CN101788612B - Resistance measuring module of PCB (printed circuit board) and measuring method thereof - Google Patents
Resistance measuring module of PCB (printed circuit board) and measuring method thereof Download PDFInfo
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- CN101788612B CN101788612B CN200910009601A CN200910009601A CN101788612B CN 101788612 B CN101788612 B CN 101788612B CN 200910009601 A CN200910009601 A CN 200910009601A CN 200910009601 A CN200910009601 A CN 200910009601A CN 101788612 B CN101788612 B CN 101788612B
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Abstract
The invention discloses a resistance measuring module of a PCB (printed circuit board) and a measuring method thereof. The measuring module includes an upper contact needle head which is electrically connected with a first upper power line and a second upper power line at the same time, a first lower contact needle head in electrical connection with a first lower power line, a second lower contact needle head in electrical connection with a second lower power line, and a resistance measuring instrument in electrical connection with the first upper power line, the second upper power line, the first lower power line and the second lower power line. The invention provides the resistance measuring module in the forms of four-line three-needle and four-line two-needle, and can greatly lower the production cost and the processing difficulty of the measuring module.
Description
Technical field
The present invention relates to a kind of resistance measurement module and measuring method thereof of printed circuit board (PCB), particularly in order to the error amount of measuring resistance a kind of resistance measurement module and measuring method thereof less than 0.1 ohm printed circuit board (PCB).
Background technology
Fig. 1 is the instrumentation plan of known resistance measurement module.See also Fig. 1; Known resistance measurement module 10 comprises on first on the contact needle 11, second contact needle 12, first time contact needle 13, second time contact needle 14 and resistance measuring instrument 15; Contact needle 11 connects line of electric force 16 on first on first; Contact needle 12 connects first time line of electric force 18 of 17, the first times contact needles of line of electric force, 13 connections on second on second, and second time contact needle 14 connects second time line of electric force 19.When desire detects printed circuit board (PCB) 20 to be measured; On first on the contact needle 11 and second contact needle 12 can be arranged at simultaneously on the tin ball 21 of printed circuit board (PCB) 20 to be measured, and first time contact needle 13 and second time contact needle 14 are arranged on the metal gasket 22 of printed circuit board (PCB) 20 to be measured simultaneously.Because contact needle has pin footpath (being about 50 μ m), and contact needle distance is set is 70 μ m, so tin ball 21 diameter minimums can only arrive 73-75 μ m.
Because present electronic product is microminiaturization constantly; Therefore the design of circuit board also diminishes thereupon; The diameter of tin ball 21 also need and then reduce; For asking the littler tin ball 21 of test, therefore must make the pin footpath of littler contact needle and the distance that is provided with of reducing contact needle, possibly significantly increase cost and processing difficulties degree.
Summary of the invention
In order to address the above problem, the purpose of this invention is to provide a kind of resistance measurement module of printed circuit board (PCB), comprise contact needle, first time contact needle, second time contact needle and resistance measuring instrument (the for example resistance measurement function in the avometer).Line of electric force electric connection on the line of electric force and second on the last contact needle while and first; First time contact needle and first time line of electric force electrically connect; Second time contact needle and second time line of electric force electrically connect, and line of electric force, first time line of electric force and second time line of electric force electric connection on the line of electric force, second on resistance measuring instrument and first.
It should be noted; The resistance measurement module of printed circuit board (PCB) of the present invention also comprises a plurality of switch and a plurality of switches down gone up; The said switch of going up is located at respectively on first on the line of electric force and second on the line of electric force, and said switch down is located at respectively on first time line of electric force and the second time line of electric force.
The object of the present invention is to provide a kind of resistance measurement module of printed circuit board (PCB), comprise contact needle, following contact needle and resistance measuring instrument.On the last contact needle and first on the line of electric force and second line of electric force be connected; Following contact needle is connected with first time line of electric force and second time line of electric force simultaneously, and line of electric force, first time line of electric force and second time line of electric force electric connection on the line of electric force, second on resistance measuring instrument and first.
