CN110554301A - Method for detecting machine resistance of electric measuring machine and printed circuit board electric measuring machine - Google Patents
Method for detecting machine resistance of electric measuring machine and printed circuit board electric measuring machine Download PDFInfo
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- CN110554301A CN110554301A CN201910839908.4A CN201910839908A CN110554301A CN 110554301 A CN110554301 A CN 110554301A CN 201910839908 A CN201910839908 A CN 201910839908A CN 110554301 A CN110554301 A CN 110554301A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012360 testing method Methods 0.000 claims abstract description 102
- 239000011159 matrix material Substances 0.000 claims abstract description 42
- 239000000523 sample Substances 0.000 claims description 27
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
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- 238000005259 measurement Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/073—Multiple probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2813—Checking the presence, location, orientation or value, e.g. resistance, of components or conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a method for detecting the machine resistance of an electric measuring machine and an electric measuring machine of a printed circuit board, wherein the detection method utilizes a specially designed test fixture and the printed circuit board to ensure that a dot matrix of the electric measuring machine and each conducting hole on the printed circuit board respectively form an independent test network; then, conducting test is carried out by utilizing the test network, the whole machine resistance range of the dot matrix of the electric measuring machine is measured by setting different resistance threshold values and according to the conducting test result, parameter adjustment or restoration is carried out on the electric measuring machine according to the machine resistance range value, the test accuracy and stability of the electric measuring machine are effectively improved, the printed circuit board electric measuring machine is specially designed aiming at the machine resistance detection method of the electric measuring machine, the printed circuit board is positioned quickly, the whole machine resistance range of the dot matrix of the electric measuring machine is favorably and quickly determined, the detection efficiency and the detection accuracy are improved, and the method is more practical and reliable.
Description
Technical Field
The invention relates to the technical field of printed circuits, in particular to a method for detecting a machine resistor of an electric measuring machine and the electric measuring machine suitable for a printed circuit board.
Background
The universal electric measuring machine is a common detecting device for detecting open circuit and short circuit of present printed circuit board, and it uses needle bed of standard density lattice as medium for connecting test tool and switch card. When an open circuit test is carried out, a resistance threshold value needs to be set by the machine, and when the measured resistance is smaller than or equal to the threshold value, conduction is judged; and when the measured resistance is larger than the threshold value, determining that the circuit is open. However, according to the design of the machine, the end points of the testing printed circuit board network are connected with the machine through the jig, the needle bed and the conducting wire, and the machine also has resistance. When the electrical measuring machine is used for testing, the measured resistance comprises the resistance of the machine in addition to the resistance of the printed circuit board, and the accuracy of the resistance threshold value is influenced.
In order to eliminate the influence of machine resistance, a method for setting a compensation value is generally adopted at present, but the accuracy of the compensation value also influences the accuracy of open circuit test of the electric measuring machine, when the compensation value is greater than the machine resistance, the electric measuring machine leaks to test an open circuit, and when the compensation value is less than the machine resistance, the electric measuring machine can make misjudgment. At present, a method for measuring machine resistance can only carry out single-point random test, but a general electric measuring machine usually has more than 8 ten thousand test points, the machine resistance can change along with the aging of the machine and related accessories, the machine resistance of each test point can be different, and the machine resistance of a plurality of randomly measured points can not represent the condition of the whole machine resistance. How to quickly and accurately establish a test network and comprehensively measure the machine resistance or the connection state of all the dot matrixes has great significance for improving the accuracy of the open circuit test of the electric measuring machine and maintaining the machine.
disclosure of Invention
the invention aims to solve at least one technical problem in the prior art, and provides a method for detecting the machine resistance of an electrical measuring machine and an electrical measuring machine of a printed circuit board, which can quickly determine the integral machine resistance range value of a dot matrix of the electrical measuring machine and is beneficial to improving the test accuracy of the electrical measuring machine.
according to an aspect of the invention, there is provided a method of detecting machine resistance of an electrical measuring machine, comprising the steps of:
Step 1: manufacturing a corresponding test fixture and a corresponding printed circuit board according to the dot matrix coordinates of the electric measuring machine;
Step 2: positioning the test fixture and the printed circuit board to enable the dot matrix of the electric tester and each via hole on the printed circuit board to respectively form an independent test network;
And step 3: and conducting test is carried out by utilizing the test network, and the range value of the machine resistance is measured by setting different resistance threshold values and according to the conducting test result.
preferably, the method further comprises the step 4: and setting a proper resistance compensation value according to the range value of the machine resistance.
