CN100381829C - Electromagnetic detector for electromagnetic compatible diagnostic test in vehicle - Google Patents
Electromagnetic detector for electromagnetic compatible diagnostic test in vehicle Download PDFInfo
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- CN100381829C CN100381829C CNB2005100317281A CN200510031728A CN100381829C CN 100381829 C CN100381829 C CN 100381829C CN B2005100317281 A CNB2005100317281 A CN B2005100317281A CN 200510031728 A CN200510031728 A CN 200510031728A CN 100381829 C CN100381829 C CN 100381829C
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Abstract
The present invention relates to an electromagnetic detector for electromagnetic compatible diagnostic test in a vehicle. A detecting body is provided with an electric field probe and a magnetic field probe, wherein the electric field probe and the magnetic field probe are respectively and electrically connected with a low noise amplifier by an adapter. The present invention aims to solve the problems that a dipole antenna of the existing straight has low gain, the radiation impedance of a single dipole antenna is not large enough, the existing electromagnetic compatible detecting device is not suitable for near-field diagnostic test, etc. The present invention uses a technical scheme of respectively using probes with different structural forms for solving the problems. Thus, the present invention has the functions of looking for, isolating and strongly eliminating electromagnetic interference, has the advantages of portability, high detecting sensitivity and strong space resolving power, can carry out near-field detection for radiation signals, can distinguish 'hot points' from a printed circuit board, a cable and an electronic assembly, can determine the position and the radiation intensity of a radiation source, and has high measurable repeatability. Therefore, the present invention is suitable for diagnosing the leakage on each component, a screening casing, etc. of an electronic circuit, etc. and the radiation emission of a similar electromagnetic interference source, and can also be connected with a computer by an EMI test receiver.
Description
Technical field
The present invention relates to a kind of electromagnetic compatibility detection device, particularly a kind of electromagnetic probe of electromagnetic compatible diagnostic test in vehicle.
Background technology
Electromagnetic wave is at all times in daily life, do not have to carve and do not exist, see electromagnetic wave from physical angle, it is a kind of motion morphology of electromagnetic field, electricity can generate magnetic, and magnetic also can bring electricity, and the electric field of variation and the magnetic field of variation have constituted an inseparable unified field, be electromagnetic field, and the propagation of electromagnetic field in the space that changes formed electromagnetic wave.Multi-form electromagnetic wave, though theirs is essential identical, its wavelength and frequency have very big difference, this just gives the inhibition of electromagnetic interference (EMI) and prevents to have brought certain difficulty.Electromagnetic compatibility (EMC) is meant electric and electronic equipment can be carried out the coexisting state of function separately in common electromagnetic environment, promptly requires the above-mentioned various device in same electromagnetic environment operate as normal not disturb mutually again, reaches " compatibility " state.Along with various electronic equipments, photoelectricity, computing machine, communication and information processing kind equipment are at vehicle interior, as at panzer, being extensive use of in many special vehicles such as railway locomotive, higher supporting requirement has also been proposed the various electric and Electromagnetic Compatibility of Power Electronics that is applied to these vehicle interiors thereupon, add the complicated of vehicle interior application electromagnetic environment, and the Electro Magnetic Compatibility that relates to vehicle interior one of integral important technology index when having become vehicle and paying, if not on the circuit design of the various electric and electronic equipment that is used for vehicle interior in taking the effective technology measure aspect the Electro Magnetic Compatibility, will have a strong impact on the normal operation of vehicle interior and system, and even it is influence being delivered for use of whole vehicle, so more and more higher to the designing requirement of vehicle interior Electro Magnetic Compatibility.
At the trial-production or the initial stage of development of vehicle, by EMI diagnosis (being the EMC pretest), the problem in can finding early to design, it neither needs harsh test condition, also avoided the difficulty of purchasing expensive testing apparatus, so it has great vitality.Though most emc issue can be resolved by suitable technical design scheme, but some emc issue must by test to emc issue fix a point, qualitative, quantitative check and analysis, improve design targetedly according to test result again, could solve the emc issue of total system preferably.The EMC pretest is still important means of testing in the development and production of whole vehicle, can in time check the EMC design of vehicle interior whether reasonable, whether the EMI braking measure of being taked proves effective, and the designer is understood as early as possible will further suppress to disturb and need start with from which link.So, find out the problem that is present in basic circuit and the components and parts thereof quickly, the cycle of product development is shortened greatly, cost reduces, and can save great amount of manpower, financial resource.But the existing device structure complexity that is used for quick diagnostic base components and parts emc issue, cost an arm and a leg, be not easy to popularize.Moreover, because the restriction of the special and working environment of vehicle interior structure, at the electromagnetic compatibility detection testing equipment of the impossible employing standard of vehicle interior.Therefore, develop a kind of vehicle interior electromagnetic environment assessment test that is applicable to, (device that the index of 10KHz～1GHz) detects is necessary to launch RE102 to electromagnetic field radiation.
