CN102213754A - System and method for correcting time-domain reflectormeter - Google Patents
System and method for correcting time-domain reflectormeter Download PDFInfo
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- CN102213754A CN102213754A CN2010101379360A CN201010137936A CN102213754A CN 102213754 A CN102213754 A CN 102213754A CN 2010101379360 A CN2010101379360 A CN 2010101379360A CN 201010137936 A CN201010137936 A CN 201010137936A CN 102213754 A CN102213754 A CN 102213754A
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Abstract
The invention provides a method for correcting a time-domain reflectormeter. According to the method, a cable is used for connecting two channels on the time-domain reflectormeter to a corrector. The method comprises the following steps of: enabling Step Deskew values and Channel Deskew values of the two channels to be zero; acquiring the maximum characteristic impedances measured by the two channels at the same time; acquiring the time of the measured same characteristic impedance of the two channels; judging whether the difference between the two characteristics impedances is within an allowable range; judging whether the difference between the two time is within an allowable range; regulating the Step Deskew value of one of the channels when the difference between the characteristic impedances is beyond the allowable range; and regulating the Channel Deskew value of one of the channels when the difference between the two time is beyond the allowable range. The invention also provides a system for correcting the time-domain reflectormeter. The error between the channels is automatically corrected according to the channel selected by a user.
Description
Technical field
The present invention relates to a kind of surveying instrument corrective system and method, especially a kind of time-domain reflectomer corrective system and method.
Background technology
Time-domain reflectomer is a kind of equipment that is used to test the electronic circuit characteristic.For example, time-domain reflectomer sends a pulse signal on electronic circuit, this pulse signal is during through the circuit of an open circuit, and pulse signal runs into open circuit can be launched and postback sending end, and the pulse signal that time-domain reflectomer receives by analysis calculates the characteristic impedance of this electronic circuit.
Yet, when utilizing time-domain reflectomer to carry out the test of electronic circuit characteristic, because the error of time-domain reflectomer itself as the factors such as mistiming between interchannel mistiming, cable length and pulse signal, may cause accuracy of test to descend.Therefore, very important to the correction of time-domain reflectomer.
Summary of the invention
In view of above content, be necessary to propose a kind of time-domain reflectomer corrective system, it can automatically be proofreaied and correct this interchannel error according to the passage of user's selection.
In addition, also be necessary to propose a kind of time-domain reflectomer bearing calibration, it can automatically be proofreaied and correct this interchannel error according to the passage of user's selection.
A kind of time-domain reflectomer corrective system is used for a time-domain reflectomer is proofreaied and correct.A corrector is connected on the passage of this time-domain reflectomer by cable.This system comprises: judge module is used to judge whether the number that is connected to the passage on the corrector by cable is 2; The passage opening module is used to open the two passes that is connected, and makes it in running order; Parameter is provided with module, is used for the parameter S tep Deskew of the two passes that will be connected and the value of Channel Deskew and makes zero; Measurement module, be used to obtain the two passes of above-mentioned connection in the same default measured maximum characteristic impedance of time point, and behind the cable cutting that will connect above-mentioned two passes and corrector, obtain the time that this two passes measures same preset property impedance; Comparison module, be used for by relatively judging difference between above-mentioned two maximum characteristic impedances of obtaining whether in the characteristic impedance scope of a permission, and by judging that relatively difference between above-mentioned two times of obtaining is whether in the time range of a permission; Parameter adjustment module, be used for when the difference between above-mentioned two maximum characteristic impedances is not in the characteristic impedance scope in described permission, adjust the value of the Step Deskew of one of them passage according to the difference between this maximum characteristic impedance, and when the difference between above-mentioned two times is not in the time range in described permission, adjust the value of the Channel Deskew of one of them passage according to the difference between this time.
