CN111413547A - Mainboard resistance test system and method - Google Patents
Mainboard resistance test system and method Download PDFInfo
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- CN111413547A CN111413547A CN202010373921.8A CN202010373921A CN111413547A CN 111413547 A CN111413547 A CN 111413547A CN 202010373921 A CN202010373921 A CN 202010373921A CN 111413547 A CN111413547 A CN 111413547A
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- 238000012360 testing method Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims description 15
- 238000005259 measurement Methods 0.000 claims abstract description 69
- 239000011159 matrix material Substances 0.000 claims abstract description 29
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 238000010280 constant potential charging Methods 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims description 17
- 238000010998 test method Methods 0.000 claims description 4
- 238000009530 blood pressure measurement Methods 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000000691 measurement method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000013522 software testing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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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
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- 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
Abstract
The invention discloses a mainboard resistance test system which comprises a signal input interface module, a relay matrix module, a constant current output module, a constant voltage output module, a current measurement module and a voltage measurement module, wherein the signal input interface module is connected with an interface of a PCBA to be tested and transmits a test signal, the signal input interface module is connected with the relay matrix module, the relay matrix module switches the operation of the constant current output module or the constant voltage output module and controls the constant current output module to output a constant current value and a signal to be tested so as to carry out constant current source measurement, or the constant voltage output module outputs a voltage value and a signal to be tested so as to carry out constant voltage charging measurement. By selecting the operation constant current output module and the constant voltage output module, constant voltage measurement and constant current measurement are respectively carried out to calculate the impedance value, the complex resistor-capacitor layout of the PCBA is quickly responded, the test range is large, the speed is high, the precision is high, and the cost is low. The invention also discloses a mainboard resistance testing method.
Description
Technical Field
The invention relates to the field of electronics, in particular to a mainboard resistance testing system.
Background
The main circuit system of computer is generally composed of BIOS chip, I/O control chip, key and panel control switch interface, indicator lamp plug-in unit, expansion slot, main board and DC power supply plug-in unit of plug-in card.
At present, with the increasing update of science and technology, the integration level of electronic products is higher and higher, the functionality is also stronger and stronger, almost most products have resistors, and the functions need to be tested to verify. Impedance testing has become a preferred test requirement for some companies, so that timely test verification of specific functions can be quickly performed on the designed PCBA.
However, the existing PCBA impedance test has the following drawbacks:
the traditional impedance test system has a single measurement mode, and utilizes a constant current source measurement method, and the principle is as follows: measuring small impedance by using large current, measuring large impedance by using small current, and converting impedance by using a formula of voltage/current as impedance; however, the situation of resistance parallel capacitors in the PCBA is complex, the resistance in the PCBA can be connected with the capacitors in parallel, when large resistors are measured in parallel, the constant current source measurement method utilizes small current to measure, the large capacitors are charged, the voltage of the large capacitors is unstable, the constant current source measurement time is long, the efficiency is low, the precision is low, and due to the limitation of the prior art, a single PCBA impedance test system cannot meet the industrial development.
Disclosure of Invention
In order to overcome the defects of the prior art, an object of the present invention is to provide a motherboard resistance testing system, which can solve the problems of low measurement efficiency and low precision.
One of the purposes of the invention is realized by adopting the following technical scheme:
a mainboard resistance test system comprises a signal input interface module, a relay matrix module, a constant current output module, a constant voltage output module, a current measurement module and a voltage measurement module, wherein the signal input interface module is connected with an interface of a PCBA to be tested and transmits a test signal; the relay matrix module switches the operation of the constant current output module or the constant voltage output module and controls the constant current output module to output a constant current value and a signal to be detected so as to carry out constant current source measurement, or the constant voltage output module outputs a voltage value and a signal to be detected so as to carry out constant voltage charging measurement.
Furthermore, the mainboard resistance test system further comprises a network port communication module, and the network port communication module is connected with an upper computer.
Furthermore, the network port communication module is respectively connected with the constant current output module, the constant voltage output module, the current measurement module and the voltage measurement module, and acquires data of each module and uploads the data to the upper computer.
