Volume 3 nr 1 / 2011 - Academia Oamenilor de Stiinta din Romania

136 Alexandru Ionuț Chiuță, Liviu Mihai Sima, Nicoleta Doriana SecăreanuCapacitive coupling is shown by the disrupted voltage (CCTV system).Upr jCkRipUwhere: Ck= coupling capacityRip= input impedance of disturbed elementIn fig. 2, the disruptive coupling is presented function of the coupling impedanceZC and disturbed route impedance ZNZCZN= coupling impedance= characteristic impedance of the route subject to disturbance4.5. Comments1. - coupling impedance ZC is higher;- CCTV cable characteristic impedance N2. - 1 m of coaxial cable provides [75 pF/m];- 1 cm of grounding route determines [1nH];Z is: 75 4Z .NZ C- mutual inductance between two wires of 100 mm long, spaced at 2 mm,is about 20 nH.Fig. 2. Disruptive coupling functionof the coupling impedance and disturbed route impedance.Copyright © Editura Academiei Oamenilor de Știință din România, 2011Watermark Protected