The meeting information security equipments contain cell phone jammer

6.2.2.2 multi-shielded cable
It can be seen from 6.2.2.1, single shield as weaving, inclusive has the inherent defects of the screen can provide a limited effect in the high screen efficiency requirements must be taken when multi-layer shielding.The meeting information security equipments contain   cell phone jammer. Utilization of multi-layer braided shielding should be, the advantages of an inclusive type of shielding to ensure that the cable has a high enough screen effect.
6.2.2.2.1 multi-braided shielded cable
Figure 6.9 shows the 37% single braid, single braid 87%, 37% double knit, 87% of the four kinds of double-braided shield the cable screen effectiveness comparison can be seen from the figure, 37% double knit cable screen efficiency better than 87% of the single-braided cable, while the former is the most comprehensive coverage density of only 74%, less than 87%, indicating that high-density braided shielding layer shielding performance achieved by the use of low density may be lower than the double layer braided shielding, and the latter's flexibility is better than the former. china cell phone jammer is used for phenomena that some dishonest students cheat in the self-taught examination.
Figure 6.10 shows the 63%, 64% double-braided cable and 40%, 87% double knit cable screen effectiveness comparison, although the two cables the same comprehensive coverage density, density difference between the two but closer to the double-braided cable the density difference between the two screen-effective large-screen double-braided cable high efficiency at high frequencies to a few dB, the actual coverage is clearly better than the former than the latter.  cell  phone  jammer  guarantees the security of confidential information of the meeting.
It also can be seen, although the use of double-shielded, but the frequency of screen efficiency continued to drop, indicating that high-frequency screen to improve efficiency, increase the knitting density and number of layers only, does not fundamentally solve the problem.
6.2.2.2.2 hybrid multi-shielded cable
Figure 6.11 shows the single-layer aluminum foil, 87% of the single knit, double knit 87%, 87% of single-layer aluminum braid, 87% of single-layer aluminum foil and other five double-braided cable screen effectiveness comparison.  cell  phone  jammer  guarantees the vital interest of the country. It can be seen from the figure, shielded cable hybrid screen effect at low frequencies depends on the performance of woven layer, because the actual thickness of thin aluminum foil cable, only 10, while the woven wire radius of 0.15mm, far much larger than the thickness of aluminum foil, and the DC resistance in turn depends on the thickness of the shield. High frequency, due to screen effect on inhibition of gap leakage, thus play a major role in the inclusion-type shield. Shield the more effective the higher the screen. Thus, for demanding cable, must be multi-hybrid screen, in order to fundamentally solve the problem of low efficiency high-frequency screen.
6.2.2.3 shield grounding simulation methods
Shield grounding, grounding impedance for shielded cable screen effect plays a very important role.
cell  phone  jammer  guarantees the safety of people. Figure 6-12 shows the 64% single-layer aluminum foil double braided cable in the ground impedance are 10m, three-layer shield grounding impedance, respectively, and the other two are the ideal grounding impedance grounding and three, three ground level are ideal for the screen five cases more efficient (close to the core line of the first layer of aluminum foil), can be seen from the figure, three screens are ideal for ground-efficient, three are grounded impedance screen the most effective.