CN109709420A - A kind of Integral wire cable test method based on vector network analyzer - Google Patents
A kind of Integral wire cable test method based on vector network analyzer Download PDFInfo
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Abstract
The Integral wire cable test method based on vector network analyzer that the present invention provides a kind of, including test macro, test macro includes set of frequency unit, time setting unit, time domain parameter setting unit, DUT measure setup unit, eye diagram measurement setting unit, data processing unit and display unit.Set of frequency unit, time setting unit, time domain parameter setting unit, DUT measure setup unit, eye diagram measurement setting unit and display unit are connected with data processing unit, and time domain parameter setting unit is connected with eye diagram measurement setting unit.The present invention can facilitate user while obtain the frequency domain tests parameters such as S parameter proximal end, far-end cross talk and loss under hybrid guided mode, and the waving maps parameter such as eye figure, delay jitter, impedance, make full use of the existing test of vector network analyzer and collimation technique, facilitate the time domain and frequency domain test index of the real-time line of sight transmission of user, integrated testing mode is greatly improved testing efficiency, saves testing cost.
Description
Technical field
The present invention relates to testing lines fields, and in particular to a kind of Integral wire cable test based on vector network analyzer
Method.
Background technique
With the rapid development of aerospace, weapon manufacturing technology, high speed connecting line, digital cable, high speed number are driven
The transmission rate of word interface etc. is also being continuously improved, the transmission reliability test of various single-ended or difference transmission line, interface etc.
Demand increasingly increases.The integrative solution of transmission cable test at present also compares shortcoming, and major test equipment producer is also just
The test Solution having their own characteristics each is being released successively.The radio frequency dependence test index of transmission line can be divided into frequency domain test index and
Waving map, frequency domain test include crosstalk, insertion loss, return loss etc.；Waving map includes impedance, eye figure, delay jitter
Deng.Because test index includes frequency domain parameter and time domain parameter, no matter based on time domain or based on the testing scheme of frequency domain,
It requires to be additionally provided time-frequency domain conversion functional module, to increase the test function of missing.In waving map solution
The big test bandwidth of oscillograph causes measurement dynamic range small, and frequency domain test index and collimation technique need in addition to increase test
Software just can solve；Vector network analyzer bonus point analysis software pattern is the basic model of frequency domain test solution, this survey
Amount mode can make full use of that the dynamic range of vector network analyzer is big, scanning speed is fast, measurement is accurate and test function
Abundant plurality of advantages, can obtain measured piece measurement result more accurate than time domain solution.
Test Solution based on time domain is often limited to the dynamic range and collimation technique of oscillograph, the company of not can be removed
The error of device introducing is connect, small dynamic range can not obtain accurate test result when the frequency-domain index such as crosstalk are tested；Based on frequency
The test Solution in domain, although can make full use of vector network analyzer Larger Dynamic range and powerful collimation technique,
However additional time domain index test software, usually can not obtain real-time waving map as a result, and operation it is relatively complicated, to ripe
The user for knowing vector network analyzer operation often feels inconvenient, reduces testing efficiency.
Summary of the invention
For disadvantage of the existing technology, the present invention provides a kind of integrated cable based on vector network analyzer
Test method.
The following technical solution is employed by the present invention:
A kind of Integral wire cable test method based on vector network analyzer, including test macro, test macro include
Set of frequency unit, time setting unit, time domain parameter setting unit, DUT measure setup unit, eye diagram measurement setting unit,
Data processing unit and display unit；
Set of frequency unit, time setting unit, time domain parameter setting unit, DUT measure setup unit, eye diagram measurement are set
It sets unit and display unit is connected with data processing unit, time domain parameter setting unit is connected with eye diagram measurement setting unit；
Test method the following steps are included:
Step 1: measured piece connection relationship is arranged according to test macro interface in user, and if desired precise measurement, then measuring
Preceding calling vector network analyzer calibration guide carries out accurate calibration, including the calibration of full dual-port etc. to vector network analyzer,
To remove vector network analyzer measurement error；When executing estimation measured piece length function, system is by calculating maximum reflection point
Location estimation measured piece length；
Step 2: test frequency being determined by set of frequency unit, time range is determined by time setting unit, is not set
It is arranged when setting using system default, and frequency information is modified and is extended；
Step 3: user determines measured piece velocity factor characterisitic parameter by time domain parameter setting unit to obtain accurately
Length measurement；
Step 4: user determines the parameter for needing to measure by DUT measure setup unit: when loss, crosstalk, delay, rising
Between and impedance；
Step 5: data processing unit creates necessary track according to user setting, and final measurement knot is obtained by operation
Fruit；
Step 6: the display processing unit of system increases auxiliary display of information on the screen.
