Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 2 / 9   >   >>
zeeglen
User Rank
Blogger
Re: Laptop grounded?
zeeglen   8/21/2014 5:27:10 PM
NO RATINGS
@JLBrake you can use equipotential bonding.

When breadboarding it can help to do all your work on a new cookie baking sheet.  The raised edges keep small parts contained within your work area, and since your wrists can rest on the raised edges everything is at the same potential as the worker.  Just be sure to touch the cookie sheet first when starting a session, and maintain contact with the cookie sheet.

Max The Magnificent
User Rank
Blogger
Re: Maybe...
Max The Magnificent   8/21/2014 5:15:56 PM
NO RATINGS
@zeeglen: "It's not very hot."  Then a few seconds later "But it sure is getting hot now!"

I can so imagine this scene...

Max The Magnificent
User Rank
Blogger
Re: Laptop grounded?
Max The Magnificent   8/21/2014 5:14:31 PM
NO RATINGS
@JLBrake: Based on this post we are going to make some samples of a USB to banana jack adaptor to see how this would work.  The adaptor will allow a standard wrist strap to be connected to the USB.

You might want to make it a double-banana jack -- that way someone could connect both their wriststrap and their anti-static mat to the same USB plug

Max The Magnificent
User Rank
Blogger
Re: Laptop grounded?
Max The Magnificent   8/21/2014 5:12:58 PM
NO RATINGS
@JLBrake: ...If grounding to the electrical ground is not possible, you can use equipotential bonding....

WONDERFUL point -- I'm kicking myself for not thinking about this.

zeeglen
User Rank
Blogger
Re: Maybe...
zeeglen   8/21/2014 4:34:29 PM
@studleylee I still keep a A/D converter I bought from Analog Devices that cost me $100 in 1984. I zapped it.

An engineering lab actually had a carpeted floor.  Was supposed to be anti-ESD carpet, but the installer got it wrong, and it had to be sprayed weekly with some kind of chemical.  Back then we did not have heel straps or wrist straps.

Anyway, on a cold dry winter day in the Great White North, a colleague had just installed the 1st of 10 samples of his brand new ASIC into the socket.  It was in a ceramic package with a metal top. We fired the board up, then we wondered how warm the ASIC was running.  My friend reached out to feel it - I said "Static!" but it was too late.  We could hear the 'snap' of a strong ESD discharge.

He said "It's not very hot."  Then a few seconds later "But it sure is getting hot now!"

One down, nine to go.

studleylee
User Rank
Manager
Re: Maybe...
studleylee   8/21/2014 4:13:53 PM
NO RATINGS
You just put it into a known state.....

I still keep a A/D converter I bought from Analog Devices that cost me $100 in 1984. I zapped it. Now it's a reminder. -Lee

JLBrake
User Rank
Rookie
Re: Laptop grounded?
JLBrake   8/21/2014 3:44:31 PM
NO RATINGS
There's lots of stuff going here, but let me try to clarify some things.

 When working on the something like a laptop, there are really two options of grounding for ESD purposes.  

1.  Ground all conductors and dissipative materials (people, product, worksurface, etc) through an electrical ground (third wire).  This is the preferred method for electronics manufactures because the electrical ground is where other equipment (soldering iron, scopes, etc) used in the production environment if grounded, but not always available in "field" applications. 

2. If grounding to the electrical ground is not possible, you can use equipotential bonding. Equipotential bonding connects all conductors and dissipative materials in the environment together.  If you are working on something such as a laptop, you would use an alligator clip to connect the wrist strap to the housing of the laptop. 

Both methods essentially do the same thing in creating an equipotential balance between all items and personnel.  ESD events can only occur when there is a difference in the potential. Note that only conductors and dissipative materials can be grounded, insulators require ionization to control ESD. 

Based on this post we are going to make some samples of a USB to banana jack adaptor to see how this would work.  The adaptor will allow a standard wrist strap to be connected to the USB.

Max The Magnificent
User Rank
Blogger
Re: Maybe...
Max The Magnificent   8/21/2014 9:58:32 AM
NO RATINGS
@MeasurementBlues: A man without two cities.

But you'll always have the memory of bagels to see you through the hard times...

William.Biehler_0623
User Rank
Rookie
Re: Laptop grounded?
William.Biehler_0623   8/20/2014 7:22:41 PM
NO RATINGS
There are several kits for grounding to an outlet strip. One can be found at the site below.

http://www.stanleysupplyservices.com/static-solutions-sp-101-receptacle-ground-tester-with-wrist-strap-plug/p/479-077

And there are portable mats etc. at the site.

http://www.stanleysupplyservices.com/search.aspx?f=1%3a983


I have some of these in my field service kit along with travel adapters for the different power connectors in countries I travel to.

There are probably several other ways to get ESD safety, but the outlet adapter seems to work for me.

Measurement.Blues
User Rank
CEO
Re: Maybe...
Measurement.Blues   8/20/2014 8:32:53 AM
NO RATINGS
All this talk of accents.

I was born in Brooklyn but moved to New England (north of Boston) at age 13. Some people in New England say I still sounds like a NYer, but those in NY say I sound like I'm from New England.

A man without two cities.

<<   <   Page 2 / 9   >   >>


EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Steve Wozniak Reacts to Latest iPhone
Max Maxfield
6 comments
Funnily enough, just a few days ago as I pen these words, I was chatting with my wife (Gina the Gorgeous) when she informed me that -- as a kid -- she had never played at making a ...

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
20 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
15 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
46 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)