Brent,

Good idea.  I have used making tape to form a thick collar around the cable
insulation.  This takes time, but provides very repeatable measurements
(positioning).

I did this with a Fischer F-2000 probe, which has a small diameter hole.

Jim
________________________________________________________
Dr. Jim Knighten                e-mail: [email protected]
<mailto:[email protected]>  
Senior Consulting Engineer
NCR
17095 Via del Campo
San Diego, CA 92127             http://www.ncr.com <http://www.ncr.com>  
Tel: 858-485-2537
Fax: 858-485-3788

***** Notice the Area Code change from 619 *****


        -----Original Message-----
        From:   Brent DeWitt [SMTP:[email protected]]
        Sent:   Monday, June 21, 1999 12:48 PM
        To:     Lacey,Scott; 'Jim Eichner'
        Cc:     [email protected]
        Subject:        RE: Current probe problem


        Wrapping a strip of bubble pack around the cable a few time is also
an easy
        way to keep it centered in the clamp.

        Brent

        > -----Original Message-----
        > From: [email protected]
        > [mailto:[email protected]]On Behalf Of Lacey,Scott
        > Sent: Monday, June 21, 1999 11:47 AM
        > To: 'Jim Eichner'
        > Cc: '[email protected]'
        > Subject: RE: Current probe problem
        >
        >
        >
        > In my opinion, letting the cable insulation touch the probe body
        > is never a
        > good idea. I always try to "shim" the cable and probe in order to
        > center the
        > cable within the probe opening. The trick is to keep the shims
outside of
        > the probe. A good trick is to make a "V block" out of wood, with a
deeper
        > center notch for the probe body. This insures good radial and
axial
        > alignment (for consistency) and also prevents the probe body from
touching
        > the ground plane.
        > Scott


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