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How to safely discharge oneself
How can I quickly and safely discharge a charged capacitor (small and low voltage; <= 42V)?What is / how can I get a student-safe power supply for electronics projects?Safely discharging large value capacitor without blowing it upUse a steel welding table to ground yourself from electrostatic discharge (ESD)?How do I safely discharge this capacitor with broken wire?How can I quickly and safely make defunct electronics safe and free of charged capacitors?active bleeder circuit for capacitor dischargeHow long does it take 1mA discharge current to discharge 24V 35Ah battery down to 8V
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At work I have the problem that I seem to collect a lot of static charge as soon as I leave my desk and return.
I am not quite sure why this happens. Strangely enough the effect is stronger the briefer I am away.
Since I work with electronics being charged can damage the things I am working with. So what I am doing at the moment is discharge myself anytime I return at my PC housing. This works, but it always causes flickering in my monitor and sometimes I have to replug my mouse to make it work again.
I know that most electronics have some kind of ESD protection built in, but that these get less and less effective the more they are used and will someday break.
That is why I am worried about my equipment in the long term and would like a safer way to discharge myself.
I tried using the earth contact of the mains power outlet, but it hurts a lot more and the effect on my equipment seems to be even worse. I think it has to do with the fact that the PC housing is painted and therefore has a lot higher resistence.
safety esd discharge
edited May 17 at 16:22
jusaca
2,8932 gold badges11 silver badges35 bronze badges
asked May 17 at 8:23
KarstenKarsten
2252 silver badges9 bronze badges
$endgroup$
|
show 8 more comments
$begingroup$
At work I have the problem that I seem to collect a lot of static charge as soon as I leave my desk and return.
I am not quite sure why this happens. Strangely enough the effect is stronger the briefer I am away.
Since I work with electronics being charged can damage the things I am working with. So what I am doing at the moment is discharge myself anytime I return at my PC housing. This works, but it always causes flickering in my monitor and sometimes I have to replug my mouse to make it work again.
I know that most electronics have some kind of ESD protection built in, but that these get less and less effective the more they are used and will someday break.
That is why I am worried about my equipment in the long term and would like a safer way to discharge myself.
I tried using the earth contact of the mains power outlet, but it hurts a lot more and the effect on my equipment seems to be even worse. I think it has to do with the fact that the PC housing is painted and therefore has a lot higher resistence.
safety esd discharge
edited May 17 at 16:22
jusaca
2,8932 gold badges11 silver badges35 bronze badges
asked May 17 at 8:23
KarstenKarsten
2252 silver badges9 bronze badges
$endgroup$
18
$begingroup$
is there a reason you can't use a standard ESD wrist strap?
$endgroup$
– Puffafish
May 17 at 8:26
4
$begingroup$
When I return to my desk, I ground myself on a conductor. There are an order of magnitude fewer nerve cells in the outside of a knuckle than the pad of a fingertip, so I lightly punch it, rather than use my finger.
$endgroup$
– Neil_UK
May 17 at 12:44
6
$begingroup$
The old school, though not entirely professional way, is to grab a radiator before touching electronics with your hands. (That is, the stuff that heats your building, not stuff that gives out radio waves. Silly English language.)
$endgroup$
– Lundin
May 17 at 13:48
10
$begingroup$
Dude, I had exactly this problem. The static was so significant, on one occasion I touched the backplate of a network card which instantly threw a network error on the computer's screen. The NIC refused to work again until the PC was rebooted. Vending machines would reboot themselves when I touched the coin slot. Turns out it was my shoes on the cheap synthetic carpet tiles at work; every time I walked to the kitchen I was "charging up" owing to friction. Google for "Antistatic Heel Grounder" or "ESD footwear".
$endgroup$
– Rab
May 17 at 15:44
3
$begingroup$
Some chairs have synthetic fabrics that build up a lot of charge when you sit down in / get up from them.
$endgroup$
– W5VO♦
May 17 at 16:16
|
show 8 more comments
$begingroup$
At work I have the problem that I seem to collect a lot of static charge as soon as I leave my desk and return.
I am not quite sure why this happens. Strangely enough the effect is stronger the briefer I am away.
Since I work with electronics being charged can damage the things I am working with. So what I am doing at the moment is discharge myself anytime I return at my PC housing. This works, but it always causes flickering in my monitor and sometimes I have to replug my mouse to make it work again.
I know that most electronics have some kind of ESD protection built in, but that these get less and less effective the more they are used and will someday break.
That is why I am worried about my equipment in the long term and would like a safer way to discharge myself.
I tried using the earth contact of the mains power outlet, but it hurts a lot more and the effect on my equipment seems to be even worse. I think it has to do with the fact that the PC housing is painted and therefore has a lot higher resistence.
safety esd discharge
edited May 17 at 16:22
jusaca
2,8932 gold badges11 silver badges35 bronze badges
asked May 17 at 8:23
KarstenKarsten
2252 silver badges9 bronze badges
$endgroup$
At work I have the problem that I seem to collect a lot of static charge as soon as I leave my desk and return.
I am not quite sure why this happens. Strangely enough the effect is stronger the briefer I am away.
Since I work with electronics being charged can damage the things I am working with. So what I am doing at the moment is discharge myself anytime I return at my PC housing. This works, but it always causes flickering in my monitor and sometimes I have to replug my mouse to make it work again.
I know that most electronics have some kind of ESD protection built in, but that these get less and less effective the more they are used and will someday break.
That is why I am worried about my equipment in the long term and would like a safer way to discharge myself.
I tried using the earth contact of the mains power outlet, but it hurts a lot more and the effect on my equipment seems to be even worse. I think it has to do with the fact that the PC housing is painted and therefore has a lot higher resistence.
safety esd discharge
safety esd discharge
edited May 17 at 16:22
jusaca
2,8932 gold badges11 silver badges35 bronze badges
asked May 17 at 8:23
KarstenKarsten
2252 silver badges9 bronze badges
edited May 17 at 16:22
jusaca
2,8932 gold badges11 silver badges35 bronze badges
asked May 17 at 8:23
KarstenKarsten
2252 silver badges9 bronze badges
edited May 17 at 16:22
jusaca
2,8932 gold badges11 silver badges35 bronze badges
edited May 17 at 16:22
jusaca
2,8932 gold badges11 silver badges35 bronze badges
edited May 17 at 16:22
jusaca
2,8932 gold badges11 silver badges35 bronze badges
2,8932 gold badges11 silver badges35 bronze badges
asked May 17 at 8:23
KarstenKarsten
2252 silver badges9 bronze badges
asked May 17 at 8:23
KarstenKarsten
2252 silver badges9 bronze badges
asked May 17 at 8:23
KarstenKarsten
2252 silver badges9 bronze badges
2252 silver badges9 bronze badges
18
$begingroup$
is there a reason you can't use a standard ESD wrist strap?
$endgroup$
– Puffafish
May 17 at 8:26
4
$begingroup$
When I return to my desk, I ground myself on a conductor. There are an order of magnitude fewer nerve cells in the outside of a knuckle than the pad of a fingertip, so I lightly punch it, rather than use my finger.
$endgroup$
– Neil_UK
May 17 at 12:44
6
$begingroup$
The old school, though not entirely professional way, is to grab a radiator before touching electronics with your hands. (That is, the stuff that heats your building, not stuff that gives out radio waves. Silly English language.)
$endgroup$
– Lundin
May 17 at 13:48
10
$begingroup$
Dude, I had exactly this problem. The static was so significant, on one occasion I touched the backplate of a network card which instantly threw a network error on the computer's screen. The NIC refused to work again until the PC was rebooted. Vending machines would reboot themselves when I touched the coin slot. Turns out it was my shoes on the cheap synthetic carpet tiles at work; every time I walked to the kitchen I was "charging up" owing to friction. Google for "Antistatic Heel Grounder" or "ESD footwear".
$endgroup$
– Rab
May 17 at 15:44
3
$begingroup$
Some chairs have synthetic fabrics that build up a lot of charge when you sit down in / get up from them.
$endgroup$
– W5VO♦
May 17 at 16:16
|
show 8 more comments
18
$begingroup$
is there a reason you can't use a standard ESD wrist strap?
$endgroup$
– Puffafish
May 17 at 8:26
4
$begingroup$
When I return to my desk, I ground myself on a conductor. There are an order of magnitude fewer nerve cells in the outside of a knuckle than the pad of a fingertip, so I lightly punch it, rather than use my finger.
$endgroup$
– Neil_UK
May 17 at 12:44
6
$begingroup$
The old school, though not entirely professional way, is to grab a radiator before touching electronics with your hands. (That is, the stuff that heats your building, not stuff that gives out radio waves. Silly English language.)
