CN212364504U

CN212364504U - Four-terminal test fixture

Info

Publication number: CN212364504U
Application number: CN202020841455.7U
Authority: CN
Inventors: 陈春霞
Original assignee: Huizhou Qijia Electronics Co ltd
Current assignee: Huizhou Qijia Electronics Co ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2021-01-15
Anticipated expiration: 2030-05-19

Abstract

The utility model discloses a four terminal test fixture, including plating through-hole and pad, the pad passes through the line connection and plates the through-hole, and the position of pad corresponds the position of circuit board, and the quantity of pad corresponds the quantity of circuit board, all is equipped with two probes on every pad, the utility model discloses four terminal test fixture can effectively monitor PCB's resistance undulant, with the defective products strict the accuse, promote the PCB yields, promote the off-the-shelf result of use of product.

Description

Four-terminal test fixture

Technical Field

The utility model relates to a detect technical field, specifically be a four terminal test fixture.

Background

Nowadays, electronic products are widely applied in our lives, but the instability of the electronic products is always accompanied with the problems of battery explosion, heating and scalding, quick battery power consumption and the like, and the problems are mainly caused by abnormal reasons such as the thickness and the size of a circuit, copper plating loss of a hole wall of a copper plating hole and the like during the production of a PCB through analysis, so that certain problems are faced during testing and inspection. Through the analysis of the testing principle of the testing machine, a four-end method is adopted for testing, and the testing machine can give constant current parameters during testing and pass the change of voltage; thus the voltage and current pass through the physical formula: obtaining resistance, so that whether the resistance value of the circuit is in a given fluctuation range can be monitored through the change of the resistance value (R) to effectively control the reject ratio of the electronic product; therefore, the four-terminal jig can realize the function and monitor the resistance value of the PCB;

the existing jig can only test the short circuit and the open circuit of the PCB, can ensure the normal use of the functions of the PCB, and can not improve the user experience effect of later-stage product finished products.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a four terminal test fixture to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a four terminal test fixture, includes plated through hole and pad, the pad passes through the line connection plated through hole, and the position of pad corresponds the position of circuit board, and the quantity of pad corresponds the quantity of circuit board, all is equipped with two probes on every pad.

As a further technical solution of the present invention: the probe is fixed in a clamping mode through a test fixture.

As a further technical solution of the present invention: one of the two probes is switched on with a constant current.

As a further technical solution of the present invention: the second of the two probes is connected to the voltage to be measured.

As a further technical solution of the present invention: resistance to be measured = voltage to be measured/constant current.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses four terminal test fixture can effectively monitor PCB's resistance undulant, with the defective products strict the accuse, promote the PCB yields, promote the off-the-shelf result of use of product.

Drawings

Fig. 1 is a detection schematic diagram of the present invention.

Fig. 2 is a structural view of the present invention.

FIG. 3 is a schematic diagram of a split stitch.

In the figure: the probe comprises a first probe-1, a second probe-2, a third probe-3, a fourth probe-4, a fifth probe-5, a sixth probe-6, a seventh probe-7, an eighth probe-8, a ninth probe-9, a tenth probe-10, an eleventh probe-11, a twelfth probe-12, a thirteenth probe-13, a fourteenth probe-14, a fifteenth probe-15, a sixteenth probe-16, a circuit-17, a plated through hole-18 and a pad-19.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, example 1: the four-terminal test fixture comprises a plated through hole 18 and pads 19, wherein the pads 19 are connected with the plated through hole 18 through a circuit 17, the positions of the pads 19 correspond to the positions of circuit boards, the number of the pads 19 corresponds to the number of the circuit boards, and each pad19 is provided with two probes.

Taking fig. 2 as an example, the number of pads 19 is 8, the number of corresponding probes is 16, the probes are respectively the first probe 1, the second probe 2, the third probe 3, the fourth probe 4, the fifth probe 5, the sixth probe 6, the seventh probe 7, the eighth probe 8, the ninth probe 9, the tenth probe 10, the eleventh probe 11, the twelfth probe 12, the thirteenth probe 13, the fourteenth probe 14, the fifteenth probe 15 and the sixteenth probe 16, and the singular probes are connected to the constant current I; the voltage U measured by the even-numbered probe can be used to calculate the resistance R of the corresponding line. For example: 1,2, 3, 4; the resistance of the line between 1,2 and 3,4 can be tested; when the measured resistance is compared with the reasonable fluctuation range of the standard resistance, OK is within the range, NG is beyond the range

Embodiment 2, based on the above embodiment 1, as shown in fig. 3, a jig with split needling methods can be derived, for example: 1,2, 3, 4; the area of measurement is the circle position in fig. 3; the number of the needles arranged can be greatly reduced by arranging the needles in the mode, and the cost of customers is saved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a four terminal test fixture, includes plated through hole (18) and pad (19), its characterized in that, pad (19) pass through circuit (17) and connect plated through hole (18), and the position of pad (19) corresponds the position of circuit board, and the quantity of pad (19) corresponds the quantity of circuit board, all is equipped with two probes on every pad (19).

2. The four-terminal test fixture of claim 1, wherein the probes are fixed by a clamping means of the test fixture.

3. The four-terminal test fixture of claim 1, wherein one of the two probes is turned on with a constant current.

4. The four-terminal testing fixture of claim 3, wherein the second of said two probes is connected to a voltage to be measured.

5. The four-terminal test fixture of claim 4, wherein the resistance to be tested = voltage to be measured/constant current.