EEVblog #21 - The Unusual Oscilloscope Phenomenon - Part 3

Part 1: http://www.youtube.com/watch?v=sUG_sjS67K4
Part 2: http://www.youtube.com/watch?v=weJ4JdFat8o

Dave dons the lab coat for yet another installment of the Unusual Oscilloscope Phenomenon

Category:

Science & Technology

Tags:

• oscilloscope
• static
• tektronix
• agilent
• rigol
• probe
• ground
• impulse
• unusual
• measurement
• measure

[ocgreg1]

Have you tried the experiment using a stool or chair without a spring suspension system?

[EEVblog]

Yes, as I've said, it has nothing to do with the spring suspension system. It is static electricity generated by the materials.

[EEVblog]

Nothing to do with vibration or shock. I can get the exact same effect by rubbing my jumper against the chair material. So static generation is the source.

[pomonabill220]

I don't understand why people don't fully understand grounding / static discharge. I was ESD investigator at Hughes Aircraft several years ago and using an ESD meter, we regularly measured 30,000 volts (and more) from just standing up from a lab chair even using static mats, wrist straps. ESD IS A REAL PROBLEM AND CAN "KILL" ELECTRONICS!!!! This demonstration proves it!!!

[averagemale2000]

Did you try to use a chair that doesn't make any noise? Or try yelling at the probe.It maybe working like a mic. Crowe probe? Was it named after Russeel Crowe?

[kurtnelle]

Perhaps its EMI from the nerves in your spinal cord?

[jaleits]

This phenomena (darn iPad touchpad!). The static charge induced in the chairs rod makes a nice radiator :-)

[jaleits]

Thisnp

[jaleits]

Seems Dave says that it ain't due to mechanical vibration, as he can rub his jumper against the chair and get the same impulse. A rapidly expanding or changing magnetic field (an electric as well) can also cause this pe

[jaleits]

And have seen this phenomena first hand with RF spectrum analyzers

[jaleits]

The issue is most likely due to the phenomena called Microphonics, whereby certain electronic components convert mechanical vibrations into electrical impulses or noise. I am an engineer in the test and measurement industry and g

[Kilohercas]

i was unable to do that, something wrong with your chair :)

i have insulated channels 200MHz 2GSps Tektronix TPS2024 and no trigger, even at 5mV/div and 2.5ns/div :|

[render8]

I believe, wearing a viking style aluminum foil helmet (diode fitted between horns) while licking a 9 volt battery, and wearing a full body latex jumpsuit will eliminate this problem...provocative, possibly to some, but it will work.