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Larry M
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Platinum
Re: Painful excersize
Larry M   6/13/2013 8:58:42 AM
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g-whiz wrote: " I was electrically isolated, in intimate contact with a hard rubber belt, moving and rubbing against another surface."

The other name for this particular apparatus is "Van de Graff generator." They can generate up to 5 million volts. See the Wikipedia article for more details.

 

 

Rob Spiegel
User Rank
Blogger
Re: One static charge after another
Rob Spiegel   6/11/2013 9:46:31 PM
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Thanks TJ. I look forward to seeing them.

econobiker
User Rank
Iron
Re: One static charge after another
econobiker   6/10/2013 2:16:35 PM
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nichollr wrote:

"I've noticed at our local Walmart that as I push some of the carts, I get a static discharge through my hands.  It's really uncomfortable.  Have other's noticed this same problem?"

Often you will see some versions of  shopping carts with a discharge strap or small chain hanging down rubbing the ground.  This also seems to be a greater problem with the newer plastic carts than the older metal carts... There has been alot of info about this problem with a specific retailer which you can find by searching: Wal-mart shopping cart static electricity shock.

John E
User Rank
Silver
Re: One static charge after another
John E   6/7/2013 6:25:48 PM
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I once worked for a contract ICT test house developing test programs and fixtures.  Our test head (HP3065) and debug bench was in a "static controled" room with a disapative carpet.  One day durring the winter, I walked accros that rug, reached down into the empty patch bay of the test head and drew a 1" arc to one of the test card connections; it hurt like heck and I jumped back.  I immediatley grabed the diagnostics fixture, and found that we had a dead analog card.  It took two day of down time for HP to find the problem and get us a replacement card.  So much for the anti static carpet.  We got a lot more serious about wrist staps after we learned that we could not rely on the carpet any more.

Rob Spiegel
User Rank
Blogger
Re: One static charge after another
Rob Spiegel   6/7/2013 5:56:12 PM
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Hey, 3Drob,

I'd like to use this story as a Made by Monkeys blog. 

You can send it along to rob.spiegel@ubm.com

Thanks.

Rob Spiegel
User Rank
Blogger
Re: Painful excersize
Rob Spiegel   6/7/2013 5:52:59 PM
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Hey, g-wiz, this would make a good Sherlock Ohms posting. Could you send it along with a bit more detail -- to fill out the length -- and include a short two- to four-sentence bio?

You can send it to rob.spiegel@ubm.com

dbues
User Rank
Gold
Re: I guess not every company focuses on ESD
dbues   6/7/2013 6:45:16 AM
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JimT, thanks for the feedback!!!  Comes from having an English teacher for a Mom....

dbues
User Rank
Gold
Re: One static charge after another
dbues   6/7/2013 6:43:58 AM
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3drob, I know what you mean.  We had a guy years back that used to flick his cigarette ashes into our chassis.  Drove QA nuts!!!  He's the same guy that designed everything with discrete J-K flip flops.

 

Everybody assumed he was a genius because all his designs worked, but nobody understood them.  Luckily for me, he left before I had to debug anything he designed.

dbues
User Rank
Gold
Re: ESD discharge
dbues   6/7/2013 6:40:30 AM
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Thanks for the tip, Frank.  I'm trying it now.

Ralphy Boy
User Rank
Platinum
Re: One static charge after another
Ralphy Boy   6/6/2013 10:55:01 PM
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Yeah 3drob... We get that too sometimes. I've been told by one EE that he's never zapped a board... 'Yet' is what I replied.

We have below 1% humidity in the dryrooms and an over active air exchange in one of those creates a bit of a breeze too. We do a good job of maintaining boot straps, wrist straps, ESD Lab coats as SOP in those... and we still get the occasional fire, so far though those always seem to be non-static events. Friction; go figure.

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