CN104569595A - Resistance value detection device and method - Google Patents
Resistance value detection device and method Download PDFInfo
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- CN104569595A CN104569595A CN201310514027.8A CN201310514027A CN104569595A CN 104569595 A CN104569595 A CN 104569595A CN 201310514027 A CN201310514027 A CN 201310514027A CN 104569595 A CN104569595 A CN 104569595A
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title abstract description 16
- 238000005070 sampling Methods 0.000 claims abstract description 94
- 238000006243 chemical reaction Methods 0.000 claims description 41
- 238000004364 calculation method Methods 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
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Abstract
The application discloses a resistance value detection device and method, which are used for sampling the resistance value of a sample to be detected to obtain a corresponding sampling signal; judging whether the resistance value of the tested sample is in a preset range or not according to the sampling signal, and displaying a judgment result; the whole resistance value detection process can be automatically executed by corresponding equipment completely, the workload of workers is greatly reduced, the working efficiency is improved, errors and mistakes caused by human factors are eliminated, and the problems in the prior art are solved. In addition, when resistance detection is carried out on samples with different requirements, only the preset range applied by the judgment control unit needs to be modified correspondingly, and therefore the practicability and universality of the embodiment of the application are high.
Description
Technical Field
The application relates to the technical field of detection, in particular to a resistance value detection device and method.
Background
As a key material of the water tank liner of the water heater, the resistance of the magnesium rod directly determines the actual use reliability of the water tank liner, and the performance of the water heater is influenced, so that the resistance of each magnesium rod needs to be detected in the production process to remove magnesium rod samples with the resistance not meeting the standard. In the prior art, a universal meter is generally adopted to detect the resistance value of the magnesium rod one by one, and the detection result is manually recorded and judged whether the resistance value is in a standard range, so that whether the resistance value of the magnesium rod is qualified is determined; the method has the advantages of large workload and low efficiency, and is easy to cause reading errors, even recording and judging errors, such as resistance value recording errors and the like, caused by human factors.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a resistance value detecting device and method, so as to solve the problems of the prior art, such as large workload, low efficiency, and easy occurrence of errors and even mistakes caused by human factors.
In order to achieve the above purpose, the present application provides the following technical solutions:
a resistance value detection device comprising:
the sampling unit is used for sampling the resistance value of the tested sample and outputting a corresponding sampling signal;
the judgment control unit is used for judging whether the resistance value of the tested sample is in a preset range or not according to the sampling signal;
and the display unit is used for displaying the judgment result of the judgment control unit.
Preferably, the sampling unit comprises a resistance-to-voltage conversion module and an analog-to-digital conversion module;
the resistance-to-voltage conversion module is used for converting the resistance value of the tested sample into corresponding voltage analog quantity and outputting the voltage analog quantity;
the analog-to-digital conversion module is used for performing analog-to-digital conversion on the voltage analog quantity to obtain a corresponding voltage digital quantity, and outputting the voltage digital quantity as the sampling signal.
Preferably, the resistance-to-voltage module comprises an eight-channel resistance-to-voltage module; the analog-to-digital conversion module comprises an eight-channel analog-to-digital conversion module.
Preferably, the determination control unit includes a programmable controller PLC.
Preferably, the determination control means includes:
the calculation module is used for receiving the sampling signal and adjusting the sampling signal to a comparable range according to a preset operation rule;
the comparison module is used for comparing the adjusted sampling signal with the preset range, and outputting a first signal which represents that the resistance value of the tested sample is qualified when the adjusted sampling signal is in the preset range; when the adjusted sampling signal is larger than the upper limit value of the preset range, outputting a second signal representing that the upper limit of the resistance value of the tested sample is unqualified; and when the adjusted sampling signal is smaller than the lower limit value of the preset range, outputting a third signal representing that the lower limit value of the resistance value of the detected sample is unqualified.
Preferably, the display unit includes: a display screen and/or an indicator light.
Preferably, the resistance value detection device further includes a result storage unit for storing the determination result of the determination control unit.
A resistance value detection method comprising:
sampling the resistance value of the tested sample to obtain a corresponding sampling signal;
judging whether the resistance value of the tested sample is in a preset range or not according to the sampling signal;
and displaying the judgment result.
Preferably, the sampling the resistance value of the detected sample to obtain a corresponding sampling signal includes:
converting the resistance value of the tested sample into corresponding voltage analog quantity through a resistance-to-voltage conversion module;
and carrying out analog-to-digital conversion on the voltage analog quantity to obtain a corresponding voltage digital quantity, and taking the voltage digital quantity as the sampling signal.