The object of the present invention is to provide a kind of measuring method of resistance measurement module of printed circuit board (PCB); Its step comprises: provide the resistance measurement module of printed circuit board (PCB) and printed circuit board (PCB) to be measured to electrically connect; This resistance measurement module comprise simultaneously and first on line of electric force electrically connects on the line of electric force and second last contact needle, the first time contact needle that electrically connects with first time line of electric force, the second time contact needle that electrically connects with second time line of electric force, with first on the resistance measuring instrument that electrically connects of line of electric force on the line of electric force, second, this first time line of electric force and second time line of electric force, respectively be located on first on the line of electric force and second a plurality of on the line of electric force go up switches and be located at first time line of electric force respectively and second time line of electric force on a plurality of under switches; Wherein, resistance R in the system of measurement module and printed circuit board (PCB) to be measured
4W3P=2* [(go up the interior resistance R uw+ that resistance R us+ in the switch goes up line of electric force and go up the resistance R j between the supreme contact needle coiling of the line of electric force joint point)+(under the contact resistance Rdc+ of following contact needle and printed circuit board (PCB) to be measured under the interior resistance R dw+ of line of electric force joint line of electric force to the resistance R dj+ between the contact needle down the interior resistance R ds of switch)]; Conducting and last contact needle electrically connect first on line of electric force and first time line of electric force; And line of electric force and second time line of electric force are for opening circuit on second, and the resistance R t+ that measures the resistance value R1=(go up in the switch on the resistance R us+ first on the interior resistance R uw+ first of line of electric force the resistance R j between the supreme contact needle coiling of the line of electric force joint point) of this step+go up contact pin goes up the interior resistance R p+ (on following contact needle and the printed circuit board (PCB) to be measured first time line of electric force joint of contact resistance Rdc+ of metal gasket under the interior resistance R ds of switch under the interior resistance R dw+ of first time line of electric force of resistance R dj+ between the contact needle) of the contact resistance Ruc+ printed circuit board (PCB) to be measured of tin sphere on contact needle and the printed circuit board (PCB) to be measured; Conducting and last contact needle electrically connect second on line of electric force and second time line of electric force; And line of electric force and first time line of electric force are for opening circuit on first, and the resistance R t+ that measures the resistance value R2=(go up in the switch on the resistance R us+ second on the interior resistance R uw+ second of line of electric force the resistance R k between the supreme contact needle coiling of the line of electric force joint point) of this step+go up contact pin goes up the interior resistance R p+ (on following contact needle and the printed circuit board (PCB) to be measured second time line of electric force joint of contact resistance Rdc+ of metal gasket under the interior resistance R ds of switch under the interior resistance R dw+ of second time line of electric force of resistance R dj+ between the contact needle) of the contact resistance Ruc+ printed circuit board (PCB) to be measured of tin sphere on contact needle and the printed circuit board (PCB) to be measured; And calculating (resistance R in the system of resistance value R1+ resistance value R2-measurement module and printed circuit board (PCB) to be measured
4W3P)/2, the resistance R t+ that the interior resistance R p+ that tries to achieve printed circuit board (PCB) to be measured should go up contact pin goes up the contact resistance Ruc of tin sphere on contact needle and this printed circuit board (PCB) to be measured.
It should be noted; The resistance R t of last contact pin is a known conditions; Can ignore and do not remember and go up on contact needle and the printed circuit board (PCB) to be measured the contact resistance Ruc of tin sphere, so the interior resistance R p=of printed circuit board (PCB) to be measured [(resistance R in the system of resistance value R1+ resistance value R2-measurement module and printed circuit board (PCB) to be measured
4W3P)/2]-the resistance R t of contact pin gone up.
It should be noted that the measurement resistance error amount of printed circuit board (PCB) to be measured is less than 0.1 ohm.
It should be noted; Printed circuit board (PCB) to be measured comprises upper surface and lower surface, and upper surface comprises a plurality of tin balls, and lower surface comprises a plurality of metal gaskets; And last contact needle electrically connects with the tin ball respectively, and first time contact needle and second time contact needle are connected with metal gasket respectively.
The object of the present invention is to provide a kind of measuring method of resistance measurement module of printed circuit board (PCB); Its step comprises: provide the resistance measurement module of printed circuit board (PCB) and printed circuit board (PCB) to be measured to electrically connect; The resistance measurement module comprise simultaneously and first on line of electric force is connected on the line of electric force and second last contact needle, the following contact needle that is connected with first time line of electric force and second time line of electric force simultaneously, with first on line of electric force, first time line of electric force and second time line of electric force electric connection on the line of electric force, second the resistance measuring instrument, respectively be located on first a plurality of upward switches on the line of electric force on the line of electric force and second and be located at first time line of electric force respectively and second time line of electric force on a plurality of under switches; Wherein, resistance R in the system of measurement module and printed circuit board (PCB) to be measured
