CN100554979C - A kind of broadband impedance measurement mechanism - Google Patents
A kind of broadband impedance measurement mechanism Download PDFInfo
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- CN100554979C CN100554979C CNB2008100007397A CN200810000739A CN100554979C CN 100554979 C CN100554979 C CN 100554979C CN B2008100007397 A CNB2008100007397 A CN B2008100007397A CN 200810000739 A CN200810000739 A CN 200810000739A CN 100554979 C CN100554979 C CN 100554979C
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- concentric cable
- measurement mechanism
- solder joint
- broadband impedance
- impedance measurement
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Abstract
The invention provides a kind of broadband impedance measurement mechanism, comprise signal generator and signal receiver, two sections concentric cable, wherein an end of first concentric cable links to each other with described signal generator, one end of second concentric cable links to each other with described signal receiver, wherein, the heart yearn of the heart yearn of the described first concentric cable other end and the described second concentric cable other end forms first solder joint by welding manner, and the screen layer of the screen layer of the described first concentric cable other end and the described second concentric cable other end forms second solder joint by welding manner.Measurement mechanism of the present invention is with low cost, simple to operate, can adapt to various tested object, and it is good to test flexible property.
Description
Technical field
The present invention relates to the electronic product field tests, particularly a kind of broadband impedance measurement mechanism.
Background technology
In order to guarantee the power supply integrality and the Electro Magnetic Compatibility of circuit, often need the impedance of electric capacity, inductance, isolating transformer or PCB veneer is tested.Method of testing commonly used at present is as follows:
Tested object is regarded as a two-port network.To port one, the signal that receives at port 2 according to receiver can obtain the S of this two-port network from set signal of signal source output
21Parameter (perhaps directly obtain by network analyzer, test philosophy is identical) is illustrated in figure 1 as broadband impedance method of testing schematic diagram in parallel, is illustrated in figure 2 as broadband impedance series connection method of testing schematic diagram.Wherein, the impedance of tested object can obtain according to the S21 calculation of parameter respectively, and computing formula is as follows.
Series process:
------------------------------------(1)
Multiple process:
------------------------------------(2)
But, existing method of testing is when carrying out the testing impedance of common components and parts such as electric capacity, inductance, isolating transformer with above principle, need with an auxiliary printed circuit board (PCB) (Printed CircuitBoard, PCB) plate carries out, as shown in Figure 3, with method of testing in parallel is example, and measurand is installed in advance on the PCB veneer according to the size of measurand and package design, is connected with PCB by suitable coaxial connector with the concentric cable that signal source links to each other with receiver.The PCB veneer couples together measured device and coaxial connector by the characteristic impedance track identical with concentric cable again.The so just impedance that can obtain measurand by the S21 that measures and corresponding formula.
At present the major defect of said method is: the one, and be subjected to two coaxial connectors of restriction of state-of-the art and two sections PCB tracks can not be in full accord with the impedance of concentric cable, can cause one section long discontinuous impedance, influence measuring accuracy; The 2nd, test be need under the assistance of auxiliary circuit board, finish during owing to test and cost height, long, underaction of cycle caused.
In addition, the method of testing of common components and parts such as the test of pcb board impedance and electric capacity, inductance, transformer is very similar, when using conventional test methodologies and carry out on the pcb board testing impedance between any 2, need in the PCB design, reserve the installation site and relevant auxiliary lead of coaxial connector, as shown in Figure 4, be existing method of testing test PCB broadband impedance synoptic diagram.Because being necessary to carry out the circuit board of impedance analysis generally all is the veneer of the complexity that speed is fast, capacity is big, density is high, for each test point that may need to analyze impedance reserves coaxial connector position and auxiliary track can be because the serious nervous design difficulty that increases PCB in space, influence designing quality even can't finish wiring at all.In the time of the impedance measurement of this in addition method between power supply that intercouples and ground level, also can cause bigger error because of having inserted the plane-parallel capacitor that forms between the plane between two coaxial connectors.
Summary of the invention
The objective of the invention is to, a kind of broadband impedance measurement mechanism is provided, can adapt to various tested object, it is good to test flexible property, and with low cost, simple to operate.