Summary of the invention
At above-mentioned situation, the purpose of this invention is to provide a kind of electromagnetic probe that is used for electromagnetic compatible diagnostic test in vehicle, whether it has to reach to distinguish through the coupling of distributed capacitance according to the electromagnetic wave propagation direction or with electromagnetic field radiation source frequency signal and exists on the electronic circuit above the radiation signal of Electro Magnetic Compatibility standard code and structure not only simply but also be easy to carry and can also use with the electromagnetic compatibility detection matched with devices.
To achieve these goals, a kind of electromagnetic probe of electromagnetic compatible diagnostic test in vehicle, this detector comprises surveys body, adapter, low noise amplifier, wherein surveys body and is provided with electric field probe and magnet field probe, and they are electrically connected with low noise amplifier through adapter respectively.
For implementation structure optimization with reach comparatively ideal usability, its further step is:
Described electric field probe includes body, conductor, is twining directly fixing described conductor on described conductor or the described body on the described body.
Described body is an insulation rod, and the described conductor that is wrapped on this insulation rod is one 50 Ω concentric cable.
Described conductor is to be bifilar helix to be wrapped on the described insulation rod, and bifilar helix is wound up as the two-wire winding of inverse clock, varying pitch.
Described body is the center conductor of one 50 Ω concentric cable, and the described conductor that directly is fixed on this center conductor is a Metal Ball, and the diameter of described Metal Ball is 3.2cm.
Described magnet field probe comprises body, conductor, and its conductor is postponed into described body after curving annular open circle from the middle section, opens a breach on the outer conductor of this body and described annular open circle corner.
Described conductor is 50 Ω semi-rigid coaxial cables, and described breach is the symmetry breach.
The optimum diameter of described annular open circle is 1～6cm, and in the mid-FERRITE CORE of the annular open circle of diameter 1cm.
Described adapter comprises impedance matching network, concentric cable and BNC connector.
Described low noise amplifier comprises integrated amplifier SL560C, by the amplitude limiter circuit that diode D1～D6 forms, and power supply power supply and indicating circuit that IC2 and peripheral electron element are formed.
It is low to the present invention is directed to existing linear dipole antennas gain, the enough big and not existing electromagnetic compatibility detection device of single dipole antenna radiation impedance is unsuitable for problems such as near-field diagnostic test, the technical scheme that adopts the probe of different structure form to be solved respectively, make the present invention have searching, isolated and remove the function of electromagnetic interference (EMI) and simple in structure than forced-ventilated, be convenient for carrying, the detection sensitivity height, spatial resolving power is strong, can reach radiation signal is carried out near-field detection and distinguishes printed circuit board, " focus " on cable and the electronic package, the position and the radiation intensity of radiation source be can determine according to electromagnetic wave propagation direction and energy, bigger components and parts of radiation or circuit investigated out; The position and the radiation intensity of radiation source be can determine according to the electromagnetic wave propagation direction, bigger components and parts of radiation or circuit investigated out, can be isolated to about 1cm interference source
2Scope in; But measuring repeatability height.Be applicable on the diagnosis electronic circuit leakage on each components and parts, printed circuit board, integrated circuit, cable, screening can and the similar Radiation Emission of electromagnetic interference source, its detected electromagnetic interference signal also can be connected with computing machine by the EMI test receiver and carries out diagnostic analysis.
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 (a-1) (a-2) (b-1) is electric field probe structural principle of the present invention and profile synoptic diagram (b-2).
Fig. 3 is magnet field probe structural principle of the present invention and profile synoptic diagram.
Fig. 4 is a low noise amplifier schematic diagram of the present invention.