Preferably, the method further comprises the step 4: and selecting the dot matrix of the abnormal part of the machine resistor for maintenance or part replacement according to the range value of the machine resistor.
Preferably, the compensated actual resistance threshold satisfies:
Ra＝Rs+(Rc-Rm)；
during the conduction test, setting Rc to 0, and then Ra to Rs-Rm, wherein Ra is the actual resistance threshold value after compensation, Rs is the set resistance threshold value, Rc is the resistance compensation value, and Rm is the machine resistance.
preferably, in step 3, the conduction testing method includes:
When Rx is less than or equal to Ra, judging that the connection is conducted;
when Rx is greater than Ra, judging the circuit to be open, wherein Rx is the resistance value at two ends of the test network;
Preferably, in step 3, regarding Rx ═ 0 in a single test network, the result of the turn-on test can be obtained as follows:
When Rx is less than or equal to Ra, Rx is less than or equal to Rs-Rm, namely Rm is less than or equal to Rs;
When Rx > Ra, Rx > Rs-Rm, i.e., Rm > Rs.
preferably, Rs is set to R1, and if the test is open, Rm > R1 is determined;
the Rs is set to R2, and if the test is on at this time, Rm is determined to be less than or equal to R2.
preferably, in step 3, the Rs is set in a sequence from low to high resistance or from high to low resistance.
has the advantages that: the detection method is suitable for detecting the machine resistance of the electric measuring machine, and makes the dot matrix of the electric measuring machine and each via hole on the printed circuit board respectively form an independent test network by utilizing a specially designed test fixture and the printed circuit board; and then, conducting test is carried out by utilizing the test network, the whole machine resistance range of the electric measuring machine lattice is measured by setting different resistance threshold values and according to the conducting test result, the connection state of the electric measuring machine lattice is determined, the electric measuring machine can be subjected to parameter adjustment or repair according to the machine resistance range value, and the test accuracy and stability of the electric measuring machine are effectively improved.
according to another aspect of the invention, there is provided a printed circuit board electrical measuring machine, which is suitable for the above method for detecting the machine resistance of the electrical measuring machine, and comprises:
the test fixture comprises an upper fixture and a lower fixture;
The upper lattice comprises an upper needle bed and an upper switch card, wherein the upper needle bed is provided with a plurality of power-on measuring needles penetrating through the upper jig, and the upper switch card is connected with the power-on measuring needles to control the switch of each power-on measuring needle;
The lower lattice comprises a lower needle bed and a lower switch card, a plurality of lower electrical probes penetrating through the lower jig are arranged on the lower needle bed, and the lower switch card is connected with the lower electrical probes to control the switch of each lower electrical probe;
the upper electric measuring pins correspond to the lower electric measuring pins one by one, so that the upper electric measuring pins and the lower electric measuring pins are connected through via holes of a printed circuit board to form an independent testing network.
Preferably, the upper jig and the lower jig are made of insulating materials.
Has the advantages that: the printed circuit board electric measuring machine is specially designed aiming at the electric measuring machine resistance detection method, and the printed circuit board is tested by utilizing the matching of an upper dot matrix and a lower dot matrix, wherein an upper electric measuring needle of the upper needle bed corresponds to a lower electric measuring needle of the lower needle bed in a one-to-one manner, and the upper switch card and the lower switch card respectively control the switch of a single upper electric measuring needle and the switch of the lower electric measuring needle, and the printed circuit board is quickly positioned by a test fixture during testing, so that the upper electric measuring needle and the lower electric measuring needle are connected through a via hole on the printed circuit board to form an independent test network, the conduction test of the test network is facilitated, the quick positioning operation is realized, the quick determination of the whole machine resistance range of the electric measuring machine dot matrix is facilitated, the detection efficiency and the detection accuracy are.