The invention has the beneficial effects as follows: according to broadband impedance measurement mechanism of the present invention, mode by soldering forms the broadband impedance test probe with two sections concentric cable one ends, replace coaxial connector and auxiliary PCB that conventional test methodologies relied on, make measurement mechanism with low cost, simple to operate, and can adapt to various tested object by shape and the position of regulating the test probe heart yearn, it is good to test flexible property.
Description of drawings
Fig. 1 is a broadband impedance method of testing schematic diagram in parallel;
Fig. 2 is broadband impedance series connection method of testing schematic diagram;
Fig. 3 tests common components and parts broadband impedance synoptic diagram for existing method of testing;
Fig. 4 is existing method of testing test PCB broadband impedance synoptic diagram;
Fig. 5 is a broadband impedance proving installation synoptic diagram of the present invention;
Fig. 6 is a test components and parts broadband impedance synoptic diagram of the present invention;
Fig. 7 is the broadband impedance synoptic diagram between last 2 of the test of the present invention PCB.
Embodiment
Below, 5～7 describe broadband impedance measurement mechanism of the present invention in detail with reference to the accompanying drawings.
The present invention adopts two sections uniform transmission lines of characteristic impedance (for example adopting characteristic impedance is 50 ohm concentric cable), mode by soldering forms the broadband impedance test probe, replace coaxial connector and auxiliary PCB that existing method of testing relies on, as shown in Figure 5, be broadband impedance proving installation synoptic diagram of the present invention.Fig. 5 standard coaxial cable 1 one ends link to each other with signal source S1 by connector, and the other end and concentric cable 2 are connected by soldering; The other end of concentric cable 2 is connected with signal receiver R1.The signal that signal and signal receiver R1 by signal source S1 output receives can obtain the S21 parameter in the required frequency range, in above-mentioned formula of substitution (1) or the formula (2), just can obtain the interior impedance of tested object corresponding frequency band.
In specific implementation process, the correct welding of finishing test probe is an emphasis of the present invention.The screen layer of two sections concentric cable need as far as possible mutually near and preferably the mode by soldering connect.
In addition, because it is long more to exceed the heart yearn of screen layer, can't guarantee that the uniform length of transmission line characteristic impedance is just long more, test error during high frequency is just big more, therefore, the interconnective main points of two sections coaxial cable core wires be exceed the total length of the heart yearn of screen layer must be little, be advisable with the concentric cable radius that is not more than 4 times.
In addition, when selecting concentric cable, should select relatively to fritter flexible cable as much as possible.Cable is thin more on the one hand, and it is easy more to weld, and it is short more that the discontinuous part of impedance can be done.Because the transmission of test process standard coaxial cable all is small-signal, can not produce under powered problem.Because concentric cable is shorter, the problems affect of signal attenuation is little, also can compensate in test in the time of can not ignoring simultaneously.On the other hand, the soft more just easy more also difficult drop-off of welding of finishing of cable.
Utilize aforesaid measurement mechanism of the present invention to measure, as shown in Figure 6, be test components and parts broadband impedance synoptic diagram of the present invention the impedance of the electronic devices and components of various encapsulation.The correct key of implementing of test is the welding of test probe and tested object.Total principle is that tested object as far as possible directly is connected across between the coaxial screen layer and heart yearn, avoids introducing new parasitic parameter as far as possible.When test patch magnetic bead, inductance, electric capacity etc. encapsulate smaller paster device, can adapt to various encapsulation by shape and the position of adjusting coaxial cable core wire on the test probe, but can not change the annexation of two sections coaxial cable shielding layers and heart yearn, also should avoid as far as possible on tested object, increasing lead-in wire in case introduce test error.If tested object volume is very big, two pins from far can't the connection with test probe, can on tested object pin, increase lead-in wire and come the adaptive testing probe.At this moment the test result that obtains is not the impedance of measurand, the later impedance but measurand is connected with two sections lead-in wires.Whether this situation can look measurement requirement (measuring accuracy, survey frequency height or the like) decision and be necessary by calculating the error that compensating lead wire brings, to obtain more the result near actual value.When the volume and weight of measurand is big, can also be fixed to test probe on the tested object by bonded adhesives, come off in test operating procedure to prevent solder joint.
