In article , "Ron G"
wrote:

One of the computers in my office had an integrated sound card, and
periodically, it would start a variable rate ch ch ch ticking sound- for
a couple seconds, and then it would go away - happened once or twice
most days. That building was practically a Faraday cage - so I'm sure
it was internal to the computer.

Ahhhh yes, how well I remember building Faraday cages when I worked in a
Research Lab. :-)

I would orient it on a wooden step-ladder, midway between floor and ceiling,
then turn and tilt until I could neutralize out the electrostatic field of
the earth.

Then, the small electronic object I had inside the Cage, could be tested
without an interfering quiescent electrostatic field.

I don't understand the orientation part of the post. A Faraday cage is
just an electrostatic shield and has nothing to do with the earth¹s
magnetic field.

Your cage must have been more than a Faraday cage.

--
Telamon
Ventura, California

It was indeed for the Earth's electrostatic field.
It has a "direction", and also, depending on what metallic objects are
nearby (5 or 10 feet away), that distort the direction of the field.
We designed a standard Farady cage (an Eng Research group of about 50 Phd's,
etc) with multiple coils epoxied on a "bakelite type" box. Then we sliced
the wires along ones side so there were no continuous loops, and ran a
ground on all the "broken" coil loops on the opposite side.

Possibly we were nulling out other electrostatic sources at the same time,
but it was designed to null out the Earth's electrostatic (not maagnetic)
field.

I did very "low level micro" type measurements inside it for 10 years.
Without the shield, it would have been impossible, the Earth's electrostatic
field was too great.

This was in a pure research setting, really eye-opener stuff. I loved that
type of research totally.

Best---
Ron



Telamon wrote in message
...
In article , "Ron G"
wrote:

One of the computers in my office had an integrated sound card, and
periodically, it would start a variable rate ch ch ch ticking sound-
for
a couple seconds, and then it would go away - happened once or twice
most days. That building was practically a Faraday cage - so I'm sure
it was internal to the computer.

Ahhhh yes, how well I remember building Faraday cages when I worked in a
Research Lab. :-)

I would orient it on a wooden step-ladder, midway between floor and
ceiling,
then turn and tilt until I could neutralize out the electrostatic field
of
the earth.

Then, the small electronic object I had inside the Cage, could be tested
without an interfering quiescent electrostatic field.

I don't understand the orientation part of the post. A Faraday cage is
just an electrostatic shield and has nothing to do with the earth¹s
magnetic field.

Your cage must have been more than a Faraday cage.

--
Telamon
Ventura, California


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.593 / Virus Database: 376 - Release Date: 2/20/04

In article , "Ron G"
wrote:

It was indeed for the Earth's electrostatic field. It has a
"direction", and also, depending on what metallic objects are nearby
(5 or 10 feet away), that distort the direction of the field. We
designed a standard Farady cage (an Eng Research group of about 50
Phd's, etc) with multiple coils epoxied on a "bakelite type" box.
Then we sliced the wires along ones side so there were no continuous
loops, and ran a ground on all the "broken" coil loops on the
opposite side.

Possibly we were nulling out other electrostatic sources at the same
time, but it was designed to null out the Earth's electrostatic (not
maagnetic) field.

I did very "low level micro" type measurements inside it for 10
years. Without the shield, it would have been impossible, the Earth's
electrostatic field was too great.

This was in a pure research setting, really eye-opener stuff. I loved
that type of research totally.

Well that is interesting. I suppose the stream of charged particles
from the Sun that make it to earth along with any intergalactic
currents charge the earth to some potential.

Was there an average background level? I suppose the level moves around
due to Sun activity.


Telamon wrote in message
...
In article , "Ron G"
wrote:

One of the computers in my office had an integrated sound card,
and periodically, it would start a variable rate ch ch ch
ticking sound-
for
a couple seconds, and then it would go away - happened once or
twice most days. That building was practically a Faraday cage
- so I'm sure it was internal to the computer.

Ahhhh yes, how well I remember building Faraday cages when I
worked in a Research Lab. :-)

I would orient it on a wooden step-ladder, midway between floor
and ceiling, then turn and tilt until I could neutralize out the
electrostatic field of the earth.

Then, the small electronic object I had inside the Cage, could be
tested without an interfering quiescent electrostatic field.

I don't understand the orientation part of the post. A Faraday cage
is just an electrostatic shield and has nothing to do with the
earth¹s magnetic field.

Your cage must have been more than a Faraday cage.

-- Telamon Ventura, California


--- Outgoing mail is certified Virus Free. Checked by AVG anti-virus
system (http://www.grisoft.com). Version: 6.0.593 / Virus Database:
376 - Release Date: 2/20/04

--
Telamon
Ventura, California