Abstract.Leakage current measurement which can follow IEC standard for medical device is one of many challenges to be answered. The IEC 60601-1 has defined that the limit for a leakage current for Medical Device can be as low as 10 µA and as high as 500 µA, depending on which type of contact (applied part) connected to the patient. Most people are using ELCB (Earth-leakage circuit breaker) for safety purpose as this is the most common and available safety device in market. One type of ELCB devices is RCD (Residual Current Device) and this RCD type can measure the leakage current directly. This work will show the possibility on how Helmholtz Coil Configuration can be made to be like the RCD. The possibility is explored by comparing the magnetic field formula from each device, then it proceeds with a simulation using software EJS (Easy Java Simulation). The simulation will make sure the concept of magnetic field current cancellation follows the RCD concept. Finally, the possibility of increasing the measurement's sensitivity is also analyzed. The sensitivity is needed to see the possibility on reaching the minimum leakage current limit defined by IEC, 0.01mA.
Electroluminescence (DC and AC) and photoluminescence of CaS:Cu, Er and CaS:Cu have been investigated. Emission spectra have been explained on the basis of the Williams-Prener model. The brightness-voltage dependence satisfies the relation B=B0 exp(-b/V12/) though in some cases two modes of variation are effective. The temperature dependence of PL brightness does not show any appreciable change while that of EL brightness shows a number of peaks. The EL efficiency passes through a maximum at some intermediate value of voltage. This is explained in terms of a transport process of the Schottky-emission type.
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