4W2P=2* [(go up the interior resistance R uw+ that resistance R us+ in the switch goes up line of electric force and go up the resistance R j between the supreme contact needle coiling of the line of electric force joint point)+(under the interior resistance R dw+ of following line of electric force joint line of electric force to the resistance R jd+ between the contact needle coiling point down in the switch resistance R ds)]; Conducting and last contact needle electrically connect first on line of electric force and first time line of electric force; And line of electric force and second time line of electric force are for opening circuit on second, and the resistance R t+ that measures the resistance value R1=(go up in the switch on the resistance R us+ first on the interior resistance R uw+ first of line of electric force the resistance R j between the supreme contact needle coiling of the line of electric force joint point) of this step+go up contact pin goes up under the resistance R td+ of contact pin under the interior resistance R p+ of the contact resistance Ruc+ printed circuit board (PCB) to be measured of tin sphere on contact needle and the printed circuit board (PCB) to be measured the contact resistance Rdc+ of metal gasket on the contact needle and printed circuit board (PCB) to be measured (the interior resistance R ds of switch under the interior resistance R dw+ of the first time line of electric force of resistance R jd+ between first time line of electric force joint to the contact needle coiling down); Conducting and last contact needle electrically connect second on line of electric force and second time line of electric force; And line of electric force and first time line of electric force are for opening circuit on first, and the resistance R t+ that measures the resistance value R2=(go up in the switch on the resistance R us+ second on the interior resistance R uw+ second of line of electric force the resistance R j between the supreme contact needle coiling of the line of electric force joint point) of this step+go up contact pin goes up under the resistance R td+ of contact pin under the interior resistance R p+ of the contact resistance Ruc+ printed circuit board (PCB) to be measured of tin sphere on contact needle and the printed circuit board (PCB) to be measured the contact resistance Rdc+ of metal gasket on the contact needle and printed circuit board (PCB) to be measured (the interior resistance R ds of switch under the interior resistance R dw+ of second time line of electric force joint and the following contact needle second time line of electric force of resistance R jd+ between winding the line); And calculating (resistance R in the system of resistance value R1+ resistance value R2-measurement module and printed circuit board (PCB) to be measured
4W2P)/2, the resistance R td+ that the interior resistance R p+ that tries to achieve printed circuit board (PCB) to be measured goes up contact pin under the resistance R t+ of contact pin goes up under the contact resistance Ruc+ of tin sphere on contact needle and the printed circuit board (PCB) to be measured the contact resistance Rdc of metal gasket on the contact needle and printed circuit board (PCB) to be measured.
It should be noted; The resistance R t of last contact pin and the resistance R td of following contact pin are known conditions; Can ignore and do not remember and go up on contact resistance Ruc and time contact needle and the printed circuit board (PCB) to be measured of tin sphere on contact needle and the printed circuit board (PCB) to be measured the contact resistance Rdc of metal gasket, so the interior resistance R p=of printed circuit board (PCB) to be measured [(resistance R in the system of resistance value R1+ resistance value R2-measurement module and printed circuit board (PCB) to be measured
4W2P)/2]-(the upward resistance R td of contact pin under the resistance R t+ of contact pin).
The present invention provides the resistance measurement module of four lines, three aciculiform formulas and four lines, two aciculiform formulas, can significantly reduce the manufacturing cost and the processing difficulties degree of measurement module.
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment and conjunction with figs. elaborates.
Description of drawings
Fig. 1 is the instrumentation plan of known resistance measurement module;
Fig. 2 is the instrumentation plan of the resistance measurement module of printed circuit board (PCB) of the present invention;
Fig. 3 is the measuring method process flow diagram of the resistance measurement module of printed circuit board (PCB) of the present invention;
Fig. 4 is another examples measure synoptic diagram of the resistance measurement module of printed circuit board (PCB) of the present invention; And
Fig. 5 is another examples measure method flow diagram of the resistance measurement module of printed circuit board (PCB) of the present invention.
Description of reference numerals in the above-mentioned accompanying drawing is following:
Known technology
10～resistance measurement module; Contact needle on 11～the first;
Contact needle on 12～the second; 13～the first times contact needles;
14～the second times contact needles; 15～resistance measuring instrument;
Line of electric force on 16～the first; Line of electric force on 17～the second;
18～the first times line of electric force; 19～the second times line of electric force;
20～printed circuit board (PCB) to be measured; 21～tin ball;
22～metal gasket.
The present invention
30,60～resistance measurement module; 31,61～upward contact needles;
32～the first times contact needles; 33～the second times contact needles;
34,64～resistance measuring instrument; 35, line of electric force on 65～the first;
36, line of electric force on 66～the second; 37,67～the first times line of electric force;
38,68～the second times line of electric force; 40,70～printed circuit board (PCB) to be measured;
41,71～upper surface; 42,72～lower surface;
43,73～tin ball; 44,75～metal gasket;
50,51,80,81～upward switches; 52,53,82,83～following switch;
62～following contact needle.
Embodiment
Fig. 2 is the instrumentation plan of the resistance measurement module of printed circuit board (PCB) of the present invention.See also Fig. 2, the resistance measurement module 30 of printed circuit board (PCB) of the present invention comprises contact needle 31, first time contact needle 32, second time contact needle 33 and resistance measuring instrument 34.Line of electric force 36 electric connections on the line of electric force 35 and second on last 31 whiles of contact needle and first; First time contact needle 32 and first time line of electric force 37 electrically connect; Second time contact needle 33 and second time line of electric force 38 electrically connect, and line of electric force 36 and second time line of electric force 38 electric connection on the line of electric force 35 on resistance measuring instrument 34 and first, first time line of electric force 37, second.