$endgroup$
– Lundin
May 17 at 13:48
10
$begingroup$
Dude, I had exactly this problem. The static was so significant, on one occasion I touched the backplate of a network card which instantly threw a network error on the computer's screen. The NIC refused to work again until the PC was rebooted. Vending machines would reboot themselves when I touched the coin slot. Turns out it was my shoes on the cheap synthetic carpet tiles at work; every time I walked to the kitchen I was "charging up" owing to friction. Google for "Antistatic Heel Grounder" or "ESD footwear".
$endgroup$
– Rab
May 17 at 15:44
3
$begingroup$
Some chairs have synthetic fabrics that build up a lot of charge when you sit down in / get up from them.
$endgroup$
– W5VO♦
May 17 at 16:16
18
18
$begingroup$
is there a reason you can't use a standard ESD wrist strap?
$endgroup$
– Puffafish
May 17 at 8:26
$begingroup$
is there a reason you can't use a standard ESD wrist strap?
$endgroup$
– Puffafish
May 17 at 8:26
4
4
$begingroup$
When I return to my desk, I ground myself on a conductor. There are an order of magnitude fewer nerve cells in the outside of a knuckle than the pad of a fingertip, so I lightly punch it, rather than use my finger.
$endgroup$
– Neil_UK
May 17 at 12:44
$begingroup$
When I return to my desk, I ground myself on a conductor. There are an order of magnitude fewer nerve cells in the outside of a knuckle than the pad of a fingertip, so I lightly punch it, rather than use my finger.
$endgroup$
– Neil_UK
May 17 at 12:44
6
6
$begingroup$
The old school, though not entirely professional way, is to grab a radiator before touching electronics with your hands. (That is, the stuff that heats your building, not stuff that gives out radio waves. Silly English language.)
$endgroup$
– Lundin
May 17 at 13:48
$begingroup$
The old school, though not entirely professional way, is to grab a radiator before touching electronics with your hands. (That is, the stuff that heats your building, not stuff that gives out radio waves. Silly English language.)
$endgroup$
– Lundin
May 17 at 13:48
10
10
$begingroup$
Dude, I had exactly this problem. The static was so significant, on one occasion I touched the backplate of a network card which instantly threw a network error on the computer's screen. The NIC refused to work again until the PC was rebooted. Vending machines would reboot themselves when I touched the coin slot. Turns out it was my shoes on the cheap synthetic carpet tiles at work; every time I walked to the kitchen I was "charging up" owing to friction. Google for "Antistatic Heel Grounder" or "ESD footwear".
$endgroup$
– Rab
May 17 at 15:44
$begingroup$
Dude, I had exactly this problem. The static was so significant, on one occasion I touched the backplate of a network card which instantly threw a network error on the computer's screen. The NIC refused to work again until the PC was rebooted. Vending machines would reboot themselves when I touched the coin slot. Turns out it was my shoes on the cheap synthetic carpet tiles at work; every time I walked to the kitchen I was "charging up" owing to friction. Google for "Antistatic Heel Grounder" or "ESD footwear".
$endgroup$
– Rab
May 17 at 15:44
3
3
$begingroup$
Some chairs have synthetic fabrics that build up a lot of charge when you sit down in / get up from them.
$endgroup$
– W5VO♦
May 17 at 16:16
$begingroup$
Some chairs have synthetic fabrics that build up a lot of charge when you sit down in / get up from them.
$endgroup$
– W5VO♦
May 17 at 16:16
|
show 8 more comments
11 Answers
11
active
oldest
votes
$begingroup$
The best way is to use an ESD strap, that is connected to earth via a 1MOhm resistor. This slowly but continuously discharges you without creating high currents. This way it does not hurt or damage anything.
But I also want to mention one "trick", when you dont want to use special equipment like an ESD strap. Discharging at the earth connection of mains works quite well, when you do not touch the contact directly but via an object you are holding in your hand (and that is at least slightly conductiv). I always get a big discharge when touching doorknobs at work, so I started to first touch the knob with my watch. This way the spark only exists between watch an knob, the current densitiy in my arm is already so low that I do not feel it any more. Or when getting out of car I already have the key in my hand - so I touch the door with the key first, before touching the metal directly.
But still - if your are regularyly working with electronics on your desk some basic ESD equipment would be the best solution. And I guess your boss will agree that the cost of an ESD strap is neglectable im comparison to failing electronics ;)
answered May 17 at 9:07
jusacajusaca
2,8932 gold badges11 silver badges35 bronze badges
$endgroup$
$begingroup$
Sounds like a great way to ruin a watch - unless it's a purely mechanical one. A watch with any kind of electronics in it might be killed by doing that...
$endgroup$
– Darrel Hoffman
May 17 at 13:23
3
$begingroup$
@DarrelHoffman No. A properly designed digital watch has to be able to withstand thousands of kV contact discharge to be put on market. Even more so through air discharge. So if your watch breaks from touching a door knob, it doesn't live up to for example the European EMC directive.
$endgroup$
– Lundin
May 17 at 13:54
1
$begingroup$
If you don't have a conductive object, using the back of your hand works well. The back of the hand isn't as innervated as the fingertips, so static shocks feel much less painful.
$endgroup$
– Wayne Conrad
May 17 at 19:43
3
$begingroup$
I think you do not feel the pain of discharge trough your watch because the area in contact with your skin is larger hence the amount of electricity passing through a single point is lower. In an open space office where the chairs were very prone to charging us we engaged in a spark war. My ultimate weapon was a metalic spoon. I felt nothing while discharging on my workmates neck/ears... ;-)
$endgroup$
– bokan
May 17 at 22:44
add a comment
|
$begingroup$
You can use a ESD mat, which is directly connected to the electrical ground. Just place it under your electronics and wear the connected bracelet when you are working with them. Touching the mat when you arrive at your desk would also discharge the static charge without affecting your PC.
Image source
answered May 17 at 8:41
BoraBora
3463 bronze badges
$endgroup$
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Do these mats/bracelets have internal resistors? Or is it like touching the earth directly?
$endgroup$
– Karsten
May 17 at 8:48
5
$begingroup$
According to ANSI/ESD S4.1, the surface resistance has to be between 10^6 Ohm and 10^12 Ohm. A high-quality ESD mat would conform to these standards.
$endgroup$
– Bora
May 17 at 9:07
2
$begingroup$
@Karsten working with a hand connected 'hard' to safety ground would significantly increase the risk or electric shock (given some other fault condition). Therefore the mat must have redundant/fail safe internal resistance.
$endgroup$
– Sean Houlihane
May 17 at 10:00
3
$begingroup$
@Karsten it is worth noting that while "A high-quality ESD mat would conform" and "the mat must have redundant/fail safe internal resistance" you can still encounter low quality ones that do not. Thus, only buy from reputable sources, and it never hurts to measure resistance before first use.
$endgroup$
– Mołot
May 17 at 13:35
2
$begingroup$
@Karsten wrist straps usually come with a resistor to protect you when you accidentally touch a live connection when you are wearing the wristband
$endgroup$
– Ferrybig
May 17 at 17:52
add a comment
|
$begingroup$
The best conditions for static generation and discharge are;
- dry air,
- neoprene soled shoes
- nylon seat cover,
- nylon carpet.
- and holding a metal key or pen to discharge to another metal object.
So reducing these effects comes from using;
- leather shoes (sweat) or better,
- ESD approved heel straps or best,
- ESD shoes paid for by your employer ($)
- with anti-static generating clothing
- over weekly anti-stat sprayed carpet and chair
- or better ESD approved materials
- with an alternating polarity air ionizer
- and raised humidity for extremely dry conditions.
I suspect it is the combinations of your shoes-carpet, clothes-chair with the friction that generate the triboelectric static.
answered May 17 at 9:47
Sunnyskyguy EE75Sunnyskyguy EE75
81.4k2 gold badges31 silver badges118 bronze badges
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Carry around a 1MOhm resistor and touch one end to something grounded while holding the other end, or just get an ESD bracelet and wear it.
answered May 17 at 8:26
Andrew MacraeAndrew Macrae
8191 silver badge14 bronze badges
$endgroup$
$begingroup$
But the ESD bracelet hat to be connected to something, doesn't it? When I leave my desk I would have to unplug it and replug it when I am coming back. Wouldn't that be almost the same as what I am doing now. As far as I know the bracelet does not prevent the collection of charge as long as it is not connected to anything.
$endgroup$
– Karsten
May 17 at 8:29
$begingroup$
Yeah, depending on your floor, there are also straps that go over your ankle and ground you to the floor, and you can always ground yourself to an ESD mat (which is a higher impedance path to ground which means less ESD and current)
$endgroup$
– Andrew Macrae
May 17 at 8:38
1
$begingroup$
The esd bracelet will dissipate the charge slowly so that you won't feel it. I say "slowly" but it is fast enough. You don't have to count to 20 or anything like that. You will be equipotential in less than a second.
