CN203688599U

CN203688599U - Four-wire test fixture

Info

Publication number: CN203688599U
Application number: CN201320889396.0U
Authority: CN
Inventors: 徐荣; 毛黎燕; 陈书华
Original assignee: Kunshan Dingxin Electronics Co Ltd
Current assignee: Kunshan Dingxin Electronics Co Ltd
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2014-07-02
Anticipated expiration: 2023-12-31

Abstract

The utility model relates to a four-wire test fixture, which comprises an upper fixture and a lower fixture, wherein the upper fixture and the lower fixture are respectively clamped on both sides of a PCB plate, four welding disks to be tested on the PCB plate are respectively corresponding to four test pins on the upper fixture and the lower fixture one to one, the four test pins are respectively connected to fixture horns, and the fixture horns are connected to a four-wire tester for testing. In the utility model, four-wire test principles are applied, a two-wire fixture structure is used, and the four-wire tester with a low unit price is matched in order to realize the function of four-wire testing. In this way, whether a wire is smooth and a value of abnormal resistance caused by poor copper thickness can be detected. Measurement accuracy can reach 1 mOmega with low cost.

Description

Four line measurement jigs

Technical field

The utility model relates to PCB semi-manufacture detection field, relates in particular to a kind of four line measurement jigs.

Background technology

In existing PCB processing procedure, after outer-layer circuit completes, conventionally need to the conducting of circuit whether and resistance extremely detect, current measurement jig mainly comprises two kinds: one is two line measurement jigs, as shown in Figure 1, on two pads to be tested (pad) 11 that are arranged in same networking, 1 testing needle 12 is set, two testing needles 12 are connected to respectively the two ends of power supply, and reometer is series in foregoing circuit, voltage table is parallel between two testing needles, whether this mode can only detect the conducting of circuit, can not detect due to the thick bad circuit resistance abnormal problem causing of copper, measuring accuracy is only 1 Ω, another kind is four line measurement jigs, as shown in Figure 2, on two that are arranged in same networking pads 21 to be tested, two testing needles 22 are set, in two testing needles 22 on same pad 21, one is connected to power supply, another root is connected to voltage table, like this, can either measurement circuit whether conducting, also can test by the thick bad circuit resistance abnormal problem causing of copper simultaneously, and precision can reach 1m Ω, but in this mode, because the density of testing needle 22 is higher, and need four line test machines and the four-wire system of configuration specialty to make software, thereby this testing apparatus cost is very high.

Therefore, how to provide a kind of simultaneously detection line conducting and resistance abnormal, measuring accuracy is high and cost is low four line measurement jigs are those skilled in the art's technical matterss urgently to be resolved hurrily.

Utility model content

The utility model provides a kind of four line measurement jigs, to solve the problem that existing measurement jig measuring accuracy is low, cost is high.

For solving the problems of the technologies described above, the utility model provides a kind of four line measurement jigs, comprise tool and lower tool, described upper tool and lower tool are located in respectively the both sides of pcb board, four pads to be tested on described pcb board are corresponding one by one with four testing needles on described upper tool and lower tool respectively, described four testing needles are connected to respectively tool ox horn, and described tool ox horn is connected to four line wire test machines and tests.

Preferably, test circuit in described four line wire test machines comprises power supply, voltage table and reometer, wherein two testing needles are connected to respectively the two ends of described voltage table by described tool ox horn, and described power supply is connected to two other testing needle through described tool ox horn after connecting with described reometer.

Preferably, the quantity of described tool ox horn is one or three.

The four line measurement jigs that the utility model provides, have the following advantages compared to prior art tool:

1, measuring accuracy is high, can reach 1m Ω;

2, unit price only needs 30,000 yuan, compared to 1,000,000 yuan of existing professional four line measurement jigs, has greatly lowered production cost;

3, can either measurement circuit whether conducting, also can test by the thick bad circuit resistance abnormal problem causing of copper simultaneously.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of existing two line measurement jigs;

Fig. 2 is the schematic diagram of existing four line measurement jigs;

Fig. 3 is the schematic diagram of four line measurement jigs of the utility model one embodiment;

Fig. 4 is the concrete application schematic diagram of the four line measurement jigs of the utility model embodiment 1;

Fig. 5 is the concrete application schematic diagram of the four line measurement jigs of the utility model embodiment 2.

In Fig. 1 and Fig. 2: 11,21-pad, 12,22-testing needle;

In Fig. 3～5: 100,200-PCB plate, 111,211-pad, 110, the upper tool of 210-, 120, tool under 220-, 130,230-testing needle, 140-tool ox horn;

240-the first tool ox horn, 250-the second tool ox horn, 260-the 3rd tool ox horn.

