CN101533049A - Current radiation transmitting device for measuring cable - Google Patents

Current radiation transmitting device for measuring cable Download PDF

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Publication number
CN101533049A
CN101533049A CN200810239442A CN200810239442A CN101533049A CN 101533049 A CN101533049 A CN 101533049A CN 200810239442 A CN200810239442 A CN 200810239442A CN 200810239442 A CN200810239442 A CN 200810239442A CN 101533049 A CN101533049 A CN 101533049A
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cable
current
radiation
unit
electric current
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CN200810239442A
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CN101533049B (en
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苏东林
刘跃东
吴龙刚
刘焱
孙伟
王玉姣
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Beihang University
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Beihang University
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Abstract

The invention discloses a dipole antenna theory-based current radiation transmitting device for measuring a cable connected between a transmitting device and a receiving device. The current radiation transmitting device comprises a measurement receiver, a PC machine and current calipers. A receiving end of the measurement receiver is connected to an output end of the current calipers through a coaxial line; the current calipers are clamped on the cable; and an output end of the measurement receiver is connected with the PC machine through a GPIB bus. The current radiation transmitting device carries out voltage-current conversion and conditional selection treatment on a measured voltage value VO outputted by the measurement receiver through a cable radiation analysis module in the PC machine, then obtains a common mode current IC in the cable, and finally obtains the radiation strength '*' max of an observation point by analyzing the common mode current IC according to the radiation strength.

