This embodiment is designed to prevent the impedance converter 2 from rotating when tightening when the input plug of the impedance converter 2 is a screw-in type. A parallel cut surface 13A is provided on the collar 13 of the impedance converter 2, and a pair of holding members 8,
8' is formed with an abutment wall 14 that contacts the parallel cut surface 13A, thereby restraining movement in the rotational direction about the axis.

[Effect of idea]

As explained above, according to this invention, it is possible to provide a multiple impedance conversion device that can be connected with one touch to a plurality of input/output connectors of an electronic device such as an electronic measuring instrument. Then, it is possible to instantly convert an electronic device having a predetermined characteristic impedance into an electronic device having a specific characteristic impedance.

Note that the electrical transmission loss that occurs due to impedance conversion can be measured by storing the value in advance in a CPU or the like provided inside the electronic measuring instrument, for example, when the push button switch 7 shown in FIG.
When operated, the correction value is called up and transmission loss caused by impedance conversion is automatically corrected.

Further, as an application example of the present invention, the push button switch 7 provided on the main body of the electronic device may be operated by being pressed by a part of the device when multiple impedance devices are connected. . Thereby, transmission loss caused by the impedance conversion can be automatically corrected.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example in which multiple impedance conversion devices are mounted in an electronic measuring instrument, FIG. 2 is an exploded perspective view showing a first embodiment of the multiple impedance conversion devices, and FIG. AA′ sectional view of the first embodiment, FIG. 4 is an exploded perspective view showing the second embodiment of the multiple impedance conversion device, FIG. 5 is a partially exploded perspective view showing the third embodiment, and FIG. 6 , FIG. 7 is a perspective view showing an example of conventional impedance conversion. In the figure, 1 is a case, 2 is an impedance converter, 3 is an electronic measuring device input/output connector, 4 is a screw for fixing the impedance converter, 5 is a screw with a knob, 6
is an electronic measuring instrument, 7 is a conversion loss correction instruction push button switch, 8 and 8' are holding members, 10 is a couple part,
11 is an engagement groove, 12 is a mounting screw, 13 is a collar, 1
3A is a parallel cut surface, 14 is an abutment wall.

Claims (1)

[Claims for Utility Model Registration] Impedance conversion that is fitted to each of the plurality of plugs of the electronic device in order to match the characteristic impedance of an electronic device having a plurality of plugs and a circuit connected to the electronic device. In a multi-series impedance converter including: Each of the impedance converters has an input plug part and an output plug part at both ends on the coaxial line,
It also has a couple part 10 provided approximately in the center between the input connector part and the output connector part; the couple part 10 is engaged with the couple part in order to hold the plurality of impedance converters at a desired clearance. The number of engagement grooves 11 corresponds to the number of impedance converters.
a pair of holding members 8, 8'having; a case 1 that exposes the input plug portion and the output plug portion of the impedance converter and houses the holding members;
A multiple impedance conversion device characterized in that it is capable of being connected to a plurality of plugs of the electronic device at the same time.