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Check if your IKEA chair is compatible with your screen

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Re: Check if your IKEA chair is compatible with your screen

#151

Post by danShumway »

blueflow wrote: post #14

I once had the problem that running make with too many parallel jobs (-j) would change my keyboard layout. The machine was some laptop mainboard glued to the backside of my monitor, and the USB socket came out at the top of the mainboard. On its way down, the USB cable for the keyboard passed across the whole mainboard. On high load, the mainboard created enough interference to cause the connection to reset, re-hotpl…

I've heard a number of weird "remember that computers are physical devices" debugging stories now, but this might be the best one :)

It's such a Rube Goldberg kind of error, I love it.

Re: Check if your IKEA chair is compatible with your screen

#152

Post by Gare »

eastbound wrote: post #129
m463 wrote: post #121

Earlier quoted context omitted.

Reminds me of woz's apple video on ESD: https://youtu.be/hLOQ7zOWGAA Personally I remember having a pickup truck with a velour seat. During winter I would slide off the seat at a gas station and the first thing I would tough would be the gas pump handle - ZAAAP. Not what you want at a gas station!

That’s why in Europe the gas nozzle doesn’t have the little lock - It requires that you keep pressing it. So that you avoid going back to the car, charging static, coming back to the nozzle and having a spark.

I've never seen nozzle without a lock in Europe (Croatia and countries close to it).

Re: Check if your IKEA chair is compatible with your screen

#155

Post by qwertox »

I have the same issue with another brand (Topstar Open Point SY Deluxe), but it usually only happens when I wear some sandals with a specific sole.

I have a power outlet glued to the desk and since it's a German version the grounding contacts are well exposed, so that, when I wear those sandals, I get up from the chair while holding the grounding contacts.

It doesn't work all the time, specially when I'm also wearing a fleece jacket, because the jacket doesn't discharge over the body. But it helps a bit.

Re: Check if your IKEA chair is compatible with your screen

#156

Post by spacemanspiff01 »

eastbound wrote: post #129
m463 wrote: post #121

Earlier quoted context omitted.

Reminds me of woz's apple video on ESD: https://youtu.be/hLOQ7zOWGAA Personally I remember having a pickup truck with a velour seat. During winter I would slide off the seat at a gas station and the first thing I would tough would be the gas pump handle - ZAAAP. Not what you want at a gas station!

That’s why in Europe the gas nozzle doesn’t have the little lock - It requires that you keep pressing it. So that you avoid going back to the car, charging static, coming back to the nozzle and having a spark.

Parts of US have this, (where it snows and is dry enough in the winter to be an issue.)

Re: Check if your IKEA chair is compatible with your screen

#157

Post by iforgotpassword »

eitland wrote: post #128
tinglymintyfrsh wrote: post #106

Earlier quoted context omitted.

My dad's car had velour interior. Anytime the humidity was below 50%, expect the car to zap you and to be zapped touching door handles. I assume there are/were numerous gas station fuel fires from cars with velour upholstery.

One stupid little thing I realized after having sometimes been consistently zapped by mybcar door and other times not getting zapped in the same weather and humidity: If I open the door and grasp for the (metal) edge of it before I start sliding out of my seat I will be grounded and consequently not build up charge as I leave the seat.

We had some carpet at my old workplace that would always charge you up and get you zapped. Whenever you touched anything metal. So the old and wise folks there immediately told you to grab your key when you get up and then use it to touch something metal, so the spark is between your key and the metal object and you don't feel anything.

Re: Check if your IKEA chair is compatible with your screen

#158

Post by mlyle »

varjag wrote: post #115
mlyle wrote: post #30

Earlier quoted context omitted.

Cars are a terrible ESD and EMC environment and safety critical at the same time. Computer equipment usually does pretty well, especially after installation (when there's good ground path everywhere and it's in a chassis). Between ferrite beads and TVS, there's a pretty good amount of protection, and I've seen pretty few ESD anomalies-- a reset or two when touching connectors long ago is about the extent of it. RFI a…

A 100W transmitter is a crapload of energy, way beyond most consumer and industrial EM immunity requirements.

Yup, though I was also nowhere close. It may have been conducted EMI.

Re: Check if your IKEA chair is compatible with your screen

#159

Post by dexzod »

geff82 wrote: post #133

That might explain the thing I sometimes experience with my screen. I also have an Ikea Markus. Sometimes, when I get up, the screen goes off. I thought there is some kind of weird sensor in the screen.

I would consider this as a privacy feature. Ikea should mention this in their marketing material
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