Презентация Computer systems онлайн
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Презентации » Технология » Computer systems
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- Тип файла:ppt / pptx (powerpoint)
- Всего слайдов:65 слайдов
- Для класса:1,2,3,4,5,6,7,8,9,10,11
- Размер файла:8.66 MB
- Просмотров:90
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- Автор:неизвестен
Слайды и текст к этой презентации:
№6 слайд
![Tribo-electrification Static](/documents_6/c43ab780648881748502449ca92d4583/img5.jpg)
Содержание слайда: Tribo-electrification
Static electricity must build up a charge greater than 1000 V before we may notice it
Static Electricity is harmless to humans
We can withstand up to and including 10,000 V
Most CPUs, motherboards and associated circuitry normally operates at +/- 5 V
An electrical discharge of 10,000 V will blow almost all computer components
№9 слайд
![ESD protective devices A](/documents_6/c43ab780648881748502449ca92d4583/img8.jpg)
Содержание слайда: ESD protective devices
A range of ESD protective devices are available to protect the computer from you including
Wrist Strap
Elasticised wristband with a metal pad which fits next to the skin
The cable runs to a ground connector which connects to a earth
Anti-Static Mat
Large rubber mat, runs to a ground connector which connects to earth
Usually you can connect your wrist band onto the mat
Anti-Static Bag
Used to transport and protect computer components
Newly purchased components are usually supplied in these bags
Any components not in the chassis of the computer must be kept in one of these bags
№10 слайд
![Working inside a computer](/documents_6/c43ab780648881748502449ca92d4583/img9.jpg)
Содержание слайда: Working inside a computer
When working on the internals of a computer you must…
Always connect yourself to an electrostatic wristband and ensure you are earthed
You should also do this when handling components outside of the computer and that are not even connected
Keep any ‘spare’ components that are not being used in electrostatic bags
Never wear a grounding strap when operating a monitor
The capacitors hold a huge charge, wearing the strap offers a shortcut – straight through you to the ground!
№14 слайд
![Follow the safety rules Be](/documents_6/c43ab780648881748502449ca92d4583/img13.jpg)
Содержание слайда: Follow the safety rules
Be prepared: have the right tools at hand
Obey the dress code: nothing dangling that will trap you
Wear your ESD wrist band
Before starting, turn off the PC and disconnect the AC power chord
Read the manual: do not do things from memory
Ground yourself by touching the chassis to discharge any static electricity that has accumulated in your body
Handle all parts gently, hold components by their edges
Remember that some components might be too hot to touch safely
Take your time and think carefully before acting
№17 слайд
![How do you know if its](/documents_6/c43ab780648881748502449ca92d4583/img16.jpg)
Содержание слайда: How do you know if its working?
Anti-static wrist straps can fail to perform their intended function.
Ground cords get stressed from prolonged use and can break open inside the insulation.
You can't see if your anti-static wrist strap is performing properly
They should be tested regularly.
Electronics professionals should test their wrist straps for proper function at least once per day
№18 слайд
![Testing your wrist band](/documents_6/c43ab780648881748502449ca92d4583/img17.jpg)
Содержание слайда: Testing your wrist band
Firstly check your multi-meter is working correctly by setting the 2M-ohms. Have both probes make contact with each other and record the reading.
Now remove the wristband from your antistatic band and holding one probe at each end test it
Does it give expected results, if not, why not?
Why is it important to carryout periodic testing of anti-static protection devices?
Don't worry it's only ESD
What not to do
№53 слайд
![Specialised Cards Graphics](/documents_6/c43ab780648881748502449ca92d4583/img52.jpg)
Содержание слайда: Specialised Cards – Graphics Card
What is it?
A video card is a hardware component whose function is to generate and output images to a display
A graphics Card includes multiple sub-components
Graphics Processing unit (GPU)
Video BIOS
Video Memory
RAMDAC
Outputs
Motherboard Interface
Cooling Devices
Power Demand
№54 слайд
![Graphics Processing Unit GPU](/documents_6/c43ab780648881748502449ca92d4583/img53.jpg)
Содержание слайда: Graphics Processing Unit (GPU)
A GPU is a dedicated graphics processor optimized for floating point calculations which are fundamental to 3D graphics rendering
The main attributes of the GPU
Are the core clock rate (typically ranging from 250MHz to 850MHz)
The number of pipelines (Vertex or Fragment shaders) used to translate a 3D image into a 2D image formed by pixels
№55 слайд
![Video BIOS This contains the](/documents_6/c43ab780648881748502449ca92d4583/img54.jpg)
Содержание слайда: Video BIOS
This contains the basic program that governs the video card’s operations and provides the instrusions that allow the computer and software to interface with the card
It contains information on the memory timing, operating speeds and voltages of the graphics processor and RAM and other information
It is sometimes possible to change the BIOS for higher performance although is this is typically only done by card over-clockers as it has the potential of damage to the card
№56 слайд
![Video Memory While a Video](/documents_6/c43ab780648881748502449ca92d4583/img55.jpg)
Содержание слайда: Video Memory
While a Video Card will have its own video memory called video RAM
The memory capacity of most modern video cards range from 128MB to 2GB
Since video memory needs to be accessed by the GPU it uses high speed memory
DDR, DDR2, GDDR3, GDDR4 & GDDR5
The memory clock rate in modern cards are generally between 400MHz and 2.4GHz
№57 слайд
![Outputs There are the](/documents_6/c43ab780648881748502449ca92d4583/img56.jpg)
Содержание слайда: Outputs
There are the connection systems which connects the displays with the video card
Some different connection systems are as follows
Analogue-based standard adopted in the late 1980s designed for CRT displays, also called VGA connector
Digital-based standard for displays such as flat-panel displays and video projectors, these digital based DVI connectors are used for HDTV
HDMI is an advanced digital audio/video interconnector released in 2003 and is commonly used to connect Gaming Consoles and DVD players to a display
Display connectors
№60 слайд
![Power Demand Fast Video Cards](/documents_6/c43ab780648881748502449ca92d4583/img59.jpg)
Содержание слайда: Power Demand
Fast Video Cards consume a great deal of power
Power demands of GPU are mainly greater than that of CPUs, meaning that the video card may be the biggest power consumer in the system
Most connection systems that can be used to connect a graphics card supply no more than 75watts to power a graphics card
For recent graphics cards that require more than this level of power can connect to a direct PSU power source
8 pin (150W) power source
№61 слайд
![Advantages of Graphics Cards](/documents_6/c43ab780648881748502449ca92d4583/img60.jpg)
Содержание слайда: Advantages of Graphics Cards
Anti-Aliasing: This is a technique used to counter distortion caused by aliasing effects
Motion Blur: Effect used to blur objects moving in fast motion
Texture Mapping: Allows the addition of detail on surfaces, without adding complexity
Depth of Field: Technique that blurs out of focus objects
Lens Flare: Imitation of light sources
Fresnel Effect: Reflections over an object, depending on the angle of vision, the greater the angle of vision the greater the reflection
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