Re: TDR instrument with regulable risetime.

[M. G.]

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Telephone line technicians (the old-timers--not the kids...) can even use
an analog volt-ohm meter to detect shorts on long lines by guessing the
amount of inductance or capacitance from needle movement.  


The ideal TDR signal would be a step voltage change (infinitely fast rise
time) from a zero-impedance source.  Analysis of the reflection would
reveal every electromagnetic aspect of the media that carries the signal.
 The amplitude of the transmitted signal needs to be sufficiently great
to overcome attenuation along the signal path, returning with adequate
level so that measurements can be supported in the presence of system
noise.


Unless pulsing, recording and computing resources are severly limited, a
pulse sufficiently close to ideal should be used so that maximum
information can be derived from test data.  Once key reflection
properties have been identified, economics probably will dictate
limitations on resources for widespread application.


M. G.




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<excerpt>  I am seeking a TDR  instrument with regulable risetime,
covering a range

</excerpt>  as large as possible.





</excerpt>