8) This describes the essential skills and knowledge and their level, required for this unit. Evidence shall show that knowledge has been acquired of safe working practices and troubleshooting frequency dependent circuits. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EH114A Resonance circuits troubleshooting Evidence shall show an understanding of resonance circuit troubleshooting, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects: T1. Basic engineering mathematics SI Units Using a calculator. Basic Algebra Applying the laws of indices. Simplification of expressions involving square roots. Graphs and tables. Pythagoras’ Theorem and trigonometry ratios. T2. Sinusoidal alternating voltage and current Generating a sinusoidal waveform Definition of the terms period, peak, peak-to-peak, instantaneous, average, and root-mean-square value Calculating the instantaneous value of a sinusoidal waveform Calculating the root-mean-square value and frequency of a of a sinusoidal waveform Phase relationship between two or more sinusoidal waveforms Common waveforms used in electronic circuitry Observation of sinusoidal and other waveforms T3. A.C. measuring equipment Operating principles of a cathode ray oscilloscope (CRO) Set up, calibration and use of a CRO Calibration and limitation of CRO probes Analogue and digital a.c. measuring instruments including true root-mean-square reading instruments Measurement of the instantaneous, peak, peak-to-peak values and period of sinusoidal and other common waveforms T4. Phase relationships in a.c. circuits Phasor representation of sinusoidal waveforms Definitions of in-phase, out-phase, phase angle, lead and lag Phasor addition of two voltages or currents T5. Resistive a.c. circuits Ohms law in a.c resistive circuits Current and voltage phase relationship Power dissipation T6. Inductance in a.c. circuits Principles of inductance Units Inductive time constant circuits Inductive reactance Ohms law in inductive a.c. circuits Phase relationships Verification of operation of RC time constant circuit T7. Capacitance in a.c. circuits Capacitive reactance Ohms law in capacitive a.c. circuits Current and voltage phase relationships T8. Series a.c. circuits Definition of Impedance Impedance The impedance triangle Voltages distribution Vector representation of current and voltages Verification of operation of series a.c. circuit T9. Parallel a.c. circuits Current distribution Vector representation of voltage and currents Impedance calculations based on total circuit current and voltage Verification of operation of parallel a.c. circuit T10. Series-parallel a.c. circuits Examples of circuit Rules for simplification T11. Power factor Power triangle True power Apparent power Reactive power Power factor Power factor correction T12. Ideal transformer Construction and operating principles Step-up, step-down, turns ratios, voltage and current ratios Autotransformer Core losses Types of cores and applications Volt-Ampere (VA) rating Verification of operation of transformer circuit T13. Series resonance Conditions in a circuit that produce series resonance Relationship between resonance and frequency Impedance of a series resonant circuit Phasor representation of current and series voltage drops in series resonant circuit Voltage magnification The Q of a coil and its relevance Bandwidth and half power points in a resonant circuit Selectivity Verification of operation of series resonant circuit T14. Parallel resonance Conditions in a circuit that produce parallel resonance Impedance of a parallel resonant circuit Vector representation of voltage and parallel branch currents in a parallel resonant circuit Current magnification Verification of operation of parallel resonant circuit T15. Filters Purpose of a filter Circuits for operation of the following passive filter circuits: high pass, low pass, band stop and band pass Bandwidth, attenuation, cut-off, roll off and order of filter Measurements and calculations relating to passive filters Curves showing the behaviour of various types of filter circuits Verification of operation of each filter type |