Preferably, the determining whether the resistance value of the sample to be tested is within a preset range according to the sampling signal includes:
receiving the sampling signal, and adjusting the sampling signal to a comparable range according to a preset operation rule;
comparing the adjusted sampling signal with the preset range, and judging the resistance value of the tested sample according to the comparison result; wherein,
the judging of the resistance value of the tested sample according to the comparison result comprises the following steps:
when the adjusted sampling signal is within the preset range, judging that the resistance value of the tested sample is qualified;
when the adjusted sampling signal is larger than the upper limit value of the preset range, judging that the upper limit of the resistance value of the tested sample is unqualified;
and when the adjusted sampling signal is smaller than the lower limit value of the preset range, judging that the lower limit of the resistance value of the tested sample is unqualified.
According to the technical scheme, the resistance value of the tested sample is sampled to obtain the corresponding sampling signal; judging whether the resistance value of the tested sample is in a preset range or not according to the sampling signal, and displaying a judgment result; the whole resistance value detection process can be automatically executed by corresponding equipment completely, the workload of workers is greatly reduced, the working efficiency is improved, errors and mistakes caused by human factors are eliminated, and the problems in the prior art are solved. In addition, when resistance detection is carried out on samples with different requirements, only the preset range applied by the judgment control unit needs to be modified correspondingly, and therefore the practicability and universality of the embodiment of the application are high.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a resistance value detection device according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a resistance value detection device according to a second embodiment of the present disclosure;
fig. 3 is a block diagram of a resistance value detection device according to a third embodiment of the present application;
fig. 4 is a structural diagram of a resistance value detection apparatus according to an embodiment of the present disclosure;
fig. 5 is a flowchart of a resistance value detection method according to a fourth embodiment of the present application;
fig. 6 is a flowchart of a resistance value detection method according to a fifth embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application discloses a resistance value detection device and method, and aims to solve the problems that in the prior art, the workload is large, the efficiency is low, and errors and even errors caused by human factors are easy to occur.
Referring to fig. 1, a resistance value detection apparatus according to an embodiment of the present application includes a sampling unit 100, a determination control unit 200, and a display unit 300.
Specifically, the sampling unit 100 is configured to sample a resistance value of a sample to be detected and output a corresponding sampling signal; the judging control unit 200 is used for judging whether the resistance value of the tested sample is in a preset range according to the sampling signal; a display unit 300 for displaying the judgment result of the judgment control unit.
According to the structure and the function, the resistance value of the tested sample is sampled through the sampling unit to obtain the corresponding sampling signal; judging whether the resistance value of the tested sample is in a preset range or not by the judging control unit according to the sampling signal, and displaying a judging result by the display unit; therefore, the whole resistance value detection process is completely automatically executed by the device, the workload of workers is greatly reduced, the working efficiency is improved, errors and mistakes caused by human factors are eliminated, and the problems in the prior art are solved. In addition, when resistance detection is carried out on samples with different requirements, only the preset range applied by the judgment control unit needs to be modified correspondingly, and therefore the practicability and universality of the embodiment of the application are high.
The resistance detection device of the embodiment of the application can be powered by the DC24V power module, and is low in power consumption and high in weak current power supply safety.
Preferably, in the second embodiment of the present application, the resistance value of the sample to be tested is sampled by using the resistance-to-voltage conversion module and the analog-to-digital conversion module. Specifically, as shown in fig. 2, the resistance value detection apparatus provided in the second embodiment of the present application includes a sampling unit 100, a determination control unit 200, and a display unit 300.
The sampling unit 100 is configured to sample a resistance value of a sample to be detected and output a corresponding sampling signal; the judging control unit 200 is used for judging whether the resistance value of the tested sample is in a preset range according to the sampling signal; a display unit 300 for displaying the judgment result of the judgment control unit.
Specifically, the sampling unit 100 includes a resistance-to-voltage conversion module 101 and an analog-to-digital conversion module 102.
The resistance-to-voltage conversion module 101 is configured to convert the resistance of the sample to be tested into a corresponding voltage analog quantity and output the voltage analog quantity. The principle is that after a tested sample is connected with the input end of the resistance-to-voltage conversion module 101, the tested sample is equivalently connected into a loop, so that corresponding voltage is generated at two ends of the tested sample, namely, the resistance is converted into the voltage.