Preferably, the step 2 includes:
Measurement frequency range is arranged by set of frequency unit in user: if measured piece expands to dc point, using humorous
Measurement frequency is arranged in wave mode, and harmonic fashion setting measurement frequency can choose there are three types of mode: on the basis of initial frequency, terminate
On the basis of frequency and step frequency on the basis of three kinds of modes；
When selecting initial frequency as benchmark, if initial frequency is f0, each point frequency relation is fn=n*f0；
Select terminate frequency be benchmark when, if terminations frequency be f1, each dot frequency be fn=n*f1/N, N be overall measurement point
Number；
When selecting step frequency as benchmark, if step frequency is fs, each Frequency point relationship is fn=n*fs；
When user's measured piece can extend to dc point, user is allowed to directly input DC expanding value, otherwise system will adopt
Existing measurement frequency is directly expanded into dc point with interpolation algorithm；Importing from file supports user to select existing snp file,
Frequency, points metrical information in snp is imported into system by system.
Preferably, the step 2 includes:
User determines time range by time setting unit: when user selects automatic setting time domain measurement range, arrow
It measures Network Analyzer and time range is arranged according to the range of ± 1/ frequency stepping；If selection is shown according to range range mode, Yong Huxuan
Select parasang, initial time, terminate the time become starting distance and terminate distance；Selectional restriction in one cycle, is then used
Time range is arranged no more than ± 1/ frequency stepping in family, if not selecting, time of measuring can be arbitrarily arranged in user；Reflection ginseng
Number is converted to impedance format and is automatically converted to impedance format to the reflection parameters track of step response.
Preferably, the step 3 includes:
Time domain parameter setting unit is for being arranged frequency domain data, when being converted to time domain data by fft algorithm, simulates step
The rise time of signal or impulse signal pulse width, the rise time is shorter, and time domain response is more precipitous；
Time domain parameter setting unit includes bandpass mode, rate factor and dielectric constant；
In the case that bandpass mode cannot expand to direct current for measured piece；
Rate factor is that the subduplicate inverse of dielectric constant, rate factor and dielectric constant are set according to tested cable characteristic
It sets, for calculating the physical length of measured piece, moment TDelayThe measured piece physical length calculation formula at place are as follows: LCable=rate because
Sub- * light velocity * TDelay；
If input cable is lost, system adds corresponding loss value on the measured value of each measurement point；
Default time domain measurement result is grouped on 1U, if user changes signal amplitude, measurement result is grouped into user setting
In amplitude.
Preferably, the step 4 includes:
The practical rise time of delay inequality and cable step response between DUT measure setup unit specified measurement cable,
User selects to measure cable delay and the rise time of which port according to subsequent trace list, and delay and time use network
Instrument cursor mode is shown；
System is measured the maximum reflection point of measured piece by maximum time range when estimation measured piece length, according to maximum anti-
Exit point determines actual measurement range to the time of measurement end face, and the Cable delay of system-computed is shown in measured piece delay；
The extension measurement plane of reference calls the port extension function of lattice gauge, it calculates the measurement of user's designated port automatically
The delay and loss of end face expand to the position after calculating for that will measure end face, and what the connectors such as removal fixture introduced prolongs
When error, improve cable measurement accuracy；
Loss test is obtained by the frequency domain reflection coefficient of measurement measured piece, the frequency domain that crosstalk test passes through measurement measured piece
Transmission coefficient obtains；The specified port in interface is subject in loss test and crosstalk test；
Customized track calculation function calls vector network analyzer advanced calculator function, and user is facilitated to input oneself
Operational formula carries out operation to a plurality of measurement trace, to obtain the measurement result after complex calculation；
The connection relationship of measured piece and vector network analyzer port, can help user determine current cable to be tested with
The connection relationship of lattice gauge when difference is chosen, shows that current measured piece is differential configuration, and the parameter created at this time is difference ginseng
Number.