Fig. 5 (a) be the wound form electric field probe with the screw axis vertical plane in maximum receive direction synoptic diagram.
Fig. 5 (b) is that the wound form electric field probe contains the maximum receive direction synoptic diagram in the screw axis plane.
Fig. 6 is the fundamental diagram of magnet field probe of the present invention.
Fig. 7 is a wound form electric field probe coefficient spectrogram of the present invention.
Fig. 8 is a Metal Ball formula electric field probe coefficient spectrogram of the present invention.
Fig. 9 is a 1cm diameter annular open circle magnet field probe coefficient spectrogram of the present invention.
Figure 10 is a 6cm diameter annular open circle magnet field probe coefficient spectrogram of the present invention.
Figure 11 is that the present invention is used for vehicle interior radiation emission test layout synoptic diagram.
Figure 12 is that the present invention is used for the desk-top test arrangement synoptic diagram of Radiation Emission.
Figure 13 is the leak-testing synoptic diagram that the present invention is used for plug connector or shielded cable.
Figure 14 is the leakage synoptic diagram that the present invention is used to seek shield and electric pad centre joint crack.
Figure 15 is the synoptic diagram that the present invention is used to seek the electromagnetic interference source of circuit board.
Figure 16 is that the present invention is used for local sensitivity degree test synoptic diagram.
Embodiment
As shown in drawings, see Fig. 1, a kind of electromagnetic probe of electromagnetic compatible diagnostic test in vehicle, this detector comprise surveys body A, adapter B, low noise amplifier C, wherein survey body A and be provided with electric field probe and magnet field probe, they are electrically connected with low noise amplifier C through adapter B respectively.
Electric field probe includes the adapter of body, conductor and electrical connection, wherein body 1 is an insulation rod 1, the conductor 2 that is wrapped on this insulation rod 1 is a concentric cable, and this conductor 2 is to be bifilar helix to be wrapped on the insulation rod 1, and the two-wire that this bifilar helix is wound up as inverse clock, varying pitch twines.Equally, wherein body 7 is the center conductor 7 of a concentric cable, and the conductor 6 that directly is fixed on this center conductor 7 is a Metal Ball 6, and the diameter of this Metal Ball 6 is 3.2cm.In order to strengthen Effect on Detecting, convenience is connected with low noise amplifier or EMI test receiver, and adapter comprises impedance matching network 3,50 Ω semi-rigid coaxial cables 4 and BNC connector 5.
Magnet field probe comprises body, conductor, wherein conductor 10 is one 50 Ω semi-rigid coaxial cable, this concentric cable is postponed into described body 12 after curving annular open circle 10 from the middle section, on the outer conductor of this body 12 and annular open circle 10 corners, open a breach 11, this breach 11 can guarantee to have electric shield effect preferably, in order to make measurement that higher repeatability can be arranged, open the both sides of breach 11 very symmetrical, the electric field signal that then is coupled on the inner wire is cancelled out each other, annular probe with electric shield effect receives only magnetic component, and the repeatability of measuring improves greatly.In order to strengthen Effect on Detecting, the big I of annular open circle 10 is according to using needs to determine its diameter, and the optimum diameter of annular open circle 10 is 1～6cm scope.In order to reach further result of use, present embodiment is placed a FERRITE CORE at annular open circle 10 centers of 1cm diameter, has obviously improved the sensitivity of probe.With the adapter that body 12 is electrically connected, it comprises impedance matching network 3, concentric cable 4 and BNC connector 5, and for convenience with being connected of low noise amplifier or EMI test receiver, the output impedance match settings of the impedance matching network 3 of present embodiment is 50 Ω.