The analog-to-digital conversion module 102 is configured to perform analog-to-digital conversion on the voltage analog quantity to obtain a corresponding voltage digital quantity, and output the voltage digital quantity as a sampling signal.
Referring to fig. 3, a third embodiment of the present application provides another resistance value detecting device, which includes a sampling unit 100, a determination control unit 200, and a display unit 300.
Specifically, the sampling unit 100 includes a resistance-to-voltage conversion module 101 and an analog-to-digital conversion module 102.
The resistance-to-voltage conversion module 101 is used for converting the resistance value of the detected sample into a corresponding voltage analog quantity and outputting the voltage analog quantity; the analog-to-digital conversion module 102 is configured to perform analog-to-digital conversion on the voltage analog quantity to obtain a corresponding voltage digital quantity, and output the voltage digital quantity as a sampling signal.
The decision control unit 200 comprises a calculation module 201 and a comparison module 202.
The calculating module 201 is configured to receive the sampling signal and adjust the sampling signal to a comparable range according to a preset operation rule. In practical applications, the absolute value of the sampling signal (i.e. the voltage value corresponding to the resistance value of the sample to be tested) may be large and even exceed the data processing range of the conventional comparison module (i.e. the above comparable range), so that the sampling signal can be preprocessed to adjust the value thereof to be within the comparable range. Or, the voltage digital quantity is converted into the corresponding resistance digital quantity through the preset operation rule, so that the resistance value of the tested sample can be judged visually. For example, the preset operation rule may be: the sampled signal is divided by a predetermined value (e.g., the average current value of the sample being measured).
The comparison module 202 is configured to compare the adjusted sampling signal with the preset range, and output a first signal indicating that the resistance value of the measured sample is qualified when the adjusted sampling signal is within the preset range; when the adjusted sampling signal is larger than the upper limit value of the preset range, outputting a second signal representing that the upper limit of the resistance value of the tested sample is unqualified; and when the adjusted sampling signal is smaller than the lower limit value of the preset range, outputting a third signal representing that the lower limit value of the resistance value of the detected sample is unqualified.
For example, for a magnesium rod used for a water heater liner, when the resistance value is qualified in term, the resistance value should be between 95 ohm and 105 ohm; and when the resistance value corresponding to the sampling signal is larger than 105 ohms, judging that the upper limit of the magnesium rod is unqualified, and when the resistance value is smaller than 95 ohms, judging that the lower limit of the magnesium rod is unqualified.
The comparison module 202 implements the above numerical comparison, and can be implemented by a comparison circuit composed of two operational amplifiers and related auxiliary components; the in-phase input ends of the two operational amplifiers are respectively connected with the adjusted sampling signals, the inverted input end of one operational amplifier is connected with the upper limit value of a preset range and is used for detecting whether the upper limit of the resistance value of the sample to be detected is qualified or not, and if the output signal of the output end of the operational amplifier is a high level (namely, the second signal), the upper limit of the resistance value of the sample to be detected is unqualified; the inverting input end of the other operational amplifier is connected with the lower limit value of the preset range and is used for detecting whether the lower limit value of the resistance value of the sample to be detected is qualified or not, and if the output signal of the output end of the operational amplifier is a low level (namely the third signal), the lower limit value of the resistance value of the sample to be detected is unqualified; meanwhile, the output ends of the two operational amplifiers are respectively connected to an AND gate, and if the output signal of the output end of the AND gate is a low level (namely, the first signal), the resistance value of the sample to be detected is qualified.
The display unit 300 comprises a display screen 301 and/or indicator lights 302.
The display 301 may directly display the corresponding determination result through information such as numbers and characters. The number of indicator lights 302 may be 1 or 3. For the case of 3 LED lights, each indicator light represents a judgment result; for the scheme of adopting 1 LED lamp, different colors can be adopted to represent different judgment results, for example, green represents qualified, red represents unqualified upper limit, and yellow represents unqualified lower limit.
Furthermore, in practical application, the number of signal processing channels of the resistance-to-voltage conversion module 101 and the analog-to-digital conversion module 102 can be multiple, that is, multiple samples to be detected can be sampled simultaneously, and the working efficiency is greatly improved. As shown in fig. 4, the common resistance-to-voltage conversion module 101 includes an eight-channel resistance-to-voltage conversion module 101', each channel operates independently, and can simultaneously convert and output the resistance values of 8 samples to be tested; correspondingly, the analog-to-digital conversion module 102 adopts an eight-channel analog-to-digital conversion module 102', which corresponds to eight signal processing channels of the eight-channel resistance-to-voltage conversion module one by one, and respectively performs analog-to-digital conversion on the voltage analog quantity output by each channel.
