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Hi Mark,<br>
<br>
Of course just detecting radiated noise is not good enough. We need
to know if the noise will affect the detector readout electronics.
Hard to know this except to test in-situ. Even if we see noise in
the electronics it may not come from the worst radiating device, as
who knows which frequencies are most effective in mucking up the
readout electronics. <br>
<br>
<br>
On 04/05/2012 04:47 PM, mark stevens wrote:
<blockquote cite="mid:4F7E04FE.2010000@jlab.org" type="cite">Hi
Elliott,
<br>
<br>
The spectrum analyzer with a hand-made antenna is all I have seen
used here at Jlab. I did a property search with the terms "emi"
and "noise" and saw nothing. I have previously used a portable
AM radio, tuned between stations, to pick up noise - it is
remarkably sensitive (it will pick up SCR noise, for example, like
that coming from light dimmers or switching power supplies).
There are commercial products that are "EMI Noise Analyzers", but
they are expensive. Some companies will rent them.
<br>
<br>
Best Regards,
<br>
<br>
Mark Stevens
<br>
<br>
On 4/5/2012 2:08 PM, Elliott Wolin wrote:
<br>
<blockquote type="cite">Hi,
<br>
<br>
Fernands says he currently has no good way to measure radiated
noise
<br>
other than jury-rigging something together using a piece of wire
and
<br>
some sort of spectrum analyzer. Does anyone know of real system
at JLab
<br>
that can measure radiated noise?
<br>
<br>
<br>
</blockquote>
<br>
<br>
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<br>
<pre class="moz-signature" cols="72">--
Sincerely,
Elliott
================================================================================
Those raised in a morally relative or neutral environment will hold
no truths to be self-evident.
Elliott Wolin
Staff Physicist, Jefferson Lab
12000 Jefferson Ave
Suite 8 MS 12A1
Newport News, VA 23606
757-269-7365
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