Preferably, the step 5 includes:
The setting of data processing unit reception interface obtains measurement result as a result, according to setting processing user's testing requirement,
Processing step is as follows:
Step 5.1: the mapping relations of specified DUT measure setup unit and vector network analyzer port, on this basis
Create the measurement parameter of corresponding interface；
Step 5.2: calling vector network analyzer automatic port extension function, the extension measurement plane of reference, compensation port is prolonged
When and loss:
Step 5.3: estimation measured piece length: measured piece is led directly to or air open-circuit, and system is using low-limit frequency as frequency steps
Into background scanning is carried out, the frequency domain measurement of measured piece port reflection parameters and straight-through parameter is obtained as a result, frequency domain data is converted
For result in time domain, and the position of amplitude peak response is searched, the results are shown in measured piece delay frame, user can also root
Delay value is inserted according to the estimation of oneself；
Step 5.4: carrying out frequency expansion and amendment: carrying out frequency according to the harmonic wave correcting mode that user specifies when low pass
Frequency amendment；Current extended DC point is obtained according to the D. C. value that user specifies come extension frequency or system automatic interpolation mode；
Step 5.5: determine starting and terminate the time: setting time range is the measured piece length * 2 according to estimation, if by
It surveys part length not estimate or be delayed to be 0, then range=2/ frequency stepping；
Step 5.6: filtering bandwidth when time domain transformation is determined according to specified step rise time or pulse impulse width,
The conversion of frequency domain to time domain is completed by ChirpZ algorithm；
Step 5.7: crosstalk test and loss test automatically according to test port creation transmission, reflection measurement parameter trajectory,
Trace if they are the same has existed, and does not create；
Step 5.8: calculating step rise time and the pulse impulse width of delay or trace between trace.
Preferably, the step 6 includes:
Display processing unit on the basis of lattice gauge current cursor function, increase delay and the step response rise time and
Difference information between trace step response rise time and criteria rise time；Increase crosstalk and loss letter in track title
Breath increases delay positions information on trace.
The invention has the advantages that:
1, perfect testing lines solution is provided on vector network analyzer, user demand is integrated, passes through user
Metrical information is arranged in the angle that can be understood, avoids many users from not understanding vector network analyzer measuring principle and leads to not measure
Problem；The difference of frequency domain and time domain parameter is understood without user, the disposable whole test values for obtaining testing lines improve
Testing efficiency and the easy expenditure of instrument.
2, delay operation, the operation of track step rise time and track rise time and the standard between real-time track are provided
The test function of time difference；
3, test frequency is extended and is corrected: carrying out frequency according to the harmonic wave correcting mode that user specifies when low pass
Frequency amendment；Current extended DC point is obtained according to the D. C. value that user specifies come extension frequency or system automatic interpolation mode；It mentions
High impedance and Time delay measurement precision；
4, the existing function of vector network analyzer is made full use of, the port extension function calibration measurement plane of reference is passed through；It is logical
It crosses existing time domain transformation algorithm and completes the assessment of measured piece length；
5, window directly displays the delay inequality of two traces and the step rise time information of trace, facilitates user to observe and surveys
Measure result.
The present invention can facilitate user while obtain the frequency domain tests such as S parameter proximal end, far-end cross talk and loss under hybrid guided mode
The waving maps parameter such as parameter and eye figure, delay jitter, impedance, make full use of vector network analyzer it is existing test and
Collimation technique, facilitates the time domain and frequency domain test index of the real-time line of sight transmission of user, and integrated testing mode is greatly improved
Testing efficiency saves testing cost, provides better measuring technology for user and supports.
Detailed description of the invention
Fig. 1 is the block diagram of test macro.
Fig. 2 is the operation diagram of set of frequency unit.
Fig. 3 is the operation diagram of time setting unit.
Fig. 4 is the operation diagram of time domain parameter setting unit.
Fig. 5 is the operation diagram of DUT measure setup unit.