A kind of time-domain reflectomer bearing calibration is used for a time-domain reflectomer is proofreaied and correct.This method comprises: (a) be connected to a corrector on the passage of above-mentioned time-domain reflectomer by cable; (b) whether judgement is 2 by the number that cable is connected to the passage on the corrector; (c) under whether the number that is connected to the passage on the corrector by cable is 2 situation, open the two passes that is connected, make it in running order; D) the parameter S tepDeskew of the two passes that connected and the value of Channel Deskew are made zero; (e) obtain the two passes of above-mentioned connection in the measured maximum characteristic impedance of same Preset Time point; (f) by judging that relatively difference between above-mentioned two maximum characteristic impedances of obtaining is whether in the characteristic impedance scope of a permission; (g) when the difference between above-mentioned two maximum characteristic impedances is not in the characteristic impedance scope in described permission, adjust the value of the Step Deskew of one of them passage according to the difference between this maximum characteristic impedance; (h) repeating step (e) is to (g), in the characteristic impedance scope of the difference between two maximum characteristic impedances in described permission; (i) will connect the cable cutting of above-mentioned two passes and corrector; (j) obtain the time that this two passes measures same preset property impedance; (k) by judging that relatively difference between above-mentioned two times of obtaining is whether in the time range of a permission; (l) when the difference between above-mentioned two times is not in the time range in described permission, adjust the value of the Channel Deskew of one of them passage according to the difference between this time; And (m) repeating step (j) to (l), in the time range of the difference between two time in described permission.
Time-domain reflectomer corrective system provided by the present invention and method only need the user to select any two passages to be corrected on the time-domain reflectomer, just can automatically proofread and correct selected interchannel error, reduce error that manual synchronizing causes, improved accuracy.
Description of drawings
Fig. 1 is the system architecture diagram of time-domain reflectomer corrective system of the present invention preferred embodiment.
Fig. 2 is the functional block diagram of time-domain reflectomer corrective system of the present invention preferred embodiment.
Fig. 3 is the method flow diagram of time-domain reflectomer bearing calibration preferred embodiment of the present invention.
The main element symbol description
| Time-domain reflectomer | 1 |
| Display unit | 12 |
| Parameter set unit | 11 |
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10 |
| Computing machine | 2 |
| The time-domain reflectomer |
20 |
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21 |
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22 |
| Corrector | 3 |
| Cable | 4 |
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200 |
| |
201 |
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202 |
| The |
203 |
| Parameter is provided with |
204 |
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205 |
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206 |
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207 |
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208 |
Embodiment
Consulting shown in Figure 1ly, is the system architecture diagram of time-domain reflectomer corrective system 20 preferred embodiments of the present invention.This time-domain reflectomer corrective system 20 be installed in one with computing machine 2 that time-domain reflectomer 1 to be corrected is connected in.This time-domain reflectomer corrective system 20 comprises a plurality of functional modules (describing among following Fig. 2), is used for time-domain reflectomer 1 is carried out parameter correction.
In addition, computing machine 2 also comprises the processing unit 21 that is used for carrying out time-domain reflectomer corrective system 20 each functional module, as central processing unit (central processing unit), and the storage unit 22 that is used for storing time-domain reflectomer corrective system 20 each functional module.
Time-domain reflectomer 1 to be corrected is a kind of equipment that is used to test the electronic circuit characteristic.This time-domain reflectomer 1 comprises a plurality of path 10s, parameter set unit 11, and display unit 12.Described each path 10 is used to transmit pulse signal, and utilizes the reflection measurement characteristic impedance of this pulse signal.Described parameter set unit 11 can show the parameter of being proofreaied and correct, as burst length poor (Step Deskew) and channel time poor (Channel Deskew), before correction with proofread and correct after numerical value.Described display unit 12 is used for display parameter proofread and correct before with proofread and correct after, utilize the display graphics of the characteristic impedance of the physical unit that above-mentioned pulse signal records.
A corrector 3 is connected on any two path 10s of time-domain reflectomer 1 by two cables 4.This corrector 3 is grounding apparatuss, makes two path 10s that connected by cable 4 ground connection.
Consulting shown in Figure 2ly, is the functional block diagram of time-domain reflectomer corrective system 20 preferred embodiments of the present invention.This time-domain reflectomer corrective system 20 comprises initialization module 200, judge module 201, and reminding module 202, passage opening module 203, parameter are provided with module 204, measurement module 205, comparison module 206, parameter adjustment module 207, and display module 208.