$endgroup$
– mkeith
May 19 at 3:14
add a comment
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I have the same problem at my workplace where the floor is carpet. For some periods, I get several shocks a day touching metal doors, my laptop or sometimes the contacts of VGA or Ethernet cables.
I now carry around a resistor (600 kOhm but anything around 1 MOhm would be fine) and discharge myself through it before touching anything previously mentionned with my bare hands. This allows static charge to flow slower such that you won't feel it.
answered May 17 at 11:40
user222212user222212
511 bronze badge
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While resistors and static mats are great for a professional electronics handler, I suspect most people would find carrying them around just for this purpose to be burdensome.
The resistors in the above systems slow the rate at which the current passes out of you reducing the shock. But you get the same effect by increasing the amount of skin in the circuit rather than decreasing the current flow.
I am unlikely to be without my key ring anytime I am likely to be touching electronics, so I take my key ring, hold it firmly to maximize skin area in electrical contact with the keys, and stick out the tip of one of the keys to touch the light switch-plate mounting screws as I enter the room. I make sure to press forward on the proffered key while doing this to insure it is in contact with the key ring itself and by extension all of my in-contact skin.
The screws are earthed through the switch itself and thus dissipate the potential, but without overly drawing it from one small spot of your skin, reducing the static shock to virtual insignificance. You could touch your mains outlet the same way.
In earlier times I always had a small pocket screwdriver clipped in my pocket that I used for the same thing which was even more convenient, albeit with less surface area, but they are difficult to find anymore and I have stopped carrying them.
answered May 17 at 18:24
bobbob
291 bronze badge
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ESD pad and wristband are the correct solution when working at your desk.
When you are away from your desk, you can use ESD foot straps. They are inexpensive and can be bought from various vendors. As a DIY solution, you can try aluminum tape that goes from the inside of your shoe and around to the bottom.
answered May 19 at 3:03
Ofer NaamanOfer Naaman
565 bronze badges
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When there is no professional setup at hand and I still need to touch the circuit boards with my hands, I simply wash my hands in the bathroom before doing so. I believe the static is discharged through the running water into the ground.
answered May 20 at 6:34
h22h22
2992 silver badges10 bronze badges
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This is a fascinating discussion. I was always told that you can't earth static electricity charge you can only reduce its potential. This is why back in the 1960s on British roads you often saw people driving a car with a chain dangling from the rear bumper and usually it was dragging on the ground as the car went along which did nothing to reduce static. It was believed by many that removing static reduced car-sickness for affected passengers. But the proper way to deploy the chain was so that it almost reached the ground. My father used to hold the ignition key between thumb and first finger as he slid out of the seat (static generated by the seat of his pants) and he'd touch the key on the door frame as he stood up. This discharged the static from his body and it dissipated through the bodywork. A spark would visibly jump off the key as he touched the body. He also switched to leather soled shoes which helped compared to Neoprene soles.
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3
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Welcome to EE.SE, Larry. Please note that this isn't a forum of the type you may be used to and answers have to be actual answers and not a "discussion" as you seem to think. I think your answer has enough relevant material to stand as an answer. Please take the Tour to learn how the site works. Note that answers float up and down with voting or user sorting preference. One of my work colleagues solved the car static problem by letting his wife get out first!
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– Transistor
May 18 at 10:29
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Take a habit of wearing ESD shoes at work. These slowly drain the charge as you walk, and if you're picking up the charge from the carpet, they prevent it from accumulating in the first place.
The main advantage is that once you put ESD shoes on, there's no protocol to follow. You can't forget to put a strip back on when you return to your desk, touch a metal object etc. You're really protected 100% of the time while walking freely around the office.
answered May 20 at 10:52
Dmitry GrigoryevDmitry Grigoryev
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Old school solution is to touch the grounded chassis first with one hand while using the other to handle sensitive devices. Never had a failure doing this.
answered May 20 at 12:33
SamRSamR
658 bronze badges
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protected by W5VO♦ May 20 at 14:56
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11 Answers
11
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11 Answers
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active
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$begingroup$
The best way is to use an ESD strap, that is connected to earth via a 1MOhm resistor. This slowly but continuously discharges you without creating high currents. This way it does not hurt or damage anything.
But I also want to mention one "trick", when you dont want to use special equipment like an ESD strap. Discharging at the earth connection of mains works quite well, when you do not touch the contact directly but via an object you are holding in your hand (and that is at least slightly conductiv). I always get a big discharge when touching doorknobs at work, so I started to first touch the knob with my watch. This way the spark only exists between watch an knob, the current densitiy in my arm is already so low that I do not feel it any more. Or when getting out of car I already have the key in my hand - so I touch the door with the key first, before touching the metal directly.
But still - if your are regularyly working with electronics on your desk some basic ESD equipment would be the best solution. And I guess your boss will agree that the cost of an ESD strap is neglectable im comparison to failing electronics ;)
answered May 17 at 9:07
jusacajusaca
2,8932 gold badges11 silver badges35 bronze badges
$endgroup$
$begingroup$
Sounds like a great way to ruin a watch - unless it's a purely mechanical one. A watch with any kind of electronics in it might be killed by doing that...
$endgroup$
– Darrel Hoffman
May 17 at 13:23
3
$begingroup$
@DarrelHoffman No. A properly designed digital watch has to be able to withstand thousands of kV contact discharge to be put on market. Even more so through air discharge. So if your watch breaks from touching a door knob, it doesn't live up to for example the European EMC directive.
$endgroup$
– Lundin
May 17 at 13:54
1
$begingroup$
If you don't have a conductive object, using the back of your hand works well. The back of the hand isn't as innervated as the fingertips, so static shocks feel much less painful.
$endgroup$
– Wayne Conrad
May 17 at 19:43
3
$begingroup$
I think you do not feel the pain of discharge trough your watch because the area in contact with your skin is larger hence the amount of electricity passing through a single point is lower. In an open space office where the chairs were very prone to charging us we engaged in a spark war. My ultimate weapon was a metalic spoon. I felt nothing while discharging on my workmates neck/ears... ;-)
$endgroup$
– bokan
May 17 at 22:44
add a comment
|
$begingroup$
The best way is to use an ESD strap, that is connected to earth via a 1MOhm resistor. This slowly but continuously discharges you without creating high currents. This way it does not hurt or damage anything.
But I also want to mention one "trick", when you dont want to use special equipment like an ESD strap. Discharging at the earth connection of mains works quite well, when you do not touch the contact directly but via an object you are holding in your hand (and that is at least slightly conductiv). I always get a big discharge when touching doorknobs at work, so I started to first touch the knob with my watch. This way the spark only exists between watch an knob, the current densitiy in my arm is already so low that I do not feel it any more. Or when getting out of car I already have the key in my hand - so I touch the door with the key first, before touching the metal directly.
But still - if your are regularyly working with electronics on your desk some basic ESD equipment would be the best solution. And I guess your boss will agree that the cost of an ESD strap is neglectable im comparison to failing electronics ;)
answered May 17 at 9:07
jusacajusaca
2,8932 gold badges11 silver badges35 bronze badges
$endgroup$
$begingroup$
Sounds like a great way to ruin a watch - unless it's a purely mechanical one. A watch with any kind of electronics in it might be killed by doing that...
$endgroup$
– Darrel Hoffman
May 17 at 13:23
3
$begingroup$
@DarrelHoffman No. A properly designed digital watch has to be able to withstand thousands of kV contact discharge to be put on market. Even more so through air discharge. So if your watch breaks from touching a door knob, it doesn't live up to for example the European EMC directive.
$endgroup$
– Lundin
May 17 at 13:54
1
$begingroup$
If you don't have a conductive object, using the back of your hand works well. The back of the hand isn't as innervated as the fingertips, so static shocks feel much less painful.
$endgroup$
– Wayne Conrad
May 17 at 19:43
3
$begingroup$
I think you do not feel the pain of discharge trough your watch because the area in contact with your skin is larger hence the amount of electricity passing through a single point is lower. In an open space office where the chairs were very prone to charging us we engaged in a spark war. My ultimate weapon was a metalic spoon. I felt nothing while discharging on my workmates neck/ears... ;-)
$endgroup$
– bokan
May 17 at 22:44
add a comment
|
$begingroup$
The best way is to use an ESD strap, that is connected to earth via a 1MOhm resistor. This slowly but continuously discharges you without creating high currents. This way it does not hurt or damage anything.
But I also want to mention one "trick", when you dont want to use special equipment like an ESD strap. Discharging at the earth connection of mains works quite well, when you do not touch the contact directly but via an object you are holding in your hand (and that is at least slightly conductiv). I always get a big discharge when touching doorknobs at work, so I started to first touch the knob with my watch. This way the spark only exists between watch an knob, the current densitiy in my arm is already so low that I do not feel it any more. Or when getting out of car I already have the key in my hand - so I touch the door with the key first, before touching the metal directly.
