Comment by scrumper
6 years ago
How does sitting on a gas lift chair generate an EMI spike (per the article)? The metal piston sliding an inch or two inside the cylinder collar is enough? Or is the hydraulic fluid itself metallic?
6 years ago
How does sitting on a gas lift chair generate an EMI spike (per the article)? The metal piston sliding an inch or two inside the cylinder collar is enough? Or is the hydraulic fluid itself metallic?
The article cites/links-to a whitepaper from 1993 on the topic of EMI producing furniture. I haven't actually read the whitepaper myself, but there might be more information in there....
The paper is mostly about measuring the magnitude of the EMI. They observe that dry air and metal legs are required, but not much more than that - I don’t think they mention gas lifts at all. The last few paragraphs have some guesses but they basically said that finding the cause is for future work.
It said a cushion, so maybe it's a static charge in combination with the legs as an antenna?
I remember during cold winter weather, with single digit humidity, sliding off a fabric car seat would cause you to get shocked when you touched something.
ah thanks, had missed that.