Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of: power supplies operating principles and applications, including: block diagram identifying each sub-system constant voltage and current expected waveforms in a power supply power supply function d.c. rectification circuits, including: dual rail supply half wave and full wave rectifiers junction diode characteristics transformer turns ratio and losses filter circuits, including: capacitive and inductive filters ripple zener diode regulator, including: load and line regulation definitions operating parameters and data sheets zener shunt regulator circuit three terminal regulator circuits, including: line and load regulation need for regulation regulated power efficiency remote voltage sensing short circuit protection three terminal regulator characteristics and faults electronic testing and measuring devices and techniques, including: test/measuring devices and their application, including: multimeters signal generators and oscilloscopes voltage and digital testers connection of test/measuring devices into a circuit, including: circuit arrangement of test/measuring devices safety procedures taking readings storage, maintenance and care of test/measuring devices d.c. power supply testing and fault-finding including: rectifier diode faults zener diode faults three terminal regulator faults capacitor faults safe working practices and relevant standards, codes and regulations. |