Description

A kind of current radiation transmitting device of measuring cable
Technical field
The present invention relates to a kind of device of radiative emission, more particularly say, be meant the device of the radiation that is used to connect cable generation between two equipment being measured based on the dipole antenna theory, this device is applied in the electromagnetic radiation test.
Background technology
Cable is a connection device, makes the requisite important tool of equipment intercommunication.And cable is the principal element that causes electromagnetic compatibility problem in the system.When dragging cable to take off outer on the equipment sometimes, equipment just can pass through EMC test smoothly; When running into the electromagnetic interference (EMI) phenomenon at the scene, as long as cable is pulled up, phenomenon of the failure will disappear.This is to receive efficiently and radiating antenna because cable is one.The radiation problem of cable is one of modal problem in the engineering, and the equipment more than 80% can not all cause owing to the cable radiation by the Radiation Emission test.
Electric current in the cable comprises common mode current I CWith differential-mode current I DTwo kinds.Differential-mode current I DThe useful electric current that needs when being device design, common mode current I CIt is interference current.Because differential-mode current equal and opposite in direction, direction are opposite, the radiated electric field direction that their produce also is opposite, cancels out each other.The direction of common mode current is identical, so the radiated electric field mutual superposition that they produce.In general, the size of current of common mode current is less than the size of current (I of differential-mode current C＜I D), the Radiation Emission E of common mode current then CRadiation Emission E than differential mode electric current DWant big (E CE D).Produce stronger radiation in the space, influence the operate as normal of other equipment in the space.
Summary of the invention
In order to solve the radiation effect that radiation that cable produces when the information transmission of equipment room causes receiving equipment, the present invention propose a kind of based on the dipole antenna theory, be used to measure be connected cable between transmitter and the receiving equipment, current radiation transmitting device.This current radiation transmitting device includes measuring receiver, PC and electric current clamp, the measuring receiver receiving end is connected on the output terminal of electric current clamp by coaxial cable, the electric current clamp are clamped on the cable, and the measuring receiver output terminal is connected with PC by gpib bus.Current radiation transmitting device of the present invention is by the voltage measuring value V of the cable radiation parsing module in the PC to measuring receiver output 0Carry out voltage-to-current conversion and condition and choose the common mode current I that handles in the back acquisition cable C, to common mode current I CResolve the radiation intensity that obtains observation station according to radiation intensity
The present invention is a kind of current radiation transmitting device of measuring cable, includes PC, tested cable, and the two ends of described tested cable are connected with transmitter, receiving equipment, it is characterized in that: also include electric current clamp and measuring receiver; The electric current clamp are installed on the cable, are connected with measuring receiver on the output terminal of electric current clamp, and measuring receiver is connected on the PC by gpib bus;
Be embedded with cable radiation parsing module in the described PC, this cable radiation parsing module includes coaxial cable attenuation compensation unit, electric current and voltage converting unit, condition and chooses unit, radiation intensity resolution unit;
The damping capacity V of the electric current caliper measurements institute corresponding frequency band that coaxial cable attenuation compensation unit is stored in database according to coaxial cable aWith voltage measuring value V 0Addition obtains common mode disturbance voltage V, i.e. V=V a+ V 0
The common mode disturbance voltage V that the electric current and voltage converting unit is used for receiving converts the output of common mode interference electric current I to according to voltage-current conversion relation; It is I=V/Z that voltage-current conversion is closed T
Condition is chosen the unit common mode interference electric current I that receives is carried out filtering according to executive condition one, obtains common mode current I CThen adopting executive condition two to carry out observation station chooses; Executive condition one is λ 〉=10L; Executive condition two is d 〉=10L;
The common mode current I of radiation intensity resolution unit to receiving CAccording to the radiation intensity formula | E → | max = 0.628 I C Lf 0 / d Parsing obtains the radiation intensity of observation station.
The present invention measures the advantage of the current radiation transmitting device of cable: (1) utilizes the conduct electricity flow valuve of cable, calculates the Radiation Emission of cable.(2), make that the measurement of Conduction Interference electric current is simple, can operate by the combination of electric current clamp, measuring receiver and PC (cable radiation parsing module).(3) the cable radiation parsing module that adopts digital means to realize carries out the parsing of radiation intensity in the cable conductive process, the radiation intensity of acquisition Can be applied in the radiation interference of cable.
Description of drawings
Fig. 1 is the structure schematic diagram that the present invention measures the cable radiation intensity.
Fig. 2 is the signal processing structure schematic diagram of cable radiation parsing module of the present invention.
Fig. 3 is the common mode interference current spectrum figure of cable in the embodiment of the invention.
Fig. 4 is the transfer impedance figure of electric current clamp in the embodiment of the invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
