Does it matter if it's on your left or right wrist? I keep reading that you just attach the other end to metal in your computer case, does it matter if this metal is touching the power supply? Does it matter if the computer is plugged into the wall or not?
What is the proper way to use a wrist strap?
- Thread starter btcomm1
- Start date
Ricemarine
Lifer
- Sep 10, 2004
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1. No it doesn't matter on left or right.
2. It would be NOT RECOMMENDED to put it directly on the power supply. But if the power supply is screwed into the case, and you hooked your wrist strap to a side of the case, its fine.
3. You would be risking your life + your computer by leaving your computer plugged into the wall...
2. It would be NOT RECOMMENDED to put it directly on the power supply. But if the power supply is screwed into the case, and you hooked your wrist strap to a side of the case, its fine.
3. You would be risking your life + your computer by leaving your computer plugged into the wall...
pcgeek11
Lifer
- Jun 12, 2005
- 22,350
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Hardly. Actually there are No dangerous voltages coming out of the power supply as long as you do not open the power supply housing. Plus the ground wire from the wall outlet prevents any static buildup on the case. Of course plugging and unplugging devices even with the " wake-up " 5VDC could damage your pc.
I always leave the power supply plugged into the wall, and turn off the power switch on the back of the power supply. That way the Hot AC lead is open and the 5VDC is off, plus I have a really well grounded case and me.
With the PC unplugged you should have it on a anti static station with a proper mat and ground.
pcgeek11
Originally posted by: Iron Addict
straps are for pussies..
Not if you are a system builder. It's just common sense to use one especially in dry conditions.
AUsm
pcgeek, what would you do if the power supply didn't have a switch on it? You are saying that if you are connected to the case with the wrist strap but the power supply isn't plugged in you could still shock the components? Is that very likely or do you just do that to be safe?
http://www.designnotes.com/Merchant2/me...OD&Product_Code=AS8&Category_Code=tots
What would you connect this clip to on this static matt so that it's grounded? Or would you recomend one that plugs into an AC outlet?
Also what would you use to put ram into a laptop? Seems like most laptops are plastic so if you put it upside down on a static mat would that be sufficient?
http://www.designnotes.com/Merchant2/me...OD&Product_Code=AS8&Category_Code=tots
What would you connect this clip to on this static matt so that it's grounded? Or would you recomend one that plugs into an AC outlet?
Also what would you use to put ram into a laptop? Seems like most laptops are plastic so if you put it upside down on a static mat would that be sufficient?
- Nov 30, 2005
- 50,231
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Listen to this man, he knows what he is talking about.
Oh and so does this guy
Originally posted by: Iron Addict
straps are for pussies..
Would Tripp Lite's instant-read CT120 circuit tester verify that the outlet had a good ground? Here is a link to it.
http://it.pcconnection.com/web/Shopping...DA2054615414BFC501C26125B9A3CF1BD2E20E
http://it.pcconnection.com/web/Shopping...DA2054615414BFC501C26125B9A3CF1BD2E20E
Ground is just a point of reference. There is nothing holy about Ground! Do you think someone who is working on an electronic equipment aboard a flying airplane (or on the space-station) has no way of protecting it against ESD because he is not connected to Ground?
All you need is to be at the same potential as the ground plane of the equipment you are working on. In this case, it is the case, which is connected to the ground plane of the motherboard through the power supply 20/24-pin cable.
As long as you are connecting yourself to the motherboard ground plane, having the PSU plugged into the AC outlet or not makes no difference.
All you need is to be at the same potential as the ground plane of the equipment you are working on. In this case, it is the case, which is connected to the ground plane of the motherboard through the power supply 20/24-pin cable.
As long as you are connecting yourself to the motherboard ground plane, having the PSU plugged into the AC outlet or not makes no difference.
Are you saying that when you are connected to ground you do not have a 0 volts static electricity? What if you are connected to the case with a wrist strap and the case has 4000 volts and you take ram out of a new package, what does ram have out of the package by default? Is it possible your case could clime up to 10,000 volts while you are connected to it?
No, I never said that
The RAM will be at the potential it was when it was placed inside the antistatic bag. If everybody followed the ESD standard, everybody would be at 0 potential when they put RAM in the bag. But, I would not hold my breath specially if I buy a used item from someone. So, even if you are grounded (0 potential with respect to Earth), there is no guarantee that the item inside the bag is also at 0 potential.
First hold the bag while the bag is still closed. Your body and the outside of the bag are now at the same potential. Now, open the bag but do not remove the item. Just touch the inside of the bag. Now, the inside of the bag is at the same potential as your body. Antistatic bag has high resistance. So, the voltage change occurs at a low rate (low current). The item is at the same potential as the inside of the bag. So, the item moves to the same potential as your body safely as long as you let the antistatic bag does the charge transfer. Never take the item out without first touching the inside of the bag.
Yes. It is possible if the case is not grounded.
The point is that potential is relative. As long as you and the item you are working on are at the same potential, you cannot damage it.
I ask again, how would you ground yourself if you were working on the space-station?
You are saying that ground is 0 potential. What is ground set at? Is it 0 volts? Is it 400 volts? Is it 600 volts?
Also, I assume that if the item is at a higher voltage then you are that a discharge from it to you is not harmful just the other way around is that correct?
Also, I assume that if the item is at a higher voltage then you are that a discharge from it to you is not harmful just the other way around is that correct?
