Section 2.docx

# Protecting against esd 000 029 in this lesson were

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area and increase the humidity in the room to keep the static down. Protecting Against ESD 0:00-0:29 In this lesson, we're going to talk about how to prevent electrostatic discharge or ESD while working on a PC system. Remember, an ESD occurs when there's a difference in electrical potential built up between two objects due to a static charge. When you're working on a PC system, this could be a bad thing because a discharge can damage PC components. So you need to make sure that the static discharges between you and the case are equalized. Use a Static Mat 0:30-1:06 To do this, use a static mat. This is a static mat. A static mat equalizes a static charge. A static mat is composed of a conductive surface. This surface you see right here is designed to conduct electricity. If we take an electrical component, such as a piece of memory or a CPU, and set it on this mat, it establishes connectivity between that device and the mat. That way there's no charge being built up.Any charge that does get built up dissipates between the computer part and the mat and whatever the mat is connected to. Ground the Computer 1:07-1:30 When you're working on a PC system, you need to establish connectivity between the case and the mat and you. What we do first of all is to take the case and use this alligator clip right here to connect or ground a case to the mat. Now we've got connectivity established between the mat and the caseso no difference in static charge can be built up between the mat and the case itself. Ground Yourself 1:31-2:02 The next thing you need to do is to ground yourself so you don't build up a static charge, either. To ground yourself, use a wristband that has a little metal plate and we connect that to our wrist. This establishes connectivity between me and the case and between the case and the mat. Now when we set things up this way, there can be no static charge built up between me, the case or the mat. We're all equalized because the current, anything that does build up, immediately gets dissipated through the system and we stay in equilibrium. Unplug the System 2:03-3:43 Now this brings up a very important point. You need to make sure that this case is unplugged before you start attaching these clips. I'm going to say that again. Before you start attaching the clips, unplug the case because we've got connectivity going on here. You don't want to be connected to 110 volts. Now some people in the industry will try and tell you that it's actually a really good idea to leave the system plugged in while you work on it. They say that because it creates a perfect ground. Now it may be a perfect ground and I don't know about you, but I don't like the idea of being connected electrically to something that's plugged into the wall. If that power supply were to have a fault or a problem and allowed currents to go through the components to which you are grounded, you could get a really nasty shock and if you can't get this wrist strap off fast enough, you're going to have some problems.

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• Spring '14
• Electrostatics, power supply, static electricity, Electrostatic discharge

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