Fig. 3 is the measuring method process flow diagram of the resistance measurement module of printed circuit board (PCB) of the present invention.Please arrange in pairs or groups and consult Fig. 2 and Fig. 3; When resistance measurement module 30 when detecting printed circuit board (PCB) 40 to be measured; A1. provide the resistance measurement module 30 of printed circuit board (PCB) to electrically connect with printed circuit board (PCB) 40 to be measured; Promptly go up contact needle 31 and contact with the tin ball 43 of the upper surface 41 of printed circuit board (PCB) 40 to be measured, then the while contacts with the metal gasket 44 of the lower surface 42 of printed circuit board (PCB) 40 to be measured for first time contact needle 32 and second time contact needle 33.
Wherein, resistance R in the system of measurement module and this printed circuit board (PCB) to be measured
4W3P=2* [(go up the interior resistance R uw+ that resistance R us+ in the switch goes up line of electric force and go up the resistance R j between the supreme contact needle coiling of the line of electric force joint point)+(under the contact resistance Rdc+ of following contact needle and printed circuit board (PCB) to be measured under the interior resistance R dw+ of line of electric force joint line of electric force to the resistance R dj+ between the contact needle down the interior resistance R ds of switch)].
Then, line of electric force 35 and first time line of electric force 37 in the b1. conducting first, and line of electric force 36 and second time line of electric force 38 are for opening circuit on second, i.e. switch 50 and switch 52 down in the conducting are gone up switch 51 and switch 53 down and cut off.Therefore can record resistance value R1=; The resistance R t+ of (go up in the switch on the resistance R us+ first on the interior resistance R uw+ first of line of electric force the resistance R j between the supreme contact needle coiling of the line of electric force joint point)+go up contact needle goes up the interior resistance R p+ of the contact resistance Ruc+ printed circuit board (PCB) to be measured of tin sphere on contact needle and the printed circuit board (PCB) to be measured; (the interior resistance R ds of switch under the interior resistance R dw+ of the first time line of electric force of resistance R dj+ on following contact needle and the printed circuit board (PCB) to be measured between first time line of electric force joint of contact resistance Rdc+ of metal gasket to the following contact needle).
Continue, line of electric force 36 and second time line of electric force 38 in the c1. conducting second, and on first line of electric force 35 and first time line of electric force 37 for opening circuit.Therefore can record resistance value R2=; The resistance R t+ of (go up in the switch on the resistance R us+ second on the interior resistance R uw+ second of line of electric force the resistance R j between the supreme contact needle coiling of the line of electric force joint point)+go up contact pin goes up the interior resistance R p+ of the contact resistance Ruc+ printed circuit board (PCB) to be measured of tin sphere on contact needle and the printed circuit board (PCB) to be measured; (the interior resistance R ds of switch under the interior resistance R dw+ of the second time line of electric force of resistance R dj+ on following contact needle and the printed circuit board (PCB) to be measured between second time line of electric force joint of contact resistance Rdc+ of metal gasket to the following contact needle).
At last, d1. calculates (resistance R in the system of resistance value R1+ resistance value R2-measurement module and printed circuit board (PCB) to be measured
4W3P)/2, the resistance R t+ that can try to achieve the last contact needle of interior resistance R p+ of printed circuit board (PCB) to be measured goes up the contact resistance Ruc of tin sphere on contact needle and the printed circuit board (PCB) to be measured.It should be noted; The resistance R t of last contact needle is a known conditions; Can ignore and do not remember and go up on contact needle and the printed circuit board (PCB) to be measured the contact resistance Ruc of tin sphere, so obtain interior resistance R the p=[(resistance R in the system of resistance value R1+ resistance value R2-measurement module and printed circuit board (PCB) to be measured of printed circuit board (PCB) to be measured
4W3P)/2]-the resistance R t of contact needle gone up.In addition, the measurement resistance error amount of printed circuit board (PCB) 40 to be measured is less than 0.1 ohm.
Fig. 4 is another examples measure synoptic diagram of the resistance measurement module of printed circuit board (PCB) of the present invention.See also Fig. 4, the resistance measurement module 60 of printed circuit board (PCB) of the present invention comprises contact needle 61, following contact needle 62 and resistance measuring instrument 64.Line of electric force 66 electric connections on the line of electric force 65 and second on last 61 whiles of contact needle and first; Following contact needle 62 simultaneously and first time line of electric force 67 and second time line of electric force 68 electrically connect and line of electric force 66 and second time line of electric force 68 electric connection on the line of electric force 65 on resistance measuring instrument 64 and first, first time line of electric force 67, second.