The present invention be a kind of based on the dipole antenna theory, be used to measure be connected cable between transmitter and the receiving equipment, current radiation transmitting device.This current radiation transmitting device includes measuring receiver, PC and electric current clamp, the measuring receiver receiving end is connected on the output terminal of electric current clamp by coaxial cable, the electric current clamp are clamped on the cable, and the measuring receiver output terminal is connected with PC by gpib bus.Current radiation transmitting device of the present invention is by the voltage measuring value V of the cable radiation parsing module in the PC to measuring receiver output 0Carry out voltage-to-current conversion and condition and choose the common mode current I that handles in the back acquisition cable C, to common mode current I CResolve the radiation intensity that obtains observation station according to radiation intensity
Referring to shown in Figure 1, the transmission information of transmitter output transfers to the receiving equipment end through cable.In order to measure the common mode current I in the cable C, by the electric current clamp are installed, being connected with measuring receiver on the output terminal of electric current clamp on cable, measuring receiver is connected on the PC by gpib bus.
Measuring receiver is chosen R﹠amp; The ESIB40 type electromagnetic interference measurement, EMI measurement receiver that S company produces.
Be embedded with cable radiation parsing module in this PC, described cable radiation parsing module adopts VC++ language compilation (VC++6.0 of version number).PC is a known computing machine, and its minimalist configuration is: dominant frequency 1.24GB, internal memory 512M, hard disk 10GB, operating system Windows 2000/2003/XP.
Referring to shown in Figure 2, cable radiation parsing module includes coaxial cable attenuation compensation unit, electric current and voltage converting unit, condition and chooses unit, radiation intensity resolution unit;
The damping capacity V of the electric current caliper measurements institute corresponding frequency band that coaxial cable attenuation compensation unit is stored in database according to coaxial cable aWith voltage measuring value V 0Addition obtains common mode disturbance voltage V, i.e. V=V a+ V 0
The common mode disturbance voltage V that the electric current and voltage converting unit is used for receiving converts the output of common mode interference electric current I to according to voltage-current conversion relation;
It is I=V/Z that voltage-current conversion is closed T, Z TThe transfer impedance of expression electric current clamp, unit is Ω;
Condition is chosen the unit common mode interference electric current I that receives is carried out filtering according to executive condition one, obtains common mode current I CThen adopting executive condition two to carry out observation station chooses;
Executive condition one is λ 〉=10L, and λ represents interference current frequency f in the cable 0Pairing wavelength, L represents length of cable.
Executive condition two is d 〉=10L, and d represents the vertical range of observation station to cable, and L represents length of cable.
The common mode current I of radiation intensity resolution unit to receiving CAccording to the radiation intensity formula | E → | max = 0.628 I C Lf 0 / d Parsing obtains the radiation intensity of observation station.
At the radiation intensity formula | E → | max = 0.628 I C Lf 0 / d In,
I CCommon mode current in the expression cable, unit is μ A;
L represents length of cable, and unit is m;
The observation station of representing d arrives the vertical range of cable, and unit is m;
f 0Interference current frequency in the expression cable, unit is MHz;
Figure A200810239442D00062
The radiation intensity of expression observation station, unit is μ V/m.
In the present invention, the current radiation transmitting device of measuring cable records net result, i.e. the radiation intensity of observation station
Figure A200810239442D00063
Should Can be used for characterizing the interference field strength of cable in observation station.
The current radiation transmitting device of measurement cable of the present invention, what receive with measuring receiver is the magnitude of voltage of electric current clamp output, is current value in the cable and the present invention was concerned about, therefore need change, so design the electric current and voltage converting unit is arranged.As the terminal impedance of electric current clamp be 50 Ω then the measurement port impedance of measuring receiver also should be 50 Ω.Yet the transfer impedance of a lot of electric current clamp is a unit with dB Ω, if the numerical value of measuring receiver output at this moment is to be unit with dB μ V, and can be according to I=V/Z TObtain the common mode interference current value.
When equipment and cable thereof are carried out the Electro Magnetic Compatibility radiation test, always require to make the greatest irradiation direction of equipment or cable to aim at test antenna.Whether judgment device meets various military or civilian standards also is whether the greatest irradiation of seeing equipment surpasses required value.Therefore, in the present invention, adopt the radiation intensity formula | E → | max = 0.628 I C Lf 0 / d The radiation intensity of observation station is obtained in parsing.The maximal value of radiation appear at the perpendicular plane of lead on, i.e. observation station position, and radiation intensity is constant when observation station is identical with the cable vertical range.
Embodiment
Adopt to connect each instrument as shown in Figure 1, the electric current clamp are chosen the 9123-1N type radio-frequency current clamp of Solar electronics, inc., and measuring receiver is chosen R﹠amp; The ESIB40 type electromagnetic interference measurement, EMI measurement receiver that S company produces, PC are chosen dominant frequency 2.59GB, internal memory 1G, hard disk 40GB prepackage Windows XP system, the cable radiation parsing module of VC++6.0 language compilation.
The voltage measuring value V of measuring receiver output 0=55.183dB μ V.
Interference current frequency f in the cable 0=48.5kHz (as shown in Figure 3).
The transfer impedance value Z of electric current clamp T=11.1dB Ω (as shown in Figure 4).
Length of cable L=0.56m.
The vertical range d=10m of observation station.
In cable radiation parsing module, resolve the observation station radiation intensity of final output | E → | max = 0.273 μV / m .
From
Figure A200810239442D00073
The cable that adopts between transmitter and receiving equipment has stronger radiation interference as can be seen.In electromagnetic radiation test, by to this
Figure A200810239442D00074
The measures such as gauze screen that the analysis of value can be taked to increase corresponding shielding degree alleviate the interference of cable to transmitter, receiving equipment.