A mainboard resistance test method is applied to a mainboard resistance test system, the mainboard resistance test system comprises a signal input interface module, a relay matrix module, a constant current output module, a constant voltage output module, a current measurement module and a voltage measurement module, the signal input interface module is connected with an interface of a PCBA to be tested and transmits test signals, the signal input interface module is connected with the relay matrix module, and the mainboard resistance test method comprises the following steps:
a signal connection step: the PCBA to be tested is connected with the signal input interface module through an interface and carries out signal transmission;
a mode selection step: detecting whether a capacitance device in the PCBA to be detected contains a capacitor, if not, executing a constant current measurement step, and if so, executing a constant voltage measurement step;
constant current measurement: the relay matrix module drives the constant current output module to operate, and constant current real-time data are generated and transmitted to the upper computer;
constant pressure measurement: the relay matrix module drives the constant voltage output module to operate, and constant voltage real-time data are generated and transmitted to the upper computer.
Further, in the constant current measuring step, the constant current output module outputs a constant current value and a signal to be measured to perform constant current source measurement.
Further, in the constant current measuring step, the upper computer calculates real-time impedance according to the constant current real-time data, and the formula is as follows: r ═ U0/I2; wherein, R represents the real-time impedance, U0 represents the voltage value detected by the voltage measuring module, and I2 represents the current value set and output by the constant current output module.
Further, in the constant voltage measurement step, the constant voltage output module outputs a voltage value and a signal to be measured to perform constant voltage charging measurement.
Further, in the constant voltage measuring step, the upper computer calculates real-time impedance according to the constant voltage real-time data, and the formula is as follows: r ═ U2/I0; wherein, R represents the real-time impedance, U2 represents the voltage value set by the constant voltage output module, and I0 represents the current value detected by the current measurement module.
Further, in the constant current measuring step, the network port communication module collects information of the constant current output module, the constant voltage output module, the current measuring module and the voltage measuring module and uploads the information to the upper computer.
Further, in the constant voltage measurement step, a network port communication module is respectively connected with the upper computer and each module, and acquires information of the constant current output module, the constant voltage output module, the current measurement module and the voltage measurement module and uploads the information to the upper computer.
Compared with the prior art, the invention has the beneficial effects that:
the signal input interface module is connected with an interface of a PCBA to be tested and transmits a test signal, the signal input interface module is connected with the relay matrix module, the relay matrix module is respectively connected with the constant current output module, the current measuring module and the voltage measuring module, and the constant voltage output module is respectively connected with the current measuring module and the constant current output module; the relay matrix module switches the operation of the constant current output module or the constant voltage output module and controls the constant current output module to output a constant current value and a signal to be detected so as to carry out constant current source measurement, or the constant voltage output module outputs a voltage value and a signal to be detected so as to carry out constant voltage charging measurement. By selecting the operation constant current output module and the constant voltage output module, constant voltage measurement and constant current measurement are respectively carried out to calculate the impedance value, the complex resistor-capacitor layout of the PCBA is quickly responded, the test range is large, the speed is high, the precision is high, and the cost is low.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a block diagram of a motherboard resistance testing system according to a preferred embodiment of the present invention;
FIG. 2 is a constant current circuit diagram;
FIG. 3 is a constant voltage circuit diagram;
fig. 4 is a flowchart of a motherboard resistance testing method.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a mainboard resistance testing system comprises a signal input interface module, a relay matrix module, a constant current output module, a constant voltage output module, a current measuring module and a voltage measuring module, wherein the signal input interface module is connected with an interface of a PCBA to be tested and transmits a test signal, the signal input interface module is connected with the relay matrix module, the relay matrix module is respectively connected with the constant current output module, the current measuring module and the voltage measuring module, and the constant voltage output module is respectively connected with the current measuring module and the constant current output module; the relay matrix module switches the operation of the constant current output module or the constant voltage output module and controls the constant current output module to output a constant current value and a signal to be detected so as to carry out constant current source measurement, or the constant voltage output module outputs a voltage value and a signal to be detected so as to carry out constant voltage charging measurement. By selecting the operation constant current output module and the constant voltage output module, constant voltage measurement and constant current measurement are respectively carried out to calculate the impedance value, the complex resistor-capacitor layout of the PCBA is quickly responded, the test range is large, the speed is high, the precision is high, and the cost is low.