Principle of work of the present invention:
In conjunction with the accompanying drawings 2, accompanying drawing 5 as can be known, Fig. 2 (a-1), (a-2) are wound form sonde configuration principle of the present invention and profile synoptic diagram, Fig. 2 (b-1), (b-2) they are Metal Ball formula sonde configuration principle of the present invention and profile synoptic diagram.In order to improve the ratio of gains, the wound form probe of present embodiment is to be folded in half into the two-wire inverse clock by a conductor 2 to be wrapped on the rod insulation rod 1, and the pitch during coiling changes, conductor 2 is connected on the BNC connector 5 through impedance matching network 3,50 Ω semi-rigid coaxial cables 4, thereby eliminated the closed-loop path that exists electric current to flow, so can only pick up electric component; And the two-wire inverse clock twines, 180 ° of feeding point phase differential, and its ratio of gains is single around the spiral height.The coiling of double wrap spiral inverse clock, the direction that produces linear polarization is more much smaller than wavelength because of its screw diameter, so it is a normal direction mould spiral antenna, maximum receive direction is in the plane vertical with screw axis, and the directional diagram in this plane is a circle, shown in Fig. 5 (a), and the directional diagram in containing the screw axis plane is a ∞ font, shown in Fig. 5 (b).Because the phase speed ratio linear dipole antennas that electromagnetic wave is propagated along spiral is little, so its resonance length can shorten, compares with the single dipole antenna of same length, its radiation impedance is much bigger.The Metal Ball 6 that the Metal Ball formula of present embodiment probe is 3.2cm by one 50 Ω semi-rigid coaxial cable 4 and diameter is formed, the center conductor 7 of coaxial cable joins with the ball 6 of 3.2cm, Metal Ball 6 is as the detection body that picks up electric field component, owing to there is not the closed-loop path, so can suppress magnetic component, pick up electric field component effectively.Impedance matching network 3 among Fig. 2 is used for the output impedance of probe is mated at 50 Ω, so that be connected with low noise amplifier or EMI test receiver.
In conjunction with the accompanying drawings 3, accompanying drawing 6 as can be known, the voltage of responding on the magnet field probe of the present invention comprises by two parts and forming: a part is based on Faraday's electromagnetic induction law and produces.The output voltage of a closed conductor loops is directly proportional with the time rate of change of the total magnetic flux of passing this ring, is uniformly if pass the magnetic flux density of anchor ring, and the transformation period of known magnetic flux density, and we just can calculate the output voltage of ring so.
In the formula: B---magnetic flux density;
The area of S---ring.
The output voltage of ring can also calculate with following formula:
u＝2πfμ
0SnH＝2πfSnB
In the formula: n---the number of turn of ring;
μ
0---permeability of vacuum;
H---magnetic field intensity;
F---measured signal frequency.
If pass the magnetic flux density of S face is uniformly, then
Another part is produced by electric field component.When high frequency, the outer conductor of shielding line is equivalent to a dipole antenna, and the electric field of incident wave produces electric current on outer conductor, forms voltage at breach 11 places, and this voltage is coupled on the inner wire by distributed capacitance, forms field coupled; Be coupled to receiver inlet by one section transmission line.If the very symmetry that open on breach 11 both sides on the outer conductor of annular open circle 10, the electric field that then is coupled on the inner wire can be cancelled out each other, and the annular probe that therefore has the electric shield effect receives only magnetic component, so the repeatability of measuring can improve greatly.And, because the terminal voltage of ring is directly proportional with magnetic flux density component perpendicular to the plane of a loop incident wave, so electric little ring can be used as the measurement magnetic flux density.
The emf probe of present embodiment is a receiving transducer that frequency range is very wide, and when popping one's head near radiation source, the signal of radiation source is coupled on the probe by distributed capacitance, thereby reaches the purpose of radiation signal being carried out near-field detection.Its look-in frequency scope depends on low noise amplifier or the EMI test receiver that is attached thereto, the typical electrical Field probe coefficient T F (1/dB) of wound form probe as shown in Figure 7, the typical case of Metal Ball formula electric field probe pops one's head in coefficient T F (1/dB) as shown in Figure 8, the typical case of the annular open circle magnet field probe of diameter 1cm pops one's head in coefficient T F (1/dB) as shown in Figure 9, and the typical case of the annular open circle magnet field probe of diameter 6cm pops one's head in coefficient T F (1/dB) as shown in figure 10.