Above-mentioned each functional module 200-208 is each program segment of finishing specific function, be more suitable in the implementation of description software in computing machine 2 than software program itself, so the present invention describes with module the description of software program.
Described initialization module 200 is used for initialization time-domain reflectomer 1, makes it return to setting when dispatching from the factory.
Described judge module 201 is used to judge whether the number that is connected to the path 10 on the corrector 3 by cable 4 is 2, and promptly whether corrector 3 connects two passes 10 simultaneously.
Described reminding module 202 is used for sending information not connecting simultaneously under the situation of two passes 10.
Described passage opening module 203 is used to open the two passes 10 that is connected, and makes it in running order.
Described parameter is provided with that module 204 is used for the parameter S tepDeskew of the two passes 10 that will be connected and the value of Channel Deskew all makes zero.
Described measurement module 205 is used to obtain the two passes 10 of above-mentioned connection in the same default measured maximum characteristic impedance of time point, and after the cable 4 that will connect above-mentioned two passes 10 and corrector 3 cuts off, obtain the time that this two passes 10 measures same preset property impedance.
Described comparison module 206 is used for by relatively judging difference between above-mentioned two maximum characteristic impedances of obtaining whether in the characteristic impedance scope of a permission, and by judging that relatively difference between above-mentioned two times of obtaining is whether in the time range of a permission.
Described parameter adjustment module 207 is used for when the difference between above-mentioned two maximum characteristic impedances of obtaining is not in the characteristic impedance scope in described permission, adjust the value of the Step Deskew of one of them path 10 according to the difference between this maximum characteristic impedance, the burst length difference between this two passes 10 is dwindled.If two path 10s that connected comprise first passage and second channel.So,, then adjust the value of the StepDeskew of second channel, it is reduced, perhaps adjust the value of the Step Deskew of first passage, make its increase if the measured characteristic impedance of first passage is big.In addition, this parameter adjustment module 207 also is used for when the difference between above-mentioned two times of obtaining is not in the time range in described permission, adjust the value of the Channel Deskew of one of them path 10 according to the difference between this time, the channel time difference of 10 of this two passes is dwindled.For example,, then adjust the value of the Channel Deskew of second channel, it is reduced, perhaps adjust the value of the Channel Deskew of first passage, make its increase if first passage measures the time weak point of same preset property impedance.
Described display module 208 is used for after all path 10s on the time domain reflectometer 1 have all been proofreaied and correct, and shows to proofread and correct parameter S tep Deskew afterwards and the value of Channel Deskew.
Fig. 3 is the process flow diagram of time-domain reflectomer bearing calibration preferred embodiment of the present invention.
Step S10, initialization module 200 initialization time-domain reflectomers 1 make it return to setting when dispatching from the factory.
The path 10 that step S11, user utilize cable 4 that optional two needs on the time-domain reflectomer 1 are proofreaied and correct is connected on the corrector 3.Described corrector 3 is grounding apparatuss, feasible two path 10 ground connection that connected.
Step S12, judge module 201 judge whether corrector 3 connects two passes 10 simultaneously.If do not connect two passes simultaneously, then flow process enters step S13, and reminding module 202 sends information.Otherwise if connected two passes simultaneously, then flow process enters step S14.
In step S14, passage opening module 203 is opened the two passes 10 that is connected, and makes it in running order.
Step S15, parameter is provided with module 204 the parameter S tepDeskew of the two passes 10 that connected and the value of Channel Deskew is made zero.
Step S16, measurement module 205 obtain the characteristic impedance of the two passes 10 of above-mentioned connection in the measured maximum of same Preset Time point.
Step S17, comparison module 206 is by judging that relatively difference between above-mentioned two maximum characteristic impedances of obtaining is whether in the characteristic impedance scope of a permission.
Step S18, when the difference between above-mentioned two maximum characteristic impedances of obtaining is not in the characteristic impedance scope in described permission, parameter adjustment module 207 is adjusted the value of the Step Deskew of one of them path 10 according to the difference between this maximum characteristic impedance, burst length difference between this two passes 10 is dwindled, and return step S16.If two path 10s that connected comprise first passage and second channel.So,, then adjust the value of the Step Deskew of second channel, it is reduced, perhaps adjust the value of the StepDeskew of first passage, make its increase if the measured characteristic impedance of first passage is big.