Specific embodiment
A specific embodiment of the invention is described further in the following with reference to the drawings and specific embodiments:
With the development of 5G communication and the deep application of all things on earth interconnection concept, the application of the novel transmission lines such as digital cable
More and more extensive, with the raising of transmission rate, the electric performance test of cable is also more and more important.The test index of every kind of cable
Variant, more common test index: transmission delay shake, the bit error rate between cable transmission characteristic and reflection characteristic and cable
Equal measuring signal integralities are more common test indexs.Especially provisions of the Ministry of Information Industry measurement cable attenuation, nearly distal end are gone here and there
It need to be measured using frequency sweep instrument when the indexs such as sound decaying (NEXT and FEXT), structural return loss, and measurement frequency stepping
Want sufficiently small to meet NEXT and FEXT index test demand；And the high-speed cables such as USB3.0 need to carry out the damage of differential parameter
The test such as consumption, crosstalk.Therefore the electrical specifications test of cable mostly uses vector network analysis to realize, four current port vectors
Network Analyzer can provide the S parameter test of hybrid guided mode, and provide fixture and remove the advanced calibration function such as embedding, utilize lattice gauge
Existing capability, testing lines demand is integrated on this basis, proposes a kind of one based on vector network analyzer
Body testing lines method.
In conjunction with Fig. 1 to Fig. 5, a kind of Integral wire cable test method based on vector network analyzer, including test macro,
Test macro includes set of frequency unit, time setting unit, time domain parameter setting unit, DUT measure setup unit, the survey of eye figure
Measure setting unit, data processing unit and display unit；
Set of frequency unit, time setting unit, time domain parameter setting unit, DUT measure setup unit, eye diagram measurement are set
It sets unit and display unit is connected with data processing unit, time domain parameter setting unit is connected with eye diagram measurement setting unit.
Test method the following steps are included:
Step 1: measured piece connection relationship is arranged according to test macro interface in user, and if desired precise measurement, can measure
Preceding calling vector network analyzer calibration guide carries out such as full dual-port to lattice gauge and calibrates accurate calibration, to remove lattice gauge
Measurement error；When executing estimation measured piece length function, system is by calculating maximum reflection point location estimation measured piece length.
Step 2: test frequency being determined by set of frequency unit, time range is determined by time setting unit, is not set
It is arranged when setting using system default, and frequency information is modified and is extended；
Measurement frequency range is arranged by set of frequency unit in user: if measured piece expands to DC, using harmonic wave side
Measurement frequency is arranged in formula, and harmonic fashion setting measurement frequency can choose there are three types of mode: on the basis of initial frequency, terminate frequency
On the basis of and step frequency on the basis of three kinds of modes；
When selecting initial frequency as benchmark, if initial frequency is f0, each point frequency relation is fn=n*f0；
Select terminate frequency be benchmark when, if terminations frequency be f1, each dot frequency be fn=n*f1/N, N be overall measurement point
Number；
When selecting step frequency as benchmark, if step frequency is fs, each Frequency point relationship is fn=n*fs；
When user's measured piece can extend to dc point, user is allowed to directly input DC expanding value, otherwise system will adopt
Existing measurement frequency is directly expanded into dc point with interpolation algorithm；Importing from file supports user to select existing snp file,
Frequency, points metrical information in snp is imported into system by system.
User determines time range by time setting unit: when user selects automatic setting time domain measurement range, arrow
It measures Network Analyzer and time range is arranged according to the range of [- 1/ frequency stepping, 1/ frequency stepping]；If selection is according to range range mode
It has been shown that, user select parasang, initial time, termination time etc. to become starting distance and terminate distance；Selectional restriction is one
In a period, then user setting time range is no more than [- 1/ frequency stepping, 1/ frequency stepping], if not selecting, user can
Time of measuring is arbitrarily arranged；Reflection parameters are converted to impedance format and are automatically converted to resistance to the reflection parameters track of step response
Anti- format.
Step 3: user determines measured piece velocity factor characterisitic parameter by time domain parameter setting unit to obtain accurately
Length measurement；
Time domain parameter setting unit is for being arranged frequency domain data, when being converted to time domain data by fft algorithm, simulates step
The rise time of signal or impulse signal pulse width, the rise time is shorter, and time domain response is more precipitous；
Time domain parameter setting unit includes bandpass mode, rate factor and dielectric constant；
In the case that bandpass mode cannot expand to direct current for measured piece；
Rate factor is that the subduplicate inverse of dielectric constant, rate factor and dielectric constant are set according to tested cable characteristic
It sets, for calculating the physical length of measured piece, TDelayThe physical length calculation formula of moment measured piece are as follows: LCable=rate factor *
Light velocity * TDelay；
If input cable is lost, system adds corresponding loss value on the measured value of each measurement point；
Default time domain measurement result is grouped on 1U, if user changes signal amplitude, measurement result is grouped into user setting
In amplitude.