In addition, can also utilize measurement mechanism of the present invention that the impedance that PCB goes up between close mutually arbitrarily 2 is measured, as shown in Figure 7, be the broadband impedance synoptic diagram between last 2 of the test PCB of the present invention, wherein, needs test PCB goes up the impedance between A point and the B point.PCB can be regarded as special electronic devices and components, the key of correctly finishing the last point-to-point transmission testing impedance of PCB is the correct welding of test probe and tested object.The principle that correct welding need be followed is basic identical with the test electronic devices and components.PCB and common electronic devices and components difference mainly contain 2 points, and the one, same PCB generally need carry out different tests in many places, to obtain the impedance between the various circuit networks respectively; The 2nd, the PCB general cost is higher, generally all requires can continue on for other purposes after the test.PCB generally needs by the method for spot gluing glue test probe to be fixed to PCB upward to prevent that solder joint from coming off, as shown in Figure 7 because weight and volume own is bigger.In view of above-mentioned PCB is different from two characteristics of ordinary electronic components and parts, some glue position needn't be close to test point, should avoid influencing the zone of the follow-up use of PCB as far as possible.
More than about the selecting for use of transmission line, the welding of test probe and the description of fixing means, be embodiments of the invention only, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
In sum, according to broadband impedance measurement mechanism of the present invention, mode by soldering forms the broadband impedance test probe with two sections concentric cable one ends, replace coaxial connector and auxiliary PCB that conventional test methodologies relied on, make measurement mechanism with low cost, simple to operate, and can adapt to various tested object by shape and the position of regulating the test probe heart yearn, it is good to test flexible property.
Claims (6)
1. broadband impedance measurement mechanism, comprise signal generator and signal receiver, two sections concentric cable, wherein an end of first concentric cable links to each other with described signal generator, one end of second concentric cable links to each other with described signal receiver, it is characterized in that, the heart yearn of the heart yearn of the described first concentric cable other end and the described second concentric cable other end forms first solder joint by welding manner, the screen layer of the screen layer of the described first concentric cable other end and the described second concentric cable other end forms second solder joint by welding manner, close as far as possible mutually when the screen layer of described two sections concentric cable forms described second solder joint, and two sections coaxial cable core wires exceed the total length of heart yearn of screen layer smaller or equal to 4 times concentric cable radius when interconnecting.
2. broadband impedance measurement mechanism as claimed in claim 1 is characterized in that, the heart yearn of the heart yearn of the described first concentric cable other end and the described second concentric cable other end forms first solder joint by the soldering mode.
3. broadband impedance measurement mechanism as claimed in claim 1 or 2 is characterized in that, the screen layer of the screen layer of the described first concentric cable other end and the described second concentric cable other end forms second solder joint by the soldering mode.
4. broadband impedance measurement mechanism as claimed in claim 3 is characterized in that, the test probe that described first solder joint and second solder joint form is fixed on the measurand by adhesive glue.
5. broadband impedance measurement mechanism as claimed in claim 4 is characterized in that, the shape of coaxial cable core wire and adjustable positions on the described test probe.
6. broadband impedance measurement mechanism as claimed in claim 5 is characterized in that, described concentric cable characteristic impedance is even.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100007397A CN100554979C (en) | 2008-01-15 | 2008-01-15 | A kind of broadband impedance measurement mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100007397A CN100554979C (en) | 2008-01-15 | 2008-01-15 | A kind of broadband impedance measurement mechanism |
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| CN101216514A CN101216514A (en) | 2008-07-09 |
| CN100554979C true CN100554979C (en) | 2009-10-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9316677B2 (en) * | 2012-02-29 | 2016-04-19 | Apple Inc. | Devices and methods for testing flex cable shielding |
| CN106526324B (en) * | 2016-11-09 | 2019-03-19 | 南方电网科学研究院有限责任公司 | The impedance operator test device of capacitive apparatus |
| CN111381104A (en) * | 2018-12-29 | 2020-07-07 | 中兴通讯股份有限公司 | Method and device for measuring impedance of transmission channel |
| CN111220851A (en) * | 2019-11-11 | 2020-06-02 | 山西中磁尚善科技有限公司 | Magnetic inductance performance detection method |
| CN111220825B (en) * | 2019-12-05 | 2022-10-04 | 国网重庆市电力公司电力科学研究院 | A connect fixing device for power cable test |
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