Drawings
the invention is further described below with reference to the accompanying drawings and examples;
FIG. 1 is a flow chart of a detection method according to an embodiment of the present invention;
FIG. 2 is a logic diagram of a detection method according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a test fixture according to an embodiment of the present invention;
FIG. 4 is a schematic view of a printed circuit board structure according to an embodiment of the present invention;
Fig. 5 is a test state diagram of the electrical measuring machine according to the embodiment of the invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
in the description of the present invention, it should be understood that the orientation or positional relationship referred to, for example, the upper, lower, etc., is indicated based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
in the description of the present invention, a plurality means two or more, and greater than, less than, more than, etc. are understood as not including the essential numbers.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, an embodiment provides a detection method suitable for detecting the machine resistance of an electrical measuring machine, the detection method comprising the steps of:
step 1: according to the lattice coordinates of the electric measuring machine, a test fixture 30 and a printed circuit board 40 which are specially used for detection are manufactured.
In an embodiment, the dot matrix of the electrical tester includes an upper dot matrix 10 and a lower dot matrix 20, the testing fixture 30 includes an upper fixture 31 and a lower fixture 32, the upper fixture 31 is installed on the upper dot matrix 10 in a matching manner, the upper fixture 31 is provided with upper through holes 311 corresponding to electrical pins of the upper dot matrix 10, the lower fixture 32 is installed on the lower dot matrix 20 in a matching manner, the lower fixture 32 is provided with lower through holes 321 corresponding to electrical pins of the lower dot matrix 20, the upper dot matrix 10 and the lower dot matrix 20 are arranged oppositely, the positions of the via holes 41 formed on the printed circuit board 40 are consistent with the distribution positions of the electrical pins of the dot matrix, the via holes 41 are formed by a copper plating process, as shown in fig. 3, the structure diagram of the testing fixture 30 is shown, and fig. 4 is the structure diagram.
Step 2: the printed circuit board 40 is clamped by the test fixture 30, the upper dot matrix 10 and the lower dot matrix 20 of the electric tester are conducted through the via holes 41 of the printed circuit board 40, and each via hole 41 and the upper and lower dot matrices form an independent test network.
The printed circuit board 40 is clamped by the upper jig 31 and the lower jig 32 in a matching manner, and the upper dot matrix, the lower dot matrix and the via hole 41 can be quickly positioned when the test jig 30 clamps the printed circuit board 40 because the electrical pins of the upper dot matrix and the lower dot matrix are opposite and are in one-to-one correspondence with the via hole 41, and the via hole 41 plays a role in conducting electricity.
Since the test network uses a single via hole 41 for testing, the resistance of the single via hole 41 is very small, about 0.002 ohm, which is negligible, and the resistance at both ends of the test network is Rx, which can be regarded as Rx 0 during the test.
And step 3: and conducting test is carried out by utilizing the test network, and the range value of the machine resistance is measured by setting different resistance threshold values and according to the conducting test result.
And 4, step 4: and setting a proper resistance compensation value according to the range value of the machine resistance.
referring to fig. 2, in step 3, a calculation is performed according to a relation of Ra ═ Rs + (Rc-Rm) in combination with a conduction test result, wherein the conduction test principle is as follows: detecting the resistance values at two ends of the test network by using a single test network as a test loop, and judging that the test network is conducted when Rx is less than or equal to Ra; when Rx > Ra, judging the circuit to be open; wherein, Ra is the actual resistance threshold after compensation, Rs is the set resistance threshold, Rc is the resistance compensation value, Rm is the machine resistance, and Rx is the resistance value at both ends of the test network.