Step 4: user determines the parameter for needing to measure by DUT measure setup unit: when loss, crosstalk, delay, rising
Between and impedance；
The practical rise time of delay inequality and cable step response between DUT measure setup unit specified measurement cable,
User selects to measure cable delay and the rise time of which port according to subsequent trace list, and delay and time use network
Instrument cursor mode is shown；
System is measured the maximum reflection point of measured piece by maximum time range when estimation measured piece length, according to maximum anti-
Exit point determines actual measurement range to the time of measurement end face, and the Cable delay of system-computed is shown in measured piece delay；
The extension measurement plane of reference calls the port extension function of lattice gauge, it calculates the measurement of user's designated port automatically
The delay and loss of end face expand to the position after calculating for that will measure end face, and what the connectors such as removal fixture introduced prolongs
When error, improve cable measurement accuracy；
Loss test is obtained by the frequency domain reflection coefficient of measurement measured piece, the frequency domain that crosstalk test passes through measurement measured piece
Transmission coefficient obtains；The specified port in interface is subject in loss test and crosstalk test；
Customized track calculation function calls vector network analyzer advanced calculator function, and user is facilitated to input oneself
Operational formula carries out operation to a plurality of measurement trace, to obtain the measurement result after complex calculation；
The connection relationship of measured piece and vector network analyzer port, can help user determine current cable to be tested with
The connection relationship of lattice gauge when difference is chosen, shows that current measured piece is differential configuration, and the parameter created at this time is difference ginseng
Number.
Step 5: data processing unit creates necessary track according to user setting, and final measurement knot is obtained by operation
Fruit；
The setting of data processing unit reception interface obtains measurement result as a result, according to setting processing user's testing requirement,
Processing step is as follows:
Step 5.1: the mapping relations of specified DUT measure setup unit and vector network analyzer port, on this basis
Create the measurement parameter of corresponding interface；
Step 5.2: calling vector network analyzer automatic port extension function, the extension measurement plane of reference, compensation port is prolonged
When and loss:
Step 5.3: estimation measured piece length: measured piece is led directly to or air open-circuit, and system is using low-limit frequency as frequency steps
Into background scanning is carried out, the frequency domain measurement of measured piece port reflection parameters and straight-through parameter is obtained as a result, frequency domain data is converted
For result in time domain, and the position of amplitude peak response is searched, the results are shown in measured piece delay frame, user can also root
Delay value is inserted according to the estimation of oneself；
Step 5.4: carrying out frequency expansion and amendment: carrying out frequency according to the harmonic wave correcting mode that user specifies when low pass
Frequency amendment；Current extended DC point is obtained according to the D. C. value that user specifies come extension frequency or system automatic interpolation mode；
Step 5.5: determine starting and terminate the time: setting time range is the measured piece length * 2 according to estimation, if by
It surveys part length not estimate or be delayed to be 0, then range=2/ frequency stepping；
Step 5.6: filtering bandwidth when time domain transformation is determined according to specified step rise time or pulse impulse width,
The conversion of frequency domain to time domain is completed by ChirpZ algorithm；
Step 5.7: crosstalk test and loss test automatically according to test port creation transmission, reflection measurement parameter trajectory,
Trace if they are the same has existed, then does not create；
Step 5.8: calculating step rise time and the pulse impulse width of delay or trace between trace when necessary.