Fig. 5 is another examples measure method flow diagram of the resistance measurement module of printed circuit board (PCB) of the present invention.Please arrange in pairs or groups and consult Fig. 4 and Fig. 5; When resistance measurement module 60 when detecting printed circuit board (PCB) 70 to be measured; A2. provide the resistance measurement module 60 of printed circuit board (PCB) to electrically connect with printed circuit board (PCB) 70 to be measured; Promptly go up contact needle 61 and contact, and contact needle 62 contacts with the metal gasket 75 of the lower surface 72 of printed circuit board (PCB) 70 to be measured down with the tin ball 73 of the upper surface 71 of printed circuit board (PCB) 70 to be measured.
Wherein, resistance R in the system of measurement module and this printed circuit board (PCB) to be measured
4W2P=2* [(go up the interior resistance R uw+ that resistance R us+ in the switch goes up line of electric force and go up the resistance R j between the supreme contact needle coiling of the line of electric force joint point)+(under the interior resistance R dw+ of following line of electric force joint line of electric force to the resistance R jd+ between the contact needle coiling point down in the switch resistance R ds)].
Then, line of electric force 65 and first time line of electric force 67 in the b2. conducting first, and line of electric force 66 and second time line of electric force 68 are for opening circuit on second, i.e. switch 80 and switch 82 down in the conducting are gone up switch 81 and switch 83 down and cut off.Therefore can be measured resistance value R1 = (upper switch internal resistance Rus + first on the power line internal resistance Ruw + first on the power cord connector first contact with the needle winding point resistance between Rj) + upper contact needle resistance Rt + on contact with the needle and to be measured, the printed circuit board solder spherical contact resistance Ruc + to be measured, a printed circuit board internal resistance Rp + lower contact needles resistance Rtd + from contact with the needle and to be measured, the printed circuit board metal pad contact resistance Rdc + (first lower power line connector to the lower contact resistance between the needle wound Rjd + first lower internal resistance of the power line under the switch Rdw + internal resistance Rds).
Continue, line of electric force 66 and second time line of electric force 68 in the c2. conducting second, and on first line of electric force 65 and first time line of electric force 67 for opening circuit.Therefore can be measured resistance value R2 = (upper switch internal resistance Rus + second on the power line internal resistance Ruw + second on the power cord connector first contact with the needle winding point between the resistor Rj) + upper contact needle resistance Rt + on contact with the needle and to be measured, the printed circuit board solder spherical contact resistance Ruc + to be measured, a printed circuit board internal resistance Rp + lower contact needles resistance Rtd + from contact with the needle and to be measured, the printed circuit board metal pad contact resistance Rdc + (second lower power line connector and lower contact resistance between the needle wound Rjd + second power line under the internal resistance of the switch Rdw + internal resistance Rds).
At last, d2. calculates (resistance R in the system of resistance value R1+ resistance value R2-measurement module and printed circuit board (PCB) to be measured
4W2P)/2, the resistance R td+ that the interior resistance R p+ that tries to achieve printed circuit board (PCB) to be measured goes up contact needle under the resistance R t+ of contact needle goes up under the contact resistance Ruc+ of tin sphere on contact needle and the printed circuit board (PCB) to be measured the contact resistance Rdc of metal gasket on the contact needle and printed circuit board (PCB) to be measured.It should be noted; The resistance R t of last contact needle and the resistance R td of following contact needle are known conditions; Can ignore and do not remember and go up on contact resistance Ruc and time contact needle and the printed circuit board (PCB) to be measured of tin sphere on contact needle and the printed circuit board (PCB) to be measured the contact resistance Rdc of metal gasket, so the interior resistance R p=of printed circuit board (PCB) to be measured [(resistance R in the system of resistance value R1+ resistance value R2-measurement module and printed circuit board (PCB) to be measured
4W2P)/2]-(the upward resistance R td of contact needle under the resistance R t+ of contact needle).
In sum; When electronic product microminiaturization constantly; And when the design of circuit board also diminished thereupon, wiring density also improved thereupon, for asking the circuit board of the high wiring density of test; The present invention provides the resistance measurement module of four lines, three aciculiform formulas and four lines, two aciculiform formulas, possibly significantly reduce the manufacturing cost and the processing difficulties degree of measurement module.
Though the present invention is disclosed in preferred embodiment; Right its is not in order to limit the present invention; Any those of ordinary skills; Do not breaking away from the spirit and scope of the present invention, when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the scope that claim defined.
Claims (10)
1. the resistance measurement module of a printed circuit board (PCB) comprises:
Contact needle on one, line of electric force electric connection on the line of electric force and one second on the while and one first;
One first time contact needle electrically connects with one first time line of electric force;
One second time contact needle electrically connects with one second time line of electric force; And
One resistance measuring instrument, with this line of electric force on first, this on second line of electric force, this first time line of electric force and this second time line of electric force electrically connect.
