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 fault find and repairing sonar apparatus and systems. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EH140A Sonar apparatus and system fault finding and repair Evidence shall show an understanding of sonar apparatus and systems fault finding and repair, applying safe working practices and relevant Standards Codes and Regulations to an extent indicated by the following aspects: T1. Electronic communications, sonar system operating principles The purpose and application of sonar systems Sonar equipment encompassing: Types and their applications Sub-system components (i.e. functional blocks) and their function encompassing: Transducer Input amplifier Sonar interface unit Beam forming network (transmit / receive) Signal processing Own Doppler nullification Display system Headset Interfaces Transmitter T/R Switch Timer/Timing Sonar operating parameters Sonar transmission characteristics T2. Electronic communications, sonar transducers and arrays Hazards and risk control measures Transducer types, their operating principles and parameters Transducer array encompassing: Types and their construction Applications Transducer hull outfits Beam forming principles and requirements Transducer installation and operational maintenance T3. Electronic communications, sonar measurement and set up Sonar parameters and measurements Sonar physical parameters Constraints and Consequences T4. Electronic communications, radar and sonar displays devices Types and their applications - CRT, Plasma, LCD, Monochrome, Colour, and Touch screen. Sub-system components (i.e. functional blocks) and their operating parameters encompassing: EHT transformers detectors video distribution time base generators phase locked loops microprocessors memory devices demodulators focusing/deflection devices delay lines bleed resistors HV generation Calibration testing and maintenance procedures Typical fault finding, their symptoms and cause T5. Advanced electronic (sonar) testing and measuring devices and techniques Test/measuring devices and their application - frequency counters, and synthesisers, spectrum analysers, noise and distortion meters and RF communications service monitor. Connection of test/measuring devices into a circuit encompassing: safety procedures loading and matching storage and delay circuit arrangement of test/measuring devices Taking and interpreting readings Notion of decibels including dBm, dBr, dBu, dBo T6. Fault finding and repair Typical faults, their symptoms and cause Fault diagnosis procedures and testing Component replacement Equipment adjustments |