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Ergonomics, Tools and Preventative Maintenance

Ergonomics, Tools and Preventative Maintenance. By Jesse Role Ph. D TM. Integrated Computer Environment. Selecting Implementation Strategies.

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Ergonomics, Tools and Preventative Maintenance

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  1. Ergonomics, Tools and Preventative Maintenance By Jesse Role Ph. D TM

  2. Integrated Computer Environment

  3. Selecting Implementation Strategies • When performing the top-level or architectural design of a system, engineers will partition the required functions between system resources. Some functions may be performed using a human operator; others may use mechanical arrangements while others will use electrical or electronic circuits. In many cases a computer system will provide some of the functionality and under these circumstances it is normal to partition the requirements between the hardware and the software. However, in many cases the use of data offers a third distinct implementation and functions may be partitioned . • Partitioning of System Functions • Required Functions • Data • Software • Hardware

  4. What Is Electrostatic Discharge • Electrostatic Discharge (ESD) is the term given to the discharge of static electricity. We have all experienced what is known as an 'ESD event', an unplanned discharge of static electricity, in our everyday lives. For example, if we have had a shock from a metal doorknob after walking across a carpet on a dry day, or climbing out of a car from the metal body of the vehicle. When our clothes cling to each other after removing them from the dryer, it is caused by an electrostatic charge. In its most dramatic form, the lightning in a thunderstorm is a huge electrostatic discharge.

  5. continuation • Static Electricity is defined as an electrical charge caused by an imbalance of electrons on the surface of a material. This imbalance causes an electric field that can be measured and that can influence other objects at a distance. • Electrostatic Discharge (ESD) is defined as the transfer of electrostatic charge between bodies at different electrostatic potentials caused either by direct contact or by an induced electrostatic field.

  6. What is EMI? • Electrical machine interference • Motors • Welding machines • Ballast or transformer vibration • Loss-connected wires • Etc.

  7. Definitions • Voltage – the force which moves an electrical current against resistance • Waveform – the shape of the signal (previous slide is a sine wave) derived from its amplitude and frequency over a fixed time (other waveform is the square wave) • Amplitude – the maximum value of a signal, measured from its average state • Frequency (pitch) – the number of cycles produced in a second – Hertz (Hz). Relate this to the speed of a processor eg 1.4GigaHertz or 1.4 billion cycles per second

  8. Measuring Signals Amplitude Frequency

  9. Amplitude Modulation vs Frequency Modulation AM- same frequency, different amplitudes FM- Different frequencies

  10. Digital Signals (2)

  11. Digital signals • Represented by Square Wave • All data represented by binary values • Single Binary Digit – Bit • Transmission of contiguous group of bits is a bit stream • Not all decimal values can be represented by binary

  12. Analogue Signals • Human Voice – best example • Ear recognises sounds 20KHz or less • AM Radio – 535KHz to 1605KHz • FM Radio – 88MHz to 108MHz

  13. What is RFI?

  14. Technician's tools • Oscilloscope - frequency, voltage, current and wave pattern • Multi-testers – components and voltage testing • Logic probe testing gates • Anti-static wrist pad • Plastic screw drivers • Assorted peripheral cards • Assorted line cables and adaptor connectors • Soldering iron (20-25 watts) • Cutter pliers • Long nose pliers • Cutter blades • Jumper wires • Set screw drivers flat and Philips • Cleaner fluid • Sand paper • IC clamp or remover

  15. Computer Comfort and Ergonomics • Low voltage consumption • Low radiation and emission • Brightness is within the requirement • Positioning (keyboard and monitor) • Regulated cooling system • Regulated power supply • Plug and play capability

  16. Preventive Maintenance • Use of correct voltage supply (UPS) • Location of computer system • Computer room environment • Regular maintenance and repair • Regular computer upgrade (hardware and software) • Daily computer files repair and cleaning

  17. Operating System – Basic Services • Programs that accept commands and requests from a user and a user’s program • Manages, loads, and executes programs • Manages hardware resources of the computer • Act as an interface between the user and the system

  18. Operating System – Additional Services • Provides interfaces for the user and the user’s programs • File support services • I/O support services • Means of starting the computer • Bootstrapping or booting the computer • Initial Program Load (IPL) • Handles all interrupt processing • Network services • Provides tools and services for concurrent processing

  19. The prolonged malfunction of a computer Can cause the loss of hardware, software, data, or information What is a system failure? aging hardware natural disasters such as fires, floods, or storms random events such as electrical power problems Risks and Safeguards

  20. Using a Multi-meter or Digital Meter • Correctness and accuracy of measurements • Settings range of the testers • Comparative analysis of test results

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