In conjunction with the accompanying drawings 1, accompanying drawing 4 as can be known, low noise amplifier C comprises integrated amplifier SL560C, by the amplitude limiter circuit that diode D1～D6 forms, power supply power supply and indicating circuit that IC2 and peripheral electron element are formed.Low-noise wide-band amplifier shown in Figure 4 is the special-purpose amplifier with very low noise figure and very wide frequency range, when signal is more weak, the output of emf probe is amplified through low noise amplifier earlier, delivers to the EMI test receiver again.The low-noise wide-band amplifier employing PLESSEY company product SL560C low noise amplifier adaptive with emf probe is that core is made, SL560C is the bipolar monolithic high frequency low noise of a silicon integrated amplifier circuit, and this circuit adopts four lead-in wire metal garden shape encapsulation (T04); Having characteristics such as bandwidth, gain is high, noise is low, is a kind of universal high frequency linearity amplifier, can do preposition high frequency low noise amplification, radio frequency amplification etc.Capacitor C 3 is used to couple a signal to output BNC head; because the input circuit module sensitivity of EMI receiver is high and very expensive; input circuit module for protection EMI receiver is provided with diode D1～D6 and plays the amplitude limit effect, guarantees that output signal is in the input allowed band of receiver.The working power of amplifier is provided by integrated voltage stabilizer IC2, capacitor C 4～C5, and LED and resistance R 8 are used to indicate working power.Its specific performance index is as follows:
Frequency range: 0.01MHz～1.2GHz; Gain: 〉=15dB; Gain flatness: ± 1.5dB; Noise figure :≤1.8dB; I/O impedance: 50 Ω.
Figure 11 is that the present invention is used for vehicle interior radiation emission test layout synoptic diagram, and Figure 12 is that the present invention is used for the desk-top test arrangement synoptic diagram of Radiation Emission.Probe is located immediately at and is tried equipment EUT or to be measured the position that EUT need test, and is connected with receiver through low noise amplifier.In conjunction with the accompanying drawings 11, accompanying drawing 12, electromagnetic probe is connected with the EMI receiver, and receiver is connected with the PC computing machine by serial line interface.During use, electromagnetic probe is directly connected to the EMI receiver with concentric cable or is connected on the EMI receiver by low noise amplifier; When signal is more weak, the output of probe is amplified through low noise amplifier earlier, deliver to the EMI receiver again.Low noise amplifier can place near the EMI receiver end or near sound end, its operation steps is as follows:
(1) input (IN) end of low noise amplifier is received in the output of will popping one's head in; (2) insert amplifier power supply, closed amplifier power supply switch confirms that the amplifier power supply pilot lamp is bright, treat amplifier power on stable after, output (OUT) end of amplifier is connected to the RF input end of EMI receiver; (3) after test finishes, must disconnect " RF input " incoming line on the EMI receiver front panel earlier, disconnect amplifier power supply again.
The diagnostic test of Electro Magnetic Compatibility, (1) moves on to be measured EUT with electromagnetic probe earlier, observe the radiation signal (at this moment, receiver is the manual measurement mode by software setting) of EUT by upper PC computing machine, determine the zone that strong interferers or interested signal exist.(2) cooperate electromagnetic compatibility test software to measure the amplitude peak of undesired signal automatically with the EMI receiver, measure and write down the frequency and the amplitude of undesired signal.(3) ultimate value that allows according to the Electro Magnetic Compatibility standard redesigns problematic EUT circuit, for example changes or increases measures such as filtering, shielding and ground wire, remeasures the EUT circuit according to preceding step again, and compares with measurement data before transforming.(4) during diagnostic test, use peak detection than fast with quasi-peak value detection and mean value detection measuring speed, the signal that records under the peak detection mode is always more than or equal to the measured value of quasi-peak value and mean value simultaneously.
The present invention is applied to several embodiment of Electro Magnetic Compatibility diagnostic test:
Configuration as shown in figure 13, the present invention are used for the leak-testing of plug connector or shield.In the EMI design, concentric cable or other cable are when shield is outwards drawn, must pass through wave filter, because the field coupled of ground noise and stray capacitance, if wave filter and shield loose contact, then this common mode current also produces radiation outside shield, uses electromagnetic probe of the present invention can check, diagnose its leakage.
