CN107703360A - A kind of impedance test system and method for server complete signal link - Google Patents
A kind of impedance test system and method for server complete signal link Download PDFInfo
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- CN107703360A CN107703360A CN201710834260.2A CN201710834260A CN107703360A CN 107703360 A CN107703360 A CN 107703360A CN 201710834260 A CN201710834260 A CN 201710834260A CN 107703360 A CN107703360 A CN 107703360A
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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
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Abstract
The invention discloses a kind of impedance test system and method for server complete signal link, belong to testing impedance technical field.The impedance test system of the server complete signal link of the present invention is made up of VNA, signal measurement tool, link end board, adapter and mainboard, the mainboard is connected with adapter, adapter is connected with link end board, link end board is connected with signal testing tool, and VNA is connected by cable with signal testing tool.The impedance test system of the server complete signal link of the invention can synchronously complete whole link and cell impedance validation test, saving is extra to look for signal location, puts the manpower needed for surveying, time, it is simple efficient, testing efficiency is improved, there is good application value.
Description
Technical field
The present invention relates to testing impedance technical field, specifically provides a kind of testing impedance system of server complete signal link
System and method.
Background technology
Emergence is quickly grown along with society and economic rapid development, server, in the board design of server,
Signal rate more and more higher, high speed signal are also constantly being lifted to the demand of signal integrity.In the link of server, each portion
Point impedance differences are smaller more to help to maintain signal integrity, but in the server when being directly connected to or pass through between board
When cable connects, it is easy to there is each several part impedance and differ larger phenomenon, cause signal reflex in link can than more serious,
Easily cause signal quality to be deteriorated, cause the performance of server to reduce.Therefore, server master board CPU ends are to high speed hardboard backboard
Between the testing impedance of complete signal link be particularly important.Particularly signal rate it is increasingly faster instantly, it is necessary to
The complete impedance operator of certain link is solved, confirms whether design is qualified with this, it is ensured that server product signal quality.
At present, impedance tube prosecutor formula is veneer or single line management and control, i.e., only tests single pcb board or cable（Unit）Letter
The impedance of number line, then judge whether the impedance operator of whole piece link is qualified, the signal wire resistance of same link between each unit
It is anti-whether to match.The advantages of this method of testing is veneer or the measuring accuracy height of mono signal cable impedance, still, works as link
During comprising multiple units, not only Same Way repeatedly measures, and needs before certain signal wire is surveyed, it is necessary in its schematic diagram
Its position is found, then carries out a survey again.When single board signals layer is more and more and signal wire distribution is more and more intensive, look for a little then
Surveyed using test probe point and just become cumbersome and time consuming, and can only testing single-board or single cable signal impedance, can not
Impedance distortion degree at connector is detected, can not also react the impedance operator of whole link.
The content of the invention
The technical assignment of the present invention is to be directed to above-mentioned problem, there is provided one kind can synchronously complete whole link and unit resistance
Anti- test, save it is extra look for signal line position, save point survey needed for manpower, the time, it is simple efficiently, so as to improve test effect
The impedance test system of the server complete signal link of rate.
Further technical assignment of the invention is to provide a kind of impedance detecting method of server complete signal link.
To achieve the above object, the invention provides following technical scheme：
A kind of impedance test system of server complete signal link, by VNA, signal measurement tool, link end board, switching
Card and mainboard are formed, and the mainboard is connected with adapter, and adapter is connected with link end board, link end board and
Signal testing tool is connected, and VNA is connected by cable with signal testing tool.
The mainboard is server master board.
The VNA（Vector Network Analyzer）That is vector network analyzer.VNA carries truing tool, by even
The cable for meeting VNA and signal testing tool is calibrated, cable one end connect VNA signal input output end mouth, the other end with
The corresponding interface connection of calibration module, is calibrated to cable step by step according to VNA prompting.Cable is calibrated to eliminate
Influence to being tested link impedance.After completing calibration to cable, cable is connected with signal testing tool, will now be detected
The impedance conditions of signal testing tool, impedance reference is provided for signal testing.Then by signal testing tool and signal link end
End plate card interface connects, and finally adjusts VNA, complete signal waveform is included in center Screen, according to each distortion of signal waveform
Position, the identification function in VNA is called to measure the impedance operator of unit in link.
The testing impedance for replacing using in the prior art using signal measurement tool in the present invention is popped one's head in, the signal measurement
Tool has the interface connector of standard, can be connected with link end board interface, due to being all standard interface, signal
Measurement jig can smoothly and absolute matches the end interface for being connected to whole piece signal link, and signal testing tool is by interface
Each link signal line draw, signal wire one end is connected with board interface, and the other end sets a directly plug signal wire to connect
Mouthful, only it need to plug signal wire and switch over can and smoothly be tested.
