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Subject:
From:
Joe Russeau <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joe Russeau <[log in to unmask]>
Date:
Fri, 30 Nov 2007 15:19:30 -0500
Content-Type:
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text/plain (270 lines)
Hello David,

Perhaps, I will investigate it further.  Thank you for the feedback.

Joe Russeau

----- Original Message ----- 
From: "David Greig" <[log in to unmask]>
To: "'TechNet E-Mail Forum'" <[log in to unmask]>; "'Joe Russeau'" 
<[log in to unmask]>
Sent: Friday, November 30, 2007 3:22 PM
Subject: RE: [TN] SV: [TN] SV: [TN] Low Noise Coaxial Cable Question


Hi Joe

You might be looking for PTFE / Teflon accelerometer cable, as used in 
vibration test environments. The PTFE is solid as opposed
to expanded (RF/microwave cables). Monitran, B&K and Sensitron are some 
manufacturers of accelerometers that will stock cable
assemblies, but I did used to get reels of the raw stuff about 20 years ago, 
can't remember from whom.


Best Regards

David Greig
______________________________
GigaDyne Ltd
5 Albany Business Centre
Gardeners Street
Dunfermline KY12 0RN
United Kingdom
t: +44 (0)1383 624 975
www.gigadyne.co.uk
______________________________

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Russeau
Sent: 30 November 2007 19:41
To: [log in to unmask]
Subject: Re: [TN] SV: [TN] SV: [TN] Low Noise Coaxial Cable Question

Doug,

You quote Joe just fine.  I should've been a little more detailed in my 
original posting.  I automatically assumed that it would
boil down to the materials making up low noise coaxial cable as opposed to 
standard coaxial cable. Silly me, I should have known
better. As always, I appreciate your inputs and those of the other TechNet 
Gurus.

Joe Russeau



----- Original Message -----
From: "Douglas O. Pauls" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, November 30, 2007 2:28 PM
Subject: Re: [TN] SV: [TN] SV: [TN] Low Noise Coaxial Cable Question


Obviously Joe quotes Joe better than I quote Joe.

So, yeah, what he said..........

Man, am I glad it is Friday.........

Doug Pauls




Joe Russeau <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
11/30/2007 01:22 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Joe Russeau <[log in to unmask]>


To
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Subject
Re: [TN] SV: [TN] SV: [TN] Low Noise Coaxial Cable Question






Hello Seth and Inge,

Seth thank you for that very educational response.

Basically, I am researching all of the different SIR test equipment
available.  I'm looking into purchasing a newer system (By-the way, this
is
not an invite to SIR equipment manufacturers to bombard me with product
literature). Anyway, one of the groups I have been speaking with
recommended
using their low noise coaxial cables. I asked how they classified the
cable
as low-noise. They responded that they pull the cable taught, drop a
weight
on it and measure the resulting charge.  If no charge, then it is
considered
low noise.  What I had hoped for with asking my question and the question
to
TechNet, was to find out what materials were best for low-noise coaxial
cables.  I have been contacting different cable manufacturers, who claim
to
have low-noise cable, to try and determine if the materials sets are
consistent from manufacturer to the next. I figured that would allow me to

find the cabling and perhaps make the cables myself.  What I have found is

that each cable manufacturer uses different materials for their low-noise
cable.  So, now I'm back to square one.  So perhaps I should ask the
question this way.  If you were in the process of measuring low currents,
as
is done in an SIR test, and you were looking into coaxial cables as the
transfer vehicle from the DUT to the measurement equipment, what materials

would you prefer in the cables to give the best data integrity?

Best Regards,

Joe Russeau


----- Original Message ----- 
From: "Hfjord" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, November 30, 2007 1:27 PM
Subject: [TN] SV: [TN] SV: [TN] Low Noise Coaxial Cable Question


Exellent! However, Joe has still not told us WHAT he wants to do with the
cable. I doubt he is on a level, that dielectric intrinsic noise will play
a
role. Few test engineers work with such problems. If he isn't a Nobel
Prize
aspirant of some kind. I suggest someone finds remedy against Tinnitus.
He/she will get the prize, I'm sure. And the inventor will create a lot of
noise...he-he
/Inge

-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Seth Goodman
Skickat: den 30 november 2007 18:55
Till: [log in to unmask]
Ämne: Re: [TN] SV: [TN] Low Noise Coaxial Cable Question

Joe,

Some of what has been mentioned is really part of other cable
specifications and has nothing to do with noise created in the cable
itself.  For instance, penetration of electromagnetic fields inside a
cable shield is often described by the manufacturer's specification for
shielding effectiveness.  To the extent that the cable has in imperfect
coaxial shield, it can convert ambient electric or magnetic fields into
a loop voltage or flowing current.  If external fields are the source of
your problem, you want cable with high shielding effectiveness as
opposed to low-noise cable.  For electric fields, improving the shield
means thicker braid, finer wire in the braid, better conductivity of
braid wire and plating, more than one braid and/or a foil shield.  For
magnetic fields, a shielded twisted pair may do better.

The traditional electronic noise sources, which are Johnson (thermal)
noise, shot noise and a group of unrelated mechanisms that produce 1/f
noise, do not produce appreciable noise in cables.  When cable
manufacturers list a cable as low-noise, they usually mean triboelectric
noise.  If the connected circuit puts a dc potential on the cable, then
mechanical flexing can change the capacitance between conductors, which
will cause current to flow in the external circuit.  The triboelectric
and capacitance change with motion can together be called microphonics,
as they are both motion-related.  Another source or noise in
high-voltage cables is leakage.

Regards,

Seth Goodman

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