Configuration as shown in figure 14, the present invention are used to seek the leakage in shield and electric pad centre joint crack.Exist the EUT of electromagnetic compatibility problem to be subjected to examination equipment for one, use electromagnetic probe of the present invention to move and to find out the position of leaking maximum along the shield slit, and can be according to electromagnetic frequency spectrum, take corresponding electromagnetic compatibility procedure, as: (1) eradicates interference source, and (2) cut off the route of transmission of disturbing.And can be according to the size in EUT shield slit, can select for use different electromagnetic probes to carry out diagnostic test respectively, wound form electric field probe or diameter 1cm annular open circle magnet field probe are used for the less EUT shield test in slit, and Metal Ball formula electric field probe or diameter 6cm annular open circle magnet field probe are used for the bigger EUT shield test in slit.Usually on printed circuit board (pcb), it is radiation source main on the pcb board that signal flows in annular track, and radiation this moment mainly is near the electromagnetic field the ring.Use electromagnetic probe of the present invention can seek the electromagnetic interference source of circuit board, during test, can test by the configuration of the layout of the vehicle interior radiation emission test shown in the accompanying drawing 11 synoptic diagram or the configuration of the desk-top test arrangement synoptic diagram of Radiation Emission shown in the accompanying drawing 12, find radiation root place, redesign problematic circuit, for example change or increase measures such as filtering, shielding and ground wire.
As shown in figure 15, the present invention is used to seek the working condition of the electromagnetic interference source of circuit board.The wiring major part of printed circuit board is a Magnetic Field Source, can use with the supporting emf probe of pick-up unit and seek the big components and parts of radiation.For the equipment that the tried EUT that has electromagnetic compatibility problem, the electromagnetic interference source of circuit board is sought in employing configuration as shown in figure 15, at first determine the Position Approximate of interference source with diameter 6cm annular open circle magnet field probe, there is a certain element that disturbs in the scope of further dwindling interference source with diameter 1cm annular open circle magnet field probe up to finally finding again.
Figure 16 is the working condition that the present invention is used as the test of local sensitivity degree.When testing as the local sensitivity degree, constant amplitude or amplitude-modulated signal source feed-in probe, incentive probe makes it produce an electromagnetic field, and the probe that generates an electromagnetic field is placed the position that needs to measure susceptibility, and the parameter of observation measured piece changes to determine sensitive part and sensitivity.
It is worthy of note: according to design of the present invention, can also make the improvement and the conversion of some similar schemes, conversion as the syndeton scheme of body and conductor, and the present invention also can be connected the technical scheme of carrying out diagnostic analysis by the EMI test receiver with computing machine, surely belongs to the spirit and scope of the invention.
Claims (5)
1. the electromagnetic probe of an electromagnetic compatible diagnostic test in vehicle is characterized in that this detector comprises detection body, adapter, low noise amplifier, and described detection body (A) is provided with electric field probe and magnet field probe, and they include body, conductor; The body of described electric field probe (1) is gone up the body (7) that twines described conductor (2) or described electric field probe and is gone up directly fixing described conductor (6); The conductor of described magnet field probe (10) is one 50 Ω semi-rigid coaxial cable, and this concentric cable is postponed into described body (12) after curving annular open circle (10) from the middle section; Described adapter (B) comprises impedance matching network (3), concentric cable (4) and BNC connector (5); Described low noise amplifier (C) comprises integrated amplifier SL560C, by the amplitude limiter circuit that diode D1～D6 forms, and power supply power supply and indicating circuit that integrated voltage stabilizer IC2 and peripheral electron element are formed; Electric field probe and magnet field probe are electrically connected through the low noise amplifier (C) of adapter (B) with 50 Ω I/O impedances respectively.
2. the electromagnetic probe of a kind of electromagnetic compatible diagnostic test in vehicle according to claim 1, the body (1) that it is characterized in that described electric field probe is an insulation rod (1), described conductor (2) is one 50 Ω concentric cable, and conductor (2) is to be bifilar helix, and the two-wire of inverse clock, varying pitch is wrapped on the described insulation rod (1).
3. the electromagnetic probe of a kind of electromagnetic compatible diagnostic test in vehicle according to claim 1, the body (7) that it is characterized in that described electric field probe is the center conductor (7) of one 50 Ω concentric cable, and the described conductor (6) that directly is fixed on this center conductor (7) is that a diameter is the Metal Ball (6) of 3.2cm.
4. the electromagnetic probe of a kind of electromagnetic compatible diagnostic test in vehicle according to claim 1 is characterized in that the optimum diameter of the annular open circle (10) of described magnet field probe is 1～6cm.
5. the electromagnetic probe of a kind of electromagnetic compatible diagnostic test in vehicle according to claim 4 is characterized in that diameter is the mid-FERRITE CORE of annular open circle (10) of 1cm.
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