It will be appreciated by a person skilled in the art that the decision control unit may also be implemented by a corresponding circuit. The embodiment of the present application is preferably implemented by a Programmable Logic Controller (PLC) capable of processing digital quantity signals, such as the Programmable Logic Controller (PLC) 200' shown in fig. 4, by burning a corresponding program in the PLC, it is implemented to determine whether the resistance value of the sample to be measured is within a preset range according to the sampling signal; the beneficial effects are as follows: as a common device in the control field, the PLC has the advantages of small volume, low cost, good expansibility, low environmental requirement, simple programming, convenient use and the like, so that the device has small volume, low cost and strong universality and is beneficial to popularization and application.
In addition, the resistance value detection device provided by the embodiment of the application further comprises a result storage unit, wherein the result storage unit is used for storing the judgment result of the judgment control unit, so that the follow-up query and the overall quality evaluation of a certain batch of samples are facilitated.
As shown in fig. 5, a fourth embodiment of the present application further provides a resistance value detection method, including the following steps:
s401, sampling the resistance value of the tested sample to obtain a corresponding sampling signal;
s402, judging whether the resistance value of the sample to be detected is in a preset range or not according to the sampling signal;
and S403, displaying the judgment result.
According to the method, the resistance value of the sample to be detected is sampled, and a corresponding sampling signal is obtained; judging whether the resistance value of the tested sample is in a preset range or not according to the sampling signal, and displaying a judgment result; the whole resistance value detection process can be automatically executed by corresponding equipment completely, the workload of workers is greatly reduced, the working efficiency is improved, errors and mistakes caused by human factors are eliminated, and the problems in the prior art are solved. In addition, when resistance detection is carried out on samples with different requirements, only the preset range applied by the judgment control unit needs to be modified correspondingly, and therefore the practicability and universality of the embodiment of the application are high.
Preferably, the fifth embodiment of the present application provides another resistance value detection method; as shown in fig. 6, it includes the following steps:
s501, converting the resistance value of the tested sample into a corresponding voltage analog quantity through a resistance-to-voltage conversion module;
s502, performing analog-to-digital conversion on the voltage analog quantity to obtain a corresponding voltage digital quantity, and taking the voltage digital quantity as a sampling signal;
s503, receiving the sampling signal, and adjusting the sampling signal to a comparable range according to a preset operation rule;
s504, comparing the adjusted sampling signal with a preset range, and judging whether the resistance value of the tested sample is in the preset range according to the comparison result;
specifically, when the adjusted sampling signal is within the preset range, the resistance value of the tested sample is judged to be qualified; when the adjusted sampling signal is larger than the upper limit value of the preset range, judging that the upper limit of the resistance value of the tested sample is unqualified; and when the adjusted sampling signal is smaller than the lower limit value of the preset range, judging that the lower limit of the resistance value of the tested sample is unqualified.
And S505, displaying and storing the judgment result.
Specifically, the judgment result can be displayed through a display screen and/or an indicator light.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the computer program is executed. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A resistance value detection device characterized by comprising:
the sampling unit is used for sampling the resistance value of the tested sample and outputting a corresponding sampling signal;
the judgment control unit is used for judging whether the resistance value of the tested sample is in a preset range or not according to the sampling signal;
and the display unit is used for displaying the judgment result of the judgment control unit.
2. The resistance value detection device according to claim 1, wherein the sampling unit comprises a resistance-to-voltage conversion module and an analog-to-digital conversion module;
the resistance-to-voltage conversion module is used for converting the resistance value of the tested sample into corresponding voltage analog quantity and outputting the voltage analog quantity;
the analog-to-digital conversion module is used for performing analog-to-digital conversion on the voltage analog quantity to obtain a corresponding voltage digital quantity, and outputting the voltage digital quantity as the sampling signal.
3. The resistance value detection device according to claim 2, wherein the resistance to voltage module comprises an eight-channel resistance to voltage module; the analog-to-digital conversion module comprises an eight-channel analog-to-digital conversion module.
4. The resistance value detection device according to any one of claims 1 to 3, wherein the determination control unit includes a Programmable Logic Controller (PLC).