I have no problem with grounding. It is the best practice to ground yourself when working on electronics.
The best practice is also to control humidity. It is also to use ionizers to ionize the air. It is to have what you are working on on a grounded ESD mat. It is to also wear antistatic uniform. .......
However, grounding should not give you a false sense of protection. You can still damage sensitive components if you don't know what you are doing. A component inside an antistatic bag could be at a potential other than 0!
The best practice is also to control humidity. It is also to use ionizers to ionize the air. It is to have what you are working on on a grounded ESD mat. It is to also wear antistatic uniform. .......
However, grounding should not give you a false sense of protection. You can still damage sensitive components if you don't know what you are doing. A component inside an antistatic bag could be at a potential other than 0!
I understand about potential, if both you and the ram are at 10,000 volts then the potential is 0. Do you know what volts ground is though? Also what I'm more interested in is, lets say you are at 10,000 and the ram is at 15,000, you touch the ram discharge goes to you, could that still harm the ram or is it only really the other way around when you discharge volts to the ram?
Also, I assume the way you use an anti static mat is you place the pc on it, open up the pc then connect the cord from the mat to your case that way the mat and the pc and components are all at the same potential.
Also, I assume the way you use an anti static mat is you place the pc on it, open up the pc then connect the cord from the mat to your case that way the mat and the pc and components are all at the same potential.
Ground is relative.
It's like me saying K2(mountain) is 8611 Meters tall with respect to see level, but only 4017 m tall with respect to where the mountain starts. It depends what you decide to be the point of reference.
I see, so the ground voltage is different depending on where you go? So then how can a manufcature make sure the component is at ground at their factory when they place it in the anti static bag if volts could be differn't everywhere they ship it?
As was said before, ground is a reference, and just because 2 grounds are connected by a wire doesnt guarantee they are the same.
In my embedded systems design class, we have seen people connect 2 boards using 1 banana cable, and then measure the voltage difference between the ground plane. Ive seen as high as 3V difference between two "Shorted" ground planes. 3V = Screws up TTL or pretty much logic pretty darn badly. Grounds are tricky.
In my embedded systems design class, we have seen people connect 2 boards using 1 banana cable, and then measure the voltage difference between the ground plane. Ive seen as high as 3V difference between two "Shorted" ground planes. 3V = Screws up TTL or pretty much logic pretty darn badly. Grounds are tricky.
Are you laughing because people have differnt opinions or do you feel that we are all wrong or what?
Do you have an answer to any or all of these questions?
Do you have an answer to any or all of these questions?
I'm not sure how many times you are going to ask this question. Your question is wrong! Voltage is relative. You cannot ask what the voltage of something is. The same as you cannot ask what the altitude of something is unless you specify a point of reference.
Makes no difference! It is the current that damages the component. The direction of the current (dictated by the polarity of voltage) has no effect. -1000V is as harmful as +1000V.
No, the mat is connected to ground through special wiring (controlled resitance). The equipment on the mat will not be connected to anything. The operator will also be connected to ground through controlled resistance (wrist strap).
For someone working on a personal computer at home, the best practice is to always touch the (metallic part of the) case before and while working on it. Always touch the antistatic bag outside then inside then the component.
JEDIYoda
Lifer
- Jul 13, 2005
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Actually its a question that really doesn`t need to be asked other than to waste peoples time. A wrist strap is a wrist strap.....do a google search....rofl....hahahaaa
Here is what I came up with after i stopped laughing....after all when was the last time you lost a component due to static electricity buiuldup discharging????
Sure its possible....but...
Originally Posted by Direct quote from Scott Mueller's Upgrading and repairing PC'sWhen you are working on the internal components of a computer, you must take the necessary precautions to prevent accidental static discharges to the components. At any time, your body can hold a large static voltage charge that can easily damage components of your system. Before I ever put my hands into an open system, I first touch a grounded portion of the chassis, such as the power supply case. This action serves to equalise the electrical charges the device and my body might be carrying. Be sure the power supply is unplugged during all phases of the assembly process. Some will claim that you should leave the system plugged in to provide an earth ground through the power cord and outlet, but that is unecessary. If you leave the system plugged in, you open yourself to other problems, such as accidentally turning it on or leaving it on when installing a board or device, which can damage the motherboard or other devices.
A more sophisticated way to equalise the charges between you and any of the system components is to use an ESD protection kit. These kits consist of a wrist strap and mat, with ground wires for attachment to the system chassis. When you are going to work on a system, you place the mat next to or partially below the system unit. Next, you clip the ground wire to both the mat and the systems chassis, tying the grounds together. You then put on the wrist strap and attach that wire to a ground. Because the mat and system chassis are already wired together, you can attach the wrist-strap wire to the system chassis or to the mat. If you are using a wrist strap without a mat, clip the wrist-strap wire to the system chassis. When clipping these wires to the chassis, be sure to use an area that is free of paint so a good ground contact can be achieved. This setup ensures that any electical charges are carried equally by you and any of the components in the system, preventing the sudden flow of static electricity that can damage the circuits.
As you install or remove disk drives, adapter cards, and especially delicate items such as the entire motherboard, SIMMs, or processors, you should place these components on the static mat. Sometimes people put the system unit on top of the mat, but the unit should be alongside the mat so you have room to lay out all your components as you work with them. If you are going to remove the motherboard from a system, be sure you leave enough room for it on the mat.
If you do not have such a mat, place the removed circuits and devices on a clean desk or table.
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