Embodiment

For the technical scheme of the more detailed above-mentioned utility model of statement, below list specific embodiment and carry out Proof Technology effect; It is emphasized that these embodiment are not limited to limit scope of the present utility model for the utility model is described.

Embodiment 1

Please refer to Fig. 3 to Fig. 4, the four line measurement jigs that the utility model provides, comprise tool 110 and lower tool 120, described upper tool 110 and lower tool 120 are located in respectively the both sides of pcb board 100, four pads 111 to be tested on described pcb board 100 are corresponding one by one with four testing needles 130 on described upper tool 110 and lower tool 120 respectively, described four testing needles 130 are connected to respectively tool ox horn 140, and described tool ox horn 140 is connected to four line wire test machine (not shown)s and tests.The four line measurement jig measuring accuracies that the utility model provides are high, can reach 1m Ω; Four line test machines and four-wire system without configuration specialty are made software, and cost is low, only needs 30,000 yuan; Can either measurement circuit whether conducting, also can test by the thick bad circuit resistance abnormal problem causing of copper simultaneously.

Preferably, please emphasis with reference to figure 3, the test circuit of described four line wire test machines comprises power supply, voltage table and reometer, the two ends of described voltage table are connected to wherein two testing needles 130 by described tool ox horn 140, and described power supply is connected to two other testing needle 130 through described tool ox horn 140 after connecting with described reometer.

Preferably, please emphasis with reference to figure 4, the quantity of described tool ox horn 140 is one, now four pads 111 are all positioned at the same side of pcb board 100, now corresponding method of testing, comprises the steps:

S1: the circuit of successively selecting to need test, and in the pad corresponding with this circuit, choose four pads 111 on pcb board 100, preferably, the measurement circuit of selection is positioned at four corners of described pcb board, make measurement circuit as far as possible longer, to reach the comprehensive of monitoring.

S2: four testing needles 130 corresponding with described pad 111 are set on lower tool 120, only need a tool ox horn 140 to be connected with lower tool 120;

S3: use the method for winding of four line wire test machines to wind the line on tool ox horn 140.Tool ox horn 140 is connected to four line wire test machines to be tested.

Embodiment 2

The difference of the present embodiment and embodiment 1 is: the quantity of described tool ox horn 140 is three, and now four pads 211 are positioned at the not homonymy of pcb board 200.

That is to say: in the time that four pads 211 selecting are positioned at the not homonymy of pcb board 200, the testing needle 230 corresponding with the pad 211 that is positioned at pcb board 200 upsides is set on upper tool 210, the testing needle 230 corresponding with the pad 211 that is positioned at pcb board 200 downsides is set on lower tool 220, now select first, second, third 3 tool ox horns 240,250,260, wherein, the first tool ox horn 240 is connected on the testing needle 230 of tool 210, and is connected with the 3rd tool ox horn 260 by the winding displacement of 64PIN; The second tool ox horn 250 is connected on the testing needle 230 of lower tool 220, and by between the method for winding and the 3rd tool ox horn 260 of four line wire test machines, described the 3rd tool ox horn 260 is as the change-over terminal between the first tool ox horn 240 and the second tool ox horn 250, realizing circuit to be measured all concentrates on the measuring point of one end on the testing needle 230 of the second tool ox horn 250, thereby realize all test points all at lower tool 220, and two rows are mutually corresponding before and after measuring point, and then realize and the docking of four line wire test machines.

In sum, the four line measurement jigs that the utility model provides, comprise tool and lower tool, described upper tool and lower tool are located in respectively the both sides of pcb board, four pads to be tested on described pcb board are corresponding with four testing needles on described upper tool and lower tool respectively, described four testing needles are connected to respectively tool ox horn, and described test ox horn is connected to four line wire test machines and tests.The utility model utilizes four line test philosophies, adopt two wires jig structure, arrange in pairs or groups four line wire test machines of low unit price, realize the function of four line tests, can either detection line whether conducting, can detect again because the thick bad resistance causing of copper is abnormal, its measuring accuracy can arrive 1m Ω, and cost is low.

Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to including these changes and modification.

Claims

1. a line measurement jig, it is characterized in that, comprise tool and lower tool, described upper tool and lower tool are located in respectively the both sides of pcb board, four pads to be tested on described pcb board are corresponding one by one with four testing needles on described upper tool and lower tool respectively, described four testing needles are connected to respectively tool ox horn, and described tool ox horn is connected to four line wire test machines and tests.

2. four line measurement jigs as claimed in claim 1, it is characterized in that, the test circuit of described four line wire test machines comprises power supply, voltage table and reometer, wherein two testing needles are connected to respectively the two ends of described voltage table by described tool ox horn, and described power supply is connected to two other testing needle through described tool ox horn after connecting with described reometer.

3. four line measurement jigs as claimed in claim 1, is characterized in that, the quantity of described tool ox horn is one or three.