TDR instrument with regulable risetime.

[Elimoel A. Elias]

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[Resent] (originally sent 17/10/01)

Dear list members,

I am seeking a TDR  instrument with regulable risetime, covering a range as
large as possible.

Has anyone in this list ever used, or heard of, something like this?

I am familiar with a TDR instrument operating at a fast rise time, <200 pS.
I have also heard of instruments with
faster rise times, <10 pS.  I am seeking an instrument with a regulable
risetime, covering a range as
large as possible, perhaps from 10 to 200 pS.  But I have been unable to
find any information about this.
I have emailed some companies:
Soilmoisture
Campbell Scientific Inc.
Tektronix
E.S.I. Environmental Sensors Inc.
but I have only received negative answers.

I will be grateful for any information on this matter.

Elimoel A. Elias
e-mail: elias@imagenet.com.br
Website:  http://elimoel.freeyellow.com/elimoel.html
ICQ 109845414
Tel.: +55-19-432-9458