During testing, the resistance values at two ends of the test network are ignored, namely Rx is equal to 0; meanwhile, the test loop is set to be in a state without resistance compensation, namely Rc is 0, and Ra is Rs-Rm, different Rs are set according to a conduction test formula of Rx and Ra, and the range of Rm can be tested according to a test conduction result.
Specifically, the machine resistance compensation value is set to 0, and the range of the machine resistance is determined by testing the conduction and open circuit conditions of different upper and lower dot matrixes under different resistance threshold conditions.
When Rx is less than or equal to Ra, Rx is less than or equal to Rs-Rm, namely Rm is less than or equal to Rs;
When Rx > Ra, Rx > Rs-Rm, i.e., Rm > Rs.
In the embodiment, the selection sequence of the resistance threshold Rs is from high to low;
selecting Rs as R1, and if the test is open-circuit, determining Rm to be R1;
And selecting Rs as R2, and if the test is conducted, determining Rm to be less than or equal to R2.
In step 4, according to the test result of Rm, an appropriate resistance compensation value Rc is set, so that the influence on the test result caused by inaccuracy of Rm can be eliminated, and Rm is set to be the best Rc during actual product electricity measurement, so that the resistance compensation value can counteract the influence of machine resistance, and the accuracy of the test of the electric measuring machine is improved.
in another embodiment, steps 1-3 are the same as the above embodiments, and in step 4, the connection status of all the lattices is determined according to the test result of Rm, and the lattices with abnormal machine resistance can be selectively repaired or replaced with accessories to maintain the stability of the electrical measuring machine. If a certain test network is detected as an open circuit and the resistance value is too large during testing, the electrical probe can be replaced by a choice under the condition of poor contact or aging.
referring to fig. 3-5, in another embodiment, an electrical tester for a printed circuit board is provided, which is suitable for the above-mentioned method for detecting the machine resistance of the electrical tester, and includes a testing fixture 30, an upper dot matrix 10 and a lower dot matrix 20, wherein the testing fixture 30 includes an upper fixture 31 and a lower fixture 32, the testing fixture 30 is designed for the electrical tester, the upper fixture 31 is provided with an upper through hole 311 corresponding to an electrical probe of the upper dot matrix 10, the upper fixture 31 is mounted on the bottom surface of the upper dot matrix 10 in a matching manner, the lower fixture 32 is provided with a lower through hole 321 corresponding to an electrical probe of the lower dot matrix 20, the lower fixture 32 is mounted on the upper surface of the lower dot matrix 20 in a matching manner, and the upper dot matrix 10 is disposed opposite to the lower dot matrix 20.
As shown in fig. 5, in the embodiment, the upper dot matrix 10 includes an upper needle bed 11 and an upper switch card 12, a plurality of upper probes 13 are distributed on the upper needle bed 11 in an array, and the upper through holes 311 of the upper jig 31 correspond to the upper probes 13 one by one, so that when the upper jig 31 is installed, the upper probes 13 can pass through the upper jig 31, and the top ends of the upper probes 13 protrude from the bottom surface of the upper jig 31. The upper switch card 12 is connected with the upper electricity measuring needle 13, the upper switch card 12 is positioned on the back of the upper needle bed 11, and the upper switch card 12 is used for independently controlling the switch of each upper electricity measuring needle 13.
the lower dot matrix 20 comprises a lower needle bed 21 and a lower switch 22, a plurality of lower electrical probes 23 are distributed on the lower needle bed 21 in an arrayed manner, and the lower through holes 321 of the lower jig 32 correspond to the lower electrical probes 23 one by one, so that when the lower jig 32 is installed, the lower electrical probes 23 can penetrate through the lower jig 32, and the top ends of the lower electrical probes 23 protrude out of the upper surface of the lower jig 32. The lower switch card 22 is connected with the lower electric needles 23, the lower switch card 22 is positioned on the back surface of the lower needle bed 21, and the lower switch card 22 is used for independently controlling the switch of each lower electric needle 23. The upper switch card 12 and the lower switch card 22 are circuit cards with independent relays, and input and output of each channel are controlled by the relays, so that the electrified switch of each upper electrical probe 13 and each lower electrical probe 23 can be independently controlled.