But still - if your are regularyly working with electronics on your desk some basic ESD equipment would be the best solution. And I guess your boss will agree that the cost of an ESD strap is neglectable im comparison to failing electronics ;)
answered May 17 at 9:07
jusacajusaca
2,8932 gold badges11 silver badges35 bronze badges
$endgroup$
The best way is to use an ESD strap, that is connected to earth via a 1MOhm resistor. This slowly but continuously discharges you without creating high currents. This way it does not hurt or damage anything.
But I also want to mention one "trick", when you dont want to use special equipment like an ESD strap. Discharging at the earth connection of mains works quite well, when you do not touch the contact directly but via an object you are holding in your hand (and that is at least slightly conductiv). I always get a big discharge when touching doorknobs at work, so I started to first touch the knob with my watch. This way the spark only exists between watch an knob, the current densitiy in my arm is already so low that I do not feel it any more. Or when getting out of car I already have the key in my hand - so I touch the door with the key first, before touching the metal directly.
But still - if your are regularyly working with electronics on your desk some basic ESD equipment would be the best solution. And I guess your boss will agree that the cost of an ESD strap is neglectable im comparison to failing electronics ;)
answered May 17 at 9:07
jusacajusaca
2,8932 gold badges11 silver badges35 bronze badges
edited May 17 at 12:21
answered May 17 at 9:07
jusacajusaca
2,8932 gold badges11 silver badges35 bronze badges
answered May 17 at 9:07
jusacajusaca
2,8932 gold badges11 silver badges35 bronze badges
answered May 17 at 9:07
jusacajusaca
2,8932 gold badges11 silver badges35 bronze badges
2,8932 gold badges11 silver badges35 bronze badges
$begingroup$
Sounds like a great way to ruin a watch - unless it's a purely mechanical one. A watch with any kind of electronics in it might be killed by doing that...
$endgroup$
– Darrel Hoffman
May 17 at 13:23
3
$begingroup$
@DarrelHoffman No. A properly designed digital watch has to be able to withstand thousands of kV contact discharge to be put on market. Even more so through air discharge. So if your watch breaks from touching a door knob, it doesn't live up to for example the European EMC directive.
$endgroup$
– Lundin
May 17 at 13:54
1
$begingroup$
If you don't have a conductive object, using the back of your hand works well. The back of the hand isn't as innervated as the fingertips, so static shocks feel much less painful.
$endgroup$
– Wayne Conrad
May 17 at 19:43
3
$begingroup$
I think you do not feel the pain of discharge trough your watch because the area in contact with your skin is larger hence the amount of electricity passing through a single point is lower. In an open space office where the chairs were very prone to charging us we engaged in a spark war. My ultimate weapon was a metalic spoon. I felt nothing while discharging on my workmates neck/ears... ;-)
$endgroup$
– bokan
May 17 at 22:44
add a comment
|
$begingroup$
Sounds like a great way to ruin a watch - unless it's a purely mechanical one. A watch with any kind of electronics in it might be killed by doing that...
$endgroup$
– Darrel Hoffman
May 17 at 13:23
3
$begingroup$
@DarrelHoffman No. A properly designed digital watch has to be able to withstand thousands of kV contact discharge to be put on market. Even more so through air discharge. So if your watch breaks from touching a door knob, it doesn't live up to for example the European EMC directive.
$endgroup$
– Lundin
May 17 at 13:54
1
$begingroup$
If you don't have a conductive object, using the back of your hand works well. The back of the hand isn't as innervated as the fingertips, so static shocks feel much less painful.
$endgroup$
– Wayne Conrad
May 17 at 19:43
3
$begingroup$
I think you do not feel the pain of discharge trough your watch because the area in contact with your skin is larger hence the amount of electricity passing through a single point is lower. In an open space office where the chairs were very prone to charging us we engaged in a spark war. My ultimate weapon was a metalic spoon. I felt nothing while discharging on my workmates neck/ears... ;-)
$endgroup$
– bokan
May 17 at 22:44
$begingroup$
Sounds like a great way to ruin a watch - unless it's a purely mechanical one. A watch with any kind of electronics in it might be killed by doing that...
$endgroup$
– Darrel Hoffman
May 17 at 13:23
$begingroup$
Sounds like a great way to ruin a watch - unless it's a purely mechanical one. A watch with any kind of electronics in it might be killed by doing that...
$endgroup$
– Darrel Hoffman
May 17 at 13:23
3
3
$begingroup$
@DarrelHoffman No. A properly designed digital watch has to be able to withstand thousands of kV contact discharge to be put on market. Even more so through air discharge. So if your watch breaks from touching a door knob, it doesn't live up to for example the European EMC directive.
$endgroup$
– Lundin
May 17 at 13:54
$begingroup$
@DarrelHoffman No. A properly designed digital watch has to be able to withstand thousands of kV contact discharge to be put on market. Even more so through air discharge. So if your watch breaks from touching a door knob, it doesn't live up to for example the European EMC directive.
$endgroup$
– Lundin
May 17 at 13:54
1
1
$begingroup$
If you don't have a conductive object, using the back of your hand works well. The back of the hand isn't as innervated as the fingertips, so static shocks feel much less painful.
$endgroup$
– Wayne Conrad
May 17 at 19:43
$begingroup$
If you don't have a conductive object, using the back of your hand works well. The back of the hand isn't as innervated as the fingertips, so static shocks feel much less painful.
$endgroup$
– Wayne Conrad
May 17 at 19:43
3
3
$begingroup$
I think you do not feel the pain of discharge trough your watch because the area in contact with your skin is larger hence the amount of electricity passing through a single point is lower. In an open space office where the chairs were very prone to charging us we engaged in a spark war. My ultimate weapon was a metalic spoon. I felt nothing while discharging on my workmates neck/ears... ;-)
$endgroup$
– bokan
May 17 at 22:44
$begingroup$
I think you do not feel the pain of discharge trough your watch because the area in contact with your skin is larger hence the amount of electricity passing through a single point is lower. In an open space office where the chairs were very prone to charging us we engaged in a spark war. My ultimate weapon was a metalic spoon. I felt nothing while discharging on my workmates neck/ears... ;-)
$endgroup$
– bokan
May 17 at 22:44
add a comment
|
$begingroup$
You can use a ESD mat, which is directly connected to the electrical ground. Just place it under your electronics and wear the connected bracelet when you are working with them. Touching the mat when you arrive at your desk would also discharge the static charge without affecting your PC.
Image source
answered May 17 at 8:41
BoraBora
3463 bronze badges
$endgroup$
$begingroup$
Do these mats/bracelets have internal resistors? Or is it like touching the earth directly?
$endgroup$
– Karsten
May 17 at 8:48
5
$begingroup$
According to ANSI/ESD S4.1, the surface resistance has to be between 10^6 Ohm and 10^12 Ohm. A high-quality ESD mat would conform to these standards.
$endgroup$
– Bora
May 17 at 9:07
2
$begingroup$
@Karsten working with a hand connected 'hard' to safety ground would significantly increase the risk or electric shock (given some other fault condition). Therefore the mat must have redundant/fail safe internal resistance.
$endgroup$
– Sean Houlihane
May 17 at 10:00
3
$begingroup$
@Karsten it is worth noting that while "A high-quality ESD mat would conform" and "the mat must have redundant/fail safe internal resistance" you can still encounter low quality ones that do not. Thus, only buy from reputable sources, and it never hurts to measure resistance before first use.
$endgroup$
– Mołot
May 17 at 13:35
2
$begingroup$
@Karsten wrist straps usually come with a resistor to protect you when you accidentally touch a live connection when you are wearing the wristband
$endgroup$
– Ferrybig
May 17 at 17:52
add a comment
|
$begingroup$
You can use a ESD mat, which is directly connected to the electrical ground. Just place it under your electronics and wear the connected bracelet when you are working with them. Touching the mat when you arrive at your desk would also discharge the static charge without affecting your PC.
Image source
answered May 17 at 8:41
BoraBora
3463 bronze badges
$endgroup$
$begingroup$
Do these mats/bracelets have internal resistors? Or is it like touching the earth directly?
$endgroup$
– Karsten
May 17 at 8:48
5
$begingroup$
According to ANSI/ESD S4.1, the surface resistance has to be between 10^6 Ohm and 10^12 Ohm. A high-quality ESD mat would conform to these standards.
$endgroup$
– Bora
May 17 at 9:07
2
$begingroup$
@Karsten working with a hand connected 'hard' to safety ground would significantly increase the risk or electric shock (given some other fault condition). Therefore the mat must have redundant/fail safe internal resistance.
$endgroup$
– Sean Houlihane
May 17 at 10:00
3
$begingroup$
@Karsten it is worth noting that while "A high-quality ESD mat would conform" and "the mat must have redundant/fail safe internal resistance" you can still encounter low quality ones that do not. Thus, only buy from reputable sources, and it never hurts to measure resistance before first use.