2. the resistance measurement module of printed circuit board (PCB) as claimed in claim 1; It also comprises a plurality of switch and a plurality of switches down gone up; Said a plurality of switch of going up is located at this respectively on first on line of electric force and this second on the line of electric force, and said a plurality of switches down are located at respectively on this first time line of electric force and this second time line of electric force.
3. the resistance measurement module of a printed circuit board (PCB) comprises:
Contact needle on one, with one first on the line of electric force and one second line of electric force electrically connect;
Once contact needle electrically connects with one first time line of electric force and one second time line of electric force simultaneously; And
One resistance measuring instrument, with this line of electric force on first, this on second line of electric force, this first time line of electric force and this second time line of electric force electrically connect.
4. the resistance measurement module of printed circuit board (PCB) as claimed in claim 3; It also comprises a plurality of switch and a plurality of switches down gone up; Said a plurality of switch of going up is located at this respectively on first on line of electric force and this second on the line of electric force, and said a plurality of switches down are located at respectively on this first time line of electric force and this second time line of electric force.
5. the measuring method of the resistance measurement module of a printed circuit board (PCB), its step comprises:
Provide the resistance measurement module and a printed circuit board (PCB) to be measured of a printed circuit board (PCB) to electrically connect; This resistance measurement module comprise simultaneously and one first on line of electric force is connected on the line of electric force and one second on one contact needle, the one first time contact needle that electrically connects with one first time line of electric force, the one second time contact needle that electrically connects with one second time line of electric force, with this line of electric force on first, this resistance measuring instrument that line of electric force, this first time line of electric force and this second time line of electric force electrically connect on second, respectively be located at this on first on line of electric force and this second a plurality of on the line of electric force go up switches and be located at this first time line of electric force respectively and this second time line of electric force on a plurality of under switches; Wherein, resistance R in the system of this measurement module and this printed circuit board (PCB) to be measured
4W3P=; (these are a plurality of go up one of switches this line of electric force on first of interior resistance R us+ interior resistance R uw+ this on first the line of electric force joint to the resistance R j that should go up between the contact needle coiling point)+; (these are a plurality of go up one of switches this line of electric force on second of interior resistance R us+ interior resistance R uw+ this on second the line of electric force joint to the resistance R j that should go up between the contact needle coiling point)+; (these a plurality of interior resistance R ds of one of switch down of the interior resistance R dw+ of this first time line of electric force of resistance R dj+ between this first time line of electric force joint of the contact resistance Rdc+ of this first time contact needle and this printed circuit board (PCB) to be measured to this first time contact needle)+; (these a plurality of interior resistance R ds of one of switch down of the interior resistance R dw+ of this second time line of electric force of resistance R dj+ between this second time line of electric force joint of the contact resistance Rdc+ of this second time contact needle and this printed circuit board (PCB) to be measured to this second time contact needle);
Conducting this line of electric force and this first time line of electric force on first; And this on second line of electric force and this second time line of electric force for opening circuit, measure this step resistance value R1=(these are a plurality of go up one of switches this line of electric force on first of interior resistance R us+ interior resistance R uw+ this on first the line of electric force joint to the resistance R j that should go up between the contact needle coiling point)+the resistance R t+ of contact needle should go up the contact resistance Rdc+ (the interior resistance R dw+ of this first time line of electric force of resistance R dj+ between this first time line of electric force joint to this first time contact needle these a plurality of under interior resistance R ds of one of switch) of metal gasket on this first time contact needle of interior resistance R p+ and this printed circuit board (PCB) to be measured of this printed circuit board (PCB) to be measured of contact resistance Ruc+ of tin sphere on contact needle and this printed circuit board (PCB) to be measured this on;
Conducting this line of electric force and this second time line of electric force on second; And this on first line of electric force and this first time line of electric force for opening circuit, measure this step resistance value R2=(these are a plurality of go up one of switches this line of electric force on second of interior resistance R us+ interior resistance R uw+ this on second the line of electric force joint to the resistance R j that should go up between the contact needle coiling point)+resistance R t+ of contact needle should go up the contact resistance Rdc+ (the interior resistance R ds of one of switch under this switch of interior resistance R dw+ of this second time line of electric force of resistance R dj+ between this second time line of electric force joint to this second time contact needle) of metal gasket on this second time contact needle of interior resistance R p+ and this printed circuit board (PCB) to be measured of this printed circuit board (PCB) to be measured of contact resistance Ruc+ of tin sphere on contact needle and this printed circuit board (PCB) to be measured on this; And
Calculate (resistance R in the system of this measurement module of resistance value R1+ resistance value R2-and this printed circuit board (PCB) to be measured
4W3P)/2, the resistance R t+ that the interior resistance R p+ that tries to achieve this printed circuit board (PCB) to be measured should go up contact needle should go up the contact resistance Ruc of tin sphere on contact needle and this printed circuit board (PCB) to be measured;
Wherein, The resistance R t that should go up contact needle is a known conditions; Can ignore and do not remember and should go up on contact needle and this printed circuit board (PCB) to be measured the contact resistance Ruc of tin sphere, so the interior resistance R p=of this printed circuit board (PCB) to be measured [(resistance R in the system of this measurement module of resistance value R1+ resistance value R2-and this printed circuit board (PCB) to be measured
4W3P)/2]-the resistance R t of contact needle on this.
