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ZAP! Another ESD Casualty

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tekochip
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Platinum
Re: One static charge after another
tekochip   8/8/2014 7:16:28 PM
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All true, you have to ground the aircraft before fueling.  Imagine a spark like that being drawn from the fuel hose into an empty tank.

J. Williams
User Rank
Platinum
Re: One static charge after another
J. Williams   8/8/2014 6:16:20 PM
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That was most likely due to the static charge built up on the skin of your aircraft just from airflow.  Rotary wing aircraft are particularly susceptible to this issue.  Don't they always have you ground the skin before you put fuel in your plane?  I'm not a pilot, but I have spent more than a few hours coming and going off of vaious flight lines, usually hauling a ruck. 

tekochip
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Platinum
Re: One static charge after another
tekochip   8/8/2014 4:29:45 PM
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One night after a flight I was pushing the aircraft back and when the towbar got close to the nose gear I drew a good 1" spark and a dandy SNAP.


rhayashi
User Rank
Iron
ZAPPED!
rhayashi   8/7/2014 7:29:15 PM
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I had a Medical instrument the was reported to reboot in a Swedish operating room that had very bad static charge issues. We could not duplicate the problem with a local unit, so the aquired the Swedish unit. I could not get it to fail with my sparky stick. The only clue was it happened when it was set for full volume. The volume control was for a anoying vacume level warbler sound. (so I always set it to minimun) I finnaly tried it at full volume. As it turns out the volume control pot set at maximum allowed a spark into the A/D which latched up the CPU, While a low volume setting sent the spark into ground.

dbues
User Rank
Gold
Re: ESD discharge
dbues   7/1/2013 8:50:11 AM
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Frank,

Good idea to pull the batteries.  Didn't work, though.  Not sure what the right way would be to discharge the alleged capacitor.  I might try to remove the batteries and then short the DC + and - together.  Otherwise, I'll have to take a look inside.

Dwight

J. Williams
User Rank
Platinum
Re: One static charge after another
J. Williams   6/17/2013 5:34:42 PM
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Yes, the carts at my local Sam's Club replicate four little Van De Graaf generators with the wire basket and frame working as a top load.  The whack I get from the cart is quite startling.

Cadman-LT
User Rank
Platinum
Everyone
Cadman-LT   6/17/2013 5:03:35 AM
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I would have to guess that almost everyone has had this happen to them at some point in time. I sure have.

Larry M
User Rank
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.

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