question: sensitive device to measure very small changes in
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question: sensitive device to measure very small changes in

 
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Brother Numzi
Guest
Posted: Sun Jul 24, 2005 12:35 am    Post subject: question: sensitive device to measure very small changes in Reply with quote
Hello

I am looking for some equipment that is _very_ sensitive and is capable of
measuring _very_ small changes in electrical fields and magnetic fields? The
device must be able to record the measurements real time.

What should I be looking for?

Thanks :o)

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Watson A.Name - \"Watt Su
Guest
Posted: Sun Jul 24, 2005 12:35 am    Post subject: Re: question: sensitive device to measure very small changes Reply with quote
"Brother Numzi" <Numzi@hutmeil.comeon> wrote in message
news:42e2bf44$0$78285$157c6196@dreader1.cybercity.dk...
Quote:
Hello

I am looking for some equipment that is _very_ sensitive and is
capable of
measuring _very_ small changes in electrical fields and magnetic
fields? The
device must be able to record the measurements real time.

What should I be looking for?

Thanks :o)

Well, if you don't know which field you want, then how are we supposed
to know? Try a ferrite rod with several thousand turns of fine wire on
it, and plug it into the mic input of an audio amp.
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CJT
Guest
Posted: Sun Jul 24, 2005 5:27 am    Post subject: Re: question: sensitive device to measure very small changes Reply with quote
Brother Numzi wrote:
Quote:
Hello

I am looking for some equipment that is _very_ sensitive and is capable of
measuring _very_ small changes in electrical fields and magnetic fields? The
device must be able to record the measurements real time.

What should I be looking for?

Thanks :o)



For a moment there, I thought you were looking for a mirror

galvanometer, but maybe not, since you don't seem to be interested
in currents as much as fields.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.

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Rich Webb
Guest
Posted: Sun Jul 24, 2005 5:44 am    Post subject: Re: question: sensitive device to measure very small changes Reply with quote
On Sun, 24 Jul 2005 00:06:07 +0200, "Brother Numzi"
<Numzi@hutmeil.comeon> wrote:

Quote:
Hello

I am looking for some equipment that is _very_ sensitive and is capable of
measuring _very_ small changes in electrical fields and magnetic fields? The
device must be able to record the measurements real time.

What should I be looking for?

Small changes in large fields? Small changes in small fields? Both
electrical and magnetic fields, simultaneously, or would one or the
other be sufficient? What changes; intensity, polarization, direction,
or ...? Record to what precision? Record with what accuracy? Calibrated
or just "as built?" Is it sufficient if the measurements are time
stamped and spooled to permanent media or must they be streamed? Should
"real time" be synced to the UTC(USNO) master clock (how closely?) or is
a precision delta-time sufficient? What sample rate? What is your
budget? Does the device need to be UL/FCC/EC/etc. approved? One-off
benchtop for curiosity or to gather data for peer reviewed publication?

Numbers.

--
Rich Webb Norfolk, VA
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Watson A.Name - \"Watt Su
Guest
Posted: Sun Jul 24, 2005 11:54 pm    Post subject: Re: question: sensitive device to measure very small changes Reply with quote
"Rich Webb" <bbew.ar@mapson.nozirev.ten> wrote in message
news:7eo5e1t7gh7piupti16188ndbhnun0sjhq@4ax.com...
Quote:
On Sun, 24 Jul 2005 00:06:07 +0200, "Brother Numzi"
Numzi@hutmeil.comeon> wrote:

Hello

I am looking for some equipment that is _very_ sensitive and is
capable of
measuring _very_ small changes in electrical fields and magnetic
fields? The
device must be able to record the measurements real time.

What should I be looking for?

Small changes in large fields? Small changes in small fields? Both
electrical and magnetic fields, simultaneously, or would one or the
other be sufficient? What changes; intensity, polarization, direction,
or ...? Record to what precision? Record with what accuracy?
Calibrated
or just "as built?" Is it sufficient if the measurements are time
stamped and spooled to permanent media or must they be streamed?
Should
"real time" be synced to the UTC(USNO) master clock (how closely?) or
is
a precision delta-time sufficient? What sample rate? What is your
budget? Does the device need to be UL/FCC/EC/etc. approved? One-off
benchtop for curiosity or to gather data for peer reviewed
publication?

Numbers.

Rich, you need to make up a standard geek form for this kind of thing.
Like

Small changes in:
[ ] large fields
[ ] small fields
[ ] Both

[ ] magnetic field
[ ] electric field
[ ] simultaneous

Etc..

Don't forget to include your standard rates for customers. ;-)


Quote:
--
Rich Webb Norfolk, VA
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Rich Webb
Guest
Posted: Mon Jul 25, 2005 12:35 am    Post subject: Re: question: sensitive device to measure very small changes Reply with quote
On Sun, 24 Jul 2005 11:54:28 -0700, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

Quote:
Rich, you need to make up a standard geek form for this kind of thing.
Like

Small changes in:
[ ] large fields
[ ] small fields
[ ] Both

[ ] magnetic field
[ ] electric field
[ ] simultaneous

Etc..

Don't forget to include your standard rates for customers. ;-)

Hmmm... probably should inlude a discount for anybody that still
remembers (and uses) usenet. '-)

--
Rich Webb Norfolk, VA
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Keyser Soze
Guest
Posted: Mon Jul 25, 2005 12:35 am    Post subject: Re: question: sensitive device to measure very small changes Reply with quote
"Brother Numzi" <Numzi@hutmeil.comeon> wrote in message
news:42e2bf44$0$78285$157c6196@dreader1.cybercity.dk...
Quote:
Hello

I am looking for some equipment that is _very_ sensitive and is capable of
measuring _very_ small changes in electrical fields and magnetic fields?
The device must be able to record the measurements real time.

What should I be looking for?

Thanks :o)


I two wood like a sensitive peace of mesurment device that due these things.


Should have a frequency range from 0.01Hz to 453GHz +/- 0.004dB linearity.

Sensitivity for field strength needs to be at least 2.2femtoV/kM.
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