$endgroup$
– Mołot
May 17 at 13:35
2
$begingroup$
@Karsten wrist straps usually come with a resistor to protect you when you accidentally touch a live connection when you are wearing the wristband
$endgroup$
– Ferrybig
May 17 at 17:52
add a comment
|
$begingroup$
You can use a ESD mat, which is directly connected to the electrical ground. Just place it under your electronics and wear the connected bracelet when you are working with them. Touching the mat when you arrive at your desk would also discharge the static charge without affecting your PC.
Image source
answered May 17 at 8:41
BoraBora
3463 bronze badges
$endgroup$
You can use a ESD mat, which is directly connected to the electrical ground. Just place it under your electronics and wear the connected bracelet when you are working with them. Touching the mat when you arrive at your desk would also discharge the static charge without affecting your PC.
Image source
answered May 17 at 8:41
BoraBora
3463 bronze badges
edited May 17 at 13:42
answered May 17 at 8:41
BoraBora
3463 bronze badges
answered May 17 at 8:41
BoraBora
3463 bronze badges
answered May 17 at 8:41
BoraBora
3463 bronze badges
3463 bronze badges
$begingroup$
Do these mats/bracelets have internal resistors? Or is it like touching the earth directly?
$endgroup$
– Karsten
May 17 at 8:48
5
$begingroup$
According to ANSI/ESD S4.1, the surface resistance has to be between 10^6 Ohm and 10^12 Ohm. A high-quality ESD mat would conform to these standards.
$endgroup$
– Bora
May 17 at 9:07
2
$begingroup$
@Karsten working with a hand connected 'hard' to safety ground would significantly increase the risk or electric shock (given some other fault condition). Therefore the mat must have redundant/fail safe internal resistance.
$endgroup$
– Sean Houlihane
May 17 at 10:00
3
$begingroup$
@Karsten it is worth noting that while "A high-quality ESD mat would conform" and "the mat must have redundant/fail safe internal resistance" you can still encounter low quality ones that do not. Thus, only buy from reputable sources, and it never hurts to measure resistance before first use.
$endgroup$
– Mołot
May 17 at 13:35
2
$begingroup$
@Karsten wrist straps usually come with a resistor to protect you when you accidentally touch a live connection when you are wearing the wristband
$endgroup$
– Ferrybig
May 17 at 17:52
add a comment
|
$begingroup$
Do these mats/bracelets have internal resistors? Or is it like touching the earth directly?
$endgroup$
– Karsten
May 17 at 8:48
5
$begingroup$
According to ANSI/ESD S4.1, the surface resistance has to be between 10^6 Ohm and 10^12 Ohm. A high-quality ESD mat would conform to these standards.
$endgroup$
– Bora
May 17 at 9:07
2
$begingroup$
@Karsten working with a hand connected 'hard' to safety ground would significantly increase the risk or electric shock (given some other fault condition). Therefore the mat must have redundant/fail safe internal resistance.
$endgroup$
– Sean Houlihane
May 17 at 10:00
3
$begingroup$
@Karsten it is worth noting that while "A high-quality ESD mat would conform" and "the mat must have redundant/fail safe internal resistance" you can still encounter low quality ones that do not. Thus, only buy from reputable sources, and it never hurts to measure resistance before first use.
$endgroup$
– Mołot
May 17 at 13:35
2
$begingroup$
@Karsten wrist straps usually come with a resistor to protect you when you accidentally touch a live connection when you are wearing the wristband
$endgroup$
– Ferrybig
May 17 at 17:52
$begingroup$
Do these mats/bracelets have internal resistors? Or is it like touching the earth directly?
$endgroup$
– Karsten
May 17 at 8:48
$begingroup$
Do these mats/bracelets have internal resistors? Or is it like touching the earth directly?
$endgroup$
– Karsten
May 17 at 8:48
5
5
$begingroup$
According to ANSI/ESD S4.1, the surface resistance has to be between 10^6 Ohm and 10^12 Ohm. A high-quality ESD mat would conform to these standards.
$endgroup$
– Bora
May 17 at 9:07
$begingroup$
According to ANSI/ESD S4.1, the surface resistance has to be between 10^6 Ohm and 10^12 Ohm. A high-quality ESD mat would conform to these standards.
$endgroup$
– Bora
May 17 at 9:07
2
2
$begingroup$
@Karsten working with a hand connected 'hard' to safety ground would significantly increase the risk or electric shock (given some other fault condition). Therefore the mat must have redundant/fail safe internal resistance.
$endgroup$
– Sean Houlihane
May 17 at 10:00
$begingroup$
@Karsten working with a hand connected 'hard' to safety ground would significantly increase the risk or electric shock (given some other fault condition). Therefore the mat must have redundant/fail safe internal resistance.
$endgroup$
– Sean Houlihane
May 17 at 10:00
3
3
$begingroup$
@Karsten it is worth noting that while "A high-quality ESD mat would conform" and "the mat must have redundant/fail safe internal resistance" you can still encounter low quality ones that do not. Thus, only buy from reputable sources, and it never hurts to measure resistance before first use.
$endgroup$
– Mołot
May 17 at 13:35
$begingroup$
@Karsten it is worth noting that while "A high-quality ESD mat would conform" and "the mat must have redundant/fail safe internal resistance" you can still encounter low quality ones that do not. Thus, only buy from reputable sources, and it never hurts to measure resistance before first use.
$endgroup$
– Mołot
May 17 at 13:35
2
2
$begingroup$
@Karsten wrist straps usually come with a resistor to protect you when you accidentally touch a live connection when you are wearing the wristband
$endgroup$
– Ferrybig
May 17 at 17:52
$begingroup$
@Karsten wrist straps usually come with a resistor to protect you when you accidentally touch a live connection when you are wearing the wristband
$endgroup$
– Ferrybig
May 17 at 17:52
add a comment
|
$begingroup$
The best conditions for static generation and discharge are;
- dry air,
- neoprene soled shoes
- nylon seat cover,
- nylon carpet.
- and holding a metal key or pen to discharge to another metal object.
So reducing these effects comes from using;
- leather shoes (sweat) or better,
- ESD approved heel straps or best,
- ESD shoes paid for by your employer ($)
- with anti-static generating clothing
- over weekly anti-stat sprayed carpet and chair
- or better ESD approved materials
- with an alternating polarity air ionizer
- and raised humidity for extremely dry conditions.
I suspect it is the combinations of your shoes-carpet, clothes-chair with the friction that generate the triboelectric static.
answered May 17 at 9:47
Sunnyskyguy EE75Sunnyskyguy EE75
81.4k2 gold badges31 silver badges118 bronze badges
$endgroup$
add a comment
|
$begingroup$
The best conditions for static generation and discharge are;
- dry air,
- neoprene soled shoes
- nylon seat cover,
- nylon carpet.
- and holding a metal key or pen to discharge to another metal object.
So reducing these effects comes from using;
- leather shoes (sweat) or better,
- ESD approved heel straps or best,
- ESD shoes paid for by your employer ($)
- with anti-static generating clothing
- over weekly anti-stat sprayed carpet and chair
- or better ESD approved materials
- with an alternating polarity air ionizer
- and raised humidity for extremely dry conditions.
I suspect it is the combinations of your shoes-carpet, clothes-chair with the friction that generate the triboelectric static.
answered May 17 at 9:47
Sunnyskyguy EE75Sunnyskyguy EE75
81.4k2 gold badges31 silver badges118 bronze badges
$endgroup$
add a comment
|
$begingroup$
The best conditions for static generation and discharge are;
- dry air,
- neoprene soled shoes
- nylon seat cover,
- nylon carpet.
- and holding a metal key or pen to discharge to another metal object.
So reducing these effects comes from using;
- leather shoes (sweat) or better,
- ESD approved heel straps or best,
- ESD shoes paid for by your employer ($)
- with anti-static generating clothing
- over weekly anti-stat sprayed carpet and chair
- or better ESD approved materials
- with an alternating polarity air ionizer
- and raised humidity for extremely dry conditions.
I suspect it is the combinations of your shoes-carpet, clothes-chair with the friction that generate the triboelectric static.
answered May 17 at 9:47
Sunnyskyguy EE75Sunnyskyguy EE75
81.4k2 gold badges31 silver badges118 bronze badges
$endgroup$
The best conditions for static generation and discharge are;
- dry air,
- neoprene soled shoes
- nylon seat cover,
- nylon carpet.
- and holding a metal key or pen to discharge to another metal object.
So reducing these effects comes from using;
- leather shoes (sweat) or better,
- ESD approved heel straps or best,
- ESD shoes paid for by your employer ($)
- with anti-static generating clothing
- over weekly anti-stat sprayed carpet and chair
- or better ESD approved materials
- with an alternating polarity air ionizer
- and raised humidity for extremely dry conditions.