6. the measuring method of the resistance measurement module of printed circuit board (PCB) as claimed in claim 5, wherein, the measurement resistance error amount of this printed circuit board (PCB) to be measured is less than 0.1 ohm.
7. the measuring method of the resistance measurement module of printed circuit board (PCB) as claimed in claim 5; Wherein, This printed circuit board (PCB) to be measured comprises a upper surface and a lower surface, and this upper surface comprises a plurality of tin balls, and this lower surface comprises a plurality of metal gaskets; And should go up contact needle and electrically connect with said a plurality of tin balls respectively, and this first time contact needle and this second time contact needle are connected with said a plurality of metal gaskets respectively.
8. the measuring method of the resistance measurement module of a printed circuit board (PCB), its step comprises:
Provide the resistance measurement module and a printed circuit board (PCB) to be measured of a printed circuit board (PCB) to electrically connect; This resistance measurement module comprise simultaneously and one first on line of electric force is connected on the line of electric force and one second on one contact needle, the contact needle once that is connected with one first time line of electric force and one second time line of electric force simultaneously, with this line of electric force on first, this resistance measuring instrument that line of electric force, this first time line of electric force and this second time line of electric force electrically connect on second, respectively be located at this on first on line of electric force and this second a plurality of upward switches on the line of electric force and be located at this first time line of electric force respectively and this second time line of electric force on a plurality of under switches; Wherein, resistance R in the system of this measurement module and this printed circuit board (PCB) to be measured
4W2P=; (these are a plurality of go up one of switches this line of electric force on first of interior resistance R us+ interior resistance R uw+ this on first the line of electric force joint to the resistance R j that should go up between the contact needle coiling point)+; (these are a plurality of go up one of switches this line of electric force on second of interior resistance R us+ interior resistance R uw+ this on second the line of electric force joint to the resistance R j that should go up between the contact needle coiling point)+; (these a plurality of interior resistance R ds of one of switch down of the interior resistance R dw+ of this first time line of electric force of resistance R jd+ between this first time line of electric force joint to this time contact needle coiling point)+; (these a plurality of interior resistance R ds of one of switch down of the interior resistance R dw+ of this second time line of electric force of resistance R jd+ between this second time line of electric force joint to this time contact needle coiling point);
Conducting and this line of electric force and this first time line of electric force on first that should go up that contact needle electrically connects; And this on second line of electric force and this second time line of electric force for opening circuit, measure this step resistance value R1=(these are a plurality of go up one of switches this line of electric force on first of interior resistance R us+ interior resistance R uw+ this on first the line of electric force joint to the resistance R j that should go up between the contact needle coiling point)+the resistance R t+ of contact needle should go up this printed circuit board (PCB) to be measured of contact resistance Ruc+ of tin sphere on contact needle and this printed circuit board (PCB) to be measured this on interior resistance R p+ should descend the resistance R td+ of contact needle should descend the contact resistance Rdc+ (the interior resistance R dw+ of resistance R jd+ this first time line of electric force of this first time line of electric force joint to this time contact needle between winding the line these a plurality of under interior resistance R ds of one of switch) of metal gasket on contact needle and this printed circuit board (PCB) to be measured;
Conducting and this line of electric force and this second time line of electric force on second that should go up that contact needle electrically connects; And this on first line of electric force and this first time line of electric force for opening circuit, measure this step resistance value R2=(these are a plurality of go up one of switches this line of electric force on second of interior resistance R us+ interior resistance R uw+ this on second the line of electric force joint to should go up contact needle coiling point between resistance R j)+the resistance R t+ of contact needle should go up this printed circuit board (PCB) to be measured of contact resistance Ruc+ of tin sphere on contact needle and this printed circuit board (PCB) to be measured this on interior resistance R p+ should descend the resistance R td+ of contact needle should descend metal gasket on contact needle and this printed circuit board (PCB) to be measured contact resistance Rdc+ (this second time line of electric force joint and this time contact needle wind the line between this second time line of electric force of resistance R jd+ interior resistance R dw+ this a plurality of under interior resistance R ds of one of switch); And
Calculate (resistance R in the system of this measurement module of resistance value R1+ resistance value R2-and this printed circuit board (PCB) to be measured
4W2P)/2, the contact resistance Ruc+ that the resistance R t+ that the interior resistance R p+ that tries to achieve this printed circuit board (PCB) to be measured should go up contact needle should descend the resistance R td+ of contact needle should go up tin sphere on contact needle and this printed circuit board (PCB) to be measured should descend the contact resistance Rdc of metal gasket on contact needle and this printed circuit board (PCB) to be measured;
Wherein, Upward the resistance R t of contact needle and the resistance R td of this time contact needle are known conditions; Can ignore and do not remember and should go up on contact resistance Ruc and this time contact needle and this printed circuit board (PCB) to be measured of tin sphere on contact needle and this printed circuit board (PCB) to be measured the contact resistance Rdc of metal gasket, so the interior resistance R p=of this printed circuit board (PCB) to be measured [(resistance R in the system of this measurement module of resistance value R1+ resistance value R2-and this printed circuit board (PCB) to be measured
4W2P)/2]-(resistance R t+ of contact needle should descend the resistance R td of contact needle on this).