Step S19, when in the characteristic impedance scope of difference in described permission between above-mentioned two maximum characteristic impedances of obtaining, reminding module 202 prompting users will connect cable 4 cut-outs of above-mentioned two passes 10 and corrector 3.
Step S20, measurement module 205 obtain the time that this two passes 10 measures same preset property impedance.
Step S21, comparison module 206 is by judging that relatively difference between above-mentioned two times of obtaining is whether in the time range of a permission.
Step S22, when the difference between above-mentioned two times of obtaining is not in the time range in described permission, parameter adjustment module 207 is adjusted the value of the Channel Deskew of one of them path 10 according to the difference between this time, channel time difference between this two passes 10 is dwindled, and return step S20.For example,, then adjust the value of the Channel Deskew of second channel, it is reduced, perhaps adjust the value of the Channel Deskew of first passage, make its increase if first passage measures the time weak point of same preset property impedance.
Step S23, when in the time range of difference in described permission between above-mentioned two times of obtaining, judge module 201 judges whether that other path 10s need to proofread and correct in addition.If have, then flow process is returned step S11.Otherwise as if the path 10 that does not need to proofread and correct, then flow process enters step S24.
In step S24, display module 208 shows proofreaies and correct parameter S tep Deskew afterwards and the value of Channel Deskew.
Claims (10)
1. a time-domain reflectomer corrective system is characterized in that, the passage of a time-domain reflectomer to be measured is connected with a corrector by cable, and this system comprises:
Judge module is used to judge whether the number that is connected to the passage on the corrector by cable is 2;
The passage opening module is used to open the two passes that is connected, and makes it in running order;
Parameter is provided with module, is used for the parameter S tep Deskew of the two passes that will be connected and the value of Channel Deskew and makes zero;
Measurement module, be used to obtain the two passes of above-mentioned connection in the same default measured maximum characteristic impedance of time point, and behind the cable cutting that will connect above-mentioned two passes and corrector, obtain the time that this two passes measures same preset property impedance;
Comparison module, be used for by relatively judging difference between above-mentioned two maximum characteristic impedances of obtaining whether in the characteristic impedance scope of a permission, and by judging that relatively difference between above-mentioned two times of obtaining is whether in the time range of a permission;
Parameter adjustment module, be used for when the difference between above-mentioned two maximum characteristic impedances is not in the characteristic impedance scope in described permission, adjust the value of the Step Deskew of one of them passage according to the difference between this maximum characteristic impedance, burst length difference between this two passes is dwindled, and when the difference between above-mentioned two times is not in the time range in described permission, adjust the value of the Channel Deskew of one of them passage according to the difference between this time, the channel time difference between this two passes is dwindled.
2. time-domain reflectomer corrective system as claimed in claim 1 is characterized in that, this system also comprises:
Initialization module is used for the initialization time-domain reflectomer, makes it return to setting when dispatching from the factory.
3. time-domain reflectomer corrective system as claimed in claim 1 is characterized in that, this system also comprises:
Reminding module, be used for not connecting simultaneously under the situation of two passes, send information, and when in the characteristic impedance scope of difference in described permission between above-mentioned two maximum characteristic impedances of obtaining, prompting will connect the cable cutting of above-mentioned two passes and corrector.
4. time-domain reflectomer corrective system as claimed in claim 1 is characterized in that, described parameter adjustment module is adjusted the Step Deskew value and the Channel Deskew value of one of them passage and carried out according to following steps:
When the measured characteristic impedance of the first passage in two passages is big, adjust the value of the Step Deskew of second channel, it is reduced, perhaps adjust the value of the Step Deskew of first passage, make its increase; And
The time that first passage in two passages measures same preset property impedance is adjusted the value of the Channel Deskew of second channel in short-term, and it is reduced, and perhaps adjusts the value of the Channel Deskew of first passage, makes its increase.