Preferably, the mainboard resistance test system further comprises a network port communication module, and the network port communication module is connected with an upper computer. Specifically, the constant current output module, the current measuring module and the constant voltage output module are controlled by the internet access communication module, and a constant voltage charging measuring method and a constant current measuring method are selected. Through the cooperation of the signal input interface module, the relay matrix module, the constant current output module, the constant voltage output module, the current measuring module and the voltage measuring module, two impedance measuring methods are realized, the design period is short, and the cost is low. In a specific application, the constant current output module corresponds to a constant voltage measurement method of impedance, please refer to fig. 2, which is a constant current circuit diagram, that is: constant current measurement: the voltage (measured voltage) divided by the current (current set by the constant current source) is the impedance. Referring to fig. 3, a constant voltage circuit diagram of the constant voltage output module corresponding to the impedance measurement method is shown, that is: constant voltage charging measurement method: voltage (set voltage) divided by current (measured current) is impedance. The constant voltage output module is mainly used for a capacitor, constant voltage charging is fast, the capacitor is charged fully, current is stable fast, and measuring accuracy is high. This application is through judging earlier that PCBA that awaits measuring is fit for which kind of test, then selects, and then uses two kinds of measuring method matching nature, and performance advantage separately improves efficiency of software testing and precision.
Preferably, the network port communication module is respectively connected with the constant current output module, the constant voltage output module, the current measurement module and the voltage measurement module, and the network port communication module collects data of the modules and uploads the data to an upper computer. The data transmission and updating are facilitated, and the management and control efficiency is improved.
Referring to fig. 4, a method for testing a resistance of a motherboard is applied to a system for testing a resistance of a motherboard, the system for testing a resistance of a motherboard includes a signal input interface module, a relay matrix module, a constant current output module, a constant voltage output module, a current measurement module, and a voltage measurement module, the signal input interface module is connected to an interface of a PCBA to be tested and transmits a test signal, and the signal input interface module is connected to the relay matrix module, and the method includes the following steps:
a signal connection step: the PCBA to be tested is connected with the signal input interface module through an interface and carries out signal transmission;
a mode selection step: detecting whether a capacitance device in the PCBA to be detected contains a capacitor, if not, executing a constant current measurement step, and if so, executing a constant voltage measurement step;
constant current measurement: the relay matrix module drives the constant current output module to operate, and constant current real-time data are generated and transmitted to the upper computer; in the constant current measuring step, the constant current output module outputs a constant current value and a signal to be measured so as to carry out constant current source measurement. Preferably, the upper computer calculates the real-time impedance through the constant-current real-time data, and the formula is as follows: r ═ U0/I2; wherein, R represents the real-time impedance, U0 represents the voltage value detected by the voltage measuring module, and I2 represents the current value set and output by the constant current output module. Specifically, in the constant current measurement step, the network port communication module collects information of the constant current output module, the constant voltage output module, the current measurement module and the voltage measurement module and uploads the information to the upper computer so as to update real-time data.