In addition, the printed circuit board used for the machine resistance test of the electric measuring machine is also specially designed, the distribution point of the through holes 41 arranged on the printed circuit board 40 is consistent with the distribution positions of the electric measuring pins of the upper and lower dot matrixes, and the through holes 41 are formed by adopting a copper plating process, so that the electric measuring pins 13 and the lower electric measuring pins 23 can be connected through the through holes 41.
during testing, the printed circuit board 40 is placed between the upper dot matrix 10 and the lower dot matrix 20, the printed circuit board 40 is clamped by the upper jig 31 and the lower jig 32, and the corresponding upper electrical probe 13 and the corresponding lower electrical probe 23 are connected through the via hole 40 to form an independent testing network. The upper jig 31 and the lower jig 32 are made of insulating materials, and as the upper jig 31 and the lower jig are made of plastic plates, the contact between the printed circuit board 40 and the upper needle bed 11 and the lower needle bed 21 and the conduction between the electrical needles are effectively isolated, and the accuracy of the test is prevented from being influenced.
In the embodiment, the diameters of the top ends of the upper electrical probe 13 and the lower electrical probe 23 are slightly larger than the diameter of the via hole 41, the upper electrical probe 13 is connected with the upper switch card 12 through the upper elastic conductive piece 14, and the lower electrical probe 23 is connected with the lower switch card 22 through the lower elastic conductive piece 24, so that the top ends of the upper electrical probe 13 and the lower electrical probe 23 can be in close contact with the via hole 41, and poor contact is avoided. The upper elastic conductive piece 14 and the lower elastic conductive piece 24 are used as connecting springs, and the structure is simple and practical.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A method for detecting the machine resistance of an electric measuring machine is characterized in that: the method comprises the following steps:
step 1: manufacturing a corresponding test fixture and a corresponding printed circuit board according to the dot matrix coordinates of the electric measuring machine;
step 2: positioning the test fixture and the printed circuit board to enable the dot matrix of the electric tester and each via hole on the printed circuit board to respectively form an independent test network;
And step 3: and conducting test is carried out by utilizing the test network, and the range value of the machine resistance is measured by setting different resistance threshold values and according to the conducting test result.
2. The method of detecting machine resistance of an electrical measuring machine as claimed in claim 1, wherein: further comprising the step 4: and setting a proper resistance compensation value according to the range value of the machine resistance.
3. the method of detecting machine resistance of an electrical measuring machine as claimed in claim 1, wherein: further comprising the step 4: and selecting the dot matrix of the abnormal part of the machine resistor for maintenance or part replacement according to the range value of the machine resistor.
4. the method of detecting machine resistance of an electrical measuring machine as claimed in claim 1, wherein:
The compensated actual resistance threshold satisfies:
Ra＝Rs+(Rc-Rm)；
During the conduction test, setting Rc to 0, and then Ra to Rs-Rm, wherein Ra is the actual resistance threshold value after compensation, Rs is the set resistance threshold value, Rc is the resistance compensation value, and Rm is the machine resistance.
5. the method of detecting machine resistance of an electrical measuring machine according to claim 4, wherein: in step 3, the conduction testing method includes:
when Rx is less than or equal to Ra, judging that the connection is conducted;
and when Rx is greater than Ra, judging the circuit to be open, wherein Rx is the resistance value at two ends of the test network.
6. the method of detecting machine resistance of an electrical measuring machine as claimed in claim 5, wherein: in step 3, regarding Rx as 0 in a single test network, the result of the turn-on test can be obtained as follows:
When Rx is less than or equal to Ra, Rx is less than or equal to Rs-Rm, namely Rm is less than or equal to Rs;
when Rx > Ra, Rx > Rs-Rm, i.e., Rm > Rs.
