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ZAP! Another ESD Casualty

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profgroove
User Rank
Iron
ESD
profgroove   6/6/2013 2:13:13 PM
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We had an ESD problem with Si wafer fork robot.  Not only did the computer occasionally re-boot, but spark damage occurred on wafers withdrawn and/or inserted into their plastic cassettes.  The solution:  Isolate the fork and connect to ground through a giga Ohm resistor.

g-whiz
User Rank
Gold
Painful excersize
g-whiz   6/6/2013 3:34:39 PM
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I had my earphones plugged into a (grounded) audio distribution system mounted on the treadmills at the local gym (so we could select and hear television audio from various overhead monitors). I was electrically isolated, in intimate contact with a hard rubber belt, moving and rubbing against another surface. I felt a periodic sharp pain in my head while walking. As a static charge built up on me, the thousands of volts eventually had enough pressure to jump the gap between the grounded earphones and my ear canal. I didn't hear it beacuse the audio was louder, but I sure felt it. It took me a few moments to analyse what was going on. On my next visit, I grounded myself to the treadmill handrail using a standard ESD wrist strap/wire. Problem went away. No wonder noboby was listening to the TVs at the treadmill station. I told manangement and they bought a bag of wired wrist straps for their clients to use.

etmax
User Rank
Gold
Re: Modern ESD Testing
etmax   6/6/2013 10:16:12 PM
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Hi Jim,


I read William K's reply and his point really suggests that as consumers we should only buy CE marked products which actually MUST go through this testing to be allowed to apply the logo. That way the shonky operators cease to sell products and we all benefit. The purpose of the CE mark was to lift product quality to a minimum standard deemed necessary for the application. In the EU it's enforced and placing a CE mark without complying results in fines and worse a need to remove the mark. Designing for ESD places some real challenges on the designer adding great skills and improving employment prospects (at least where it's mandatory :-) ).

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.

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.

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: 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....

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

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.

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.

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