CN204302384U - The testing arrangement of external interface contact impedance - Google Patents

Abstract

A test device for contact impedance of an external interface, which includes: a printed circuit fixture board; several pads arranged in sequence on the printed circuit fixture board; at least one male end connected to the interface, which is fixed On the printed circuit fixture board, each terminal of the male end connection interface is adapted to each pin of the external interface to be tested; several copper wires, one end of each copper wire is electrically connected to the solder plate, and the other end is electrically connected to the terminal of the male end connection interface. The test device for the contact impedance of the external interface of the utility model can accurately measure the contact impedance of the external interface, and there is no phenomenon of missing pins.

Description

Test device for external interface contact impedance

【Technical field】

The utility model relates to a testing technology of contact impedance, in particular to a testing device for contact impedance of an external interface.

【Background technique】

After the printed circuit board (PCB) is manufactured, it is necessary to test the performance of the external interface, and the contact impedance of the external interface is one of the important detection items. The contact impedance of the external interface is tested by cooperating with the male end connection interface, so that Check whether the resistance value and continuity between the external interface and the docking point meet the specification requirements, and whether there is excessive internal interference or gap.

For example, please refer to shown in Figure 1, which is a schematic diagram of a testing device for the contact impedance of an external interface in the prior art. When testing external interfaces 10 such as HDMI, Video, and e SATA, it is necessary to cooperate with a universal male end connection interface 20. Contact impedance test, and the general-purpose male end connection interface 20 is generally equipped with a cable 22 . After adaptation, use one probe of the micro-ohm tester to test pin 11 of the external interface 10, and the other probe to test the corresponding terminal 21 of the male end connection interface 20 to obtain the contact impedance of pin 11 of the external interface 10 , by judging whether the contact impedance exceeds the maximum contact impedance value, so as to judge whether the external interface meets the specification.

However, when testing the prior art, the general-purpose male end connection interface 20 generally has a cable 22, and the cable 22 itself has a relatively large impedance, which can reach more than 30mΩ, which increases the test result, so it is necessary to estimate the cable 22. The impedance of the cable 22 itself, and then calculate the contact impedance of each pin 11 of the external interface 10, the test accuracy is not high; It is not easy to accurately find the respective terminals 21 corresponding to the respective pins 11 of the external interface 10 , and there may be missing pins 11 .

In view of this, it is necessary to develop a test device for external interface contact impedance to solve the above problems.

【Content of invention】

Therefore, the purpose of this utility model is to provide a test device for contact impedance of an external interface, which can accurately measure the contact impedance of an external interface without missing pins. .

In order to achieve the above object, the test device of the external interface contact impedance of the utility model comprises:

Printed circuit fixture board;

a plurality of pads arranged in sequence on the printed circuit fixture board;

At least one male end connection interface, which is fixed on the printed circuit fixture board, and each terminal of the male end connection interface is adapted to each pin of the external interface to be tested;

A plurality of copper wires, one end of each copper wire is electrically connected to the pad, and the other end is electrically connected to the terminal of the male end connection interface.

Preferably, the number of the pads is 19.

Preferably, the copper wires corresponding to different male end connection interfaces are arranged on different insulating layers of the printed circuit fixture board.

Compared with the prior art, the external interface contact impedance testing device of the present utility model fixes the male end connection interface on the printed circuit fixture board, and uses low-impedance copper wires for the terminals of the male end connection interface. Connected to the pad, the impedance of the copper wire is only a few micro-ohms, the impedance is small, the error is small, and the test is accurate; when testing, you only need to use one probe of the micro-ohm tester to test the external interface pin, and the other probe to test The pads corresponding to the pins are sufficient, and there is no need to search for the terminals corresponding to the pins again, so there will be no missing pins.

【Description of drawings】

FIG. 1 is a schematic diagram of a test device for contact impedance of an external interface in the prior art.

FIG. 2 is a schematic diagram of a test device for contact impedance of an external interface of the present invention.

【Detailed ways】

Please refer to FIG. 2 , which shows a schematic diagram of a test device for contact impedance of an external interface of the present invention.

In this embodiment, the test device of the external interface contact impedance of the utility model is used to test the contact impedance of each pin 11 of the external interface 10, and the test device of the external interface contact impedance includes:

Printed circuit fixture board 100;

Several pads 101 are arranged in sequence on the printed circuit fixture board 100, and for the convenience of testing, the pads 101 are larger pad points;

At least one male end connection interface 102, which is fixed on the printed circuit fixture board 100, each terminal 103 of the male end connection interface 102 is adapted to each pin 11 of the external interface 10 to be tested;

A plurality of copper wires 104 , one end of each copper wire 104 is electrically connected to the pad 101 , and the other end is electrically connected to the terminal 103 of the male end connection interface 102 .

Wherein, in order to test different external interfaces 10 , for example, HDMI has 19 pins, Video has 15 pins, and USB3.0 has 9 pins, so the number of pads 101 is set to 19.

Wherein, in order to facilitate wiring on the printed circuit fixture board 100 , the copper wires 104 corresponding to different male end connection interfaces 102 are provided on different insulating layers of the printed circuit fixture board 100 .

In the test device for external interface contact impedance of the present utility model, the commonly used male end connection interface 102 is welded and fixed on the printed circuit fixture board 100, and each terminal 103 of the fixed male end connection interface 100 uses a low-impedance The copper wire 104 is extended to the bonding pad 101 . During testing, it is only necessary to use one probe of the micro-ohm tester to test the pin 11 of the external interface 10 , and the other probe to test the pad 101 corresponding to the pin 11 .

The external interface contact impedance testing device of the present utility model, because the terminal 103 of the male head end connection interface 102 is connected to the pad 101 by a copper wire 104, the impedance of the copper wire 104 is only a few mΩ, the impedance is small, the error is small, and the test is accurate and during the test, there is no need to search for the terminal 103 corresponding to the pin 11 of the external interface 10 again, so there will be no missing pin 11.

Claims (3)

1. a testing arrangement for external interface contact impedance, is characterized in that, the testing arrangement of described external interface contact impedance comprises:

Printed circuit jig plate;

Several pads, it arranges in order is located on described printed circuit jig plate;

At least one male end connecting interface, it is fixed on described printed circuit jig plate, each terminal of described male end connecting interface and each pin of external interface to be measured suitable;

Some copper conductors, respectively this copper conductor one end is electrically connected described pad, and the other end is electrically connected the terminal of described male end connecting interface.

2. the testing arrangement of external interface contact impedance according to claim 1, is characterized in that, the quantity of described pad is 19.

3. the testing arrangement of external interface contact impedance according to claim 1, is characterized in that, the different copper conductors corresponding to male end connecting interface is located on the different insulating barrier of described printed circuit jig plate.