Constant pressure measurement: the relay matrix module drives the constant voltage output module to operate, and constant voltage real-time data are generated and transmitted to the upper computer. In the constant voltage measurement step, the constant voltage output module outputs a voltage value and a signal to be measured to perform constant voltage charging measurement. Preferably, in the constant voltage measuring step, the upper computer calculates the real-time impedance according to the constant voltage real-time data, and the formula is as follows: r ═ U2/I0; wherein, R represents the real-time impedance, U2 represents the voltage value set by the constant voltage output module, and I0 represents the current value detected by the current measurement module. Specifically, in the constant voltage measurement step, the network port communication module is respectively connected with the upper computer and each module, and acquires information of the constant current output module, the constant voltage output module, the current measurement module and the voltage measurement module and uploads the information to the upper computer so as to update real-time data.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a mainboard resistance test system, includes signal input interface module, relay matrix module, constant current output module, constant voltage output module, current measurement module and voltage measurement module, its characterized in that:
the signal input interface module is connected with an interface of a PCBA to be tested and transmits a test signal, the signal input interface module is connected with the relay matrix module, the relay matrix module is respectively connected with the constant current output module, the current measuring module and the voltage measuring module, and the constant voltage output module is respectively connected with the current measuring module and the constant current output module; the relay matrix module switches the operation of the constant current output module or the constant voltage output module and controls the constant current output module to output a constant current value and a signal to be detected so as to carry out constant current source measurement, or the constant voltage output module outputs a voltage value and a signal to be detected so as to carry out constant voltage charging measurement.
2. A motherboard resistance testing system as recited in claim 1, wherein: the mainboard resistance test system further comprises a network port communication module, and the network port communication module is connected with an upper computer.
3. A motherboard resistance testing system as recited in claim 2, wherein: the network port communication module is respectively connected with the constant current output module, the constant voltage output module, the current measuring module and the voltage measuring module, and acquires data of the modules and uploads the data to an upper computer.
4. A mainboard resistance test method is applied to a mainboard resistance test system of any one of claims 1-3, the mainboard resistance test system comprises a signal input interface module, a relay matrix module, a constant current output module, a constant voltage output module, a current measurement module and a voltage measurement module, the signal input interface module is connected with an interface of a PCBA to be tested and transmits test signals, and the signal input interface module is connected with the relay matrix module, and the mainboard resistance test method is characterized by comprising the following steps:
a signal connection step: the PCBA to be tested is connected with the signal input interface module through an interface and carries out signal transmission;
a mode selection step: detecting whether a capacitance device in the PCBA to be detected contains a capacitor, if not, executing a constant current measurement step, and if so, executing a constant voltage measurement step;
constant current measurement: the relay matrix module drives the constant current output module to operate, and constant current real-time data are generated and transmitted to the upper computer;
constant pressure measurement: the relay matrix module drives the constant voltage output module to operate, and constant voltage real-time data are generated and transmitted to the upper computer.
5. A method for testing the resistance of a motherboard as recited in claim 4, wherein: in the constant current measuring step, the constant current output module outputs a constant current value and a signal to be measured so as to carry out constant current source measurement.
6. A method for testing the resistance of a motherboard as recited in claim 5, wherein: in the constant current measuring step, the upper computer calculates real-time impedance according to constant current real-time data, and the formula is as follows: r ═ U0/I2; wherein, R represents the real-time impedance, U0 represents the voltage value detected by the voltage measuring module, and I2 represents the current value set and output by the constant current output module.
7. A method for testing the resistance of a motherboard as recited in claim 4, wherein: in the constant voltage measurement step, the constant voltage output module outputs a voltage value and a signal to be measured to perform constant voltage charging measurement.
8. A method for testing resistance of a motherboard as recited in claim 7, wherein: in the constant voltage measuring step, the upper computer calculates real-time impedance according to constant voltage real-time data, and the formula is as follows: r ═ U2/I0; wherein, R represents the real-time impedance, U2 represents the voltage value set by the constant voltage output module, and I0 represents the current value detected by the current measurement module.
9. A method for testing the resistance of a motherboard as recited in claim 4, wherein: in the constant current measuring step, the network port communication module collects information of the constant current output module, the constant voltage output module, the current measuring module and the voltage measuring module and uploads the information to the upper computer.
10. A method for testing the resistance of a motherboard as recited in claim 4, wherein: in the constant voltage measurement step, the network port communication module is respectively connected with the upper computer and each module, and acquires information of the constant current output module, the constant voltage output module, the current measurement module and the voltage measurement module and uploads the information to the upper computer.
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Application publication date: 20200714 |