I suspect it is the combinations of your shoes-carpet, clothes-chair with the friction that generate the triboelectric static.
answered May 17 at 9:47
Sunnyskyguy EE75Sunnyskyguy EE75
81.4k2 gold badges31 silver badges118 bronze badges
answered May 17 at 9:47
Sunnyskyguy EE75Sunnyskyguy EE75
81.4k2 gold badges31 silver badges118 bronze badges
answered May 17 at 9:47
Sunnyskyguy EE75Sunnyskyguy EE75
81.4k2 gold badges31 silver badges118 bronze badges
answered May 17 at 9:47
Sunnyskyguy EE75Sunnyskyguy EE75
81.4k2 gold badges31 silver badges118 bronze badges
81.4k2 gold badges31 silver badges118 bronze badges
add a comment
|
add a comment
|
$begingroup$
Carry around a 1MOhm resistor and touch one end to something grounded while holding the other end, or just get an ESD bracelet and wear it.
answered May 17 at 8:26
Andrew MacraeAndrew Macrae
8191 silver badge14 bronze badges
$endgroup$
$begingroup$
But the ESD bracelet hat to be connected to something, doesn't it? When I leave my desk I would have to unplug it and replug it when I am coming back. Wouldn't that be almost the same as what I am doing now. As far as I know the bracelet does not prevent the collection of charge as long as it is not connected to anything.
$endgroup$
– Karsten
May 17 at 8:29
$begingroup$
Yeah, depending on your floor, there are also straps that go over your ankle and ground you to the floor, and you can always ground yourself to an ESD mat (which is a higher impedance path to ground which means less ESD and current)
$endgroup$
– Andrew Macrae
May 17 at 8:38
1
$begingroup$
The esd bracelet will dissipate the charge slowly so that you won't feel it. I say "slowly" but it is fast enough. You don't have to count to 20 or anything like that. You will be equipotential in less than a second.
$endgroup$
– mkeith
May 19 at 3:14
add a comment
|
$begingroup$
Carry around a 1MOhm resistor and touch one end to something grounded while holding the other end, or just get an ESD bracelet and wear it.
answered May 17 at 8:26
Andrew MacraeAndrew Macrae
8191 silver badge14 bronze badges
$endgroup$
$begingroup$
But the ESD bracelet hat to be connected to something, doesn't it? When I leave my desk I would have to unplug it and replug it when I am coming back. Wouldn't that be almost the same as what I am doing now. As far as I know the bracelet does not prevent the collection of charge as long as it is not connected to anything.
$endgroup$
– Karsten
May 17 at 8:29
$begingroup$
Yeah, depending on your floor, there are also straps that go over your ankle and ground you to the floor, and you can always ground yourself to an ESD mat (which is a higher impedance path to ground which means less ESD and current)
$endgroup$
– Andrew Macrae
May 17 at 8:38
1
$begingroup$
The esd bracelet will dissipate the charge slowly so that you won't feel it. I say "slowly" but it is fast enough. You don't have to count to 20 or anything like that. You will be equipotential in less than a second.
$endgroup$
– mkeith
May 19 at 3:14
add a comment
|
$begingroup$
Carry around a 1MOhm resistor and touch one end to something grounded while holding the other end, or just get an ESD bracelet and wear it.
answered May 17 at 8:26
Andrew MacraeAndrew Macrae
8191 silver badge14 bronze badges
$endgroup$
Carry around a 1MOhm resistor and touch one end to something grounded while holding the other end, or just get an ESD bracelet and wear it.
answered May 17 at 8:26
Andrew MacraeAndrew Macrae
8191 silver badge14 bronze badges
answered May 17 at 8:26
Andrew MacraeAndrew Macrae
8191 silver badge14 bronze badges
answered May 17 at 8:26
Andrew MacraeAndrew Macrae
8191 silver badge14 bronze badges
answered May 17 at 8:26
Andrew MacraeAndrew Macrae
8191 silver badge14 bronze badges
8191 silver badge14 bronze badges
$begingroup$
But the ESD bracelet hat to be connected to something, doesn't it? When I leave my desk I would have to unplug it and replug it when I am coming back. Wouldn't that be almost the same as what I am doing now. As far as I know the bracelet does not prevent the collection of charge as long as it is not connected to anything.
$endgroup$
– Karsten
May 17 at 8:29
$begingroup$
Yeah, depending on your floor, there are also straps that go over your ankle and ground you to the floor, and you can always ground yourself to an ESD mat (which is a higher impedance path to ground which means less ESD and current)
$endgroup$
– Andrew Macrae
May 17 at 8:38
1
$begingroup$
The esd bracelet will dissipate the charge slowly so that you won't feel it. I say "slowly" but it is fast enough. You don't have to count to 20 or anything like that. You will be equipotential in less than a second.
$endgroup$
– mkeith
May 19 at 3:14
add a comment
|
$begingroup$
But the ESD bracelet hat to be connected to something, doesn't it? When I leave my desk I would have to unplug it and replug it when I am coming back. Wouldn't that be almost the same as what I am doing now. As far as I know the bracelet does not prevent the collection of charge as long as it is not connected to anything.
$endgroup$
– Karsten
May 17 at 8:29
$begingroup$
Yeah, depending on your floor, there are also straps that go over your ankle and ground you to the floor, and you can always ground yourself to an ESD mat (which is a higher impedance path to ground which means less ESD and current)
$endgroup$
– Andrew Macrae
May 17 at 8:38
1
$begingroup$
The esd bracelet will dissipate the charge slowly so that you won't feel it. I say "slowly" but it is fast enough. You don't have to count to 20 or anything like that. You will be equipotential in less than a second.
$endgroup$
– mkeith
May 19 at 3:14
$begingroup$
But the ESD bracelet hat to be connected to something, doesn't it? When I leave my desk I would have to unplug it and replug it when I am coming back. Wouldn't that be almost the same as what I am doing now. As far as I know the bracelet does not prevent the collection of charge as long as it is not connected to anything.
$endgroup$
– Karsten
May 17 at 8:29
$begingroup$
But the ESD bracelet hat to be connected to something, doesn't it? When I leave my desk I would have to unplug it and replug it when I am coming back. Wouldn't that be almost the same as what I am doing now. As far as I know the bracelet does not prevent the collection of charge as long as it is not connected to anything.
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– Karsten
May 17 at 8:29
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Yeah, depending on your floor, there are also straps that go over your ankle and ground you to the floor, and you can always ground yourself to an ESD mat (which is a higher impedance path to ground which means less ESD and current)
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– Andrew Macrae
May 17 at 8:38
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Yeah, depending on your floor, there are also straps that go over your ankle and ground you to the floor, and you can always ground yourself to an ESD mat (which is a higher impedance path to ground which means less ESD and current)
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– Andrew Macrae
May 17 at 8:38
1
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The esd bracelet will dissipate the charge slowly so that you won't feel it. I say "slowly" but it is fast enough. You don't have to count to 20 or anything like that. You will be equipotential in less than a second.
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– mkeith
May 19 at 3:14
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The esd bracelet will dissipate the charge slowly so that you won't feel it. I say "slowly" but it is fast enough. You don't have to count to 20 or anything like that. You will be equipotential in less than a second.
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– mkeith
May 19 at 3:14
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I have the same problem at my workplace where the floor is carpet. For some periods, I get several shocks a day touching metal doors, my laptop or sometimes the contacts of VGA or Ethernet cables.
I now carry around a resistor (600 kOhm but anything around 1 MOhm would be fine) and discharge myself through it before touching anything previously mentionned with my bare hands. This allows static charge to flow slower such that you won't feel it.
answered May 17 at 11:40
user222212user222212
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I have the same problem at my workplace where the floor is carpet. For some periods, I get several shocks a day touching metal doors, my laptop or sometimes the contacts of VGA or Ethernet cables.
I now carry around a resistor (600 kOhm but anything around 1 MOhm would be fine) and discharge myself through it before touching anything previously mentionned with my bare hands. This allows static charge to flow slower such that you won't feel it.
answered May 17 at 11:40
user222212user222212
511 bronze badge
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add a comment
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I have the same problem at my workplace where the floor is carpet. For some periods, I get several shocks a day touching metal doors, my laptop or sometimes the contacts of VGA or Ethernet cables.
I now carry around a resistor (600 kOhm but anything around 1 MOhm would be fine) and discharge myself through it before touching anything previously mentionned with my bare hands. This allows static charge to flow slower such that you won't feel it.
answered May 17 at 11:40
user222212user222212
511 bronze badge
$endgroup$
I have the same problem at my workplace where the floor is carpet. For some periods, I get several shocks a day touching metal doors, my laptop or sometimes the contacts of VGA or Ethernet cables.
