CN204903651U - Current mode cable impedance testing arrangement - Google Patents
Current mode cable impedance testing arrangement Download PDFInfo
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- CN204903651U CN204903651U CN201520708362.6U CN201520708362U CN204903651U CN 204903651 U CN204903651 U CN 204903651U CN 201520708362 U CN201520708362 U CN 201520708362U CN 204903651 U CN204903651 U CN 204903651U
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Abstract
The utility model discloses a current mode cable impedance testing arrangement, including adjustable stationary flow source circuit, shunt, electric current display circuit, voltage display circuit, the utility model has the characteristics of it is rational in infrastructure, convenient to use, live simulation detects actual effect etc to whether the quality that can judge the cable is qualified, thereby can avoid the accident that produces in the product use because of mass defect.
Description
Technical field
The utility model relates to a kind of current mode cable resistance proving installation, specifically, relate to a kind of proving installation whether having core manufacturing defect or core damage for cable, this comprises the test of mass defect of the aspect such as linking formedness of the uniformity coefficient of the sectional area of cable core, the uniformity coefficient of core material and core joint.
Background technology
Cable is the important raw and processed materials of electrical system.The reliability of cable is the important component part of reliability in electrical system.The height of its reliability mainly gets exhausted two aspects, and one is the corresponding requirements whether service condition of cable meets cable, and two is whether cable exists mass defect.Whether the wire used meets the requirement of service condition, can obtain from the databook of cable.But whether cable exists mass defect, must have measuring means.And the resistivity that the mass defect of cable is mainly line skin defective insulation and core is too high.Line skin has damage, can be found, and the resistivity of core is not up to standard by visual examination, then need to adopt corresponding instrument to carry out measuring and just can learn.Multimeter is adopted directly to measure, be difficult to find that core has the mass defect compared with macrolesion, because the measuring current of multimeter is very little, and the resistivity of the core of wire is smaller again, if several bursts of fractures in multiply core, it is less on the impact of resistivity, and the test not easily passing through this small area analysis reflects.Only have the mode by big current, the change in resistance that this is less zooms into voltage signal, just can measure this quality absent.Equally, if to produce the impact of the core resistivity that relatively large deviation produces also less due to the uniformity coefficient of core material therefor and core sectional area uniformity coefficient, also need to go out this deviation by the method for testing aptitude test of big current.
Utility model content
A kind of current mode cable resistance proving installation that the utility model designs to solve the problems of the technologies described above just
The utility model solves the technical scheme that its technical matters adopts:
A kind of current mode cable resistance proving installation, comprises adjustable constant current source circuit, shunt, current display circuit, voltage display circuit; Adjustable constant current source circuit positive terminal is connected with one end of tested cable, and adjustable constant current source circuit negative pole end is connected with shunt one end, and the other end of shunt is connected with the other end of tested cable, forms power test circuit; Current display circuit positive terminal is connected with the positive terminal of shunt, and the negative pole end of negative pole end and shunt that electric current shows method is connected, thus shows the real-time current value of test loop; Voltage display circuit positive terminal is connected with the output cathode end of adjustable constant current source circuit, and voltage display circuit negative pole end is connected with the negative pole end of the output of adjustable constant current source circuit, thus shows the real-time voltage value at test loop cable two ends; Adjustable constant current source circuit forms loop by shunt and external testing cable, increased gradually from zero by the electric current of adjustable constant current source circuit by output loop, the i.e. linear voltage drop producing corresponding millivolt level on shunt, i.e. I/V conversion, voltage signal is sent to the current display circuit be connected with shunt, namely completes the real-time detection display to loop current; Tested cable in main test loop, due to the existence of big current, can fall at its two ends coating-forming voltage, the output voltage of voltage drop and adjustable constant-current source circuit, can be sent to the voltage display circuit be connected with adjustable constant current source circuit output terminal.Thus the display formed output voltage.Then can be calculated the resistance of surveyed cable by shown output voltage and loop current according to Ohm law, then by the length of cable, the resistivity of surveyed cable can be drawn, thus can judge that whether the quality of cable is qualified.
Adopt high-power adjustable constant current source as test source, the test needs of different cross-sectional cable can be met, actually can detect the current capacity of cable, really can find the manufacturing defect of cable, this test effect is be beyond one's reach by the measurement of multimeter resistance grade.