Step 6: the display processing unit of system increases auxiliary display of information on the screen；
Display processing unit on the basis of lattice gauge current cursor function, increase delay and the step response rise time and
Difference information between trace step response rise time and criteria rise time；Increase crosstalk and loss letter in track title
Breath increases delay positions information on trace.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (7)
1. a kind of Integral wire cable test method based on vector network analyzer, which is characterized in that including test macro, test
System includes that set of frequency unit, time setting unit, time domain parameter setting unit, DUT measure setup unit, eye diagram measurement are set
Set unit, data processing unit and display unit；
Set of frequency unit, time setting unit, time domain parameter setting unit, DUT measure setup unit, eye diagram measurement setting are single
Member and display unit are connected with data processing unit, and time domain parameter setting unit is connected with eye diagram measurement setting unit；
Test method the following steps are included:
Step 1: measured piece connection relationship is arranged according to test macro interface in user, and if desired precise measurement, then adjust before measuring
Accurate calibration is carried out to vector network analyzer with vector network analyzer calibration guide, to remove vector network analyzer measurement
Error；When executing estimation measured piece length function, system is by calculating maximum reflection point location estimation measured piece length；
Step 2: test frequency being determined by set of frequency unit, time range is determined by time setting unit, when being not provided with
It is arranged using system default, and frequency information is modified and is extended；
Step 3: user determines measured piece velocity factor characterisitic parameter by time domain parameter setting unit to obtain accurate length
Measurement result；
Step 4: user is determined by DUT measure setup unit needs the parameter that measures: loss, crosstalk, delay, the rise time and
Impedance；
Step 5: data processing unit creates necessary track according to user setting, and final measurement result is obtained by operation；
Step 6: the display processing unit of system increases auxiliary display of information on the screen.
2. a kind of Integral wire cable test method based on vector network analyzer according to claim 1, feature exist
In the step 2 includes:
Measurement frequency range is arranged by set of frequency unit in user: if measured piece expands to dc point, using harmonic wave side
Measurement frequency is arranged in formula, and harmonic fashion setting measurement frequency can choose there are three types of mode: on the basis of initial frequency, terminate frequency
On the basis of and step frequency on the basis of three kinds of modes；
When selecting initial frequency as benchmark, if initial frequency is f0, each point frequency relation is fn=n*f0；
Select terminate frequency be benchmark when, if terminations frequency be f1, each dot frequency be fn=n*f1/N, N be overall measurement count；
When selecting step frequency as benchmark, if step frequency is fs, each Frequency point relationship is fn=n*fs；
When user's measured piece can extend to dc point, user is allowed to directly input DC expanding value, otherwise system will be using slotting
Existing measurement frequency is directly expanded to dc point by value-based algorithm；Importing from file supports user to select existing snp file, system
Frequency, points metrical information in snp is imported into system.
3. a kind of Integral wire cable test method based on vector network analyzer according to claim 1, feature exist
In the step 2 includes:
User determines time range by time setting unit: when user selects automatic setting time domain measurement range, vector net
Time range is arranged according to the range of ± 1/ frequency stepping in network analyzer；If selection shown according to range range mode, user selection away from
Become with a distance from starting distance and termination from unit, initial time, termination time；In one cycle, then user sets selectional restriction
Time range is set no more than ± 1/ frequency stepping, if not selecting, time of measuring can be arbitrarily arranged in user；Reflection parameters turn
It is changed to impedance format and impedance format is automatically converted to the reflection parameters track of step response.
4. a kind of Integral wire cable test method based on vector network analyzer according to claim 1, feature exist
In the step 3 includes:
Time domain parameter setting unit is for being arranged frequency domain data, when being converted to time domain data by fft algorithm, simulates step signal
Rise time or impulse signal pulse width, the rise time is shorter, and time domain response is more precipitous；
Time domain parameter setting unit includes bandpass mode, rate factor and dielectric constant；
In the case that bandpass mode cannot expand to direct current for measured piece；
Rate factor is the subduplicate inverse of dielectric constant, rate factor and dielectric constant according to tested cable featured configuration, is used
In the physical length for calculating measured piece, time TDelayThe measured piece physical length calculation formula at moment are as follows: LMeasured piece=rate because
Sub- * light velocity * TDelay；
If input cable is lost, system adds corresponding loss value on the measured value of each measurement point；
Default time domain measurement result is grouped on 1U, if user changes signal amplitude, measurement result is grouped into the amplitude of user setting
On.
