3. Methodology
In this experiment a developed avalanche transistor circuit was calibrated. A Tektronix TDS 3054B digital oscilloscope with a bandwidth of 500 MHz and sampling rate of 5 GS/s was used to display and to measure the electronic signal. A high-voltage probe (Tektronix P6015A) with the maximum voltage of 20 kV DC or 40 kV for pulse was utilized to measure the high voltage supplied across the circuit. The flow chart of the measurement is shown as in Figure (2). The variable high voltage DC power supply in the range of 0 to 4.5 kV was connected directly to the developed circuit. For safety reason as well as to eliminate noise and to avoid electric shock the experimental setup was arranged properly. When the high speed switching occurs in kilovolt regime, electromagnetic induction (EMI) is expected to occur. This effect was avoided by designing the circuit on one layer of printed circuit board (PCB) and all the components were soldered and sealed properly. All the components and circuit are kept in isolated plastic case such illustrated as in Figure (3). The parameters such as the voltage switching, falling time and pulse duration were measured using the high voltage probe and oscilloscope.