5. time-domain reflectomer corrective system as claimed in claim 1 is characterized in that, this system also comprises:
Display module is used to show parameter S tep Deskew after proofreading and correct and the value of ChannelDeskew.
6. a time-domain reflectomer bearing calibration is characterized in that, this method comprises:
(a) be connected to a corrector on the passage of a time-domain reflectomer to be measured by cable;
(b) whether judgement is 2 by the number that cable is connected to the passage on the corrector;
(c) under the number that is connected to the passage on the corrector by cable is 2 situation, open the two passes that is connected, make it in running order;
(d) the parameter S tep Deskew of the two passes that connected and the value of Channel Deskew are made zero;
(e) obtain the two passes of above-mentioned connection in the measured maximum characteristic impedance of same Preset Time point;
(f) by judging that relatively difference between above-mentioned two maximum characteristic impedances of obtaining is whether in the characteristic impedance scope of a permission;
(g) when the difference between above-mentioned two maximum characteristic impedances is not in the characteristic impedance scope in described permission, adjust the value of the StepDeskew of one of them passage according to the difference between this maximum characteristic impedance, the burst length difference between this two passes is dwindled;
(h) repeating step (e) is to (g), in the characteristic impedance scope of the difference between two maximum characteristic impedances in described permission;
(i) will connect the cable cutting of above-mentioned two passes and corrector;
(j) obtain the time that this two passes measures same preset property impedance;
(k) by judging that relatively difference between above-mentioned two times of obtaining is whether in the time range of a permission;
(l) when the difference between above-mentioned two times is not in the time range in described permission, adjust the value of the Channel Deskew of one of them passage according to the difference between this time, the channel time difference between this two passes is dwindled; And
(m) repeating step (j) is to (l), in the time range of the difference between two time in described permission.
7. time-domain reflectomer bearing calibration as claimed in claim 6 is characterized in that, step (a) this method before also comprises:
The initialization time-domain reflectomer makes it return to setting when dispatching from the factory.
8. time-domain reflectomer bearing calibration as claimed in claim 6 is characterized in that, step (b) this method afterwards also comprises:
Not connecting simultaneously under the situation of two passes, send information.
9. time-domain reflectomer bearing calibration as claimed in claim 6 is characterized in that, the step of the Step Deskew value of described one of them passage of adjustment and Channel Deskew value comprises:
When the measured characteristic impedance of the first passage in two passages is big, adjust the value of the Step Deskew of second channel, it is reduced, perhaps adjust the value of the Step Deskew of first passage, make its increase; And
The time that first passage in two passages measures same preset property impedance is adjusted the value of the Channel Deskew of second channel in short-term, and it is reduced, and perhaps adjusts the value of the Channel Deskew of first passage, makes its increase.
10. time-domain reflectomer bearing calibration as claimed in claim 6 is characterized in that, step (m) this method afterwards also comprises
Show and proofread and correct parameter S tep Deskew afterwards and the value of Channel Deskew.
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| CN2010101379360A CN102213754A (en) | 2010-04-01 | 2010-04-01 | System and method for correcting time-domain reflectormeter |
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| CN2010101379360A CN102213754A (en) | 2010-04-01 | 2010-04-01 | System and method for correcting time-domain reflectormeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111352060A (en) * | 2020-04-01 | 2020-06-30 | 电子科技大学 | Characteristic impedance time domain double reference line calibration method of time domain reflectometer |
| CN111352059A (en) * | 2020-04-01 | 2020-06-30 | 电子科技大学 | Characteristic impedance time domain segmentation calibration method of time domain reflectometer |
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| CN111352060A (en) * | 2020-04-01 | 2020-06-30 | 电子科技大学 | Characteristic impedance time domain double reference line calibration method of time domain reflectometer |
| CN111352059A (en) * | 2020-04-01 | 2020-06-30 | 电子科技大学 | Characteristic impedance time domain segmentation calibration method of time domain reflectometer |
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| US11105879B1 (en) | 2020-04-01 | 2021-08-31 | University Of Electronic Science And Technology Of China | Time-domain segmented calibration method for a characteristic impedance of a time-domain reflectometer |
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Application publication date: 20111012 |