I now carry around a resistor (600 kOhm but anything around 1 MOhm would be fine) and discharge myself through it before touching anything previously mentionned with my bare hands. This allows static charge to flow slower such that you won't feel it.
answered May 17 at 11:40
user222212user222212
511 bronze badge
answered May 17 at 11:40
user222212user222212
511 bronze badge
answered May 17 at 11:40
user222212user222212
511 bronze badge
answered May 17 at 11:40
user222212user222212
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511 bronze badge
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While resistors and static mats are great for a professional electronics handler, I suspect most people would find carrying them around just for this purpose to be burdensome.
The resistors in the above systems slow the rate at which the current passes out of you reducing the shock. But you get the same effect by increasing the amount of skin in the circuit rather than decreasing the current flow.
I am unlikely to be without my key ring anytime I am likely to be touching electronics, so I take my key ring, hold it firmly to maximize skin area in electrical contact with the keys, and stick out the tip of one of the keys to touch the light switch-plate mounting screws as I enter the room. I make sure to press forward on the proffered key while doing this to insure it is in contact with the key ring itself and by extension all of my in-contact skin.
The screws are earthed through the switch itself and thus dissipate the potential, but without overly drawing it from one small spot of your skin, reducing the static shock to virtual insignificance. You could touch your mains outlet the same way.
In earlier times I always had a small pocket screwdriver clipped in my pocket that I used for the same thing which was even more convenient, albeit with less surface area, but they are difficult to find anymore and I have stopped carrying them.
answered May 17 at 18:24
bobbob
291 bronze badge
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While resistors and static mats are great for a professional electronics handler, I suspect most people would find carrying them around just for this purpose to be burdensome.
The resistors in the above systems slow the rate at which the current passes out of you reducing the shock. But you get the same effect by increasing the amount of skin in the circuit rather than decreasing the current flow.
I am unlikely to be without my key ring anytime I am likely to be touching electronics, so I take my key ring, hold it firmly to maximize skin area in electrical contact with the keys, and stick out the tip of one of the keys to touch the light switch-plate mounting screws as I enter the room. I make sure to press forward on the proffered key while doing this to insure it is in contact with the key ring itself and by extension all of my in-contact skin.
The screws are earthed through the switch itself and thus dissipate the potential, but without overly drawing it from one small spot of your skin, reducing the static shock to virtual insignificance. You could touch your mains outlet the same way.
In earlier times I always had a small pocket screwdriver clipped in my pocket that I used for the same thing which was even more convenient, albeit with less surface area, but they are difficult to find anymore and I have stopped carrying them.
answered May 17 at 18:24
bobbob
291 bronze badge
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add a comment
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While resistors and static mats are great for a professional electronics handler, I suspect most people would find carrying them around just for this purpose to be burdensome.
The resistors in the above systems slow the rate at which the current passes out of you reducing the shock. But you get the same effect by increasing the amount of skin in the circuit rather than decreasing the current flow.
I am unlikely to be without my key ring anytime I am likely to be touching electronics, so I take my key ring, hold it firmly to maximize skin area in electrical contact with the keys, and stick out the tip of one of the keys to touch the light switch-plate mounting screws as I enter the room. I make sure to press forward on the proffered key while doing this to insure it is in contact with the key ring itself and by extension all of my in-contact skin.
The screws are earthed through the switch itself and thus dissipate the potential, but without overly drawing it from one small spot of your skin, reducing the static shock to virtual insignificance. You could touch your mains outlet the same way.
In earlier times I always had a small pocket screwdriver clipped in my pocket that I used for the same thing which was even more convenient, albeit with less surface area, but they are difficult to find anymore and I have stopped carrying them.
answered May 17 at 18:24
bobbob
291 bronze badge
$endgroup$
While resistors and static mats are great for a professional electronics handler, I suspect most people would find carrying them around just for this purpose to be burdensome.
The resistors in the above systems slow the rate at which the current passes out of you reducing the shock. But you get the same effect by increasing the amount of skin in the circuit rather than decreasing the current flow.
I am unlikely to be without my key ring anytime I am likely to be touching electronics, so I take my key ring, hold it firmly to maximize skin area in electrical contact with the keys, and stick out the tip of one of the keys to touch the light switch-plate mounting screws as I enter the room. I make sure to press forward on the proffered key while doing this to insure it is in contact with the key ring itself and by extension all of my in-contact skin.
The screws are earthed through the switch itself and thus dissipate the potential, but without overly drawing it from one small spot of your skin, reducing the static shock to virtual insignificance. You could touch your mains outlet the same way.
In earlier times I always had a small pocket screwdriver clipped in my pocket that I used for the same thing which was even more convenient, albeit with less surface area, but they are difficult to find anymore and I have stopped carrying them.
answered May 17 at 18:24
bobbob
291 bronze badge
answered May 17 at 18:24
bobbob
291 bronze badge
answered May 17 at 18:24
bobbob
291 bronze badge
answered May 17 at 18:24
bobbob
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291 bronze badge
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ESD pad and wristband are the correct solution when working at your desk.
When you are away from your desk, you can use ESD foot straps. They are inexpensive and can be bought from various vendors. As a DIY solution, you can try aluminum tape that goes from the inside of your shoe and around to the bottom.
answered May 19 at 3:03
Ofer NaamanOfer Naaman
565 bronze badges
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ESD pad and wristband are the correct solution when working at your desk.
When you are away from your desk, you can use ESD foot straps. They are inexpensive and can be bought from various vendors. As a DIY solution, you can try aluminum tape that goes from the inside of your shoe and around to the bottom.
answered May 19 at 3:03
Ofer NaamanOfer Naaman
565 bronze badges
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add a comment
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ESD pad and wristband are the correct solution when working at your desk.
When you are away from your desk, you can use ESD foot straps. They are inexpensive and can be bought from various vendors. As a DIY solution, you can try aluminum tape that goes from the inside of your shoe and around to the bottom.
answered May 19 at 3:03
Ofer NaamanOfer Naaman
565 bronze badges
$endgroup$
ESD pad and wristband are the correct solution when working at your desk.
When you are away from your desk, you can use ESD foot straps. They are inexpensive and can be bought from various vendors. As a DIY solution, you can try aluminum tape that goes from the inside of your shoe and around to the bottom.
answered May 19 at 3:03
Ofer NaamanOfer Naaman
565 bronze badges
answered May 19 at 3:03
Ofer NaamanOfer Naaman
565 bronze badges
answered May 19 at 3:03
Ofer NaamanOfer Naaman
565 bronze badges
answered May 19 at 3:03
Ofer NaamanOfer Naaman
565 bronze badges
565 bronze badges
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When there is no professional setup at hand and I still need to touch the circuit boards with my hands, I simply wash my hands in the bathroom before doing so. I believe the static is discharged through the running water into the ground.
answered May 20 at 6:34
h22h22
2992 silver badges10 bronze badges
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When there is no professional setup at hand and I still need to touch the circuit boards with my hands, I simply wash my hands in the bathroom before doing so. I believe the static is discharged through the running water into the ground.
answered May 20 at 6:34
h22h22
2992 silver badges10 bronze badges
$endgroup$
add a comment
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When there is no professional setup at hand and I still need to touch the circuit boards with my hands, I simply wash my hands in the bathroom before doing so. I believe the static is discharged through the running water into the ground.
answered May 20 at 6:34
h22h22
2992 silver badges10 bronze badges
$endgroup$
When there is no professional setup at hand and I still need to touch the circuit boards with my hands, I simply wash my hands in the bathroom before doing so. I believe the static is discharged through the running water into the ground.
answered May 20 at 6:34
h22h22
2992 silver badges10 bronze badges
answered May 20 at 6:34
h22h22
2992 silver badges10 bronze badges
answered May 20 at 6:34
h22h22
2992 silver badges10 bronze badges
answered May 20 at 6:34
h22h22
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This is a fascinating discussion. I was always told that you can't earth static electricity charge you can only reduce its potential. This is why back in the 1960s on British roads you often saw people driving a car with a chain dangling from the rear bumper and usually it was dragging on the ground as the car went along which did nothing to reduce static. It was believed by many that removing static reduced car-sickness for affected passengers. But the proper way to deploy the chain was so that it almost reached the ground. My father used to hold the ignition key between thumb and first finger as he slid out of the seat (static generated by the seat of his pants) and he'd touch the key on the door frame as he stood up. This discharged the static from his body and it dissipated through the bodywork. A spark would visibly jump off the key as he touched the body. He also switched to leather soled shoes which helped compared to Neoprene soles.
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3
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Welcome to EE.SE, Larry. Please note that this isn't a forum of the type you may be used to and answers have to be actual answers and not a "discussion" as you seem to think. I think your answer has enough relevant material to stand as an answer. Please take the Tour to learn how the site works. Note that answers float up and down with voting or user sorting preference. One of my work colleagues solved the car static problem by letting his wife get out first!