9. the measuring method of the resistance measurement module of printed circuit board (PCB) as claimed in claim 8, wherein, the measurement resistance error amount of this printed circuit board (PCB) to be measured is less than 0.1 ohm.
10. the measuring method of the resistance measurement module of printed circuit board (PCB) as claimed in claim 8; Wherein, This printed circuit board (PCB) to be measured comprises a upper surface and a lower surface, and this upper surface comprises a plurality of tin balls, and this lower surface comprises a plurality of metal gaskets; And should go up contact needle and electrically connect with said a plurality of tin balls respectively, and this time contact needle is connected with said a plurality of metal gaskets respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910009601A CN101788612B (en) | 2009-01-23 | 2009-01-23 | Resistance measuring module of PCB (printed circuit board) and measuring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910009601A CN101788612B (en) | 2009-01-23 | 2009-01-23 | Resistance measuring module of PCB (printed circuit board) and measuring method thereof |
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| Publication Number | Publication Date |
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| CN101788612A CN101788612A (en) | 2010-07-28 |
| CN101788612B true CN101788612B (en) | 2012-09-05 |
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| CN200910009601A Expired - Fee Related CN101788612B (en) | 2009-01-23 | 2009-01-23 | Resistance measuring module of PCB (printed circuit board) and measuring method thereof |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707152B (en) * | 2012-06-04 | 2014-10-08 | 西南交通大学 | On-line detecting device for resistance value of resistance winding machine |
| CN103901275A (en) * | 2013-11-22 | 2014-07-02 | 大连太平洋电子有限公司 | Pressure sensing type conductive ink resistance value tester |
| CN105510758A (en) * | 2015-11-27 | 2016-04-20 | 湖北三江航天红峰控制有限公司 | Device for low resistance conduction |
| CN108089054B (en) * | 2016-11-22 | 2020-04-24 | 北京铁路信号有限公司 | Method for measuring contact resistance of solderless press-in connection |
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| US4952871A (en) * | 1986-06-25 | 1990-08-28 | Mania Elektronik Automatisation Entwicklung Und Geratebau Gmbh | Method and apparatus of testing printed circuit boards and assembly employable therewith |
| GB2307754A (en) * | 1995-11-30 | 1997-06-04 | Fujitsu Automation | Test/reference capacitance ratio used to assess a conductive pattern on a pcb |
| CN1387396A (en) * | 2002-05-24 | 2002-12-25 | 威盛电子股份有限公司 | Impedance measuring structure |
| CN1797012A (en) * | 2004-12-30 | 2006-07-05 | 英业达股份有限公司 | Impedance measurement system and method |
| CN1940580A (en) * | 2005-09-30 | 2007-04-04 | 英业达股份有限公司 | Circuit-board characteristic impedance measuring system and method |
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|---|---|---|---|---|
| US4952871A (en) * | 1986-06-25 | 1990-08-28 | Mania Elektronik Automatisation Entwicklung Und Geratebau Gmbh | Method and apparatus of testing printed circuit boards and assembly employable therewith |
| GB2307754A (en) * | 1995-11-30 | 1997-06-04 | Fujitsu Automation | Test/reference capacitance ratio used to assess a conductive pattern on a pcb |
| CN1387396A (en) * | 2002-05-24 | 2002-12-25 | 威盛电子股份有限公司 | Impedance measuring structure |
| CN1797012A (en) * | 2004-12-30 | 2006-07-05 | 英业达股份有限公司 | Impedance measurement system and method |
| CN1940580A (en) * | 2005-09-30 | 2007-04-04 | 英业达股份有限公司 | Circuit-board characteristic impedance measuring system and method |
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