Described a kind of current mode cable resistance proving installation, self shows with electric current without the need to external impressed current table, directly can view real-time current; Without the need to external voltage table but its own band voltage, can directly check the magnitude of voltage that cable produces.In conjunction with electric current display, the resistivity of wire conveniently can be calculated.
1, principle of work
Adjustable constant current source circuit for tested length for L cable provides the maximum current-carrying I corresponding to sectional area and material
t.By this large stream I
ton corresponding wire, U falls in coating-forming voltage
t.This I
tcan be checked by the reometer on device, and regulate electric current adjustment stream potentiometer to set.And the voltage U that phase induced current lower wire produces
tfall and can be checked by the voltage table on device.Then the resistance R on wire is calculated by Ohm law
t.That is:
Ｒ
t＝Ｕ
t/Ｉ
t
Calculate conductor resistance, just can calculate the electricalresistivityρ of surveyed wire, namely
ρ＝Ｒ
t/L
The resistivity calculating wire just can be compared with corresponding standard, can judge wire whether unacceptable product.
2, the feature of device
rational in infrastructure, easy to use.
The utility model assembles, and self is equipped with electric current and voltage display, without the need to external impressed current and voltage table, by the reading of respective value, can draws resistance or the resistivity of cable easily.Have rational in infrastructure, feature easy to use.
actual Simulation, detects actual effect.
The utility model device, the method for testing adopting true big current to simulate, is actually and indirectly the resistance value of cable is amplified, so can detect the less resistance of cable caused by mass defect or the difference of resistivity.This adopts multimeter to be beyond one's reach test effect.So this method of testing has higher actual effect.
test condition is stepless establishes, applied range.
The utility model have employed adjustable type constant-current source as test source, can meet the current requirements of the test of different wire diameter cable.And this electric current can steplessly be arranged.So have widely used feature.
Accompanying drawing explanation
Fig. 1 is a kind of current mode cable resistance of the utility model proving installation theory diagram;
Fig. 2 is a kind of current mode cable resistance of the utility model proving installation application principle figure.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
As shown in Figure 1, a kind of current mode cable resistance proving installation, comprises adjustable constant current source circuit, shunt, current display circuit, voltage display circuit; Adjustable constant current source circuit positive terminal is connected with one end of tested cable, and adjustable constant current source circuit negative pole end is connected with shunt one end, and the other end of shunt is connected with the other end of tested cable, forms power test circuit; Current display circuit positive terminal is connected with the positive terminal of shunt, and the negative pole end of negative pole end and shunt that electric current shows method is connected, thus shows the real-time current value of test loop; Voltage display circuit positive terminal is connected with the output cathode end of adjustable constant current source circuit, and voltage display circuit negative pole end is connected with the negative pole end of the output of adjustable constant current source circuit, thus shows the real-time voltage value at test loop cable two ends; Adjustable constant current source circuit forms loop by shunt and external testing cable, increased gradually from zero by the electric current of adjustable constant current source circuit by output loop, the i.e. linear voltage drop producing corresponding millivolt level on shunt, i.e. I/V conversion, voltage signal is sent to the current display circuit be connected with shunt, namely completes the real-time detection display to loop current; Tested cable in main test loop, due to the existence of big current, can fall at its two ends coating-forming voltage, the output voltage of this voltage drop and adjustable constant-current source circuit, the voltage display circuit be connected with adjustable constant current source circuit output terminal can be sent to, thus the display of fixed paired output voltage.Then can be calculated the resistance of surveyed cable according to Ohm law by shown output voltage and loop current, then by the length of cable, survey the resistivity of cable.Thus can judge that whether the quality of cable is qualified.
Adopt high-power adjustable constant current source as test source, the test needs of different cross-sectional cable can be met, actually can detect the current capacity of cable, really can find the manufacturing defect of cable, this test effect is be beyond one's reach by the measurement of multimeter resistance grade.
Described a kind of current mode cable resistance proving installation, self shows with electric current without the need to external impressed current table, directly can view real-time current; Without the need to external voltage table but its own band voltage, can directly check the magnitude of voltage that cable produces.In conjunction with electric current display, the resistivity of wire conveniently can be calculated.