Signal testing tool is connected to the interface of link end board, adjusts VNA level and numerical value button, makes signal
Waveform is fully displayed in screen.Then, check whether the impedance operator of each board and cable is good, looks into according to waveform situation
See between board and board, between board and cable at connector impedance distort situation, the impedance of whole piece link is judged with this
Whether characteristic is good.
Preferably, the link end board is high speed hardboard backboard.
Preferably, the adapter is connected by signal cable with link end board.
Testing impedance to more accurately complete whole link, it can select two ports of signal cable successively difference
Adapter, link end board are connected, then captures waveform, readings again, both sides test value is averaged.It can also select from clothes
The impedance operator on business device mainboard end surveyor's chain road, crawl waveform, readings, then make from the numerical value with link end board test gained
Average computation, the impedance operator of relatively accurate test link.
A kind of impedance detecting method of server complete signal link, by the way that signal testing tool is connected into link end
The interface of board, and signal testing tool is connected with VNA, VNA horizontally and vertically button is adjusted, makes signal waveform complete
It is shown in entirely in screen, the impedance operator of each board and cable is checked according to waveform situation, is checked between board and board, board
Impedance distorts situation at connector between cable, thus judges the impedance operator of whole piece link.
Preferably, methods described specifically includes following steps：
S1：Prepare linking element to be tested：Mainboard, adapter, signal cable, link end board and signal testing tool；
S2：VNA is started shooting, cable is calibrated；
S3：Signal testing tool is connected respectively with link end board interface, VNA；
S4：Adjust VNA, so as to get waveform be completely shown in center Screen；
S5：VNA identification functions are called, check the impedance value of simultaneously wave recording respective links each unit；
S6：Conversion testing start-stop position, is retested, and is checked again and is recorded the impedance value of respective links each unit；
S7：Impedance value according to obtained by step S5, S6 makees average value computing, obtains the impedance value of each section of waveform, completes whole piece chain
The testing impedance on road.
In step S6, select two ports of signal cable successively connecting adapter, link end board respectively, then
Waveform, readings are captured again, and both sides test value is averaged.Reselection captures from the impedance operator on server master board end surveyor's chain road
Waveform, readings, then make average computation from the numerical value with link end board test gained, relatively accurate test link
Impedance operator.
Preferably, the link end board is high speed hard-disk backboard.
Compared with prior art, the impedance test system of server complete signal link of the invention has following prominent
Beneficial effect：The impedance test system of the server complete signal link uses signal testing tool, and signal testing tool can
With smooth and absolute matches the end interface for being connected to whole piece signal link, and signal testing tool is by each link of interface
Signal wire is drawn, and only need to be plugged signal wire and is switched over can and smoothly be tested, and saves the manpower needed for test, and
Testing efficiency is improved, there is good application value.
Brief description of the drawings
Fig. 1 is the schematic diagram of the impedance test system of server complete signal link of the present invention；
Fig. 2 is the waveform diagram of the test result of the impedance test system of server complete signal link of the present invention.
Embodiment
Below in conjunction with drawings and examples, impedance test system and side to the server complete signal link of the present invention
Method is described in further detail.
Embodiment
As shown in figure 1, the impedance test system of the server complete signal link of the present invention, is controlled by VNA, signal measurement
Tool, high speed hard-disk backboard, adapter and server master board are formed.
Server master board is connected with adapter, and adapter is connected by signal cable with high speed hard-disk backboard.At a high speed
Hard disk backboard is connected with signal testing tool, and signal testing tool is connected by cable with VNA.
The impedance detecting method of the server complete signal link of the present invention, first to connection VNA and signal measurement tool
Cable be corrected, cable one end connects VNA signal input output end mouth, and the corresponding interface of the other end and calibration module connects
Connect, cable is calibrated step by step according to VNA prompting.Cable is calibrated to eliminate the shadow to being tested link impedance
Ring.After the completion of calibration, cable is connected with signal testing tool, will now detect the impedance conditions of signal testing tool,
Impedance reference is provided for signal testing.Then signal testing tool is connected with high speed hard-disk backboard, finally adjusts VNA level
With numerical value button, signal waveform is set to be fully displayed in screen, as shown in Figure 2.Then, according to waveform situation check each board with
And whether the impedance operator of cable is good, checks between board and board, impedance distortion feelings at connector between board and cable
Shape, judge whether the impedance operator of whole piece link is good with this.
In order to more accurately complete the testing impedance of whole link, can select two ports of signal cable successively difference
Adapter, link end board are connected, then captures waveform, readings again, both sides test value is averaged.It can also select from clothes
The impedance operator on business device mainboard end surveyor's chain road, crawl waveform, readings, then make from the numerical value with link end board test gained
Average computation, the impedance operator of relatively accurate test link.