5. a kind of Integral wire cable test method based on vector network analyzer according to claim 1, feature exist
In the step 4 includes:
The practical rise time of delay inequality and cable step response between DUT measure setup unit specified measurement cable, user
The cable delay for measuring which port and rise time, delay is selected to use lattice gauge light with the time according to subsequent trace list
Mark mode is shown；
System is measured the maximum reflection point of measured piece by maximum time range when estimation measured piece length, according to maximum reflection point
To the time of measurement end face, actual measurement range is determined, the Cable delay of system-computed is shown in measured piece delay；
The extension measurement plane of reference calls the port extension function of lattice gauge, it calculates the measurement end face of user's designated port automatically
Delay and loss, expand to the position after calculating for end face will to be measured, the delay that removal fixture etc. connectors introduce misses
Difference improves cable measurement accuracy；
Loss test is obtained by the frequency domain reflection coefficient of measurement measured piece, the frequency-domain transmission that crosstalk test passes through measurement measured piece
Coefficient obtains；The specified port in interface is subject in loss test and crosstalk test；
Customized track calculation function calls vector network analyzer advanced calculator function, and user is facilitated to input the operation of oneself
Formula carries out operation to a plurality of measurement trace, to obtain the measurement result after complex calculation；
The connection relationship of measured piece and vector network analyzer port can help user to determine current cable and network to be tested
The connection relationship of instrument when difference is chosen, shows that current measured piece is differential configuration, and the parameter created at this time is differential parameter.
6. a kind of Integral wire cable test method based on vector network analyzer according to claim 1, feature exist
In the step 5 includes:
The setting of data processing unit reception interface obtains measurement result, handles as a result, according to setting processing user's testing requirement
Steps are as follows:
Step 5.1: the mapping relations of specified DUT measure setup unit and vector network analyzer port create on this basis
The measurement parameter of corresponding interface；
Step 5.2: call vector network analyzer automatic port extension function, extension measurement the plane of reference, compensation port delay and
Loss:
Step 5.3: estimation measured piece length: measured piece is straight-through or air open-circuit, system using low-limit frequency as frequency stepping into
Row background scanning obtains the frequency domain measurement of measured piece port reflection parameters and straight-through parameter as a result, when frequency domain data is converted to
Field result, and the position of amplitude peak response is searched, the results are shown in measured piece delay frame, user can also be according to certainly
Delay value is inserted in oneself estimation；
Step 5.4: carrying out frequency expansion and amendment: frequency being subjected to frequency according to the harmonic wave correcting mode that user specifies when low pass
Amendment；Current extended DC point is obtained according to the D. C. value that user specifies come extension frequency or system automatic interpolation mode；
Step 5.5: determine starting and terminate the time: setting time range is the measured piece length * 2 according to estimation, if measured piece
Length does not estimate or is delayed to be 0, then range=2/ frequency stepping；
Step 5.6: determining filtering bandwidth when time domain transformation according to specified step rise time or pulse impulse width, pass through
The conversion of ChirpZ algorithm completion frequency domain to time domain；
Step 5.7: crosstalk test and loss test are automatically according to test port creation transmission, reflection measurement parameter trajectory, if phase
Same trace has existed, and does not create；
Step 5.8: calculating step rise time and the pulse impulse width of delay or trace between trace.
7. a kind of Integral wire cable test method based on vector network analyzer according to claim 1, feature exist
In the step 6 includes:
Display processing unit increases delay and step response rise time and trace on the basis of lattice gauge current cursor function
Difference information between step response rise time and criteria rise time；Increase crosstalk and loss information in track title,
Increase delay positions information on trace.
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Cited By (6)
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| CN112946379A (en) * | 2021-01-15 | 2021-06-11 | 中汽研汽车检验中心（天津）有限公司 | Electromagnetic signal injection vehicle-mounted Ethernet wire harness and test method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112422354A (en) * | 2019-08-21 | 2021-02-26 | 富港电子（东莞）有限公司 | Active transmission line performance diagnosis system and method thereof |
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| CN111751627B (en) * | 2020-06-05 | 2022-11-29 | 浙江铖昌科技股份有限公司 | Self-calibration method of vector network analyzer based on ten-term error model |
| CN112946379A (en) * | 2021-01-15 | 2021-06-11 | 中汽研汽车检验中心（天津）有限公司 | Electromagnetic signal injection vehicle-mounted Ethernet wire harness and test method |
| CN113359078A (en) * | 2021-04-28 | 2021-09-07 | 浙江铖昌科技股份有限公司 | Vector network analyzer calibration method based on sixteen-term error model |
| CN113567742A (en) * | 2021-08-09 | 2021-10-29 | 南京派格测控科技有限公司 | Harmonic testing method and device for radio frequency switch |
| CN113567742B (en) * | 2021-08-09 | 2024-05-28 | 南京派格测控科技有限公司 | Harmonic testing method and device for radio frequency switch |
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