7. The method of detecting machine resistance of an electrical measuring machine as claimed in claim 6, wherein:
Setting the Rs to R1, and if the test is open-circuit at the moment, determining Rm > R1;
The Rs is set to R2, and if the test is on at this time, Rm is determined to be less than or equal to R2.
8. The method of detecting machine resistance of an electrical measuring machine as claimed in claim 7, wherein: in the step 3, the setting sequence of the Rs is selected from low resistance to high resistance or from high resistance to low resistance.
9. A printed circuit board electrical measuring machine is characterized in that: the method comprises the following steps:
the test fixture comprises an upper fixture and a lower fixture;
the upper lattice comprises an upper needle bed and an upper switch card, wherein the upper needle bed is provided with a plurality of power-on measuring needles penetrating through the upper jig, and the upper switch card is connected with the power-on measuring needles to control the switch of each power-on measuring needle;
The lower lattice comprises a lower needle bed and a lower switch card, a plurality of lower electrical probes penetrating through the lower jig are arranged on the lower needle bed, and the lower switch card is connected with the lower electrical probes to control the switch of each lower electrical probe;
The upper electric measuring pins correspond to the lower electric measuring pins one by one, so that the upper electric measuring pins and the lower electric measuring pins are connected through via holes of a printed circuit board to form an independent testing network.
10. The printed wiring board electrical tester of claim 9 wherein: the upper jig and the lower jig are both made of insulating materials.
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| CN201910839908.4A CN110554301A (en) | 2019-09-06 | 2019-09-06 | Method for detecting machine resistance of electric measuring machine and printed circuit board electric measuring machine |
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| CN201910839908.4A CN110554301A (en) | 2019-09-06 | 2019-09-06 | Method for detecting machine resistance of electric measuring machine and printed circuit board electric measuring machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113325295A (en) * | 2021-05-13 | 2021-08-31 | 江苏普诺威电子股份有限公司 | Reliability test method for planar buried capacitor substrate micro short circuit |
| CN114167259A (en) * | 2021-12-07 | 2022-03-11 | 华东光电集成器件研究所 | Method for programming and testing on-off of through holes of multi-piece substrate |
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| EP0977041A2 (en) * | 1998-07-30 | 2000-02-02 | Siemens Aktiengesellschaft | Transducer arrangement for protection apparatus and power breakers |
| TW564946U (en) * | 2002-11-06 | 2003-12-01 | Forever Advanced Technology Co | Tool structure of circuit board detection device |
| KR20060005044A (en) * | 2004-07-12 | 2006-01-17 | (주)엠엘비시스템 | Complex dedicate tester for pcb |
| JP2010185697A (en) * | 2009-02-10 | 2010-08-26 | Micro Craft Kk | Apparatus and method for inspecting printed circuit board |
| DE102009016789A1 (en) * | 2009-04-07 | 2010-10-21 | Robert Melder | Method for electrical functional testing of single-side or double-side electrically contactable test point of e.g. printed circuit board, involves arranging contact points, which fulfill condition in which area is greater than distance |
| JP2011096836A (en) * | 2009-10-29 | 2011-05-12 | Ishioka:Kk | Method and device for inspecting printed board |
| CN211061641U (en) * | 2019-09-06 | 2020-07-21 | 依利安达(广州)电子有限公司 | Electric measuring machine for printed circuit board |
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| CN113325295A (en) * | 2021-05-13 | 2021-08-31 | 江苏普诺威电子股份有限公司 | Reliability test method for planar buried capacitor substrate micro short circuit |
| CN113325295B (en) * | 2021-05-13 | 2022-07-19 | 江苏普诺威电子股份有限公司 | Reliability test method for planar buried capacitor substrate micro short circuit |
| CN114167259A (en) * | 2021-12-07 | 2022-03-11 | 华东光电集成器件研究所 | Method for programming and testing on-off of through holes of multi-piece substrate |
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