[ausev] Riding close to 96v EMF vs 120v EMF

[jefoy at mindspring.com]

Actually quite different.. 

The CRT has a DC potential close to 24kV. At this voltage X-rays are produced but are shielded by leaded glass used to cover the CRT screen. Internal to the CRT there is a 20 kHz switching circuit producing a fairly intense RF field internal to the monitor itself but due to stringent goverment regulations, the entire monitor is covered in a metal shield to prevent electrical radiation. Note that this shielding is specific to electric fields, not magnetic. If you turn the monitor 90 degrees while it is on you will notice a dramatic shift in the overall color of the screen. This change is due to the magnetic field of the earth influencing the trajectory of the electron beam in the CRT. During turn on  you might notice the screen emitting a low hum for a second or two and see the screen wobble and shift colors rapidly. This affect is caused by a coil of wire energized by the 60 Hz line that performs the same function as a bulk tape eraser. It produces a strong alternating magnetic field to cancel the slight polarizing affect of the earth's magnetic field..

Electric and magnetic fields produced by an EV will be stonger but much lower in frequency. Some research suggests a link between electric fields and brain tumors but the evidence so far is not compelling.

Jack Foy

-----Original Message-----
>From: jtp <jtp at onr.com>
>Sent: Nov 7, 2006 7:34 PM
>To: eeyore at phototropia.org, AustinEV News Announcements and General Discussion <ausev at austinev.org>
>Subject: Re: [ausev] Riding close to 96v EMF vs 120v EMF
>
>Chris,
> Then probably not very different than the CRT in front of me right now. 
>Dan. 
>
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