5. The resistance value detection device according to claim 1, wherein the determination control unit includes:
the calculation module is used for receiving the sampling signal and adjusting the sampling signal to a comparable range according to a preset operation rule;
the comparison module is used for comparing the adjusted sampling signal with the preset range, and outputting a first signal which represents that the resistance value of the tested sample is qualified when the adjusted sampling signal is in the preset range; when the adjusted sampling signal is larger than the upper limit value of the preset range, outputting a second signal representing that the upper limit of the resistance value of the tested sample is unqualified; and when the adjusted sampling signal is smaller than the lower limit value of the preset range, outputting a third signal representing that the lower limit value of the resistance value of the detected sample is unqualified.
6. The resistance value detection device according to claim 1, wherein the display unit includes: a display screen and/or an indicator light.
7. The resistance value detecting device according to claim 1, further comprising a result storage unit that stores the determination result of the determination control unit.
8. A resistance value detection method, characterized by comprising:
sampling the resistance value of the tested sample to obtain a corresponding sampling signal;
judging whether the resistance value of the tested sample is in a preset range or not according to the sampling signal;
and displaying the judgment result.
9. The resistance value detection method according to claim 8, wherein the sampling of the resistance value of the sample to be detected to obtain a corresponding sampling signal includes:
converting the resistance value of the tested sample into corresponding voltage analog quantity through a resistance-to-voltage conversion module;
and carrying out analog-to-digital conversion on the voltage analog quantity to obtain a corresponding voltage digital quantity, and taking the voltage digital quantity as the sampling signal.
10. The resistance value detection method according to claim 8 or 9, wherein the determining whether the resistance value of the sample to be detected is within a preset range according to the sampling signal includes:
receiving the sampling signal, and adjusting the sampling signal to a comparable range according to a preset operation rule;
comparing the adjusted sampling signal with the preset range, and judging the resistance value of the tested sample according to the comparison result; wherein,
the judging of the resistance value of the tested sample according to the comparison result comprises the following steps:
when the adjusted sampling signal is within the preset range, judging that the resistance value of the tested sample is qualified;
when the adjusted sampling signal is larger than the upper limit value of the preset range, judging that the upper limit of the resistance value of the tested sample is unqualified;
and when the adjusted sampling signal is smaller than the lower limit value of the preset range, judging that the lower limit of the resistance value of the tested sample is unqualified.
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| CN201310514027.8A CN104569595A (en) | 2013-10-25 | 2013-10-25 | Resistance value detection device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182080A (en) * | 2015-09-09 | 2015-12-23 | 浙江大华技术股份有限公司 | Cable impedance measuring device and method and network device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100271052A1 (en) * | 2009-04-24 | 2010-10-28 | Yazaki Corporation | Disconnection detecting device |
| CN203069672U (en) * | 2013-01-29 | 2013-07-17 | 厦门国毅科技有限公司 | Loop resistance testing system |
| CN203164305U (en) * | 2013-01-18 | 2013-08-28 | 南京民盛电子仪器有限公司 | Grounding resistor testing instrument |
| CN203241475U (en) * | 2013-02-25 | 2013-10-16 | 中国石油化工股份有限公司 | An impedance tester of an acquiring station |
| US20130271165A1 (en) * | 2012-04-16 | 2013-10-17 | Hon Hai Precision Industry Co., Ltd. | Output impedance testing device |
-
2013
- 2013-10-25 CN CN201310514027.8A patent/CN104569595A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100271052A1 (en) * | 2009-04-24 | 2010-10-28 | Yazaki Corporation | Disconnection detecting device |
| US20130271165A1 (en) * | 2012-04-16 | 2013-10-17 | Hon Hai Precision Industry Co., Ltd. | Output impedance testing device |
| CN203164305U (en) * | 2013-01-18 | 2013-08-28 | 南京民盛电子仪器有限公司 | Grounding resistor testing instrument |
| CN203069672U (en) * | 2013-01-29 | 2013-07-17 | 厦门国毅科技有限公司 | Loop resistance testing system |
| CN203241475U (en) * | 2013-02-25 | 2013-10-16 | 中国石油化工股份有限公司 | An impedance tester of an acquiring station |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182080A (en) * | 2015-09-09 | 2015-12-23 | 浙江大华技术股份有限公司 | Cable impedance measuring device and method and network device |
| CN105182080B (en) * | 2015-09-09 | 2018-01-12 | 浙江大华技术股份有限公司 | A kind of apparatus and method and the network equipment for measuring netting twine impedance |
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