Claims (3)

1, a kind of current radiation transmitting device of measuring cable includes PC, tested cable, and the two ends of described tested cable are connected with transmitter, receiving equipment, it is characterized in that: also include electric current clamp and measuring receiver; The electric current clamp are installed on the cable, are connected with measuring receiver on the output terminal of electric current clamp, and measuring receiver is connected on the PC by gpib bus;
Be embedded with cable radiation parsing module in the described PC, this cable radiation parsing module includes coaxial cable attenuation compensation unit, electric current and voltage converting unit, condition and chooses unit, radiation intensity resolution unit;
The damping capacity V of the electric current caliper measurements institute corresponding frequency band that coaxial cable attenuation compensation unit is stored in database according to coaxial cable aWith voltage measuring value V 0Addition obtains common mode disturbance voltage V, i.e. V=V a+ V 0
The common mode disturbance voltage V that the electric current and voltage converting unit is used for receiving converts the output of common mode interference electric current I to according to the voltage-to-current transformational relation; The voltage-to-current transformational relation is I=V/Z T, Z TThe transfer impedance of expression electric current clamp, unit is Ω;
Condition is chosen the unit common mode interference electric current I that receives is carried out filtering according to executive condition one, obtains common mode current I CThen adopting executive condition two to carry out observation station chooses; Executive condition one is λ 〉=10L, and λ represents interference current frequency f in the cable 0Pairing wavelength, L represents length of cable; Executive condition two is d 〉=10L, and d represents the vertical range of observation station to cable, and L represents length of cable;
The common mode current I of radiation intensity resolution unit to receiving CAccording to the radiation intensity formula | E → | max = 0.628 I C Lf 0 / d Parsing obtains the radiation intensity of observation station; At the radiation intensity formula | E → | max = 0.628 I C Lf 0 / d In, I CCommon mode current in the expression cable, unit is μ A; L represents length of cable, and unit is m; The observation station of representing d arrives the vertical range of cable, and unit is m; f 0Interference current frequency in the expression cable, unit is MHz;
Figure A200810239442C00023
The radiation intensity of expression observation station, unit is μ V/m.
2, the current radiation transmitting device of measurement cable according to claim 1 is characterized in that: described cable radiation parsing module adopts the VC++ language compilation.
3, the current radiation transmitting device of measurement cable according to claim 1 is characterized in that: the radiation intensity of observation station
Figure A200810239442C00024
Should
Figure A200810239442C00025
Can characterize the interference field strength of cable in observation station.
CN2008102394426A 2008-12-10 2008-12-10 Current radiation transmitting device for measuring cable Active CN101533049B (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102636703A (en) * 2012-04-28 2012-08-15 福建星网锐捷网络有限公司 System for measuring common mode radiation
CN102944781A (en) * 2012-11-06 2013-02-27 西安开容电子技术有限责任公司 Miniaturized current test caliper
CN102944757A (en) * 2012-11-23 2013-02-27 中国人民解放军国防科学技术大学 Ambient interference resisting method for testing electromagnetic radiation emission field
CN102944701A (en) * 2012-11-06 2013-02-27 西安开容电子技术有限责任公司 Wide-frequency-band current testing calipers
CN102981086A (en) * 2012-12-10 2013-03-20 江苏省产品质量监督检验研究院 Analysis and measurement method for electromagnetic radiation of voltage driven radiation source
CN103278713A (en) * 2013-04-28 2013-09-04 江苏省产品质量监督检验研究院 Radiation-source pre-estimation and calibration method of current-driven model
CN108089075A (en) * 2017-11-21 2018-05-29 广电计量检测（西安）有限公司 The simulating, verifying test device and its method of a kind of shielded cable
CN109828162A (en) * 2019-03-18 2019-05-31 百度在线网络技术（北京）有限公司 Electromagnetic interference prediction technique and system
CN111722039A (en) * 2020-06-23 2020-09-29 湖南大学 Method and device for calculating coupling interference of cable in shielding cavity to microstrip antenna

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100410673C (en) * 2005-07-01 2008-08-13 淄博威特电气有限公司 Cable failure prefixed point detection method and detection device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102636703A (en) * 2012-04-28 2012-08-15 福建星网锐捷网络有限公司 System for measuring common mode radiation
CN102636703B (en) * 2012-04-28 2014-06-04 福建星网锐捷网络有限公司 System for measuring common mode radiation
CN102944701A (en) * 2012-11-06 2013-02-27 西安开容电子技术有限责任公司 Wide-frequency-band current testing calipers
CN102944781A (en) * 2012-11-06 2013-02-27 西安开容电子技术有限责任公司 Miniaturized current test caliper
CN102944757A (en) * 2012-11-23 2013-02-27 中国人民解放军国防科学技术大学 Ambient interference resisting method for testing electromagnetic radiation emission field
CN102981086A (en) * 2012-12-10 2013-03-20 江苏省产品质量监督检验研究院 Analysis and measurement method for electromagnetic radiation of voltage driven radiation source
CN102981086B (en) * 2012-12-10 2015-05-20 江苏省产品质量监督检验研究院 Analysis and measurement method for electromagnetic radiation of voltage driven radiation source
CN103278713A (en) * 2013-04-28 2013-09-04 江苏省产品质量监督检验研究院 Radiation-source pre-estimation and calibration method of current-driven model
CN108089075A (en) * 2017-11-21 2018-05-29 广电计量检测（西安）有限公司 The simulating, verifying test device and its method of a kind of shielded cable
CN109828162A (en) * 2019-03-18 2019-05-31 百度在线网络技术（北京）有限公司 Electromagnetic interference prediction technique and system
CN109828162B (en) * 2019-03-18 2021-11-26 百度在线网络技术（北京）有限公司 Electromagnetic interference prediction method and system
CN111722039A (en) * 2020-06-23 2020-09-29 湖南大学 Method and device for calculating coupling interference of cable in shielding cavity to microstrip antenna
CN111722039B (en) * 2020-06-23 2021-08-20 湖南大学 Method and device for calculating coupling interference of cable in shielding cavity to microstrip antenna

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