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– Transistor
May 18 at 10:29
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This is a fascinating discussion. I was always told that you can't earth static electricity charge you can only reduce its potential. This is why back in the 1960s on British roads you often saw people driving a car with a chain dangling from the rear bumper and usually it was dragging on the ground as the car went along which did nothing to reduce static. It was believed by many that removing static reduced car-sickness for affected passengers. But the proper way to deploy the chain was so that it almost reached the ground. My father used to hold the ignition key between thumb and first finger as he slid out of the seat (static generated by the seat of his pants) and he'd touch the key on the door frame as he stood up. This discharged the static from his body and it dissipated through the bodywork. A spark would visibly jump off the key as he touched the body. He also switched to leather soled shoes which helped compared to Neoprene soles.
$endgroup$
3
$begingroup$
Welcome to EE.SE, Larry. Please note that this isn't a forum of the type you may be used to and answers have to be actual answers and not a "discussion" as you seem to think. I think your answer has enough relevant material to stand as an answer. Please take the Tour to learn how the site works. Note that answers float up and down with voting or user sorting preference. One of my work colleagues solved the car static problem by letting his wife get out first!
$endgroup$
– Transistor
May 18 at 10:29
add a comment
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This is a fascinating discussion. I was always told that you can't earth static electricity charge you can only reduce its potential. This is why back in the 1960s on British roads you often saw people driving a car with a chain dangling from the rear bumper and usually it was dragging on the ground as the car went along which did nothing to reduce static. It was believed by many that removing static reduced car-sickness for affected passengers. But the proper way to deploy the chain was so that it almost reached the ground. My father used to hold the ignition key between thumb and first finger as he slid out of the seat (static generated by the seat of his pants) and he'd touch the key on the door frame as he stood up. This discharged the static from his body and it dissipated through the bodywork. A spark would visibly jump off the key as he touched the body. He also switched to leather soled shoes which helped compared to Neoprene soles.
$endgroup$
This is a fascinating discussion. I was always told that you can't earth static electricity charge you can only reduce its potential. This is why back in the 1960s on British roads you often saw people driving a car with a chain dangling from the rear bumper and usually it was dragging on the ground as the car went along which did nothing to reduce static. It was believed by many that removing static reduced car-sickness for affected passengers. But the proper way to deploy the chain was so that it almost reached the ground. My father used to hold the ignition key between thumb and first finger as he slid out of the seat (static generated by the seat of his pants) and he'd touch the key on the door frame as he stood up. This discharged the static from his body and it dissipated through the bodywork. A spark would visibly jump off the key as he touched the body. He also switched to leather soled shoes which helped compared to Neoprene soles.
answered May 18 at 9:54
user222276user222276
3
$begingroup$
Welcome to EE.SE, Larry. Please note that this isn't a forum of the type you may be used to and answers have to be actual answers and not a "discussion" as you seem to think. I think your answer has enough relevant material to stand as an answer. Please take the Tour to learn how the site works. Note that answers float up and down with voting or user sorting preference. One of my work colleagues solved the car static problem by letting his wife get out first!
$endgroup$
– Transistor
May 18 at 10:29
add a comment
|
3
$begingroup$
Welcome to EE.SE, Larry. Please note that this isn't a forum of the type you may be used to and answers have to be actual answers and not a "discussion" as you seem to think. I think your answer has enough relevant material to stand as an answer. Please take the Tour to learn how the site works. Note that answers float up and down with voting or user sorting preference. One of my work colleagues solved the car static problem by letting his wife get out first!
$endgroup$
– Transistor
May 18 at 10:29
3
3
$begingroup$
Welcome to EE.SE, Larry. Please note that this isn't a forum of the type you may be used to and answers have to be actual answers and not a "discussion" as you seem to think. I think your answer has enough relevant material to stand as an answer. Please take the Tour to learn how the site works. Note that answers float up and down with voting or user sorting preference. One of my work colleagues solved the car static problem by letting his wife get out first!
$endgroup$
– Transistor
May 18 at 10:29
$begingroup$
Welcome to EE.SE, Larry. Please note that this isn't a forum of the type you may be used to and answers have to be actual answers and not a "discussion" as you seem to think. I think your answer has enough relevant material to stand as an answer. Please take the Tour to learn how the site works. Note that answers float up and down with voting or user sorting preference. One of my work colleagues solved the car static problem by letting his wife get out first!
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– Transistor
May 18 at 10:29
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Take a habit of wearing ESD shoes at work. These slowly drain the charge as you walk, and if you're picking up the charge from the carpet, they prevent it from accumulating in the first place.
The main advantage is that once you put ESD shoes on, there's no protocol to follow. You can't forget to put a strip back on when you return to your desk, touch a metal object etc. You're really protected 100% of the time while walking freely around the office.
answered May 20 at 10:52
Dmitry GrigoryevDmitry Grigoryev
19.8k2 gold badges31 silver badges79 bronze badges
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Take a habit of wearing ESD shoes at work. These slowly drain the charge as you walk, and if you're picking up the charge from the carpet, they prevent it from accumulating in the first place.
The main advantage is that once you put ESD shoes on, there's no protocol to follow. You can't forget to put a strip back on when you return to your desk, touch a metal object etc. You're really protected 100% of the time while walking freely around the office.
answered May 20 at 10:52
Dmitry GrigoryevDmitry Grigoryev
19.8k2 gold badges31 silver badges79 bronze badges
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add a comment
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Take a habit of wearing ESD shoes at work. These slowly drain the charge as you walk, and if you're picking up the charge from the carpet, they prevent it from accumulating in the first place.
The main advantage is that once you put ESD shoes on, there's no protocol to follow. You can't forget to put a strip back on when you return to your desk, touch a metal object etc. You're really protected 100% of the time while walking freely around the office.
answered May 20 at 10:52
Dmitry GrigoryevDmitry Grigoryev
19.8k2 gold badges31 silver badges79 bronze badges
$endgroup$
Take a habit of wearing ESD shoes at work. These slowly drain the charge as you walk, and if you're picking up the charge from the carpet, they prevent it from accumulating in the first place.
The main advantage is that once you put ESD shoes on, there's no protocol to follow. You can't forget to put a strip back on when you return to your desk, touch a metal object etc. You're really protected 100% of the time while walking freely around the office.
answered May 20 at 10:52
Dmitry GrigoryevDmitry Grigoryev
19.8k2 gold badges31 silver badges79 bronze badges
answered May 20 at 10:52
Dmitry GrigoryevDmitry Grigoryev
19.8k2 gold badges31 silver badges79 bronze badges
answered May 20 at 10:52
Dmitry GrigoryevDmitry Grigoryev
19.8k2 gold badges31 silver badges79 bronze badges
answered May 20 at 10:52
Dmitry GrigoryevDmitry Grigoryev
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Old school solution is to touch the grounded chassis first with one hand while using the other to handle sensitive devices. Never had a failure doing this.
answered May 20 at 12:33
SamRSamR
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Old school solution is to touch the grounded chassis first with one hand while using the other to handle sensitive devices. Never had a failure doing this.
answered May 20 at 12:33
SamRSamR
658 bronze badges
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Old school solution is to touch the grounded chassis first with one hand while using the other to handle sensitive devices. Never had a failure doing this.
answered May 20 at 12:33
SamRSamR
658 bronze badges
$endgroup$
Old school solution is to touch the grounded chassis first with one hand while using the other to handle sensitive devices. Never had a failure doing this.
answered May 20 at 12:33
SamRSamR
658 bronze badges
answered May 20 at 12:33
SamRSamR
658 bronze badges
answered May 20 at 12:33
SamRSamR
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answered May 20 at 12:33
SamRSamR
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protected by W5VO♦ May 20 at 14:56
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?
18
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is there a reason you can't use a standard ESD wrist strap?
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– Puffafish
May 17 at 8:26
4
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When I return to my desk, I ground myself on a conductor. There are an order of magnitude fewer nerve cells in the outside of a knuckle than the pad of a fingertip, so I lightly punch it, rather than use my finger.
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– Neil_UK
May 17 at 12:44
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The old school, though not entirely professional way, is to grab a radiator before touching electronics with your hands. (That is, the stuff that heats your building, not stuff that gives out radio waves. Silly English language.)
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– Lundin
May 17 at 13:48
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Dude, I had exactly this problem. The static was so significant, on one occasion I touched the backplate of a network card which instantly threw a network error on the computer's screen. The NIC refused to work again until the PC was rebooted. Vending machines would reboot themselves when I touched the coin slot. Turns out it was my shoes on the cheap synthetic carpet tiles at work; every time I walked to the kitchen I was "charging up" owing to friction. Google for "Antistatic Heel Grounder" or "ESD footwear".
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– Rab
May 17 at 15:44
3
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Some chairs have synthetic fabrics that build up a lot of charge when you sit down in / get up from them.
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– W5VO♦
May 17 at 16:16