Core of the present utility model is adjustable constant current source circuit, and it relates generally to the design of the parameter of two aspects, and first is the ability of maximum output current, and this ability determines can the maximum secting area of test lead.Another one parameter is maximum output voltage, and this parameter determines can the maximum length of test lead.So specifically when device realizes, miniwatt type, middle power-type and high-power type can be divided into, also should be carried out corresponding outfit according to practical application.
The utility model is not limited to above-mentioned preferred forms, anyone other any or akin products identical with the utility model drawn under enlightenment of the present utility model, all drops within protection domain of the present utility model.
Claims (2)
1. a current mode cable resistance proving installation, is characterized in that: comprise adjustable constant current source circuit, shunt, current display circuit, voltage display circuit; Adjustable constant current source circuit positive terminal is connected with one end of tested cable, and adjustable constant current source circuit negative pole end is connected with shunt one end, and the other end of shunt is connected with the other end of tested cable, forms power test circuit; Current display circuit positive terminal is connected with the positive terminal of shunt, and the negative pole end of negative pole end and shunt that electric current shows method is connected, thus shows the real-time current value of test loop; Voltage display circuit positive terminal is connected with the output cathode end of adjustable constant current source circuit, and voltage display circuit negative pole end is connected with the negative pole end of the output of adjustable constant current source circuit, thus shows the real-time voltage value at test loop cable two ends; Adjustable constant current source circuit forms loop by shunt and external testing cable, increased gradually from zero by the electric current of adjustable constant current source circuit by output loop, the i.e. linear voltage drop producing corresponding millivolt level on shunt, i.e. I/V conversion, voltage signal is sent to the current display circuit be connected with shunt, namely completes the real-time detection display to loop current; Tested cable in main test loop, due to the existence of big current, can fall at its two ends coating-forming voltage, the output voltage of voltage drop and adjustable constant-current source circuit, and be sent to the voltage display circuit be connected with adjustable constant current source circuit output terminal, thus the display formed output voltage, the resistance of surveyed cable can be calculated by shown output voltage values and loop current value according to Ohm law, thus the resistivity of surveyed cable can be calculated.
2. a kind of current mode cable resistance proving installation according to claim 1, is characterized in that: have employed adjustable constant current source as test source, can meet the test needs of different cross-sectional cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520708362.6U CN204903651U (en) | 2015-09-14 | 2015-09-14 | Current mode cable impedance testing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520708362.6U CN204903651U (en) | 2015-09-14 | 2015-09-14 | Current mode cable impedance testing arrangement |
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| Publication Number | Publication Date |
|---|---|
| CN204903651U true CN204903651U (en) | 2015-12-23 |
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|---|---|---|---|
| CN201520708362.6U Active CN204903651U (en) | 2015-09-14 | 2015-09-14 | Current mode cable impedance testing arrangement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521278A (en) * | 2018-07-18 | 2019-03-26 | 宁波艾思科汽车音响通讯有限公司 | A kind of test fixture and method of coaxial cable internal and external conductor resistance |
| CN111091108A (en) * | 2019-12-24 | 2020-05-01 | 江西太平洋电缆集团有限公司 | Cable resistance detecting system |
| CN116008664A (en) * | 2023-03-28 | 2023-04-25 | 石家庄杰泰特动力能源有限公司 | Impedance detection device for fuel cell controller |
-
2015
- 2015-09-14 CN CN201520708362.6U patent/CN204903651U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521278A (en) * | 2018-07-18 | 2019-03-26 | 宁波艾思科汽车音响通讯有限公司 | A kind of test fixture and method of coaxial cable internal and external conductor resistance |
| CN109521278B (en) * | 2018-07-18 | 2021-04-16 | 宁波艾思科汽车音响通讯有限公司 | Test tool and method for resistance of inner conductor and outer conductor of coaxial cable |
| CN111091108A (en) * | 2019-12-24 | 2020-05-01 | 江西太平洋电缆集团有限公司 | Cable resistance detecting system |
| CN111091108B (en) * | 2019-12-24 | 2020-08-11 | 江西太平洋电缆集团有限公司 | Cable resistance detecting system |
| CN116008664A (en) * | 2023-03-28 | 2023-04-25 | 石家庄杰泰特动力能源有限公司 | Impedance detection device for fuel cell controller |
| CN116008664B (en) * | 2023-03-28 | 2023-08-29 | 石家庄杰泰特动力能源有限公司 | Impedance detection device for fuel cell controller |
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