Embodiment described above, it is the present invention more preferably embodiment, those skilled in the art is at this
The usual variations and alternatives carried out in the range of inventive technique scheme should all include within the scope of the present invention.
Claims (6)
- A kind of 1. impedance test system of server complete signal link, it is characterised in that：By VNA, signal measurement tool, link End board, adapter and mainboard are formed, and the mainboard is connected with adapter, and adapter is connected with link end board, Link end board is connected with signal testing tool, and VNA is connected by cable with signal testing tool.
- 2. the impedance test system of server complete signal link according to claim 1, it is characterised in that：The link End board is high speed hardboard backboard.
- 3. the impedance test system of server complete signal link according to claim 1 or 2, it is characterised in that：It is described Adapter is connected by signal cable with link end board.
- A kind of 4. impedance detecting method of server complete signal link, it is characterised in that：Signal testing tool is connected to chain The interface of road end board, and signal testing tool is connected with VNA, VNA horizontally and vertically button is adjusted, makes signal Waveform is fully displayed in screen, and the impedance operator of each board and cable is checked according to waveform situation, check board and board it Between, impedance distortion situation at connector between board and cable, thus judge the impedance operator of whole piece link.
- 5. the impedance detecting method of server complete signal link according to claim 4, it is characterised in that：Methods described Specifically include following steps：S1：Prepare linking element to be tested：Mainboard, adapter, signal cable, link end board and signal testing tool；S2：VNA is started shooting, cable is calibrated；S3：Signal testing tool is connected respectively with link end board interface, VNA；S4：Adjust VNA, so as to get waveform be completely shown in center Screen；S5：VNA identification functions are called, check the impedance value of simultaneously wave recording respective links each unit；S6：Conversion testing start-stop position, is retested, and is checked again and is recorded the impedance value of respective links each unit；S7：Impedance value according to obtained by step S5, S6 makees average value computing, obtains the impedance value of each section of waveform, completes whole piece chain The testing impedance on road.
- 6. the method for testing of the server complete signal link impedance according to claim 4 or 5, it is characterised in that：It is described Link end board is high speed hard-disk backboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710834260.2A CN107703360A (en) | 2017-09-15 | 2017-09-15 | A kind of impedance test system and method for server complete signal link |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710834260.2A CN107703360A (en) | 2017-09-15 | 2017-09-15 | A kind of impedance test system and method for server complete signal link |
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| CN107703360A true CN107703360A (en) | 2018-02-16 |
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| CN201710834260.2A Pending CN107703360A (en) | 2017-09-15 | 2017-09-15 | A kind of impedance test system and method for server complete signal link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594018A (en) * | 2018-05-24 | 2018-09-28 | 郑州云海信息技术有限公司 | The method and system of usb signal line characteristic impedance in a kind of test board |
| CN108829550A (en) * | 2018-06-01 | 2018-11-16 | 曙光信息产业(北京)有限公司 | The test fixture of AMD platform |
| CN115118352A (en) * | 2022-08-29 | 2022-09-27 | 南京联实电子有限公司 | High-precision calibration method suitable for terminal test fixture |
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| CN105675990A (en) * | 2016-01-01 | 2016-06-15 | 广州兴森快捷电路科技有限公司 | Link impedance test method for multi-layer interconnection circuit board |
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| CN101667150A (en) * | 2009-09-04 | 2010-03-10 | 浪潮电子信息产业股份有限公司 | SATA signal testing method based on storage subsystem |
| US20150331016A1 (en) * | 2014-05-19 | 2015-11-19 | Honeywell International Inc. | Systems and methods that allow for simultaneous sensor and signal conditioning circuit performance testing |
| CN104618185A (en) * | 2015-01-29 | 2015-05-13 | 曙光云计算技术有限公司 | Link testing method and device |
| CN105137196A (en) * | 2015-08-25 | 2015-12-09 | 浪潮电子信息产业股份有限公司 | Simple SAS and SATA signal routing impedance test method |
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| CN108594018A (en) * | 2018-05-24 | 2018-09-28 | 郑州云海信息技术有限公司 | The method and system of usb signal line characteristic impedance in a kind of test board |
| CN108829550A (en) * | 2018-06-01 | 2018-11-16 | 曙光信息产业(北京)有限公司 | The test fixture of AMD platform |
| CN115118352A (en) * | 2022-08-29 | 2022-09-27 | 南京联实电子有限公司 | High-precision calibration method suitable for terminal test fixture |
| CN115118352B (en) * | 2022-08-29 | 2022-11-01 | 南京联实电子有限公司 | High-precision calibration method suitable for terminal test fixture |
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Application publication date: 20180216 |